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标本溶血对血站血液筛查实验室ELISA检测结果的影响
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作者 秦倩倩 葛红卫 +3 位作者 张婧 赵子复 冷婵 王瑞 《中国输血杂志》 CAS 2024年第4期417-424,共8页
目的 分析标本溶血对血站实验室ELISA检测结果的影响,确定针对实验室试验项目及检测系统特异的可接受的溶血程度,为制定溶血标本接受标准提供依据。方法 针对HBsAg、HIV Ag/Ab、抗-HCV、抗-TP 4项ELISA试验,分别制备不同溶血梯度的阴性... 目的 分析标本溶血对血站实验室ELISA检测结果的影响,确定针对实验室试验项目及检测系统特异的可接受的溶血程度,为制定溶血标本接受标准提供依据。方法 针对HBsAg、HIV Ag/Ab、抗-HCV、抗-TP 4项ELISA试验,分别制备不同溶血梯度的阴性标本和弱阳性标本(S/CO≈2),使用几种常用的国产试剂对上述标本进行检测,分析不同程度溶血对各项目阴性和弱阳性标本检测结果的影响。结果 1)标本溶血对HBsAg、抗-HCV、抗-TP ELISA试验阴性和弱阳性标本的检测结果(反应性/非反应性)无影响;2)标本溶血对HIV Ag/Ab ELISA试验阴性和弱阳性标本的检测结果(反应性/非反应性)存在影响,建议将Hb 2 g/L作为HIV Ag/Ab ELISA试验可接受的溶血程度。结论 本研究确定了适用于本实验室相应试验项目和检测系统的溶血标本接受标准。溶血对血站实验室ELISA检测结果的影响与试剂、设备、环境等多种因素有关,实验室应结合自身具体情况进行评估和验证,科学合理地确定溶血标本接受标准。 展开更多
关键词 溶血 血站实验室 ELISA
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LA-MC-ICP-MS方解石U-Pb定年技术 被引量:2
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作者 谢博航 吴石头 +4 位作者 杨岳衡 王浩 赵子福 黄超 谢烈文 《岩石学报》 SCIE EI CAS CSCD 北大核心 2023年第1期236-248,共13页
方解石在成岩过程、生物作用、热液过程等多种地质环境中广泛形成,激光剥蚀电感耦合等离子体质谱(LA-ICP-MS)方解石U-Pb定年技术在解决关键地质问题中具有广阔的应用前景。方解石中U含量相对低(<5.0×10^(-6)),普通Pb占比高(238 ... 方解石在成岩过程、生物作用、热液过程等多种地质环境中广泛形成,激光剥蚀电感耦合等离子体质谱(LA-ICP-MS)方解石U-Pb定年技术在解决关键地质问题中具有广阔的应用前景。方解石中U含量相对低(<5.0×10^(-6)),普通Pb占比高(238 U/206 Pb<1),这对仪器灵敏度提出了高要求。相比于Q-ICP-MS和SF-ICP-MS,MC-ICP-MS具有同位素同时测定优势,分析精度更高。前人优化了仪器参数,对提高灵敏度进行了一些尝试,为了最大化的提高灵敏度,本研究基于Neptune Plus型号MC-ICP-MS,系统优化锥组合和辅助氮气,使得U和Pb元素灵敏度最优。研究表明采用Jet+X锥结合氮气增敏(N 2=4.0mL·min^(-1))条件下仪器灵敏度最高,相比于常规条件(S+H锥未结合氮气增敏),U和Pb的信号强度分别提高4倍和3倍。同时我们发现氮气增敏情况与锥组合有很大的关系,当采用X型号截取锥时,氮气的引入可以使得U的信号强度提高,而采用H型号截取锥时,氮气的引入并没有改变信号强度。基于优化后的仪器参数,本文建立了高空间分辨率(~85μm)LA-MC-ICP-MS方解石U-Pb定年方法。采用三个方解石U-Pb定年标准物质对方法进行了验证,所得结果与ID-TIMS定值结果在误差范围内一致,证明我们的方法对低U(~0.03×10^(-6))样品的分析是有效的。初步测定了两个实验室内部标准物质:TLM和LSJ07。一次测量TLM的结果为219.8±2.3Ma(2s,n=30),两次测量LSJ07的结果为26.4±0.2Ma(2s,n=30)和26.7±0.2Ma(2s,n=30)。这两个标准物质的普通铅占比相对较低,是潜在的方解石U-Pb定年标准物质。我们发现激光束斑大小的改变明显影响到结果的准确度,这可能与不同束斑下的分馏效应差异性有关,特别是当束斑小于60μm时。因此我们建议在进行方解石U-Pb定年时,标样和未知样品要严格匹配激光参数,最后初步讨论了方解石U-Pb体系的封闭情况。 展开更多
关键词 方解石U-Pb定年 LA-MC-ICP-MS 低U副矿物 高灵敏度 Jet采样锥
