[1]尹继元.2015.西准噶尔谢米斯台山东段早石炭世玄武安山岩的成因及意义.大地构造与成矿学,39(5):876-888.doi:10.16539/j.ddgzyckx.2015.05.011
　YIN Jiyuan,CHEN Wen.2015.Petrogenesis and Tectonic Implication of Early Carboniferous Basaltic Andesite in the Eastern Part of Xiemisitai Mountain, Northern West Junggar.Geotectonica et Metallogenia,39(5):876-888.doi:10.16539/j.ddgzyckx.2015.05.011
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西准噶尔谢米斯台山东段早石炭世玄武安山岩的成因及意义
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《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2015年39卷05期
页码:
876-888
栏目:
岩石大地构造与地球化学
出版日期:
2015-11-10

文章信息/Info

Title:
Petrogenesis and Tectonic Implication of Early Carboniferous Basaltic Andesite in the Eastern Part of Xiemisitai Mountain, Northern West Junggar
作者:
尹继元1;  2;  3;  陈 文1;  袁 超4;  肖文交2;  5;  6;  龙晓平4;  蔡克大6
1.中国地质科学院 地质研究所, 同位素热年代学实验室, 大陆构造与动力学国家重点实验室, 北京 100037; 2.中国科学院 地质与地球物理研究所, 岩石圈演化国家重点实验室, 北京 100029; 3.中国科学院 地球化学研究所, 矿床地球化学国家重点实验室, 贵州 贵阳 550002; 4.中国科学院 广州地球化学研究所, 同位素地球化学国家重点实验室, 广东 广州 510640; 5.中国科学院 青藏高原地球科学卓越创新中心, 北京 100101; 6.中国科学院 新疆矿产资源研究中心,
Author(s):
YIN Jiyuan1;  2;  3;  CHEN Wen1;  YUAN Chao4;  XIAO Wenjiao2;  5;  6;  LONG Xiaoping4 and CAI Keda6
1. Laboratory of Isotope Thermochronology, State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; 2. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 3. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, Guizhou, China; 4. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China; 5. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China; 6. Xinjiang Research Center for Mineral Resources, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China
关键词:
西准噶尔;  早石炭世;  岛弧环境;  玄武安山岩
Keywords:
West Junggar;  Early Carboniferous;  island-arc environment;  basaltic andesite
分类号:
P581; P597
DOI:
10.16539/j.ddgzyckx.2015.05.011
文献标志码:
A
摘要:
本文对西准噶尔谢米斯台山东段早石炭世的火山岩进行了Ar-Ar年代学、岩石学和地球化学研究。Ar-Ar定年结果显示, 这些火山岩喷发时间为338.7±6.9 Ma。在地球化学方面, 它们显示钙碱性的特征, 富集大离子亲石元素(LILE)和轻稀土元素(LREE), 亏损高强场元素(HFSE, 如Nb和Ta)以及具有高的Rb/Y和Ba/Nb比值, 显示岛弧岩浆的特征。而在Th-Hf/3-Nb/16环境判别图中, 所有样品落在岛弧玄武岩区域。结合古地理、古地磁、岩浆岩以及大地构造研究成果, 作者认为西准噶尔地区在早石炭世处于岛弧环境, 即准噶尔洋向西北侧和东南侧的双向俯冲。在亚洲洋的构造演化过程中, 还存在斋桑洋、北天山洋和准噶尔洋等多个洋内俯冲系统。
Abstract:
This paper presents new Ar-Ar age and geochemical data for the early Carboniferous volcanic rocks in the eastern part of the Xiemisitai Mountain, northern West Junggar. 40Ar/39Ar dating of the basaltic andesite yielded a well-defined plateau age of 338.7±6.9 Ma. In geochemistry, the basaltic andesite exhibits calc-alkaline characteristics, enriched in LILE and LREE, depleted in HFSE (e.g. Nb and Ta) with high Rb/Y and Ba/Nb ratios, which is consistent with the geochemical characteristics of arc-related magmas. Furthermore, all rocks plot in the island arc basalt field in the Th-Hf/3-Nb/16 tectonic discrimination diagram. Combined with previous results of palaeogeography, palaeomagnetism, magmatic rocks and structural geology, we consider that the basaltic andesite was likely generated in an island arc setting. Subduction of Junggar Ocean was bidirectional, toward the northwest and southeast, respectively. Paleo-Asian Ocean might have experienced multiple intra-oceanic subduction (i.e, North Tianshan Ocean, Junggar Ocean, Irtysh-Zaysan Ocean, etc.) during its tectonic evolution.

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更新日期/Last Update: 1900-01-01