| 缺氧沉积物及其衍生物的Re-Os同位素定年与示踪 |
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| 引用本文： | 段瑞春,王浩,凌文黎,杨红梅.缺氧沉积物及其衍生物的Re-Os同位素定年与示踪[J].华南地质与矿产,2010(3):57-67. |
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| 作者姓名： | 段瑞春 王浩 凌文黎 杨红梅 |
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| 作者单位： | 1. 武汉地质矿产研究所,武汉,430205
2. 中国地质大学地球科学学院,武汉,430074 |
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| 基金项目： | 国土资源部公益性行业科研专项 |
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| 摘 要： | Os属铂族元素,其不同于亲石元素的地球化学性质使得Re-Os同位素体系在金属矿床和超基性-基性岩浆岩的定年与地球化学示踪研究中得到了广泛应用。Re、Os元素具有亲铁和一定程度的亲铜性质,能在还原环境中与硫化物和/或有机物结合而发生相对富集,因此可应用Re-Os同位素体系对缺氧环境中形成的富有机质沉积物及其衍生物进行定年与示踪研究。本文综述了近年来Re-Os地球化学在这一领域的研究新进展,包括黑色页岩中Re-Os富集机制的探讨,沉积岩的等时线法定年,风化作用、烃类成熟度和变质作用等对黑色页岩等富有机质沉积岩Re-Os同位素体系的影响,沉积环境的Os同位素示踪以及黑色页岩Os模式年龄的意义等,并对这些研究成果在石油、沥青等有机矿产的成因研究及其勘查工作中的应用前景进行了评述。
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| 关 键 词： | 黑色页岩 沥青 石油 Re-Os 定年与示踪 |
Progress in Re-Os Isotope Geochronology and Tracing Studies of Anoxic Sediments and their Derivatives |
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| DUAN Rui-chun,WANG Hao,LING Wen-li,YANG Hong-mei.Progress in Re-Os Isotope Geochronology and Tracing Studies of Anoxic Sediments and their Derivatives[J].Geology and Mineral Resources of South China,2010(3):57-67. |
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| Authors: | DUAN Rui-chun WANG Hao LING Wen-li YANG Hong-mei |
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| Institution: | 1.Wuhan Institute of Geology and Mineral Resources,Wuhan 430205,China;2.Faculty of Earth Sciences,China University of Geosciences,Wuhan 430074,China) |
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| Abstract: | As one of platinum-group elements,Osmium displays a geochemical feature distinct from that of lithophile elements.This character makes Re-Os isotopic system to have been widely used in geochronology of ore deposits and ultrabasic-basic rocks as well as their genesis tracing studies.Rhenium and Osmium are highly siderophile with a certain extent of chalcophile,and,under reductive condition,are preferredly concentrated in sulfide and/or organic matters relative to most silicate rock-making minerals.Thus,Re-Os isotopic system has been expected to be applied in dating and genesis tracing of organic-rich sediments and their derivatives formed under anoxic environment.This paper reviews some recent progress of Re-Os system applications,including discussion on mechanism of Re and Os uptake by organic-rich sedimentary rocks,isochron dating of organic-rich sedimentary rocks,effects of weathering,hydrocarbon maturation and metamorphism on the black shale＇s Re-Os isotopic system,isotopic tracing for sedimentary environment and geological significance of Os isotopic model age.Additionally,the significance of Re-Os system in understanding genesis of oil and bitumen ore deposits as well as in their exploring is discussed. |
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| Keywords: | Re-Os |
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