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氨甲基树脂固载手性双烯配体-铑催化剂的制备及催化不对称1,4加成反应的研究 被引量:1
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作者 师壮壮 赵子富 罗云飞 《化学世界》 CAS 2023年第6期425-430,共6页
从(R)-α-水芹烯和丙炔酸甲酯开始合成手性双烯配体,再与氨甲基(AM)树脂反应并络合铑得到固载铑的催化剂。用得到的固载催化剂进行一系列α,β不饱和酮与苯硼酸的不对称1,4加成反应。研究结果表明,合成的固载化催化剂参与的反应在温和... 从(R)-α-水芹烯和丙炔酸甲酯开始合成手性双烯配体,再与氨甲基(AM)树脂反应并络合铑得到固载铑的催化剂。用得到的固载催化剂进行一系列α,β不饱和酮与苯硼酸的不对称1,4加成反应。研究结果表明,合成的固载化催化剂参与的反应在温和的反应条件下产率为70%~80%,ee为70%~90%,而且合成的固载化铑催化剂具有很好的重复利用性。 展开更多
关键词 手性双烯配体 固载化铑催化剂 不对称1 4-加成反应
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沙棘籽粕多酚提取工艺优化、组分分析及抗氧化性能研究 被引量:9
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作者 孔宇 张倚菲 +6 位作者 韩鹏云 韦柳伊 李文华 王禹鹤 赵紫芙 李欣忆 李超 《中国油脂》 CAS CSCD 北大核心 2020年第4期109-114,共6页
为提高沙棘籽粕中蛋白质和多酚的利用率,在确保蛋白质溶出率低的情况下,优化了沙棘籽粕多酚的提取工艺条件。同时,采用HPLC对沙棘籽粕多酚提取液的组分进行了分析,并研究了沙棘籽粕多酚的抗氧化性。结果表明,沙棘籽粕多酚提取的最佳工... 为提高沙棘籽粕中蛋白质和多酚的利用率,在确保蛋白质溶出率低的情况下,优化了沙棘籽粕多酚的提取工艺条件。同时,采用HPLC对沙棘籽粕多酚提取液的组分进行了分析,并研究了沙棘籽粕多酚的抗氧化性。结果表明,沙棘籽粕多酚提取的最佳工艺条件为:80%甲醇溶液为提取溶剂,超声提取方式,超声频率40 kHz,超声功率150 W,料液比1∶25,提取温度20℃,提取时间20 min。在最佳提取条件下,多酚得率为(7.83±0.03)%。沙棘籽粕多酚提取液共检出没食子酸、儿茶素、芦丁、杨梅素、槲皮素、山奈酚6种多酚类物质,其中芦丁含量最高,为(1.623±0.224)mg/g(以沙棘籽粕质量计)。沙棘籽粕多酚具有较强的抗氧化性,对DPPH自由基和羟自由基均具有显著清除能力,半数抑制浓度(IC50)分别为0.057、0.147 mg/mL。 展开更多
关键词 沙棘籽粕 多酚 提取工艺 组分分析 抗氧化性
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山楂、麦芽及膳食纤维对维生素缺乏幼鼠肠道功能的影响 被引量:6
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作者 刘飞 郝婧宇 +4 位作者 赵子夫 司徒文佑 段素芳 霍贵成 哈惠 《食品科学》 EI CAS CSCD 北大核心 2022年第19期118-128,共11页
维生素类微量营养成分缺乏在儿童中普遍存在,针对此问题,本研究以断奶鼠为模型动物,评估在VB1、VB2、VB6和VA缺乏状态下,山楂和麦芽及其与膳食纤维复合对肠道功能的改善作用。结果显示,高剂量山楂和麦芽组、高剂量复合组都能够显著促进... 维生素类微量营养成分缺乏在儿童中普遍存在,针对此问题,本研究以断奶鼠为模型动物,评估在VB1、VB2、VB6和VA缺乏状态下,山楂和麦芽及其与膳食纤维复合对肠道功能的改善作用。结果显示,高剂量山楂和麦芽组、高剂量复合组都能够显著促进模型组小鼠的肠运动性。与正常对照组相比,维生素缺乏导致大鼠的体质量增量、摄食量和饲料利用率分别显著降低了34.29%、17.78%和19.24%(P<0.05),空肠和回肠的绒毛高度和隐窝深度比值分别显著降低了37.30%和36.79%(P<0.05),粪便中乙酸和总短链脂肪酸(short chain fatty acid,SCFA)含量分别显著降低了37.63%和43.87%(P<0.05)。与维生素缺乏模型组相比,高剂量山楂和麦芽组显著改善了维生素缺乏大鼠的摄食量和体质量增量,其中摄食量和体质量增量分别增加了7.84%和14.77%(P<0.05),低剂量复合组的食物利用率显著提高11.58%。与维生素缺乏模型组相比,高剂量山楂和麦芽组和低剂量复合组的空肠绒毛高度和隐窝深度的比值分别显著增加了52.65%和47.35%(P<0.05);高剂量山楂和麦芽组粪便中乙酸和总SCFA含量分别显著提高了46.86%和78.00%(P<0.05),低剂量复合组粪便中乙酸和总SCFA含量分别显著提高了43.74%和44.91%(P<0.05)。高剂量复合物组会使得肠道菌群中副拟杆菌过度生长,降低菌群多样性,引起菌群失调。高剂量山楂和麦芽组可调控维生素缺乏大鼠肠道菌群结构,增加乳杆菌属和阿克曼氏菌属的丰度。综上表明,高剂量山楂和麦芽组对大鼠肠道菌群具有一定的改善作用,低剂量复合组与高剂量山楂和麦芽组对肠道菌群的影响相似度较高,都能促进产SCFA特定菌属的生长,提高肠道SCFA含量,改善肠道组织形态,从而改善维生素缺乏大鼠肠道吸收功能,促进机体生长发育,实验结果可为功能食品的开发提供科学依据。 展开更多
