| 西昆仑大同岩体岩浆成因绿帘石矿物学研究及其对岩体形成构造环境的制约 |
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| 引用本文： | 廖世勇,姜耀辉,杨万志.西昆仑大同岩体岩浆成因绿帘石矿物学研究及其对岩体形成构造环境的制约[J].矿物学报,2009,29(1). |
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| 作者姓名： | 廖世勇 姜耀辉 杨万志 |
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| 作者单位： | 1. 南京大学成矿作用国家重点实验室地球科学系,江苏南京,210093
2. 新疆地质调查院,新疆乌鲁木齐83000 |
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| 基金项目： | 国家自然科学基金项目(批准号:40572037) |
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| 摘 要： | 大同岩体位于西昆仑北带,形成于早奥陶世,对于研究西昆仑造山带早古生代构造演化具有重要意义,但对其形成的构造环境的认识还具有很大的不确定性。本文尝试通过岩浆成因绿帘石的研究,为该岩体形成的构造环境提供新的制约。大同岩体中岩浆成因绿帘石呈自形-半自形,具有明显的成分环带,并发育褐帘石核,同时绿帘石熔蚀现象明显,常为新鲜黑云母包裹,或与新鲜的钾长石呈港湾状或不规则形态接触。绿帘石的Ps值(绿帘石端员组分的摩尔分数)介于0.26～0.31之间,并具有较低的TiO2含量,w(TiO2)<0.2%。绿帘石结晶于深部岩浆房(>1.0GPa),并在岩浆上升过程中发生熔蚀。绿帘石熔蚀速率计算结果显示,大同岩体岩浆上升速率不小于900m/a,从而表明岩体是快速上升侵位的产物,形成于拉张环境。结合区域地质资料,我们认为西昆仑地区早古生代早期存在一期俯冲挤压背景下的间歇拉张作用。
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| 关 键 词： | 岩浆绿帘石 早古生代演化 大同岩体 西昆仑 |
MINERALOGICAL STUDY ON MAGMATIC EPIDOTE FROM DATONG PLUTON, AND ITS IMPLICATION FOR TECTONIC SETTING OF WESTERN KUNLUN REGION |
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| LIAO Shi-yong,JIANG Yao-hui,YANG Wan-zhi.MINERALOGICAL STUDY ON MAGMATIC EPIDOTE FROM DATONG PLUTON, AND ITS IMPLICATION FOR TECTONIC SETTING OF WESTERN KUNLUN REGION[J].Acta Mineralogica Sinica,2009,29(1). |
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| Authors: | LIAO Shi-yong JIANG Yao-hui YANG Wan-zhi |
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| Institution: | 1. Key State Laboratary for Mineral Deposits Research;Nanjing University;Nanjing 210093;China;2. Xinjiang Institute of Geological Survey;Urumqi 83000;China |
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| Abstract: | The Datong pluton,intruded in the West-Kunlun region during the Ordovician,plays an important role in exploring the tectonic evolution history of the West-Kunlun region during Paleozoic time,which is still under debate.The authors tried to put some new constraints on the tectonic evolution of this region via mineralogy and mineral chemistry studies of magmatic epidote.Magmatic epidote in the Datong pluton is present as subhedral to euhedral crystals included in biotite,hornblende,or,embayed or in vermicular... |
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| Keywords: | magmatic epidote tectonic setting of Paleozoic Datong pluton western Kunlun |
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