热事件发育地区自生黏土矿物形成过程分析:以北部湾盆地福山凹陷为例
Formation of Authigenic Clay Minerals in Hydrothermal Events Developed Regions: A Case Study from the Fushan Depression,Beibuwan Basin
查看参考文献39篇
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文摘
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自生黏土矿物形成过程是个备受关注的科学问题,查明该过程对于盆地热史分析至关重要。本次研究以北部湾盆地福山凹陷岩浆侵入体附近的沉积砂岩为研究对象,使用离心机分离出不同粒度的自生黏土矿物,并对其进行系统的矿物学、 Rb-Sr年代学及~(40)Ar-~(39)Ar年代学研究。结果表明,粗砂岩中自生黏土矿物富集且纯度很高,是开展年代学分析的理想对象; Rb-Sr等时线定年结果显示自生黏土矿物形成年代为~ 31 Ma,该年龄与岩浆岩U-Pb年代具有非常好的耦合关系,而~(40)Ar-~(39)Ar定年法受到“~(40)Ar丢失”的影响而缺乏地质意义。本次研究说明热事件发育地区自生黏土矿物的生长过程严格受控于短时间的岩浆岩侵入事件,而非长时间的盆地埋藏过程。 |
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其他语种文摘
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The formation process of authigenic clay minerals is a scientific issue that has received widespread attention,and a better understanding of this process is of great significance for thermal history analysis of basins. In this study,we conducted a systematic study of mineralogy,Rb-Sr isotopic dating and ~(40)Ar-~(39)Ar dating on the different size fractions of clay minerals separated from sandstones in the adjacent area of a large-scale igneous intrusion in the Fushan Depression,Beibuwan Basin. Our results suggest that authigenic clays in coarse sandstones are ideal for the dating due to enrichment of pure clay minerals. Rb-Sr isochron dating determined the formation age of authigenic clay minerals(at ~ 31 Ma),which matches well with the youngest zircon U-Pb ages of the igneous rocks. By contrast,~(40)Ar-~(39)Ar dating provided an unreliable age because of a serious loss of ~(40)Ar. This study suggests that the formation process of authigenic clay minerals in hydrothermal- developed regions is mainly controlled by short-time hydrothermal event(igneous intrusion) rather than long-time stepwise burial. |
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来源
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矿物岩石地球化学通报
,2017,36(1):59-66 【核心库】
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DOI
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10.3969/j.issn.1007-2802.2017.01.007
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关键词
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自生黏土矿物
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构造热事件
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Rb-Sr法定年
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~(40)Ar-~(39)Ar法定年
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北部湾盆地
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地址
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1.
中国地质大学(武汉)海洋学院, 构造与油气资源教育部重点实验室, 武汉, 430074
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中国地质大学(武汉), 构造与油气资源教育部重点实验室, 武汉, 430074
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中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵阳, 550081
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Radiogenic Isotope Facility,School of Earth Sciences,The University of Queensland, Australia, Brisbane, 4072
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1007-2802 |
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学科
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地质学 |
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基金
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中央高校基本科研业务费和专项资金资助项目
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国家自然科学基金项目
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中国地质大学（武汉）构造与油气资源教育部重点实验室基金项目
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文献收藏号
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CSCD:5936081
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