Since J. Carreras’ pioneer work on Hercynian fold belt of Pyreneas, it has been universally acknowledged that the sheath folds are one of the distinguished signs of ductile shearing zone in deep levels. Up to now, on...Since J. Carreras’ pioneer work on Hercynian fold belt of Pyreneas, it has been universally acknowledged that the sheath folds are one of the distinguished signs of ductile shearing zone in deep levels. Up to now, only in plutonic metamorphic rocks were the sheath folds found in the world. Recently, however, we展开更多
The sub-vertical meso-and micro-structures and fabrics developed in coesite-bearing foliated eclogites in the Taohang (桃行) area,southeastern Shandong (山东),China. The diagnostic structures and fabrics,including pen...The sub-vertical meso-and micro-structures and fabrics developed in coesite-bearing foliated eclogites in the Taohang (桃行) area,southeastern Shandong (山东),China. The diagnostic structures and fabrics,including penetrative foliation or mylonitic foliation containing mineral and stretching lineations,as well as sheath-like folds,appear to be the development of anastomosing UHP eclogite-facies shear belt arrays hosting massive eclogites. Textural relationships and mineral assem-blages indicate that the deformation of foliated eclogites developed closely after the formation of the massive eclogite,prior to the development of the granulite/amphibolite-facies symplectites and coronas,occurring over a very wide pressure range of (31-8)×102 MPa. It presents the structural records of the tectonometamorphic processes as being responsible for the earliest stages of exhumation of the UHP metamorphic rocks. Extensive regional field observations show that the meso-and micro-structures and fabrics recognized in the foliated eclogites at Taohang are remarkably similar or consistent in the whole Dabie (大别)-Sulu (苏鲁) UHP metamorphic belt. This article,thus,supports the idea that the earliest stages of exhumation of the UHP metamorphic rocks,from mantle depths to the Moho or the mantle-crust boundary layering,may be attributed mainly to a sub-vertical extrusion and ductile flow along the subduction channel,belonging to a syn-collision exhumation at about 235 to 220 Ma.展开更多
目的观察不同呼气末正压通气(PEEP)对腹膜后腹腔镜手术患者视神经鞘直径(ONSD)的影响。方法选择该院择期于全身麻醉下行腹膜后腹腔镜手术患者40例,采用随机数字表法分为2组:呼气末正压通气(PEEP)0 cm H_(2)O(C组)和PEEP 5 cm H_(2)O(P...目的观察不同呼气末正压通气(PEEP)对腹膜后腹腔镜手术患者视神经鞘直径(ONSD)的影响。方法选择该院择期于全身麻醉下行腹膜后腹腔镜手术患者40例,采用随机数字表法分为2组:呼气末正压通气(PEEP)0 cm H_(2)O(C组)和PEEP 5 cm H_(2)O(P组),每组20例。麻醉诱导后行机械通气,C组设置PEEP为0 cm H_(2)O,P组设置呼气末正压为5 cm H_(2)O。记录入室时(T_(0))、侧卧折刀位5 min(T_(1))、气腹后10 min(T_(2))、气腹后30 min(T_(3))、手术结束恢复体位后10 min(T_(4))5个时间点右眼ONSD;在各时间点行动脉血气分析并记录动脉血氧分压(PaO_(2))、二氧化碳分压(PaCO_(2)),通过动脉血气结果计算各时间点氧合指数(OI);记录T_(1)~T_(4)时气道峰压(Ppeak);记录患者术后7 d内恶心呕吐、眼痛、头痛、肺部并发症的发生情况。结果与T_(0)时比较,2组T_(2)、T_(3)时右眼ONSD明显增加(P<0.05);与T_(1)时比较,C组T_(3)、T_(4)时OI明显降低(P<0.05);与T_(1)时比较,2组T_(2)~T_(4)时PaCO_(2)明显升高(P<0.05);与T_(1)时比较,2组T_(2)、T_(3) Ppeak明显升高(P<0.05);与C组比较,P组T_(2)~T_(4)时OI明显升高,T_(2)、T_(3)时Ppeak明显升高(P<0.05)。2组患者术后7 d恶心呕吐、眼痛、头痛、肺部并发症等比较差异无统计学意义(P>0.05)。结论在腹膜后腹腔镜手术中,侧卧折刀位和应用PEEP 5 cm H_(2)O肺保护性通气策略可以改善患者氧合同时对患者ONSD无明显影响。展开更多
基金Project supported by the National Natural Science Foundation of China.
