This paper report paleomagnetic data from late Cretaceous diorite dykes that sub-vertically intrude granodiorites in the eastern Gangdese belt near the city of Lhasa.Our research goals are to provide further constrain...This paper report paleomagnetic data from late Cretaceous diorite dykes that sub-vertically intrude granodiorites in the eastern Gangdese belt near the city of Lhasa.Our research goals are to provide further constraints on pre-collisional structure of the southern margin of Asia and the onset of the India-Asia collision.Magnetite is identified as the main magnetic carrier in our study.The magnetite shows no evidence of metamorphism or alteration as determined from optical and scanning electron microscope observations.A strong mineral orientation is revealed by anisotropy of magnetic susceptibility analysis both for the intruded dykes and the country rocks.The authors interpret this AMS fabric to have formed during intrusion rather than deformation.Fifteen of 23 sites yield acceptable site mean characteristic remanences with dual polarities.A scatter analysis of the virtual geomagnetic poles suggests that the mean result adequately averaged paleosecular variation.The paleomagnetic pole from the Gangdese dykes yields a paleolatitude of 14.3°N±5.8°N for the southern margin of Asia near Lhasa.The paleolatitude corresponds to an in-between position of the Lhasa terrane during about 130‒60 Ma.Furthermore,the mean declination of the characteristic remanent magnetization reveals a significant counterclockwise rotation of 18°±9°for the sampling location since about 83 Ma.In the light of tectonic setting of the dykes,the strike of the southern margin of Asia near Lhasa is restored to trend approximately about 310°,which is compatible with the hypothesis that the southern margin of Eurasia had a quasi-linear structure prior to its collision with India.展开更多
目的:介绍顺势疗法在南亚地区的发展现状,为我国学术界了解顺势疗法提供参考。方法:本文以History and Status of Homeopathy around the world《环球顺势疗法的历史和现状》为研究资料,从使用情况、教学情况、研究机构等方面,对顺势疗...目的:介绍顺势疗法在南亚地区的发展现状,为我国学术界了解顺势疗法提供参考。方法:本文以History and Status of Homeopathy around the world《环球顺势疗法的历史和现状》为研究资料,从使用情况、教学情况、研究机构等方面,对顺势疗法在南亚地区的发展进行介绍。结果:南亚地区对顺势疗法进行立法的国家有印度、巴基斯坦、孟加拉国、尼泊尔和斯里兰卡。而将顺势疗法纳入医保的只有印度和巴基斯坦。印度的顺势疗法教学机构有182所,巴基斯坦有72所,孟加拉国有23所,尼泊尔有1所。拥有单独的顺势疗法法规的国家有印度、尼泊尔、巴基斯坦;拥有顺势疗法协会的国家有印度、尼泊尔、巴基斯坦和斯里兰卡。印度对顺势疗法开展过研究。印度是南亚地区中顺势疗法发展最全面的国家,且印度各邦亦有顺势疗法的相关机构。结论:顺势疗法在南亚地区比较受欢迎,尤其是在印度和巴基斯坦,其中顺势疗法在印度的发展时间最长,体系较为完善。展开更多
This is a new report on the early Eocene radiolarian fauna from the Sangdanlin section in the Gyirong region, along the southern margin of the Yarlung Zangbo Suture Zone. The Sangdanlin section measured in this study ...This is a new report on the early Eocene radiolarian fauna from the Sangdanlin section in the Gyirong region, along the southern margin of the Yarlung Zangbo Suture Zone. The Sangdanlin section measured in this study is divided into three lithostratigraphic units from bottom to top： the Zongzhuo, Sangdanlin, and Zheya formations. Abundant radiolarian fossils were obtained from the Sangdanlin section and 54 species of 30 genera were identified and assigned as follows： Cryptamphorella conara-C. macropora the late Cretaceous Zone and Amphis_phaera coronate, Bur）ella tetradica-Bekoma campechensis, and B.bidartensis-B. divaricata the Paleocene-early Eocene Interval Zones. The Paleocene- early Eocene radiolarian zones are comparable to the radiolarian zones RP4-RP8 in New Zealand. Based on the data of radiolaria and lithofacies, it is suggested that the Zongzhuo Formation should be deposited along the base of the north-facing, continental slope of the Greater Indian continental margin, and the Sangdanlin Formation should be a deep marine, sedimentary sequence located in a foreland basin. The early Eocene radiolarian fauna in the Sangdanlin Formation constrains the initial age of the India-Asia collision to no later than 53.6 Ma.展开更多
基金financially supported by the National Science Foundation of China(92055205,41672223)the start-up funding from Sun Yat-sen University(74110-18841244).