关键词 山楂 麦芽 膳食纤维 维生素缺乏 肠道功能
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益生菌对断奶鼠消化酶活力、肠道运动性及粘膜形态的影响 被引量:8
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作者 刘飞 郝婧宇 +5 位作者 段素芳 司徒文佑 洪维鍊 刘伟贤 赵子夫 霍贵成 《食品工业科技》 CAS 北大核心 2021年第16期353-360,共8页
乳双歧杆菌、副干酪乳杆菌和植物乳杆菌是常见的益生菌,本研究系统评估了3株益生菌对断奶鼠消化代谢的调控作用。将断奶1周后的大鼠和小鼠分成对照组和益生菌处理组分别饲喂5周和4周,在此期间益生菌处理组每天分别灌胃1×10^(9) CF... 乳双歧杆菌、副干酪乳杆菌和植物乳杆菌是常见的益生菌,本研究系统评估了3株益生菌对断奶鼠消化代谢的调控作用。将断奶1周后的大鼠和小鼠分成对照组和益生菌处理组分别饲喂5周和4周,在此期间益生菌处理组每天分别灌胃1×10^(9) CFU的乳双歧杆菌、副干酪乳杆菌和植物乳杆菌。试验期末,小鼠用于肠运动性试验,全部大鼠剖检取样进行生化及组织学分析。结果表明,乳双歧杆菌、副干酪乳杆菌和植物乳杆菌都能够显著促进小鼠肠道的运动性。同对照组相比,灌胃乳双歧杆菌、植物乳杆菌能够显著(P<0.05)增加大鼠的全期体重增重和肠液中胰蛋白酶活力,其中体重增重分别增加了13.33%和8.52%,胰蛋白酶活力分别提高了28.76%和31.13%。3株益生菌对大鼠的胃蛋白酶和淀粉酶活力、肝脏、脾脏、肾脏和胰腺重量及脏器系数均无显著影响。副干酪乳杆菌、植物乳杆菌均能够显著(P<0.05)提高大鼠血清中总蛋白和球蛋白的含量,其中总蛋白含量分别增加了6.84%和9.12%,球蛋白含量分别增加了8.80%和6.82%。乳双歧杆菌、副干酪乳杆菌、植物乳杆菌生菌都会显著(P<0.05)升高大鼠血清中总胆固醇和高密度脂蛋白的含量,其中总胆固醇含量分别增加了44.35%、28.23%和17.74%,高密度脂蛋白含量分别增加了22.92%、27.08%和12.50%,对甘油三酯和低密度脂蛋白的含量无显著影响。此外,灌胃乳双歧杆菌、副干酪乳杆菌和植物乳杆菌均能够显著(P<0.05)提高大鼠的空肠和回肠绒毛高度和隐窝深度的比值以及回肠壁厚度,其中空肠绒毛高度和隐窝深度的比值分别增加了30.65%、19.35%和21.94%,回肠绒毛高度和隐窝深度的比值分别增加了30.21%、31.25%和35.94%,回肠壁厚度分别增加了21.14%、22.35%和27.51%。因此,乳双歧杆菌和植物乳杆菌能够通过促进肠道运动性、增加胰蛋白酶活力和改善肠道组织形态来促进宿主的消化吸收功能,进而提高宿主的体重增重同时又不会带来不良影响。 展开更多
关键词 乳双歧杆菌 植物乳杆菌 副干酪乳杆菌副干酪亚种 消化吸收 断奶鼠
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多模态超声检查技术在布鲁菌性附睾睾丸炎中的研究进展 被引量:1
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作者 赵梓孚 王欣 +3 位作者 乔春梅 张红 陈启 王晓磊 《影像研究与医学应用》 2022年第19期7-9,共3页
布鲁菌性附睾睾丸炎是布鲁氏杆菌感染累及男性附睾和(或)睾丸所致,病程长,复发率高,在患病后可对男性生理及心理产生短期或长期不良影响。因此,早期发现、正确诊断和及时治疗是提高BEPO治愈率、减少并发症的关键。近年来,超声技术已经... 布鲁菌性附睾睾丸炎是布鲁氏杆菌感染累及男性附睾和(或)睾丸所致,病程长,复发率高,在患病后可对男性生理及心理产生短期或长期不良影响。因此,早期发现、正确诊断和及时治疗是提高BEPO治愈率、减少并发症的关键。近年来,超声技术已经从传统的灰阶超声、彩色多普勒超声发展到与超声造影、弹性成像为一体的多模态超声诊治,常规超声及超声新技术对于辅助临床诊断与鉴别诊断布鲁菌性附睾睾丸炎具有十分重要的意义。本文就常见的超声检查技术在布鲁菌性附睾睾丸炎中的相关研究进行综述。 展开更多
关键词 布鲁菌性附睾睾丸炎 超声检查 弹性成像 超声造影