文摘Since J. Carreras’ pioneer work on Hercynian fold belt of Pyreneas, it has been universally acknowledged that the sheath folds are one of the distinguished signs of ductile shearing zone in deep levels. Up to now, only in plutonic metamorphic rocks were the sheath folds found in the world. Recently, however, we
基金supported by the National Natural Science Foundation of China (Nos. 40372094 and 49972067)
文摘The sub-vertical meso-and micro-structures and fabrics developed in coesite-bearing foliated eclogites in the Taohang (桃行) area,southeastern Shandong (山东),China. The diagnostic structures and fabrics,including penetrative foliation or mylonitic foliation containing mineral and stretching lineations,as well as sheath-like folds,appear to be the development of anastomosing UHP eclogite-facies shear belt arrays hosting massive eclogites. Textural relationships and mineral assem-blages indicate that the deformation of foliated eclogites developed closely after the formation of the massive eclogite,prior to the development of the granulite/amphibolite-facies symplectites and coronas,occurring over a very wide pressure range of (31-8)×102 MPa. It presents the structural records of the tectonometamorphic processes as being responsible for the earliest stages of exhumation of the UHP metamorphic rocks. Extensive regional field observations show that the meso-and micro-structures and fabrics recognized in the foliated eclogites at Taohang are remarkably similar or consistent in the whole Dabie (大别)-Sulu (苏鲁) UHP metamorphic belt. This article,thus,supports the idea that the earliest stages of exhumation of the UHP metamorphic rocks,from mantle depths to the Moho or the mantle-crust boundary layering,may be attributed mainly to a sub-vertical extrusion and ductile flow along the subduction channel,belonging to a syn-collision exhumation at about 235 to 220 Ma.
文摘目的观察不同呼气末正压通气(PEEP)对腹膜后腹腔镜手术患者视神经鞘直径(ONSD)的影响。方法选择该院择期于全身麻醉下行腹膜后腹腔镜手术患者40例,采用随机数字表法分为2组:呼气末正压通气(PEEP)0 cm H_(2)O(C组)和PEEP 5 cm H_(2)O(P组),每组20例。麻醉诱导后行机械通气,C组设置PEEP为0 cm H_(2)O,P组设置呼气末正压为5 cm H_(2)O。记录入室时(T_(0))、侧卧折刀位5 min(T_(1))、气腹后10 min(T_(2))、气腹后30 min(T_(3))、手术结束恢复体位后10 min(T_(4))5个时间点右眼ONSD;在各时间点行动脉血气分析并记录动脉血氧分压(PaO_(2))、二氧化碳分压(PaCO_(2)),通过动脉血气结果计算各时间点氧合指数(OI);记录T_(1)~T_(4)时气道峰压(Ppeak);记录患者术后7 d内恶心呕吐、眼痛、头痛、肺部并发症的发生情况。结果与T_(0)时比较,2组T_(2)、T_(3)时右眼ONSD明显增加(P<0.05);与T_(1)时比较,C组T_(3)、T_(4)时OI明显降低(P<0.05);与T_(1)时比较,2组T_(2)~T_(4)时PaCO_(2)明显升高(P<0.05);与T_(1)时比较,2组T_(2)、T_(3) Ppeak明显升高(P<0.05);与C组比较,P组T_(2)~T_(4)时OI明显升高,T_(2)、T_(3)时Ppeak明显升高(P<0.05)。2组患者术后7 d恶心呕吐、眼痛、头痛、肺部并发症等比较差异无统计学意义(P>0.05)。结论在腹膜后腹腔镜手术中,侧卧折刀位和应用PEEP 5 cm H_(2)O肺保护性通气策略可以改善患者氧合同时对患者ONSD无明显影响。
