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首页> 外文期刊>Journal of Asian earth sciences >Petrogenesis of Late Jurassic Pb-Zn mineralized high δ~(18)O granodiorites in the western Nanling Range, South China
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Petrogenesis of Late Jurassic Pb-Zn mineralized high δ~(18)O granodiorites in the western Nanling Range, South China

机译：华南西部西部晚侏罗世铅锌矿化高δ〜（18）O花岗闪长岩的成因

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摘要

Amphibole-bearing granites are commonly considered to be I-type granites, derived by partial melting of igneous rocks. However, the contribution of sedimentary rocks to the source of such rocks is difficult to identify and remains debated. Here, we present a study of amphibole-bearing Pb-Zn mineralized granodiorites in the western Nanling Range of South China. LA-ICP-MS zircon U-Pb ages show that these granodiorites were generated during the Late Jurassic (ca. 161 Ma). They have variable SiO2 contents of 61.8-70.7 wt% and have high-K or shoshonitic characteristics, with varied Mg-# (0.28-0.54). These granodiorites are enriched in Th and U, and depleted in Nb, Ta and Ti. They display enriched light rare earth element (LREE) and flat heavy rare earth element (HREE) patterns, with slightly negative to negligible Eu anomalies (delta Eu = 0.74-0.95). Given their high zircon delta O-18 values (8.8 parts per thousand-11.9 parts per thousand), as well as negative epsilon(Nd)(t) (-7.5 to -5.1) and zircon epsilon(Hf)(t) (-13.9 to -7.5) values, we suggest that these Pb-Zn mineralized granodiorites in the western Nanling Range were derived mainly by partial melting of Middle Neoproterozoic mafic volcaniclastic rocks from the Nanhua rift basin, South China, in the lower crust. This study provides an important insight into the genesis of amphibole-bearing granites. We suggest that the partial melting of crustal metasedimentary and metaigneous rocks is an important mechanism for the Mesozoic crustal reworking of South China, and granodiorites generated by such a mechanism should also favor Pb-Zn mineralization.
机译：带有闪石的花岗岩通常被认为是I型花岗岩，是由火成岩的部分融化产生的。但是，沉积岩对这类岩石源的贡献很难确定，并且仍在争论中。在这里，我们提出了对华南西部西部含闪石的铅锌矿化花岗闪长岩的研究。 LA-ICP-MS锆石U-Pb年龄表明，这些花岗闪长岩是在侏罗纪晚期（约161 Ma）产生的。它们具有61.8-70.7 wt％的可变SiO2含量，并具有高K或细铁矿特性，且Mg-＃（0.28-0.54）变化。这些花岗闪长岩富含Th和U，而Nb，Ta和Ti则贫乏。它们显示出富集的轻稀土元素（LREE）和扁平重稀土元素（HREE）模式，Eu异常略微负于或可忽略不计（δEu = 0.74-0.95）。鉴于其较高的锆石δO-18值（每千份8.8份至每千份11.9份），以及负ε（Nd）（t）（-7.5至-5.1）和锆石ε（Hf）（t）（- 13.9至-7.5）的值，我们认为这些位于南岭山脉西部的Pb-Zn矿化花岗闪长岩主要是由华南下裂壳中新元古代镁铁质火山碎屑岩的部分融化产生的。这项研究为含闪石的花岗岩的成因提供了重要的见识。我们认为，地壳的准沉积和亚火成岩的部分熔融是华南中生代地壳再造的重要机制，并且这种机制产生的花岗闪长岩也应有利于铅锌矿化。

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    《Journal of Asian earth sciences》 |2020年第may1期|104236.1-104236.17|共17页
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  • 作者单位

    Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Isotope Geochem Guangzhou 510640 Peoples R China|Univ Chinese Acad Sci Coll Earth & Planetary Sci Beijing 100049 Peoples R China;

    Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Isotope Geochem Guangzhou 510640 Peoples R China|Univ Chinese Acad Sci Coll Earth & Planetary Sci Beijing 100049 Peoples R China|Chinese Acad Sci Ctr Excellence Tibetan Plateau Earth Sci Beijing 100101 Peoples R China;

    Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Isotope Geochem Guangzhou 510640 Peoples R China;

    Univ Sydney Sch Geosci Sydney NSW 2006 Australia;

    Chinese Acad Sci Guangzhou Inst Geochem Key Lab Mineral & Metallogeny Guangzhou 510640 Peoples R China;

    Chinese Acad Sci Inst Geol & Geophys Beijing 100029 Peoples R China;

    Hunan Univ Sci & Technol Sch Resource & Environm & Safety Engn Xiangtan 411201 Peoples R China;

    Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Isotope Geochem Guangzhou 510640 Peoples R China|Chinese Acad Sci Ctr Excellence Tibetan Plateau Earth Sci Beijing 100101 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Amphibole-bearing granite; Partial melting of metasedimentary and metaigneous rocks; Western Nanling Range; South China;

    机译：含闪石的花岗岩;准沉积和准火成岩的部分熔融;南岭西部;华南;

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