Lead and zinc resources are abundant in China, with the reserves of 100 million tons ranking only second in the world. There are more than 3000 lead-zinc mine areas nationwide. The classification of lead-zinc （Pb-Zn...Lead and zinc resources are abundant in China, with the reserves of 100 million tons ranking only second in the world. There are more than 3000 lead-zinc mine areas nationwide. The classification of lead-zinc （Pb-Zn） deposits has been a highly controversial issue. From the standpoint of evaluating the potential of mineral resources, we construct a Pb-Zn deposit predictive type of classification scheme, and propose a Pb-Zn deposit comprehensive classification scheme （including 5 classes and 13 sub-types） that regards mineralization as the primary factor and the ore rock as secondary. According to the temporal and spatial distribution of Pb-Zn deposits, we conclude that a multi-period, multi-cycle orogenic environment is the most favorable for lead-zinc deposit growth, that the Proterozoic is the major eon for the growth of igneous-type deposits, the Paleozoic is an important development era for sedimentary Pb-Zn deposits, and the Mesozoic and Cenozoic are the heyday eras of magmatic type lead-zinc deposits. On this basis, we analyse the relationship between tectonic evolution and Pb-Zn metallogenic, and propose that the key factors determining geological mineralization are the metallogenic epoch of mineralization and tectonic environment, which determine the temporal and spatial distribution.展开更多
Objective Located near the intersection of Yangtze craton, Tibet- Sanjiang orogen and Songpan-Ganzi orogen of Northwest Yunnan Province, the Mahuaping deposit is a unique large -scale tungsten-beryllium-fluorite ore ...Objective Located near the intersection of Yangtze craton, Tibet- Sanjiang orogen and Songpan-Ganzi orogen of Northwest Yunnan Province, the Mahuaping deposit is a unique large -scale tungsten-beryllium-fluorite ore deposit ever discovered in this area. In recent years, many studies have been carried out in Sanjiang Tethyan metallogenic belt and aforementioned adjacent regions. To date, however, little attention has been paid to this deposit, for example, the geochronology of Mahuaping W-Be deposit still remains unsolved. In this study, we have pioneered research about muscovite 40Ar-39Ar age to better understand the geochronology of the Mahuaping W-Be deposit.展开更多
文摘目的评估北京社区居民的体适能情况,比较不同性别和年龄人群的差别,寻找影响2分钟步行测试(2-minute walking test,2MWT)能力的因素。方法2020年1月至2021年7月之间,在北京万寿路社区医院、北京东高地社区医院、北京大务旺社区医院就诊患者中,招募受试者进行2MWT、双手握力、背后抓握试验、坐位体前屈测试和简易肺功能的测试。比较男性组和女性组、老年组和非老年组的差异。利用线性回归方法探索测试结果与2MWT之间的相关性。结果最终共有187位患者纳入此研究,男性26例,女性161例,平均年龄(66.31±19.56)岁。男性组握力和、用力肺活量(forced vital capacity,FVC)、1秒用力呼气容积(forced expiratory volume in one second,FEV1)明显高于女性组,而椅子坐位体前屈测试距离明显低于女性组。老年组和非老年组相比,2MWT、握力和、肺功能、背后抓握测试距离、椅子坐位体前屈测试距离均明显低于非老年组。年龄、握力和、右侧背后抓握测试距离与2MWT之间存在明显相关性。结论在社区人群中,握力和、肺功能在男性中高于女性,女性的柔韧性优于男性。老年人的2MWT、肺功能、握力和、柔韧性指标均劣于非老年人。年龄、握力和、右侧背后抓握测试距离可能与2MWT相关。
基金funded by 973 Program (No.2014CB440903)Basic Scientific Research Funds (K1411)Chinese Geological Survey Grants (No.1212010633901,12120114039601,1212011220369,12120113093700)
文摘Lead and zinc resources are abundant in China, with the reserves of 100 million tons ranking only second in the world. There are more than 3000 lead-zinc mine areas nationwide. The classification of lead-zinc （Pb-Zn） deposits has been a highly controversial issue. From the standpoint of evaluating the potential of mineral resources, we construct a Pb-Zn deposit predictive type of classification scheme, and propose a Pb-Zn deposit comprehensive classification scheme （including 5 classes and 13 sub-types） that regards mineralization as the primary factor and the ore rock as secondary. According to the temporal and spatial distribution of Pb-Zn deposits, we conclude that a multi-period, multi-cycle orogenic environment is the most favorable for lead-zinc deposit growth, that the Proterozoic is the major eon for the growth of igneous-type deposits, the Paleozoic is an important development era for sedimentary Pb-Zn deposits, and the Mesozoic and Cenozoic are the heyday eras of magmatic type lead-zinc deposits. On this basis, we analyse the relationship between tectonic evolution and Pb-Zn metallogenic, and propose that the key factors determining geological mineralization are the metallogenic epoch of mineralization and tectonic environment, which determine the temporal and spatial distribution.
基金supported by the Critical Research and Development Plan of the People’s Republic of China(Deep Resources Exploration and Exploitation Project)(grant No.2016YFC0600305)the National Natural Science Foundation of China(grant No.41602103)+1 种基金the program of Yunnan Gold&Mineral Group Co.,Ltd Program(Metallogenic Regularity and Minerogenetic Series Research of Gold Polymetallic Deposits in West Yunnan Province,China)Geological Survey Program(grant No.DD20160124)
文摘Objective Located near the intersection of Yangtze craton, Tibet- Sanjiang orogen and Songpan-Ganzi orogen of Northwest Yunnan Province, the Mahuaping deposit is a unique large -scale tungsten-beryllium-fluorite ore deposit ever discovered in this area. In recent years, many studies have been carried out in Sanjiang Tethyan metallogenic belt and aforementioned adjacent regions. To date, however, little attention has been paid to this deposit, for example, the geochronology of Mahuaping W-Be deposit still remains unsolved. In this study, we have pioneered research about muscovite 40Ar-39Ar age to better understand the geochronology of the Mahuaping W-Be deposit.