文摘This paper report paleomagnetic data from late Cretaceous diorite dykes that sub-vertically intrude granodiorites in the eastern Gangdese belt near the city of Lhasa.Our research goals are to provide further constraints on pre-collisional structure of the southern margin of Asia and the onset of the India-Asia collision.Magnetite is identified as the main magnetic carrier in our study.The magnetite shows no evidence of metamorphism or alteration as determined from optical and scanning electron microscope observations.A strong mineral orientation is revealed by anisotropy of magnetic susceptibility analysis both for the intruded dykes and the country rocks.The authors interpret this AMS fabric to have formed during intrusion rather than deformation.Fifteen of 23 sites yield acceptable site mean characteristic remanences with dual polarities.A scatter analysis of the virtual geomagnetic poles suggests that the mean result adequately averaged paleosecular variation.The paleomagnetic pole from the Gangdese dykes yields a paleolatitude of 14.3°N±5.8°N for the southern margin of Asia near Lhasa.The paleolatitude corresponds to an in-between position of the Lhasa terrane during about 130‒60 Ma.Furthermore,the mean declination of the characteristic remanent magnetization reveals a significant counterclockwise rotation of 18°±9°for the sampling location since about 83 Ma.In the light of tectonic setting of the dykes,the strike of the southern margin of Asia near Lhasa is restored to trend approximately about 310°,which is compatible with the hypothesis that the southern margin of Eurasia had a quasi-linear structure prior to its collision with India.
文摘目的:介绍顺势疗法在南亚地区的发展现状,为我国学术界了解顺势疗法提供参考。方法:本文以History and Status of Homeopathy around the world《环球顺势疗法的历史和现状》为研究资料,从使用情况、教学情况、研究机构等方面,对顺势疗法在南亚地区的发展进行介绍。结果:南亚地区对顺势疗法进行立法的国家有印度、巴基斯坦、孟加拉国、尼泊尔和斯里兰卡。而将顺势疗法纳入医保的只有印度和巴基斯坦。印度的顺势疗法教学机构有182所,巴基斯坦有72所,孟加拉国有23所,尼泊尔有1所。拥有单独的顺势疗法法规的国家有印度、尼泊尔、巴基斯坦;拥有顺势疗法协会的国家有印度、尼泊尔、巴基斯坦和斯里兰卡。印度对顺势疗法开展过研究。印度是南亚地区中顺势疗法发展最全面的国家,且印度各邦亦有顺势疗法的相关机构。结论:顺势疗法在南亚地区比较受欢迎,尤其是在印度和巴基斯坦,其中顺势疗法在印度的发展时间最长,体系较为完善。
基金supported by the Strategic Project of Science and Technology of Chinese Academy of Sciences (XDB050105003)the State Scholarship Fund of China (41272030)+1 种基金the National Basic Research Program of China (2012CB822001)IGCP608
文摘This is a new report on the early Eocene radiolarian fauna from the Sangdanlin section in the Gyirong region, along the southern margin of the Yarlung Zangbo Suture Zone. The Sangdanlin section measured in this study is divided into three lithostratigraphic units from bottom to top： the Zongzhuo, Sangdanlin, and Zheya formations. Abundant radiolarian fossils were obtained from the Sangdanlin section and 54 species of 30 genera were identified and assigned as follows： Cryptamphorella conara-C. macropora the late Cretaceous Zone and Amphis_phaera coronate, Bur）ella tetradica-Bekoma campechensis, and B.bidartensis-B. divaricata the Paleocene-early Eocene Interval Zones. The Paleocene- early Eocene radiolarian zones are comparable to the radiolarian zones RP4-RP8 in New Zealand. Based on the data of radiolaria and lithofacies, it is suggested that the Zongzhuo Formation should be deposited along the base of the north-facing, continental slope of the Greater Indian continental margin, and the Sangdanlin Formation should be a deep marine, sedimentary sequence located in a foreland basin. The early Eocene radiolarian fauna in the Sangdanlin Formation constrains the initial age of the India-Asia collision to no later than 53.6 Ma.
