| 超高压变质带金刚石研究进展 |
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| 引用本文： | 王晓赛,杜瑾雪,史本巽,王仕林.超高压变质带金刚石研究进展[J].岩石矿物学杂志,2020,39(2):183-194. |
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| 作者姓名： | 王晓赛 杜瑾雪 史本巽 王仕林 |
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| 作者单位： | 中国地质科学院 勘探技术研究所, 河北 廊坊 065000;中国地质大学(北京) 地球科学与资源学院, 北京 100083,中国地质大学(北京) 地球科学与资源学院, 北京 100083,中国地质大学(北京) 地球科学与资源学院, 北京 100083,中国地质大学(北京) 地球科学与资源学院, 北京 100083 |
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| 基金项目： | 中国地质调查局项目（DD20190072）；国家自然科学基金项目（41502059）；中央高校基本业务费专项资金项目（2652015041） |
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| 摘 要： | 金刚石在自然界中非常稀缺,是极其珍贵的矿产资源。其中,变质成因的金刚石陆续在世界范围内多个超高压变质带被发现,更新了人们对超高压变质作用和板块构造运动的认识,推动了超高压变质带动力学的研究,引起了学术界的广泛关注。然而,对于变质成因金刚石的形成机制,还未形成一致的认识。本文在综述前人研究成果的基础上,介绍了金刚石形成的大地构造背景,研究了其形成所需的地质环境和物理化学条件,并着重对超高压变质带金刚石成因机制进行了探讨,全面分析了温压条件、XCO2、fO2对变质成因金刚石形成的影响。对比发现,当变质作用的峰期压力达到金刚石稳定域且具有较高的温度时(压力>3 GPa,温度为600~1000℃),有利于金刚石的形成,C-O-H流体中的较高CO2含量和较低氧逸度也是超高压变质带金刚石形成的必需因素。另外,金刚石形成后折返早期的降温作用有利于其保存。
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| 关 键 词： | 金刚石 超高压变质带 C-O-H流体 成因机制 |
| 收稿时间： | 2019/1/23 0:00:00 |
| 修稿时间： | 2019/12/9 0:00:00 |
Research progress of diamond in ultrahigh-pressure metamorphic belts |
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| WANG Xiao-sai,DU Jin-xue,SHI Ben-xun and WANG Shi-lin.Research progress of diamond in ultrahigh-pressure metamorphic belts[J].Acta Petrologica Et Mineralogica,2020,39(2):183-194. |
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| Authors: | WANG Xiao-sai DU Jin-xue SHI Ben-xun and WANG Shi-lin |
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| Institution: | Institute of Exploration Techniques, Chinese Academy of Geosciences, Langfang 065000, China;School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China,School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China,School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China and School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | Diamonds are very rare in nature and are hence extremely precious mineral resources.The diamond of metamorphic origin,discovered in several ultrahigh pressures metamorphic zones in the world,has improved our understanding of ultrahigh pressure metamorphism and plate tectonic movement.Moreover,it has promoted the research on geodynamics of ultrahigh pressure metamorphic belt and attracted extensive attentions.However,further discussion is needed on the formation mechanism of metamorphic diamond.Based on recent research results,the authors described the tectonic background for the formation of metamorphic diamond,studied the geological environment and temperature-pressure conditions and discussed the origin of the diamond in the ultrahigh-pressure metamorphic zone.When the peak pressure of metamorphism reaches the stable region of diamond and has a higher temperature(pressure>3 GPa,temperature 600℃~1000℃),the conditions are beneficial to the formation of diamond.Higher CO2 content and lower oxygen fugacity in C-O-H fluids are also essential for diamond formation in ultrahigh pressure metamorphic belts.In addition,the cooling effect at the early exhumation is favorable for its preservation. |
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| Keywords: | diamond ultrahigh-pressure metamorphic zone C-O-H fluid the origin mechanism |
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