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发酵乳杆菌CECT5716计数方法比较
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作者 曹春杰 王淑晨 +3 位作者 赵紫芙 于景华 田慧青 陈铁涛 《中国乳品工业》 CAS 北大核心 2020年第2期46-48,共3页
针对中外乳酸菌菌落数检测标准的差异,从固体菌粉的溶解情况以及培养基成分入手,通过比对菌落生长情况找出问题所在并提出可行性改进意见。结果表明,两种标准中所用混匀方式对菌落计数无影响;冷冻保藏的固体菌粉在后续实验操作前37℃下... 针对中外乳酸菌菌落数检测标准的差异,从固体菌粉的溶解情况以及培养基成分入手,通过比对菌落生长情况找出问题所在并提出可行性改进意见。结果表明,两种标准中所用混匀方式对菌落计数无影响;冷冻保藏的固体菌粉在后续实验操作前37℃下复溶45 min能够提高其活力,是造成中外差异的因素之一;复溶时用1%缓冲蛋白胨水进行溶解对缩短中外标准菌落数检测结果有积极作用;在培养基中加入适量营养物质能够显著提升菌落生长数量。 展开更多
关键词 发酵乳杆菌CECT5716 MRS培养基 菌落数
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多模态超声技术在布鲁菌病中的应用价值
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作者 常芳媛 赵梓孚 +3 位作者 乔春梅 陈启 尚智鑫 王晓磊 《中华临床医师杂志(电子版)》 CAS 2024年第3期319-322,共4页
布鲁菌病是由布鲁杆菌引起的人畜共患病,其中以羊布鲁菌病属最为常见,多发生于牧区。布鲁菌病临床表现多样,以骨关节受累最为多见,也可侵犯循环,消化,生殖,泌尿,呼吸等多个系统,临床多表现为发热、多汗、骨关节痛、体重减轻、肝、脾、... 布鲁菌病是由布鲁杆菌引起的人畜共患病,其中以羊布鲁菌病属最为常见,多发生于牧区。布鲁菌病临床表现多样,以骨关节受累最为多见,也可侵犯循环,消化,生殖,泌尿,呼吸等多个系统,临床多表现为发热、多汗、骨关节痛、体重减轻、肝、脾、淋巴结肿大等非特异性症状,及时发现布鲁菌病及其并发症对病人的治疗和预后具有重要意义。近年来,超声技术不断发展,除了传统的灰阶超声和多普勒超声,超声造影,超声介入,超微血流成像以及超声弹性成像等新技术也有重大发展,在布鲁菌病的诊断以及临床评估布鲁菌病的疗效中具有很大意义。 展开更多
关键词 多模态超声技术 布鲁菌病关节炎 布鲁菌病睾丸炎 布鲁菌病心内膜炎
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大陆板片-地幔相互作用:来自大别造山带碰撞后安山质火山岩的地球化学证据 被引量:4
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作者 赵子福 代富强 陈启 《地球科学》 EI CAS CSCD 北大核心 2019年第12期4119-4127,共9页
俯冲到地幔深度的地壳物质不可避免地在板片-地幔界面与地幔楔发生相互作用,由此形成的超镁铁质交代岩就是造山带镁铁质火成岩的地幔源区.因此,造山带镁铁质火成岩为研究俯冲地壳物质再循环和壳-幔相互作用提供了重要研究对象.为了揭示... 俯冲到地幔深度的地壳物质不可避免地在板片-地幔界面与地幔楔发生相互作用,由此形成的超镁铁质交代岩就是造山带镁铁质火成岩的地幔源区.因此,造山带镁铁质火成岩为研究俯冲地壳物质再循环和壳-幔相互作用提供了重要研究对象.为了揭示俯冲陆壳物质再循环的机制和过程,对大别造山带碰撞后安山质火山岩开展了元素和同位素地球化学研究.这些安山质火山岩的SIMS锆石U-Pb年龄为124±3~130±2 Ma,表明其形成于早白垩世.此外,残留锆石的U-Pb年龄为中新元古代和三叠纪,分别对应于大别-苏鲁造山带超高压变火成岩的原岩年龄和变质年龄.它们具有岛弧型微量元素特征、富集的Sr-Nd-Hf同位素组成,以及变化的且大多不同于正常地幔的锆石δ^18O值.这些元素和同位素特征指示,这些安山质火山岩是交代富集的造山带岩石圈地幔部分熔融的产物.在三叠纪华南陆块俯冲于华北陆块之下的过程中,俯冲华南陆壳来源的长英质熔体交代了上覆华北岩石圈地幔楔橄榄岩,大陆俯冲隧道内的熔体-橄榄岩反应产生了富沃、富集的镁铁质地幔交代岩.这种地幔交代岩在早白垩世发生部分熔融,就形成了所观察到的安山质火山岩.因此,碰撞造山带镁铁质岩浆岩的地幔源区是通过大陆俯冲隧道内板片-地幔相互作用形成的,而加入地幔楔中长英质熔体的比例决定了这些镁铁质岩浆岩的岩石化学和地球化学成分. 展开更多
关键词 安山岩 碰撞造山带 板片一地幔相互作用 熔体一橄榄岩反应 俯冲隧道 地球化学.
