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吉尔吉斯天山晚古生代岩浆活动及相关成矿作用
引用本文:陈博,马中平,孟广路,王斌,曹积飞.吉尔吉斯天山晚古生代岩浆活动及相关成矿作用[J].地质学报,2017,91(4):913-927.
作者姓名:陈博  马中平  孟广路  王斌  曹积飞
作者单位:1) 国土资源部岩浆作用成矿与找矿重点实验室,西安地质矿产研究所,西安,710054;2) 长安大学地球科学与资源学院,西安,710054,1) 国土资源部岩浆作用成矿与找矿重点实验室,西安地质矿产研究所,西安,710054,1) 国土资源部岩浆作用成矿与找矿重点实验室,西安地质矿产研究所,西安,710054,1) 国土资源部岩浆作用成矿与找矿重点实验室,西安地质矿产研究所,西安,710054,1) 国土资源部岩浆作用成矿与找矿重点实验室,西安地质矿产研究所,西安,710054
摘    要:本文通过对近年来有关吉尔吉斯天山研究进展的梳理,结合在吉尔吉斯斯坦的实地考察,系统论述了吉尔吉斯天山古生代基础地质情况,着重讨论了与岩浆作用相关的成矿过程。吉尔吉斯斯坦境内的天山由"尼古拉耶夫线"和阿特巴什-伊内尔切克断裂划分为北、中、南三部分。两条缝合带限定了早古生代捷尔斯凯伊洋和晚古生代南天山洋的发展和消亡过程。吉尔吉斯天山古生代岩浆作用大致分为两个阶段:早古生代捷尔斯凯伊洋演化过程中,与弧-陆碰撞、弧-弧碰撞相关的岩浆作用和晚古生代与南天山洋闭合相关的岩浆作用。晚古生代存在两个重要的成矿阶段:晚石炭世与南天山洋向北俯冲形成的弧岩浆作用相关的斑岩型、矽卡岩型铜-金矿床;早二叠世与后碰撞花岗岩侵入作用相关,并受剪切带控制的金-多金属矿床。南天山缝合带附近出露的不同岩体在岩石地球化学及矿化特征的差异,反映了位于阿特巴什-伊内尔切克断裂以北的岩浆源区为成矿物质贫瘠的中天山前寒武纪基底,而断裂以南的岩浆作用源区为富集流体及成矿元素的增生杂岩和塔里木被动陆缘沉积物。

关 键 词:天山  吉尔吉斯斯坦  古生代  岩浆作用  成矿作用

Late Paleozoic Magmatic Activities and Related Mineralization of Tianshan in Kyrgyzstan
CHEN Bo,MA Zhongping,MENG Guanglu,WANG Bin and CAO Jifei.Late Paleozoic Magmatic Activities and Related Mineralization of Tianshan in Kyrgyzstan[J].Acta Geologica Sinica,2017,91(4):913-927.
Authors:CHEN Bo  MA Zhongping  MENG Guanglu  WANG Bin and CAO Jifei
Abstract:Based on the summary of recent researches of Kyrgyz Tianshan and field investigation, this study discussed its basic geological background with particular interest on magmatism and related mineralization. Tianshan in Kyrgyzstan is composed of three major structural units: the northern, middle and southern sections, which are separated by the Nikolaev Line and Atbashi Inylchek fault. The two suture zones on both sides of the Middle Tianshan constrain the development and perishing process of Early Paleozoic Terskey ocean and Late Paleozoic South Tianshan ocean. Paleozoic magmatic activites in Kyrgyz Tianshan can be roughly divided into two stages: one resulted from continent arc collision and arc arc collision during evolution of Terskey ocean during early Paleozoic, and the other from closure of South Tianshan during late Paleozoic. Two stages of mineralization have been identified to occur in Tianshan in Kyrgyzstan during the Late Paleozoic: the Late Carboniferous porphyty or skarn type Cu Au deposits related to arc magma resulted from northward subduction of South Tianshan, and the Early Permian shearing zone controlled Au polymetal deposits related to intrusion of post collisional granite. The geochemical and metallogenic differences between two granitoid complexes exposed in the South Tianshan suture indicate that the magmatic sources in north of the Atebashi Yineirqieke fault was barren metamorphic Precambrian basement of the middle Tianshan, while the magmatic source in south of the fault was sediments in accretion complexes and passive continental margin, both of which were enriched in ore forming fluid and ore forming elements.
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