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首页> 外文期刊>Journal of Asian earth sciences >Geochemistry of A-type granites in the Huangshaping polymetallic deposit (South Hunan, China): Implications for granite evolution and associated mineralization
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Geochemistry of A-type granites in the Huangshaping polymetallic deposit (South Hunan, China): Implications for granite evolution and associated mineralization

机译：黄沙坪多金属矿床（中国湖南南部）A型花岗岩的地球化学：对花岗岩演化和相关矿化的意义

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The Huangshaping granites in Hunan Province, South China were investigated for their geochemical characteristics. Three types of granites have been petrographically identified: quartz porphyry, granophyre, and granite porphyry. Whole rock geochemistry suggests that the Huangshaping granites, especially the granite porphyry, exhibit typical A-type granite characteristics with their enrichment in Si, Rb, U, Th, and Nb and significant depletion in Ba, Sr, Ti, Eu, and P. Based on the Al, Y and Zr contents as well as the REE patterns of the rocks investigated, the quartz porphyry and the granophyre are classified as A_1 type alkaline granites whereas the granite porphyry is considered as A_2 type aluminous granite. Whole rock and quartz/feldspar O isotope data yields a wide range of δ~(18)O_(SMOW) values (11.09-26.32‰). The granites are characterized by high radiogenic Pb isotopic composition. The present-day whole rock Pb isotopic ratios are ~(206)Pb/~(204)Pb= 18.706-19.155, ~(207)Pb/~(204)Pb = 15.616-15.711 and ~(208)Pb/~(204)Pb = 38.734-39.296. Combining the O-Pb isotope compositions with major, trace and REE geochemistry and regional geology characteristics, the Huangshaping granites were determined to resemble within-plate granites that were mainly derived from a felsic infracrustal source related to continental extension. The magma source of the quartz porphyry and the granophyre may have been generated from deeper depths, and then ascended rapidly with limited water content and low oxygen fugacity, which contributed to Cu, Pb and Zn mineralization. On the other hand, the magma that generated the granite porphyry may have ascended relatively slower and experienced pronounced crystal fractionation, upper-crustal basement rock contamination (assimilation) and wall-rock interaction, producing the Sn- and W-rich granite porphyry. This study reveals the crustal extension process and associated magmatic-metallogenic activities during 180-150 Ma in South Hunan.
机译：研究了中国南方湖南省黄沙坪花岗岩的地球化学特征。岩石学上已经鉴定出三种类型的花岗岩：石英斑岩，花岗石和花岗岩斑岩。整个岩石地球化学表明，黄沙坪花岗岩，尤其是斑岩斑岩，表现出典型的A型花岗岩特征，富含Si，Rb，U，Th和Nb，Ba，Sr，Ti，Eu和P大量耗竭。根据所调查岩石的Al，Y，Zr含量以及REE模式，将石英斑岩和花岗石分类为A_1型碱性花岗岩，将花岗岩斑岩视为A_2型铝质花岗岩。整个岩石和石英/长石O同位素数据产生的δ〜（18）O_（SMOW）值范围很广（11.09-26.32‰）。花岗岩的特征是高放射性的Pb同位素组成。目前的全岩Pb同位素比为〜（206）Pb /〜（204）Pb = 18.706-19.155，〜（207）Pb /〜（204）Pb = 15.616-15.711和〜（208）Pb /〜（ 204）Pb = 38.734-39.296。结合具有主要，痕量和稀土元素地球化学特征和区域地质特征的O-Pb同位素组成，确定了黄沙坪花岗岩与板内花岗岩类似，这些花岗岩主要来源于与大陆扩张有关的长英质地壳源。石英斑岩和花岗岩的岩浆源可能来自更深的深度，然后在水含量有限和氧逸度低的情况下迅速上升，这促进了铜，铅和锌的矿化。另一方面，产生花岗岩斑岩的岩浆可能上升得相对较慢，并经历了明显的晶体分馏，上地壳基底岩石污染（同化）和壁-岩相互作用，从而产生了富含Sn和W的花岗岩斑岩。这项研究揭示了湘南地区180-150 Ma期间的地壳伸展过程和相关的岩浆-成矿活动。

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