| 蛇绿岩型金刚石和铬铁矿深部成因 |
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| 引用本文： | 杨经绥,徐向珍,张仲明,戎合,李源,熊发挥,梁风华,刘钊,刘飞,李金阳,李兆丽,陈松永,郭国林,Paul ROBINSON.蛇绿岩型金刚石和铬铁矿深部成因[J].地球学报,2013,34(6):643-653. |
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| 作者姓名： | 杨经绥 徐向珍 张仲明 戎合 李源 熊发挥 梁风华 刘钊 刘飞 李金阳 李兆丽 陈松永 郭国林 Paul ROBINSON |
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| 作者单位： | 中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室地幔研究中心;中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室地幔研究中心;中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室地幔研究中心;中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室地幔研究中心;中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室地幔研究中心;中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室地幔研究中心;中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室地幔研究中心;中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室地幔研究中心;中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室地幔研究中心;中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室地幔研究中心;中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室地幔研究中心;中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室地幔研究中心;中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室地幔研究中心;中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室地幔研究中心 |
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| 基金项目： | 国家行业专项“深部探测技术与实验研究”(编号: SinoProbe-05);自然科学基金重点项目(编号: 40930313); 自然科学基金创新群体项目(编号: 40921001); 中国地质调查局工作项目(编号: 1212011121263) |
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| 摘 要： | 地球上的原生金刚石主要有3种产出类型,分别来自大陆克拉通下的深部地幔金伯利岩型金刚石、板块边界深俯冲变质岩中超高压变质型金刚石,和陨石坑中的陨石撞击型金刚石。在全球5个造山带的10处蛇绿岩的地幔橄榄岩或铬铁矿中均发现金刚石和其他超高压矿物的基础上,我们提出地球上一种新的天然金刚石产出类型,命名为蛇绿岩型金刚石。认为蛇绿岩型金刚石普遍存在于大洋岩石圈的地幔橄榄岩中,并提出蛇绿岩型金刚石和铬铁矿的深部成因模式。认为早期俯冲的地壳物质到达地幔过渡带(410~660 km深度)后被肢解,加入到周围的强还原流体和熔体中,当熔融物质向上运移到地幔过渡带顶部,铬铁矿和周围的地幔岩石以及流体中的金刚石等深部矿物一并结晶,之后,携带金刚石的铬铁矿和地幔岩石被上涌的地幔柱带至浅部,经历了洋盆的拉张和俯冲阶段,最终在板块边缘就位。
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| 关 键 词： | 金刚石 蛇绿岩 铬铁矿 地幔橄榄岩 |
Ophiolite-type Diamond and Deep Genesis of Chromitite |
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| YANG Jing-sui,XU Xiang-zhen,ZHANG Zhong-ming,RONG He,LI Yuan,XIONG Fa-hui,LIANG Feng-hu,LIU Zhao,LIU Fei,LI Jin-yang,LI Zhao-li,CHEN Song-yong,GUO Guo-lin and Paul ROBINSON.Ophiolite-type Diamond and Deep Genesis of Chromitite[J].Acta Geoscientia Sinica,2013,34(6):643-653. |
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| Authors: | YANG Jing-sui XU Xiang-zhen ZHANG Zhong-ming RONG He LI Yuan XIONG Fa-hui LIANG Feng-hu LIU Zhao LIU Fei LI Jin-yang LI Zhao-li CHEN Song-yong GUO Guo-lin and Paul ROBINSON |
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| Institution: | CARMA, State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences;CARMA, State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences;CARMA, State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences;CARMA, State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences;CARMA, State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences;CARMA, State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences;CARMA, State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences;CARMA, State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences;CARMA, State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences;CARMA, State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences;CARMA, State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences;CARMA, State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences;CARMA, State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences;CARMA, State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences |
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| Abstract: | The three main occurrences of natural diamond currently recognized on Earth are kimberlites from the deep mantle under cratonic lithosphere, ultrahigh-pressure metamorphic rocks formed by subduction of continental crust, and meteorites and rocks in impact structures. Based on the discovery of diamonds and other ultrahigh-pressure minerals in ophiolitic mantle peridotites and podiform chromitites from 10 ophiolites in 5 plate boundaries, we propose a new occurrence of diamond, called ophiolite diamond. We suggest that ophiolite diamond exists universally in the mantle rocks beneath oceanic lithosphere, and thus propose a model that diamond-hosted chromitites and mantle rocks form at depths over 300 km at the top of the transition zone between the upper and lower mantle. The carbon and other crustal materials were derived from earlier subducted crust. The diamond-bearing chromitites and mantle rocks are brought to shallow depth by mantle convection and emplaced at plate boundaries along with other oceanic lithosphere. |
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| Keywords: | diamond ophiolite chromitite mantle peridotite |
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