| 新特提斯洋俯冲起始的地质记录:土耳其南部蛇绿岩和变质底板 |
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| 引用本文： | 陈晨,苏本勋,景揭俊,肖燕,林伟,褚杨,刘霞,白洋.新特提斯洋俯冲起始的地质记录:土耳其南部蛇绿岩和变质底板[J].岩石学报,2018,34(11):3302-3314. |
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| 作者姓名： | 陈晨 苏本勋 景揭俊 肖燕 林伟 褚杨 刘霞 白洋 |
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| 作者单位： | 中国科学院地质与地球物理研究所, 中国科学院矿产资源研究重点实验室, 北京 100029;中国科学院大学, 北京 100049;中国科学院地球科学研究院, 北京 100029,中国科学院地质与地球物理研究所, 中国科学院矿产资源研究重点实验室, 北京 100029;中国科学院大学, 北京 100049;中国科学院地球科学研究院, 北京 100029,中国科学院地质与地球物理研究所, 中国科学院矿产资源研究重点实验室, 北京 100029;中国科学院大学, 北京 100049;中国科学院地球科学研究院, 北京 100029,中国科学院地球科学研究院, 北京 100029;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,中国科学院大学, 北京 100049;中国科学院地球科学研究院, 北京 100029;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,中国科学院大学, 北京 100049;中国科学院地球科学研究院, 北京 100029;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,中国科学院地质与地球物理研究所, 中国科学院矿产资源研究重点实验室, 北京 100029;中国科学院大学, 北京 100049;中国科学院地球科学研究院, 北京 100029,中国科学院地质与地球物理研究所, 中国科学院矿产资源研究重点实验室, 北京 100029;中国科学院大学, 北京 100049;中国科学院地球科学研究院, 北京 100029 |
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| 基金项目： | 本文受国家自然科学基金项目（91755205、41772055）和岩石圈演化国家重点实验室课题（201701）联合资助. |
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| 摘 要： | 在现行板块构造理论的框架下,板块的初始俯冲是岩浆活动和构造运动发生转变的重要过程,亦是理解板块运动的关键节点。在俯冲起始过程中,主要存在四个方面的地质记录,分别为一系列地球化学成分多样的岩浆活动、SSZ型蛇绿岩、变质底板和玻安岩及其对应的铬铁矿床。特提斯造山带作为公认的研究板块构造理论尤其是初始俯冲的关键场所,一直备受地学界的重视。而土耳其南部构造带作为特提斯造山带的重要组成部分,亦是确定亚欧板块和阿拉伯板块之间缝合线存在的重要标志。该南部构造带是研究新特提斯洋俯冲起始的理想场所,上述关于俯冲初始的四个地质记录均保存良好,且有如下方面的重要特点:1)不同地区的镁铁质岩石甚至同一地区的镁铁质岩石具有不同的地球化学特征,从似洋中脊玄武岩,到过渡型岩石类型和玻安质岩石均有发育; 2)大部分蛇绿岩具有完整的序列,各单元及变质底板岩石中普遍发育侵入的基性岩脉,产状多变,是多期岩浆事件的产物; 3)蛇绿岩下部通常发育一套角闪岩相变质底板,且其年龄与蛇绿岩的形成年龄基本一致; 4)蛇绿岩中普遍发育铬铁矿床,以高Cr型为主,部分蛇绿岩中还赋存高Al-高Cr的过渡型铬铁矿,均被认为是幔源岩浆与地幔橄榄岩反应的产物。因而,这些地质体完整记录了新特提斯洋形成-俯冲-消减的演化过程。
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| 关 键 词： | 初始俯冲 蛇绿岩 变质底板 铬铁矿床 新特提斯洋 |
| 收稿时间： | 2018/3/8 0:00:00 |
| 修稿时间： | 2018/8/8 0:00:00 |
Geological records of subduction initiation of Neo-Tethyan ocean: Ophiolites and metamorphic soles in southern Turkey |
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| CHEN Chen,SU BenXun,JING JieJun,XIAO Yan,LIN Wei,CHU Yang,LIU Xia and BAI Yang.Geological records of subduction initiation of Neo-Tethyan ocean: Ophiolites and metamorphic soles in southern Turkey[J].Acta Petrologica Sinica,2018,34(11):3302-3314. |
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| Authors: | CHEN Chen SU BenXun JING JieJun XIAO Yan LIN Wei CHU Yang LIU Xia and BAI Yang |
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| Institution: | Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;University of Chinese Academy of Sciences, Beijing 100049, China;Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China,Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;University of Chinese Academy of Sciences, Beijing 100049, China;Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China,Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;University of Chinese Academy of Sciences, Beijing 100049, China;Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China,Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China;State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China,University of Chinese Academy of Sciences, Beijing 100049, China;Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China;State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China,University of Chinese Academy of Sciences, Beijing 100049, China;Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China;State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China,Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;University of Chinese Academy of Sciences, Beijing 100049, China;Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China and Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;University of Chinese Academy of Sciences, Beijing 100049, China;Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | Subduction initiation is an essential process in magmatic and tectonic evolution of the Earth and plays an important role in plate tectonics. During subduction initiation, four main geological units are formed, namely; magmatic episodes with various geochemical characteristics, supra-subduction zone (SSZ) ophiolites, metamorphic soles and boninitic magmatism with associated chromitite deposits. The Tethyan orogenic belt has been attracting a great deal of attention for a long time as it preserves an excellent record of plate tectonic processes. The southern Turkey occupies part of this belt, and preserves well-defined SSZ ophiolites and associated metamorphic soles, which are considered as the remnants of the Neo-Tethyan oceanic plate between the Eurasian and Arabian continental plates. These geological records of subduction initiation in southern Turkey are summarized as following:1) mantle-derived magmatic rocks are widely developed and show large compositional variations from MORB-like, through transitional to boninitic; 2) most ophiolites and their associated metamorphic soles are well preserved and contain complex mafic dykes systems, indicating multiple episodes of magmatic activities; 3) the metamorphic soles commonly underlie the ophiolites and their metamorphic histories are coeval to the formation of the ophiolites; 4) numerous chromitite deposits occur in the mantle and crustal sequences of the ophiolites and span a wide range of compositions from high-Cr, intermediate to high-Al types, most likely in response to various magmatic events. Thus, these well-characterized geological massifs record the entire formation to subduction process of the Neo-Tethyan ocean. |
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| Keywords: | Subduction initiation Ophiolite Metamorphic sole Chromite deposit Neo-Tethyan ocean |
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