| 西南天山超高压变质带中志留纪岛弧火山岩岩片及其构造意义 |
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| 引用本文： | 蒲晓菲,宋述光,张立飞,魏春景.西南天山超高压变质带中志留纪岛弧火山岩岩片及其构造意义[J].岩石学报,2011,27(6):1675-1687. |
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| 作者姓名： | 蒲晓菲 宋述光 张立飞 魏春景 |
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| 作者单位： | 教育部造山带与地壳演化教育部重点实验室北京大学地质系,北京,100871 |
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| 基金项目： | 本文受国家基础科学发展规划项目(2009CB825007)、国家自然科学基金项目 (40730314、40821002、40825007)联合资助. |
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| 摘 要： | 西南天山造山带位于伊犁-中天山板块和塔里木板块之间,普遍被认为是古南天山洋闭合,塔里木板块和伊犁-中天山板块碰撞造山的产物.在西南天山含榴辉岩高压-超高压变质带中,我们在哈布腾苏和科普尔特2个地区识别出这一套基性-酸性火山岩.在哈布腾苏剖面,该套火山岩以酸性岩为主,在野外作为构造岩片与高压-超高压榴辉岩与蓝片岩相间产出...
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| 关 键 词： | 岛弧火山岩 志留纪 超高压变质带 西南天山 |
| 收稿时间： | 2010/9/27 0:00:00 |
| 修稿时间： | 2010/12/24 0:00:00 |
Silurian arc volcanic slices and their tectonic implications in the southwestern Tianshan UHPM belt, NW China |
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| PU XiaoFei,SONG ShuGuang,ZHANG LiFei and WEI ChunJing.Silurian arc volcanic slices and their tectonic implications in the southwestern Tianshan UHPM belt, NW China[J].Acta Petrologica Sinica,2011,27(6):1675-1687. |
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| Authors: | PU XiaoFei SONG ShuGuang ZHANG LiFei and WEI ChunJing |
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| Institution: | MOE Key Laboratory of Orogenic Belts and Crustal Evolution, Department of Geology, Peking University, Beijing 100871, China;MOE Key Laboratory of Orogenic Belts and Crustal Evolution, Department of Geology, Peking University, Beijing 100871, China;MOE Key Laboratory of Orogenic Belts and Crustal Evolution, Department of Geology, Peking University, Beijing 100871, China;MOE Key Laboratory of Orogenic Belts and Crustal Evolution, Department of Geology, Peking University, Beijing 100871, China |
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| Abstract: | Southwestern Tianshan is a 1000km orogenic belt between the Ili-Central Tianshan (ICTS) plate and the Tarim plate, believed to be resulted from the collision between Tarim plate and the northern ICTS plate with the consequent closure of the ancient South Tianshan Ocean. A set of arc volcanic rocks was discovered in Habutengsu and Kepuerte in the eclogite-bearing ultrahigh-pressure metamorphic (UHPM) belt of the southwestern Tianshan, occurring as tectonic slices intercalated in the field. Rocks from Habutengsu are mainly rhyolite and quartz porphyries, while those from Kepuerte cross-section, consist of low-grade metamorphosed basalt, andesite, dacite and rhyolite. Geochemical study reveals characteristics of typical arc volcanic sequences with right-declined chondrite-normalized REE patterns and enrichment of LILE and depletion of HFSE as the typical characteristics of normal island arc volcanics. The zircon U-Pb dating by SHRIMP gives ages ranging from 420Ma to 427Ma as the earliest record as known for arc volcanics in southwestern Tianshan. These ages of the arc volcanic rocks suggest that the ancient South Tianshan Ocean began its subduction no later than 427Ma. |
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| Keywords: | Island-arc volcanic rocks Silurian Ultrahigh-pressure metamorphic belt Southwestern Tianshan |
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