40Ar/39Ar Constraints on a Temporal Link between Gold Mineralization, Magmatism, and Continental Margin Transtension in the Jiaodong Gold Province, Eastern China
40Ar/39Ar Constraints on a Temporal Link between Gold Mineralization, Magmatism, and Continental Margin Transtension in the Jiaodong Gold Province, Eastern China
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DOI：
10.1086/378486
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发表时间：
2003-11
期刊：
影响因子：
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通讯作者：
Jian-wei Li;P. Vasconcelos;Jun Zhang;Mei‐Fu Zhou;Xiaojun Zhang;Feng-Hua Yang
中科院分区：
文献类型：
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作者：
Jian-wei Li;P. Vasconcelos;Jun Zhang;Mei‐Fu Zhou;Xiaojun Zhang;Feng-Hua Yang
胶东金矿省是中国最大的黄金储藏地。矿化和花岗岩类寄主在空间上都与地壳尺度的郯庐走滑断裂系统相关，该断裂系统沿中国东部中生代大陆边缘发育。对三个主要金矿床（焦家、新城和望儿山）的热液绢云母/白云母以及花岗岩闪长岩寄主中的火成黑云母进行了一系列的\(^{40}Ar/^{39}Ar\)激光增量加热分析，以建立金矿化、岩浆作用和郯庐断裂带运动之间可能的时间联系。岩浆黑云母晶体得出明确且一致的坪年龄在\(124.5\pm0.4\)Ma和\(124.0\pm0.4\)Ma（\(2\sigma\)）之间，而绢云母和白云母样品（共30个单矿物分离样）给出可重现的坪年龄范围从\(121.0\pm0.4\)Ma到\(119.2\pm0.2\)Ma（\(2\sigma\)）。将我们的\(^{40}Ar/^{39}Ar\)结果与胶东其他主要金矿床的年龄数据相结合表明，广泛的金矿化在2 - 3百万年期间同时发生。大多数金矿床与大量的基性到中性岩脉有密切的空间联系。基性岩脉的\(K - Ar\)年龄为123.5 - 119.6 Ma，与金矿床的年龄非常吻合。这些新获得的\(^{40}Ar/^{39}Ar\)年龄，结合胶东或邻近地区关于花岗岩闪长岩侵入体（130 - 126 Ma）、火山岩（124 - 114.7 Ma）和走滑断裂内变形岩石（132 - 120 Ma）的其他独立地质和年代学数据，也支持金矿化晚于花岗岩闪长岩岩浆作用，但与基性岩浆作用和火山作用同时发生的观点，所有这些都受早白垩世郯庐断裂的张扭运动控制。
The Jiaodong gold province is the largest gold repository in China. Both mineralization and granitoid hosts are spatially related to the crustal‐scale Tan‐Lu strike‐slip fault system, which developed along the Mesozoic continental margin in eastern China. A series of 40Ar/39Ar laser incremental heating analyses of hydrothermal sericite/muscovite from three major gold deposits (Jiaojia, Xincheng, and Wangershan) and igneous biotite from the granodiorite hosts were performed to establish a possible temporal link between gold mineralization, magmatism, and movement along the Tan‐Lu fault zone. Magmatic biotite crystals yield well‐defined and concordant plateau ages between \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $$124.5\pm 0.4$$ \end{document} Ma and \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $$124.0\pm 0.4$$ \end{document} Ma (2σ), whereas sericite and muscovite samples (a total of 30 single separates) give reproducible plateau ages ranging from \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $$121.0\pm 0.4$$ \end{document} Ma to \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $$119.2\pm 0.2$$ \end{document} Ma (2σ). An integration of our 40Ar/39Ar results with age data from other major gold deposits in Jiaodong demonstrates that widespread gold mineralization occurred contemporaneously during a 2–3‐m.yr. period. Most gold deposits show intimate spatial associations with abundant mafic to intermediate dikes. The mafic dikes have K‐Ar ages of 123.5–119.6 Ma, in excellent agreement with those of the gold deposits. These newly obtained 40Ar/39Ar ages, in combination with other independent geological and geochronological data on granodioritic intrusions (130–126 Ma), volcanic rocks (1243.6–114.7 Ma), and deformed rocks within strike‐slip faults (132–120 Ma) in Jiaodong or adjacent areas, also support the idea that gold mineralization postdated the granodioritic magmatism but was contemporaneous with mafic magmatism and volcanism, all controlled by the transtensional motion along the Tan‐Lu fault in the Early Cretaceous.