| 西南天山东德沟橄榄岩的岩相学、矿物学演化特征及其地质意义 |
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| 引用本文： | 孔凡梅,李旭平,吴苏,李守军,徐衍明.西南天山东德沟橄榄岩的岩相学、矿物学演化特征及其地质意义[J].岩石学报,2013,29(2):723-738. |
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| 作者姓名： | 孔凡梅 李旭平 吴苏 李守军 徐衍明 |
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| 作者单位： | 1. 山东科技大学地质科学与工程学院,山东省沉积成矿作用与沉积矿产重点实验室,青岛266510
2. 山东省地矿局第七地质勘查院,临沂,276006 |
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| 基金项目： | 本文受国家自然科学基金项目(40973022);国家973项目(2009CB825007);山东科技大学创新团队(2010KYTD103)和山东省高校优秀科研创新团队联合资助. |
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| 摘 要： | 中国西南天山东德橄榄岩出露于天山伊犁-中天山板块和塔里木板块碰撞造山带北缘,普遍经历了复杂多期的含水流体(熔体)交代作用.主要矿物为橄榄石、斜方辉石、尖晶石、角闪石、金云母和单斜辉石,研究发现,橄榄石和斜方辉石与地幔楔橄榄岩中橄榄石和斜方辉石成份相近,原生铬尖晶石具有SSZ环境橄榄岩的特征,次生绿色尖晶石形成于麻粒岩相-角闪相环境.岩相学、矿物转变结构分析和矿物组合及矿物成分变化表明,东德沟橄榄岩记录了复杂的演化历史,先后经历了地幔交代、麻粒岩相-角闪相退变质作用和蛇纹石化等阶段的演化.研究认为东德沟橄榄岩最初可能形成于915～961℃的地幔环境,而发生地幔交代时的温压条件约为770 ～ 900℃,10～18kbar.该橄榄岩全岩较低的TiO2含量和尖晶石中较低TiO2含量,以及矿物组合显示出因俯冲板块脱水而造成的快速冷却特征,表明东德沟橄榄岩极有可能是SSZ环境俯冲板片上地幔楔橄榄岩残片.
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| 关 键 词： | SSZ 含水交代 地幔楔橄榄岩 西南天山 |
| 收稿时间： | 2011/12/13 0:00:00 |
| 修稿时间： | 5/3/2012 12:00:00 AM |
Petrography, mineralogy and the evolution of peridotites from the Dongdegou, southwestern Tianshan and its geological significance |
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| KONG FanMei,LI XuPing,WU Su,LI ShouJun and Xu YanMing.Petrography, mineralogy and the evolution of peridotites from the Dongdegou, southwestern Tianshan and its geological significance[J].Acta Petrologica Sinica,2013,29(2):723-738. |
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| Authors: | KONG FanMei LI XuPing WU Su LI ShouJun and Xu YanMing |
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| Affiliation: | Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, Institute of Geological Science and Engineering, Shandong University of Science and Technology, Qingdao 266510, China;Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, Institute of Geological Science and Engineering, Shandong University of Science and Technology, Qingdao 266510, China;Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, Institute of Geological Science and Engineering, Shandong University of Science and Technology, Qingdao 266510, China;Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, Institute of Geological Science and Engineering, Shandong University of Science and Technology, Qingdao 266510, China;7th Geological Prospecting Institute, Shandong Provincial Bureau of Geology and Mineral Resources, Linyi 276006, China |
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| Abstract: | |
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| Keywords: | Supra-subducition Zone Metasomatism Mantle wedge peridotite Southwestern Tianshan |
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