Metallogeny and tectonomagmatic setting of Ni-Cu magmatic sulfide mineralization, number I Shitoukengde mafic-ultramafic complex, East Kunlun Orogenic Belt, NW China
Metallogeny and tectonomagmatic setting of Ni-Cu magmatic sulfide mineralization, number I Shitoukengde mafic-ultramafic complex, East Kunlun Orogenic Belt, NW China
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东昆仑造山带石头坑德一号镁铁质-超镁铁质杂岩镍铜岩浆硫化物成矿及构造岩浆背景
DOI：
10.1016/j.oregeorev.2018.04.027
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发表时间：
2018-05
影响因子：
3.3
通讯作者：
Jun Dong
中科院分区：
文献类型：
--
作者：
Zhao-Wei Zhang;Ya-Lei Wang;Bing Qian;Yue-Gao Liu;Da-Yu Zhang;Peng-Rui Lü;Jun Dong
I号石头坑德镁铁-超镁铁杂岩体位于东昆仑造山带（EKOB）东部。它包括橄榄岩（纯橄榄岩和二辉橄榄岩）、橄榄石韦氏辉石、辉石岩（韦氏辉石和单斜辉石）和辉长岩。镍铜硫化物矿化赋存于橄榄岩和橄榄石韦斯特岩中。锆石SHRIMP U-Pb同位素分析显示，橄榄石网沸石的早石炭世年龄为333.9±4.2Ma，辉长岩的志留纪年龄为424.7±3.7Ma。根据这些资料和区域构造环境，我们推测东昆仑地区的I号石头坑德超镁铁岩是在古特提斯洋打开时形成的。这种地质环境与 EKOB 中夏日哈木镍钴矿床 (411Ma) 的地质环境有很大不同，该矿床是在碰撞后环境中形成的。橄榄岩（纯橄榄岩和二辉橄榄岩）和橄榄石网沸石的全岩 Ni 含量与 FeO 含量呈负相关，与橄榄石中 MgO 和 Fo 含量呈正相关，表明观测岩石母岩浆的分异结晶在硫化物饱和过程中并未发挥作用。高Ni含量的超镁铁质岩石，即橄榄岩和橄榄石韦斯特岩，其(87Sr/86Sr)i值较低，表明地壳污染程度较低。镍浓度较低的超镁铁质岩石与未矿化的大理岩围岩接触。我们认为，大理岩的同化降低了岩浆中硫化物的溶解度，从而产生了 I 号石头坑德杂岩。超镁铁质岩中石头坑德硫化物的δ34S值范围为1.9～4.3‰，平均值为2.9‰，表明岩浆中添加了地壳硫。在围岩中，仅在金水口群片麻岩中发现少量硫化物。因此，石头坑德I号超镁铁岩很可能受到片麻岩中的一些硫的污染。我们认为石头坑德Ⅰ号杂岩中最有前景的超镁铁岩段毗邻片麻岩围岩。
The number I Shitoukengde mafic-ultramafic complex is located in the eastern part of the East Kunlun Orogenic Belt (EKOB). It comprises peridotite (dunite and lherzolite), olivine websterite, pyroxenite (websterite and clinopyroxenite), and gabbro. The Ni-Cu sulfide mineralization is hosted in the peridotite and olivine websterite. Zircon SHRIMP U-Pb isotopic analyses reveal an early Carboniferous age of 333.9 ± 4.2 Ma for the olivine websterite and a Silurian age of 424.7 ± 3.7 Ma for the gabbro. Based on these data and the regional tectonic setting, we suggest that the number I Shitoukengde ultramafic rocks formed during the opening of the Paleotethys Ocean in the East Kunlun area. This geological setting is quite different than that of the Xiarihamu Ni-Co deposit (411 Ma) in the EKOB, which formed in a post-collisional environment. The whole-rock Ni contents of the peridotite (dunite and lherzolite) and olivine websterite are negatively correlated with the FeO contents and positively correlated with the MgO and Fo contents of the olivine, indicating that fractional crystallization of the parent magma of the observed rocks did not play a role in the sulfide saturation process. The ultramafic rocks with high Ni contents, i.e., the peridotite and olivine websterite, have low (87Sr/86Sr)ivalues, indicating low degrees of crustal contamination. The ultramafic rocks with lower Ni concentrations are in contact with the unmineralized marble country rock. We suggest that the assimilation of marble decreased the sulfide solubility of the magmas that produced the number I Shitoukengde complex. The δ34S values of the Shitoukengde sulfide hosted in the ultramafic rocks range from 1.9 to 4.3‰, with an average value of 2.9‰, indicating that crustal sulfur was added to the magma. In the country rocks, we found minor amounts of sulfide only in the gneiss from the Jinshuikou Group. Therefore, the number I Shitoukengde ultramafic rocks were probably contaminated with some sulfur from the gneiss. We propose that the most prospective ultramafic segments of the number I Shitoukengde complex are adjacent to gneissic country rocks.
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影响因子：
5.8
作者：
J. Lehmann;N. Arndt;B. Windley;Mei‐Fu Zhou;C. Wang;C. Harris
通讯作者：
J. Lehmann;N. Arndt;B. Windley;Mei‐Fu Zhou;C. Wang;C. Harris
藏北高原东昆仑造山带中泥盆世基性岩脉年代学和地球化学：对原特提斯造山运动向古特提斯造山运动过渡的启示
DOI：
10.1016/j.chemer.2013.07.004
发表时间：
2014-06
期刊：
Chemie der Erde
影响因子：
--
作者：
Changqian Ma;Hongan Jiang;Bin Liu;Jian Huang
通讯作者：
Jian Huang
DOI：
--
发表时间：
2013
期刊：
Acta Geological Sinica
影响因子：
--
作者：
Chen Guocha
通讯作者：
Chen Guocha
DOI：
--
发表时间：
2011-12
期刊：
--
影响因子：
--
作者：
X. Mo;Z. Luo;J. Deng;X. Yu;C. Liu;W. Yuan;X. Bi
通讯作者：
X. Mo;Z. Luo;J. Deng;X. Yu;C. Liu;W. Yuan;X. Bi
影响因子：
1.8
作者：
Ma Chang
通讯作者：
Ma Chang