| 余吉远,孟勇,郭琳,李建星,白定邦.新疆东天山大黑山地区眼球状花岗片麻岩成因及形成环境[J].地质找矿论丛,2009,24(4):335-340 |
| 新疆东天山大黑山地区眼球状花岗片麻岩成因及形成环境 |
| ORIGIN AND ENVIRONMENT OF AUGEN GRANITIC GNEISS IN THE DAHEISHAN AREA IN EASTERN TIANSHAN MOUNTAINS,XINJIANG |
| 投稿时间：2008-10-22 |
| DOI：10.6053/j.issn.1001-1412.2009.4. 012 |
| 中文关键词: 眼球状花岗质片麻岩 原地重融改造 碰撞造山后期 大黑山 东天山 新疆 |
| 英文关键词:augen granitic gneiss the in-situ melting and reworking late to post orogenic collision Daheishan eastern Tianshan Mountains,Xinjiang |
| 基金项目:中国地质调查局西北地区基础地质调查及数据更新计划项目(编号:1212010610313)资助 |
| 作者 | 单位 | | 余吉远 | 西安地质矿产研究所, 西安, 710054 | | 孟勇 | 西安地质矿产研究所, 西安, 710054 | | 郭琳 | 长安大学, 地球科学与国土资源学院, 西安, 710054 | | 李建星 | 西安地质矿产研究所, 西安, 710054 | | 白定邦 | 西安地质矿产勘察开发院, 西安, 710100 |
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| 中文摘要: |
| 文章对东天山大黑山地区眼球状花岗质片麻岩的特征及其成因进行探讨。通过野外地质调查和岩石学、矿物学、地球化学的研究,认为区内岩体为岛弧钙碱性火山-沉积岩系原地重熔改造的产物,这种原地花岗片麻岩的成岩过程主要为深源熔体和流体与原岩的相互作用,使原岩发生不同程度的部分熔融,因而其地球化学特征同时受到原岩和外来熔体-流体的控制。锆石U-Pb年龄为1141Ma,代表了重熔事件的时间。根据岩石地球化学及构造环境判别图解认为该岩体为碰撞造山后期-期后的产物。 |
| 英文摘要: |
| This paper investigates the characteristics and origin of augen granitic gneiss in the Daheishan area in eastern Tianshan Mountains.Field relations and study on petrology,mineralogy,geochemistry indicate that the formation of the granitic gneiss is result of in-situ melting and reworking of the island arch calc-alkali volcanic-sedimentary rock sequence.In the rock-forming process the deeply derived melting material and fluid interacted with the island arch calc-alkali volcanic-sedimentary rock leading to differentially partial melting thus geochemistry of the gneiss is both characterized by the original rock and the deeply derived melting material and fluid.The zircon U-Pb age is 1141Ma representing the age of the melt event.By illustration of the geotectonic diagram(Rb/30-Hf-Ta×3 VS Rb-Y+Nb)the granitic gneiss is formed during late-to post-orogenic colision. |
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