《社区与心血管健康科学声明》由心血管病学专家、流行病学专家和预防医学专家组成的写作小组参与起草,并于2023年12月发表于美国心脏协会官方期刊Circulation:Cardiovascular Quality and Outcomes。该科学声明主要阐述如何利用社区对...《社区与心血管健康科学声明》由心血管病学专家、流行病学专家和预防医学专家组成的写作小组参与起草,并于2023年12月发表于美国心脏协会官方期刊Circulation:Cardiovascular Quality and Outcomes。该科学声明主要阐述如何利用社区对心血管疾病影响的现有知识,为制定和实施有效的干预措施提供路径图,在群体、卫生系统、社区和个人层面改善心血管健康,减轻心血管疾病负担。我国目前也面临着城乡之间、城市之间和乡村之间社区基础设施不均衡而带来的心血管健康不平等的问题。因此,对该科学声明进行解读,可在社区层面上为我国心血管疾病防治工作提供新的视角和思路,并建议将社区层面的干预措施纳入改善心血管健康的干预措施,以改善公众的心血管健康。展开更多
Magnetite, as a genetic indicator of ores, has been studied in various deposits in the world. In this paper, we present textural and compositional data of magnetite from the Qimantag metallogenic belt of the Kunlun Or...Magnetite, as a genetic indicator of ores, has been studied in various deposits in the world. In this paper, we present textural and compositional data of magnetite from the Qimantag metallogenic belt of the Kunlun Orogenic Belt in China, to provide a better understanding of the formation mechanism and genesis of the metallogenic belt and to shed light on analytical protocols for the in situ chemical analysis of magnetite. Magnetite samples from various occurrences, including the ore-related granitoid pluton, mineralised endoskarn and vein-type iron ores hosted in marine carbonate intruded by the pluton, were examined using scanning electron microscopy and analysed for major and trace elements using electron microprobe and laser ablation-inductively coupled plasma-mass spectrometry. The field and microscope observation reveals that early-stage magnetite from the Hutouya and Kendekeke deposits occurs as massive or banded assemblages, whereas late- stage magnetite is disseminated or scattered in the ores. Early-stage magnetite contains high contents of Ti, V, Ga, AI and low in Mg and Mn. In contrast, late-stage magnetite is high in Mg, Mn and low in Ti, V, Ga, AI. Most magnetite grains from the Qimantag metallogenic belt deposits except the Kendekeke deposit plot in the ＂ Skarn ＂ field in the Ca＋AI＋Mn vs Ti＋V diagram, far from typical magmatic Fe deposits such as the Damiao and Panzhihua deposits. According to the （MgO＋MnO）- TiO^-AI203 diagram, magnetite grains from the Kaerqueka and Galingge deposits and the No.7 ore body of the Hutouya deposit show typical characteristics of skarn magnetite, whereas magnetite grains from the Kendekeke deposit and the No.2 ore body of the Hutouya deposit show continuous elemental variation from magmatic type to skarn type. This compositional contrast indicates that chemical composition of magnetite is largely controlled by the compositions of magmatic fluids and host rocks of the ores that have reacted with the fluids. Moreover, a combination of petrography and magnetite geochemistry indicates that the formation of those ore deposits in the Qimantag metallogenic belt involved a magmatic-hydrothermal process.展开更多
文摘《社区与心血管健康科学声明》由心血管病学专家、流行病学专家和预防医学专家组成的写作小组参与起草,并于2023年12月发表于美国心脏协会官方期刊Circulation:Cardiovascular Quality and Outcomes。该科学声明主要阐述如何利用社区对心血管疾病影响的现有知识,为制定和实施有效的干预措施提供路径图,在群体、卫生系统、社区和个人层面改善心血管健康,减轻心血管疾病负担。我国目前也面临着城乡之间、城市之间和乡村之间社区基础设施不均衡而带来的心血管健康不平等的问题。因此,对该科学声明进行解读,可在社区层面上为我国心血管疾病防治工作提供新的视角和思路,并建议将社区层面的干预措施纳入改善心血管健康的干预措施,以改善公众的心血管健康。
基金supported by the Geological Survey Program of China Geological Survey (1212011121220)
文摘Magnetite, as a genetic indicator of ores, has been studied in various deposits in the world. In this paper, we present textural and compositional data of magnetite from the Qimantag metallogenic belt of the Kunlun Orogenic Belt in China, to provide a better understanding of the formation mechanism and genesis of the metallogenic belt and to shed light on analytical protocols for the in situ chemical analysis of magnetite. Magnetite samples from various occurrences, including the ore-related granitoid pluton, mineralised endoskarn and vein-type iron ores hosted in marine carbonate intruded by the pluton, were examined using scanning electron microscopy and analysed for major and trace elements using electron microprobe and laser ablation-inductively coupled plasma-mass spectrometry. The field and microscope observation reveals that early-stage magnetite from the Hutouya and Kendekeke deposits occurs as massive or banded assemblages, whereas late- stage magnetite is disseminated or scattered in the ores. Early-stage magnetite contains high contents of Ti, V, Ga, AI and low in Mg and Mn. In contrast, late-stage magnetite is high in Mg, Mn and low in Ti, V, Ga, AI. Most magnetite grains from the Qimantag metallogenic belt deposits except the Kendekeke deposit plot in the ＂ Skarn ＂ field in the Ca＋AI＋Mn vs Ti＋V diagram, far from typical magmatic Fe deposits such as the Damiao and Panzhihua deposits. According to the （MgO＋MnO）- TiO^-AI203 diagram, magnetite grains from the Kaerqueka and Galingge deposits and the No.7 ore body of the Hutouya deposit show typical characteristics of skarn magnetite, whereas magnetite grains from the Kendekeke deposit and the No.2 ore body of the Hutouya deposit show continuous elemental variation from magmatic type to skarn type. This compositional contrast indicates that chemical composition of magnetite is largely controlled by the compositions of magmatic fluids and host rocks of the ores that have reacted with the fluids. Moreover, a combination of petrography and magnetite geochemistry indicates that the formation of those ore deposits in the Qimantag metallogenic belt involved a magmatic-hydrothermal process.
