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首页> 外文期刊>Lithos: An International Journal of Mineralogy, Petrology, and Geochemistry >Geochronology, geochemistry, and Sr-Nd-Hf isotopic compositions of mafic-ultramafic intrusions in the Niubiziliang Ni-(Cu) sulfide deposit, North Qaidam Orogenic Belt, NW China: Implications for magmatic source, geodynamic setting, and petrogenesis
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Geochronology, geochemistry, and Sr-Nd-Hf isotopic compositions of mafic-ultramafic intrusions in the Niubiziliang Ni-(Cu) sulfide deposit, North Qaidam Orogenic Belt, NW China: Implications for magmatic source, geodynamic setting, and petrogenesis

机译：Niubiziliang Ni-（Cu）硫化物沉积物，北柴达木造山带，NW中国的地质学，地球化学和SR-ND-HF同位素组成，NW中国：Magmatic源，地球动力学环境和化纤的影响

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Whole-rock geochemical and Sr-Nd isotopic data, and zircon U-Pb-Hf isotopic data are reported for mafic-ultramafic intrusions in the Niubiziliang Ni-(Cu) sulfide deposit, located in the westernmost segment of the North Qaidam Orogenic Belt (NQOB), NW China. Ni-Cu sulfide ores of economic interest are found within these intrusions, with the Niubiziliang III and IV intrusions hosting most of the Ni-(Cu) mineralization. The Niubiziiang mafic-ultramafic intrusions intrude biotite-plagioclase gneiss of the Paleoproterozoic Dakendaban Group. Zircons separated from the gabbro, plagioclase-bearing clinopyroxenite, and olivine websterite yield U-Pb ages of 389 +/- 2, 373 +/- 2, and 380 +/- 2 Ma, respectively, indicating a genetic linkage with Middle-Late Devonian regional magmatism (390-370 Ma). Gabbro zircons have EHf(t) values of 4.2-10.9 with older T-DM1 ages (0.86-0.59 Ga). The Niubiziliang intrusions contain many xenoliths of Paleoproterozoic biotite-plagioclase gneiss, and the intrusions have similar trace element patterns with strong enrichment in LILEs (e.g., K, Rb, and Th) and moderate depletion in HFSEs (e.g., Nb, Ta, P, and Ti). The major and trace element characteristics, and Sr-Nd-Hf isotopic compositions indicate the parental magmas originated from a metasomatized, asthenospheric mantle source that had previously been modified by subduction-related fluids. The magmas experienced significant crustal contamination both in the magma chamber and during ascent, triggering sulfur over-saturation that resulted in the deposition and enrichment of sulfides. Considering the tectonic evolution of this region, we infer that the Niubiziliang mafic-ultramafic intrusions formed in a post-collisional extensional setting related to delamination of the subcontinental lithosphere. (C) 2018 Elsevier B.V. All rights reserved.
机译：据北津丛Ni-（Cu）硫化物矿床中的乳头型超空白入侵，位于北柴达木的最西部造山带（Cu）硫化物矿床（ NQOB），NW中国。在这些侵犯中发现了Ni-Cu硫化物矿物，在这些侵犯中发现，Niubiziliang III和IV侵入载体大多数Ni-（Cu）矿化。 Niubiziiang Mafic-Ultramafic Intrings intrude Biotite-Plagioclase肺酸盐胶囊古典型古典型的Dakendaban组。锆石分离出Gabbro，Plagioclase的Closocexite和橄榄石韦伯特分别产生389 +/- 2,373 +/- 2和380 +/- 2 mA的U-Pb Ag，表明遗传联系到中期德文郡地区岩浆大学（390-370 MA）。 Gabbro Zircons具有4.2-10.9的EHF（T）值，具有较旧的T-DM1年龄（0.86-0.59 GA）。 Niubiziliang Intrunions含有许多古普罗古古思岩 - Plagioclase片状蛋白质，并且侵入性具有相似的痕量元素图案，其具有相似的浓缩植物（例如，K，Rb和Th）和中等耗尽在HFSE中（例如，Nb，Ta，P，和ti）。主要和痕量元素特征和SR-Nd-HF同位素组合物表示源自介质相关的潜水型流体的源化的哮喘的伴随的哮喘的岩石源。岩浆在岩浆室内和上升期间经历了显着的地壳污染，触发硫的过饱和，导致硫化物沉积和富集。考虑到该地区的构造演变，我们推断Niubiziliang Mafic-ultramfiC入侵，形成与亚平庸的岩石圈的分层相关的碰撞延伸范围。 （c）2018 Elsevier B.v.保留所有权利。

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