当前位置：
X-MOL 学术
›
Geolog. J.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Petrogenesis and ore potential of Permian mafic intrusions in the Dacaotan area, eastern Tianshan: Constraints from whole‐rock platinum‐group element contents and Sr–Nd isotopes
Geological Journal ( IF 1.4 ) Pub Date : 2020-09-17 , DOI: 10.1002/gj.3999 Ming‐Hao Ren 1 , Li‐Li Liu 1 , Zhi‐Quan Huang 1
Geological Journal ( IF 1.4 ) Pub Date : 2020-09-17 , DOI: 10.1002/gj.3999 Ming‐Hao Ren 1 , Li‐Li Liu 1 , Zhi‐Quan Huang 1
Affiliation
|
The eastern Tianshan is an important Ni–Cu mineralization belt that contains several ore‐bearing mafic–ultramafic intrusions. The eastern part of this belt has been well studied, whereas the western part is poorly studied. Here, we present studies of two mafic intrusions (DC3 and DC4) from the Dacaotan area in the western part of the eastern Tianshan. The gabbrosof the DC3 and DC4 intrusions contain plagioclase and clinopyroxene, and are characterized by light rare earth element enrichment, negative Nb anomalies, depleted platinum group element contents, high and variable Cu/Pd ratios, positive εNd (6.0–7.5) values, and low initial 87Sr/86Sr ratios (0.7033–0.7036). The two intrusions have geochemical affinities with intrusions in the Huangshan area, despite mineralogical differences, with orthopyroxene and amphibole being present in the Huangshan intrusions. The two studied mafic intrusions formed from a high‐Mg basaltic magma derived from anhydrous and depleted mantle. Due to the low degree (<8%) of partial melting, the magma was PGE‐depleted and sulphide remained in the mantle source. The PGE contents were further depleted by early magmatic sulphide segregation. Given the limited contamination (<10%) by the upper crust and coeval A‐type granites, these two intrusions have poor potential for Ni–Cu sulphide mineralization.
中文翻译：
天山东部大草滩地区二叠系铁镁质岩浆岩的成因和矿床潜力：全岩铂族元素含量和Sr-Nd同位素的制约
天山东部是重要的镍铜矿化带，其中包含数个含铁的镁铁质超音波侵入岩。该带的东部已被很好地研究，而西部则缺乏研究。在这里，我们目前研究的是来自天山东部西部大草滩地区的两个镁铁质侵入岩（DC3和DC4）。DC3和DC4侵入体的辉长岩含有斜长石和斜辉石，其特征是轻稀土元素富集，负Nb异常，贫化的铂族元素含量，高/可变的Cu / Pd比，正εNd（6.0-7.5）值和初始低87 Sr / 86锶比（0.7033–0.7036）。尽管矿物学上存在差异，但这两个侵入体在地球化学上都与黄山地区的侵入体具有相似性，黄山侵入体中存在邻苯二酚和闪石。这两个研究是由高镁玄武岩浆形成的镁铁质侵入体，该岩浆来自无水和贫化的地幔。由于部分融化的程度较低（<8％），岩浆贫化了PGE，地幔源中仍残留有硫化物。早期岩浆硫化物的偏析使PGE的含量进一步减少。鉴于上地壳和同时期的A型花岗岩的污染程度有限（<10％），这两个侵入体对镍铜硫化物矿化的潜力很低。
更新日期：2020-09-17
中文翻译：
天山东部大草滩地区二叠系铁镁质岩浆岩的成因和矿床潜力：全岩铂族元素含量和Sr-Nd同位素的制约
天山东部是重要的镍铜矿化带，其中包含数个含铁的镁铁质超音波侵入岩。该带的东部已被很好地研究，而西部则缺乏研究。在这里，我们目前研究的是来自天山东部西部大草滩地区的两个镁铁质侵入岩（DC3和DC4）。DC3和DC4侵入体的辉长岩含有斜长石和斜辉石，其特征是轻稀土元素富集，负Nb异常，贫化的铂族元素含量，高/可变的Cu / Pd比，正εNd（6.0-7.5）值和初始低87 Sr / 86锶比（0.7033–0.7036）。尽管矿物学上存在差异，但这两个侵入体在地球化学上都与黄山地区的侵入体具有相似性，黄山侵入体中存在邻苯二酚和闪石。这两个研究是由高镁玄武岩浆形成的镁铁质侵入体，该岩浆来自无水和贫化的地幔。由于部分融化的程度较低（<8％），岩浆贫化了PGE，地幔源中仍残留有硫化物。早期岩浆硫化物的偏析使PGE的含量进一步减少。鉴于上地壳和同时期的A型花岗岩的污染程度有限（<10％），这两个侵入体对镍铜硫化物矿化的潜力很低。
京公网安备 11010802027423号