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首页> 外文期刊>Mineralium Deposita >Structural and geochronological studies on the Liba goldfield of the West Qinling Orogen, Central China
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Structural and geochronological studies on the Liba goldfield of the West Qinling Orogen, Central China

机译：中西部西秦岭造山带里坝金矿田的构造和年代学研究

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摘要

The Liba goldfield, located to the northeast of the Zhongchuan Granite in the West Qinling Orogen (WQO) of mainland China, contains the largest known gold resource of 2.8 Moz in the Zhongchuan area. Devonian metasedimentary rocks host the structurally controlled gold mineralization, which is associated with silica–sericite–chlorite–carbonate alteration. Two major styles of mineralization occurred at the goldfield, which are disseminated sediment-hosted and quartz vein hosted types. Pyrite, arsenopyrite, and arsenian pyrite are major gold carriers and gold also occurs as native gold grains and electrum spatially associated with the sulfides. Numerous felsic/intermediate dykes have a similar structural control as the mineralization, and their contacts with host rocks are recognized as favorable zones for mineralization. Detailed fieldwork in conjunction with geochronological studies has helped to define the deformation history and gold metallogenesis of the goldfield. Three major phases of deformation have been recognized in the Zhongchuan area. The first deformation (D1) event was compressional in broadly a N–S orientation, the second (D2) event was also compressional and orientated in a NE–SW direction, and the third (D3) event was post-mineralization and was associated with the emplacement of barren calcite and anhydrite veins. Compression related to D2 is the key process that controlled the distribution of igneous dykes and gold mineralization in the Liba goldfield. Both igneous and hydrothermal fluids preferentially focused along dilational jogs under local trans-extension, which took place during the late stage of D2. Precise dating with high-resolution ion microprobe (SHRIMP) U–Pb on zircon and 40Ar/39Ar on muscovite, biotite, hornblende, and plagioclase of crosscutting pre-mineralization granitic porphyry and diorite dykes have constrained the mineralization age to after ca. 227 Ma. 40Ar/39Ar analysis of minerals formed in hydrothermal alteration zones associated with gold mineralization indicates that there was a widespread ca. 216 Ma hydrothermal event that affected almost all lithologies in the area. This detailed investigation is the first study to tightly constrain the timing of gold mineralization in the WQO. The broadly overlapping timing and similar structural control of the mineralization and igneous dykes show a promising correlation, which could be potentially used to map this Late Triassic gold mineralization event in the WQO.
机译：位于中国大陆西秦岭造山带（WQO）中川花岗岩东北的利巴金矿区，是中川地区已知最大的2.8 Moz黄金资源。泥盆纪准沉积岩具有结构受控的金矿化作用，这与二氧化硅-绢云母-亚氯酸盐-碳酸盐蚀变有关。金矿区发生了两种主要的矿化类型，即散布的沉积物沉积和石英脉的沉积类型。黄铁矿，毒砂和黄铁矿是主要的金载体，金也以天然金颗粒和与硫化物在空间上相关的电子发生。许多长英质/中级堤防具有与矿化相似的结构控制，并且它们与基质岩石的接触被认为是有利于矿化的区域。结合地质年代学的详细野外工作有助于确定金矿的变形历史和金成矿作用。在中川地区已经认识到变形的三个主要阶段。第一个变形（D1 ）事件大致沿N–S方向受压，第二个（D2 ）事件也沿NE-SW方向受压并定向，第三个（D3 ）事件发生在矿化后，并与裸露方解石和硬石膏脉的位置有关。与D2有关的压缩是控制Liba金矿区火成岩分布和金矿化的关键过程。火成岩流体和热液都在D2晚期发生局部扩展的情况下，优先沿着扩张慢动集中。锆石上高分辨率离子微探针（SHRIMP）U–Pb的精确约会，白云母，黑云母，角闪石和横切矿化前花岗岩化斑岩和闪长岩脉的斜长石具有40 Ar / 39 Ar将成矿年龄限制在约227马。对与金矿化有关的热液蚀变带中形成的矿物进行40 Ar / 39 Ar的分析表明，大约有一个广泛的Ca。 216 Ma热液事件影响了该地区几乎所有岩性。这项详细的研究是首次严格限制WQO中金矿化时间的研究。矿化和火成岩的广泛重叠的时间和类似的结构控制显示出令人鼓舞的相关性，这可潜在地用于绘制WQO中的晚三叠世金矿化事件。

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  • 来源
    《Mineralium Deposita》 |2012年第7期|p.799-819|共21页
  • 作者

    Qingtao Zeng; T. Campbell McCuaig; Craig J. R. Hart; Fred Jourdan; Janet Muhling; Leon Bagas;

  • 作者单位

    Center for Exploration Targeting, School of Earth and Environment, University of Western Australia, Perth, WA, 6009, Australia;

    Center for Exploration Targeting, School of Earth and Environment, University of Western Australia, Perth, WA, 6009, Australia;

    Mineral Deposit Research Unit, University of British Columbia, Vancouver, BC, 6339, Canada;

    Western Australian Argon Isotope Facility, Department of Applied Geology and JdL-CMS, Curtin University, GPO Box U1987, Perth, WA, 6845, Australia;

    Center for Microscopy, Characterisation and Analysis, University of Western Australia, Crawley, WA, 6009, Australia;

    Center for Exploration Targeting, School of Earth and Environment, University of Western Australia, Perth, WA, 6009, Australia;

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  • 正文语种 eng
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  • 关键词

    Geochronology; Gold mineralization; Liba goldfield; Qinling Orogen; China;

    机译：地质年代学;金矿化;李坝金矿田;秦岭造山带;

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