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Remelting of subducted continental lithosphere: Petrogenesis of Mesozoic magmatic rocks in the Dabie-Sulu orogenic belt 被引量:65
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作者 zhao zifu ZHENG YongFei 《Science China Earth Sciences》 SCIE EI CAS 2009年第9期1295-1318,共24页
The Dabie-Sulu orogenic belt was formed by the Triassic continental collision between the South China Block and the North China Block. There is a large area of Mesozoic magmatic rocks along this orogenic belt, with em... The Dabie-Sulu orogenic belt was formed by the Triassic continental collision between the South China Block and the North China Block. There is a large area of Mesozoic magmatic rocks along this orogenic belt, with emplacement ages mainly at Late Triassic, Late Jurassic and Early Cretaceous. The Late Triassic alkaline rocks and the Late Jurassic granitoids only crop out in the eastern part of the Sulu orogen, whereas the Early Cretaceous magmatic rocks occur as massive granitoids, sporadic intermedi- ate-mafic intrusive and volcanic rocks throughout the Dabie-Sulu orogenic belt. Despite the different ages for their emplacement, the Mesozoic magmatic rocks are all characterized not only by enrichment of LREE and LILE but depletion of HFSE, but also by high initial Sr isotope ratios, low εNd(t) values and low radiogeneic Pb isotope compositions. Some zircons from the Jurassic and Cretaceous granitoids contain inherited magmatic cores with Neoprotozoic and Triassic U-Pb ages. Most of the Cretaceous mafic rocks have zircon δ18O values and whole-rock δ13C values lower than those for the normal mantle. A systematic comparison with adjacent UHP metaigneous rocks shows that the Mesozoic granitoids and mafic rocks have elemental and isotopic features similar to the UHP metagranite and metabasite, respectively. This indicates that these magmatic and metamorphic rocks share the diagnostic features of lithospheric source that has tectonic affinity to the northern edge of the South China Block. Their precursors underwent the UHP metamorphism and the post-collisional anatexis, respectively at different times and depths. Therefore, the Mesozoic magmatic rocks were derived from anatexis of the subducted continental lithosphere itself beneath the collision-thickened orogen; the geodynamic mechanism of the post-collisional magmatisms is tectonic collapse of orogenic roots in response to lithospheric extension. 展开更多
关键词 continental subduction LITHOSPHERE ANATEXIS POST-COLLISIONAL magmatism MESOZOIC tectonics UHP metamorphic rocks DABIE-SULU
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Continental subduction channel processes: Plate interface interaction during continental collision 被引量:58
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作者 ZHENG YongFei zhao zifu CHEN YiXiang 《Chinese Science Bulletin》 SCIE EI CAS 2013年第35期4371-4377,共7页
The study of subduction-zone processes is a key to development of the plate tectonic theory.Plate interface interaction is a basic mechanism for the mass and energy exchange between Earth’s surface and interior.By de... The study of subduction-zone processes is a key to development of the plate tectonic theory.Plate interface interaction is a basic mechanism for the mass and energy exchange between Earth’s surface and interior.By developing the subduction channel model into continental collision orogens,insights are provided into tectonic processes during continental subduction and its products.The continental crust,composed of felsic to mafic rocks,is detached at different depths from subducting continental lithosphere and then migrates into continental subduction channel.Part of the subcontinental lithospheric mantle wedge,composed of peridotite,is offscrapped from its bottom.The crustal and mantle fragments of different sizes are transported downwards and upwards inside subduction channels by the corner flow,resulting in varying extents of metamorphism,with heterogeneous deformation and local anatexis.All these metamorphic rocks can be viewed as tectonic melanges due to mechanical mixing of crust-and mantle-derived rocks in the subduction channels,resulting in different types of metamorphic rocks now exposed in the same orogens.The crust-mantle interaction in the continental subduction channel is realized by reaction of the overlying ancient subcontinental lithospheric mantle wedge peridotite with aqueous fluid and hydrous melt derived from partial melting of subducted continental basement granite and cover sediment.The nature of premetamorphic protoliths dictates the type of collisional orogens,the size of ultrahigh-pressure metamorphic terranes and the duration of ultrahigh-pressure metamorphism. 展开更多
关键词 大陆俯冲 碰撞过程 界面 中板 大陆碰撞造山带 大陆岩石圈 板块构造理论 壳幔相互作用
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Developing plate tectonics theory from oceanic subduction zones to collisional orogens 被引量:89
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作者 ZHENG YongFei CHEN YiXiang +1 位作者 DAI LiQun zhao zifu 《Science China Earth Sciences》 SCIE EI CAS CSCD 2015年第7期1045-1069,共25页
