Age, petrogenesis and tectonic significance of the ferrobasalts in the Chagangnuoer iron deposit, western Tianshan
Age, petrogenesis and tectonic significance of the ferrobasalts in the Chagangnuoer iron deposit, western Tianshan
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西天山查岗诺尔铁矿床铁玄武岩的时代、岩石成因及构造意义
DOI：
10.1080/00206814.2015.1004136
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发表时间：
2015-02
影响因子：
2.6
通讯作者：
Yang, Wu-Bin
中科院分区：
文献类型：
--
作者：
Yan, Shuang;Yan, Shuang;Yang, Wu-Bin;Yang, Wu-Bin
与俯冲作用有关的大型铁矿床的形成及其与铁玄武岩的成因关系尚未得到很好的理解。本文对西天山查岗诺尔铁矿存款中新发现的铁基玄武岩进行了地球化学和年代学研究。查岗诺尔铁玄武岩以高Fe_2 O_3 T（14.55- 22.68wt.%）为特征。和MnO（0.36-0.93重量%）但低TiO 2（0.70-1.26重量%）内容.对10个锆石颗粒进行了U-Pb加权年龄测定，结果为314 ± 8 Ma。根据我们新的岩石学和地球化学数据，我们认为查岗诺尔铁基玄武岩可能起源于部分熔融的尖晶石橄榄岩地幔源，已被俯冲相关的流体修改。铁基玄武岩中MnO与（87 Sr/86 Sr）i呈近似线性正相关关系，反映了俯冲铁锰结核的参与。洋中脊玄武岩（MORB）和洋岛玄武岩（OIB）的地球化学特征，以及适度的Ti/V值（18-36），表明铁玄武岩可能已形成在拉张弧后盆地环境。结合前人对查岗诺尔铁矿存款的研究，提出了上覆铁矿体可能来源于铁玄武岩浆的假说。
The formation of large iron deposits associated with subduction and its genetic relationships with ferrobasalts are not yet well understood. Here we report a geochemical and geochronological investigation on the newly discovered ferrobasalts associated with the Chagangnuoer iron deposit, western Tianshan. The Chagangnuoer ferrobasalts are characterized by high Fe2O3T (14.55–22.68 wt.%) and MnO (0.36–0.93 wt.%) but low TiO2 (0.70–1.26 wt.%) contents. Analyses of 10 zircon grains yield a weighted zircon U–Pb age of 314 ± 8 Ma. Based on our new petrological and geochemical data, we conclude that the Chagangnuoer ferrobasalts probably have been originated from the partial melting of a spinel peridotite mantle source that has been modified by subduction related fluids. The ferrobasalts have nearly linear positive correlation between MnO and (87Sr/86Sr)i, implying the involvement of subducted Fe–Mn nodules. The mid-ocean ridge basalt (MORB)- and ocean island basalt (OIB)-like geochemical features, as well as moderate Ti/V values (18–36), indicate that the ferrobasalts may have been formed in an extensional back-arc basin setting. Combined with previous studies on the Chagangnuoer iron deposit, we propose a hypothesis that the overlying iron orebodies were likely derived from the ferrobasaltic magma.
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影响因子：
3.5
作者：
R. Kerrich;A. Polat;Q. Xie
通讯作者：
R. Kerrich;A. Polat;Q. Xie
影响因子：
--
作者：
Shijin Xu;Z. Fang;T. Matsumoto;J. Matsuda;M. Yasuda;Jinhai Yu;Rucheng Wang;Wen-zhao Liu
通讯作者：
Shijin Xu;Z. Fang;T. Matsumoto;J. Matsuda;M. Yasuda;Jinhai Yu;Rucheng Wang;Wen-zhao Liu
西天山敦德铁锌矿床地质、地球化学及年代学
影响因子：
3.3
作者：
Zhao Jun;Zhang Yongping;Li Fengming;Tian Jingquan
通讯作者：
Tian Jingquan
DOI：
--
发表时间：
2002
期刊：
--
影响因子：
--
作者：
W. Gang
通讯作者：
W. Gang
影响因子：
5.8
作者：
R. Larson
通讯作者：
R. Larson