Crustal subduction and continental collision is the core of plate tectonics theory. Understanding the formation and evolution of continental collision orogens is a key to develop the theory of plate tectonics. Differe... Crustal subduction and continental collision is the core of plate tectonics theory. Understanding the formation and evolution of continental collision orogens is a key to develop the theory of plate tectonics. Different types of subduction zones have been categorized based on the nature of subducted crust. Two types of collisional orogens, i.e. arc-continent and continent-continent collisional orogens, have been recognized based on the nature of collisional blocks and the composition of derivative rocks. Arc-continent collisional orogens contain both ancient and juvenile crustal rocks, and reworking of those rocks at the post-collisional stage generates magmatic rocks with different geochemical compositions. If an orogen is built by collision between two relatively old continental blocks, post-collisional magmatic rocks are only derived from reworking of the old crustal rocks. Collisional orogens undergo reactivation and reworking at action of lithosphere extension, with inheritance not only in the tectonic regime but also in the geochemical compositions of reworked products(i.e., magmatic rocks). In order to unravel basic principles for the evolution of continental tectonics at the post-collisional stages, it is necessary to investigate the reworking of orogenic belts in the post-collisional regime, to recognize physicochemical differences in deep continental collision zones, and to understand petrogenetic links between the nature of subducted crust and post-collisional magmatic rocks. Afterwards we are in a position to build the systematics of continental tectonics and thus to develop the plate tectonics theory. 展开更多
关键词 crustal subduction continental collision postcollisional reworking MAGMATISM METAMORPHISM continental tectonics
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Two types of the crust-mantle interaction in continental subduction zones 被引量:19
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作者 zhao zifu DAI LiQun ZHENG YongFei 《Science China Earth Sciences》 SCIE EI CAS CSCD 2015年第8期1269-1283,共15页
Plate subduction is an important mechanism for exchanging the mass and energy between the mantle and the crust,and the igneous rocks in subduction zones are the important carriers for studying the recycling of crustal... Plate subduction is an important mechanism for exchanging the mass and energy between the mantle and the crust,and the igneous rocks in subduction zones are the important carriers for studying the recycling of crustal materials and the crust-mantle interaction.This study presents a review of geochronology and geochemistry for postcollisional mafic igneous rocks from the Hong’an-Dabie-Sulu orogens and the southeastern edge of the North China Block.The available results indicate two types of the crust-mantle interaction in the continental subduction zone,which are represented by two types of mafic igneous rocks with distinct geochemical compositions.The first type of rocks exhibit arc-like trace element distribution patterns(i.e.enrichment of LILE,LREE and Pb,but depletion of HFSE)and enriched radiogenic Sr-Nd isotope compositions,whereas the second type of rocks show OIB-like trace element distribution patterns(i.e.enrichment of LILE and LREE,but no depletion of HFSE)and depleted radiogenic Sr-Nd isotope compositions.Both of them have variable zircon O isotope compositions,which are different from those of the normal mantle zircon,and contain residual crustal zircons.These geochemical features indicate that the two types of mafic igneous rocks were originated from the different natures of mantle sources.The mantle source for the second type of rocks would be generated by reaction of the overlying juvenile lithospheric mantle with felsic melts originated from previously subducted oceanic crust,whereas the mantle source for the first type of rocks would be generated by reaction of the overlying ancient lithospheric mantle of the North China Block with felsic melts from subsequently subducted continental crust of the South China Block.Therefore,there exist two types of the crust-mantle interaction in the continental subduction zone,and the postcollisional mafic igneous rocks provide petrological and geochemical records of the slab-mantle interactions in continental collision orogens. 展开更多
关键词 GEOCHEMISTRY postcollisional mafic igneous rocks crust-mantle interaction continental subduction zone
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In situ U-Pb dating of xenotime by laser ablation (LA)-ICP-MS 被引量:8
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作者 LIU ZhiChao WU FuYuan +3 位作者 GUO ChunLi zhao zifu YANG JinHui SUN JinFeng 《Chinese Science Bulletin》 SCIE EI CAS 2011年第27期2948-2956,共9页
Xenotime is an ideal mineral for U-Th-Pb isotopic dating because of its relatively high U and Th contents, but typically low concentration of common Pb. These characteristics, and the fact that it is widespread throug... Xenotime is an ideal mineral for U-Th-Pb isotopic dating because of its relatively high U and Th contents, but typically low concentration of common Pb. These characteristics, and the fact that it is widespread throughout various types of rocks, suggest that the U-Th-Pb dating of xenotime has broad applications. Studies of U-Pb dating on xenotime by ion microprobe (such as SHRIMP) have increased in recent years, whereas studies by laser ablation (LA)-ICP-MS are still rare. In this study, we developed a technique for U-Pb dating of xenotime using the 193 nm ArF laser-ablation system and Agilent 7500a Q-ICP-MS. To evaluate the reliability of our method, a xenotime standard, BS-1, was analyzed and calibrated against another xenotime standard, MG-1. The weighted mean 206 Pb/ 238 U ages of 510.1 ± 5.2 Ma (2 n = 21), 509.8 ± 4.3 Ma (2 n = 21) and 510.0 ± 4.6 Ma (2 n = 21) were obtained using beam diameters of 16, 24 and 32 m, respectively. These ages are identical to those determined by ID-TIMS method (weighted mean 206 Pb/ 238 U age of 508.8 ± 1.4 Ma), which supports the reliability of our LA-ICP-MS method. We also analyzed xenotimes in leucogranites from South Tibet and granites from Xihuashan in southern China, and obtained accurate and precise ages. Nevertheless, we observed systematic differences in Pb/U fractionation among xenotime, monazite and zircon. The matrix-effect resulted in either under-correction or over-correction of fractionation, and thus led to inaccurate ages. Thus, a matrix-matched material is required for U-Pb dating of xenotime by LA-ICP-MS. 展开更多
关键词 PB同位素 激光烧蚀 磷钇矿 ICP MS法 年龄 LA 原位
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Oxygen isotope evidence for two-stage water-rock interactions of the Nianzishan A-type granite in NE China 被引量:7
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作者 WEI Chunsheng ZHENG Yongfei +1 位作者 zhao zifu J.W.Valley 《Chinese Science Bulletin》 SCIE EI CAS 2001年第9期727-731,共5页
The oxygen isotope ratios of whole-rock, common rock-forming minerals and zircon from Mesozoic A-type granitic pluton at Nianzishan in northeastern China were analyzed by the conventional BrF5 method and the laser-pro... The oxygen isotope ratios of whole-rock, common rock-forming minerals and zircon from Mesozoic A-type granitic pluton at Nianzishan in northeastern China were analyzed by the conventional BrF5 method and the laser-probe technique, respectively. Both whole-rock and rock-forming minerals show large δ18O variations up to 5.5‰ with significant oxygen isotope disequilibrium between zircon and the other minerals, whereas the δ18O values of zircon are tightly clustered between 3.12‰ and 4.19‰ and thus lower than the normal-mantle δ18O values. These results indicate that the Nianzishan A-type granite experienced two-stage water-rock interactions subsequentially. The remarkably low zircon δ18O values are genetically due to sea-water exchange with granite protolith in the first stage, and the oxygen isotope disequilibrium fractionations between zircon and rock-forming minerals are caused by mete-oric-hydrothermal alteration in the second stage. It is inferred that the 18O-depleted A-type granitic magma 展开更多
关键词 A-TYPE granite water-rock interaction ZIRCON oxygen ISOTOPES GEOCHEMICAL recycling.
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一种枳椇子、葛根、益生菌配方产品醒酒及肝损伤保护作用研究 被引量:10
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作者 陈醇 郝靖宇 +5 位作者 冯昊天 魏九玲 陈希民 冷候喜 赵子夫 何剑 《食品科技》 CAS 北大核心 2020年第2期91-97,共7页
目的:探讨一种枳椇子、葛根、牛磺酸、酵母、益生菌解酒配方产品的醒酒及肝损伤保护作用。方法:采用酒精灌胃法建立急性酒精中毒模型,采集大鼠血液检测乙醇含量,观察小鼠醉酒行为学指标;建立酒精性肝损伤模型,采集小鼠肝脏检测还原型谷... 目的:探讨一种枳椇子、葛根、牛磺酸、酵母、益生菌解酒配方产品的醒酒及肝损伤保护作用。方法:采用酒精灌胃法建立急性酒精中毒模型,采集大鼠血液检测乙醇含量,观察小鼠醉酒行为学指标;建立酒精性肝损伤模型,采集小鼠肝脏检测还原型谷胱甘肽(Glutathione reduced,GSH)、丙二醛(Malondialdehyde,MDA)、甘油三酯(Triglyceride,TG)水平。结果:与模型对照组相比,各剂量实验组大鼠血液乙醇含量及血液乙醇曲线下面积(AUC)较低。各剂量实验组小鼠醉酒时间平均值分别缩短了46.10%、30.89%和28.83%,低剂量和高剂量组差异显著,且差异有统计学意义(P<0.05)。与模型对照组小鼠相比,各剂量实验组小鼠醒酒时间平均值分别缩短了28.02%、13.26%和19.57%,其中低剂量组和高剂量组缩短明显且差异有统计学意义(P<0.05)。低剂量实验组和高剂量实验组小鼠肝组织匀浆中MDA含量明显低于模型对照组(P<0.05),各剂量组TG含量、GSH含量明显高于模型对照组(P<0.05)。结论:解酒配方具有短时速效解酒功能,长期食用可预防酒精性肝损伤作用。 展开更多
关键词 枳椇子 葛根 牛磺酸 酵母 益生菌 乙醇浓度 解酒 酒精性肝损伤
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SHRIMP zircon U-Pb dating for two episodes of migmatization in the Dabie orogen 被引量:5
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作者 WU YuanBao TANG Jun +1 位作者 ZHANG ShaoBing zhao zifu 《Chinese Science Bulletin》 SCIE EI CAS 2007年第13期1836-1842,共7页
Zircon CL imaging and SHRIMP U-Pb dating were carried out for migmatite in the Dabie orogen. Zircons from the Manshuihe migmatite show clear core-rim structures. The cores display sector or weak zoning and low Th/U ra... Zircon CL imaging and SHRIMP U-Pb dating were carried out for migmatite in the Dabie orogen. Zircons from the Manshuihe migmatite show clear core-rim structures. The cores display sector or weak zoning and low Th/U ratios of 0.01 to 0.17, indicating their precipitation from metamorphic fluid. They yield a weighted mean age of 137±5 Ma. By contrast, the rims exhibit planar or nebulous zoning with relatively high Th/U ratios of 0.35 to 0.69, suggesting their growth from metamorphic melt. They give a weighted mean age of 124±2 Ma. Zircons from the Fenghuangguan migmatite also display core-rim structures. The cores are weakly oscillatory zoned or unzoned with high Th/U ratios of 0.21 to 3.03, representing inherited zircons of magmatic origin that experienced different degrees of solid-state recrystallization. SHRIMP U-Pb analyses obtain that its protolith was emplaced at 768±12 Ma, consistent with middle Neoproterozoic ages for protoliths of most UHP metaigneous rocks in the Dabie-Sulu orogenic belt. By contrast, the rims do not show significant zoning and have very low Th/U ratios of 0.01 to 0.09, typical of zircon crystallized from metamorphic fluid. They yield a weighted 206Pb/238U age of 137±4 Ma. Taking the two case dates together, it appears that there are two episodes of zircon growth and thus migmati-tization at 137±2 Ma and 124±2 Ma, respectively, due to metamorphic dehydration and partial melting. The appearance of metamorphic dehydration corresponds to the beginning of tectonic extension thus to the tectonic switch from crustal compression to extension in the Dabie orogen. On the other hand, the partial melting is responsible for the extensional climax, resulting in formation of coeval migmatite, granitoid and granulite. They share the common protolith, the collision-thickened continental crust of mid-Neoproterozoic ages. 展开更多
关键词 混合岩 锆石 脱水处理 溶解作用
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The water content and hydrogen isotope composition of continental lithospheric mantle and mantle-derived mafic igneous rocks in eastern China 被引量:1
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作者 XU Zheng GONG Bin zhao zifu 《Science China Earth Sciences》 SCIE EI CAS CSCD 2016年第5期910-926,共17页
The water contents of minerals and whole-rock in mantle-derived xenoliths from eastern China exhibit large variations and are generally lower than those from other on- and off-craton lithotectonic units. Nevertheless,... The water contents of minerals and whole-rock in mantle-derived xenoliths from eastern China exhibit large variations and are generally lower than those from other on- and off-craton lithotectonic units. Nevertheless, the water contents of mineral and whole-rock in Junan peridotite xenoliths, which sourced from the juvenile lithospheric mantle, are generally higher than those elsewhere in eastern China. This suggests that the initial water content of juvenile lithospheric mantle is not low. There is no obvious correlation between the water contents and Mg~# values of minerals in the mantle xenoliths and no occurrence of diffusion profile in pyroxene, suggesting no relationship between the low water content of mantle xenolith and the diffusion loss of water during xenolith ascent with host basaltic magmas. If the subcontinental lithospheric mantle(SCLM) base is heated by the asthenospheric mantle, the diffusion loss of water is expected to occur. On the other hand, extraction of basaltic melts from the SCLM is a more efficient mechanism to reduce the water content of xenoliths. The primary melts of Mesozoic and Cenozoic basalts in eastern China have water contents, as calculated from the water contents of phenocrysts, higher than those of normal mid-ocean ridge basalts(MORB). The Mesozoic basalts exhibit similar water contents to those of island arc basalts, whereas the Cenozoic basalts exhibit comparable water contents to oceanic island basalts and backarc basin basalts with some of them resembling island arc basalts. These observations suggest the water enrichment in the mantle source of continental basalts due to metasomatism by aqueous fluids and hydrous melts derived from dehydration and melting of deeply subducted crust. Mantle-derived megacrysts, minerals in xenoliths and phenocrysts in basalts from eastern China also exhibit largely variable hydrogen isotope compositions, indicating a large isotopic heterogeneity for the Cenozoic SCLM in eastern China. The water content that is higher than that of depleted MORB mantle and the hydrogen isotope composition that is deviated from that of depleted MORB mantle suggest that the Cenozoic continental lithospheric mantle suffered the metasomatism by hydrous melts derived from partial melting of the subducted Pacific slab below eastern China continent. The metasomatism would lead to the increase of water content in the SCLM base and then to the decrease of its viscosity. As a consequence, the SCLM base would be weakened and thus susceptible to tectonic erosion and delamination. As such, the crust-mantle interaction in oceanic subduction channel is the major cause for thinning of the craton lithosphere in North China. 展开更多
关键词 Eastern China Continental basalt Lithospheric mantle Water Hydrogen isotope
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