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首页> 外文期刊>Journal of Asian earth sciences >Clayey bauxite from the Irano-Himalayan belt: Critical metals, provenance and palaeoclimate in the Upper Cretaceous Semirom ore deposit, Zagros Mountain, Iran
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Clayey bauxite from the Irano-Himalayan belt: Critical metals, provenance and palaeoclimate in the Upper Cretaceous Semirom ore deposit, Zagros Mountain, Iran

机译：伊朗-喜马拉雅带的粘土铝土矿：伊朗扎格罗斯山上白垩统塞勒姆矿床中的关键金属，物源和古气候

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摘要

The Semirom karst type clayey bauxite is located in the Zagros zone, a part of the Irano-Himalayan belt, and occurs between the Sarvak and Ilam Formations. The Albian to Cenomanian limestone bedrock of the Sarvak Fm is a part of a platform ramp environment including clay bearing components. Diaspore, boehmite, kaolinite, and hematite are the major ore-forming minerals. Elemental mobility determinations reveal that Th and the critical metals Co, Ni, and Cr are enriched in the bauxitic horizons relatively to the Upper Continental Crust. Further, only one sample is outlier for more than one critical metal (Cr, Co, Ni, and Ga) likely recording a specific event during bauxitization. The outlier is enriched in Ni, Co, Ga, and Th, is depleted in Cr, and shows a large positive Ce anomaly (Ce/Ce* = 3.03). The outlier may record an event characterized by more acidic and oxidizing conditions and may have a regional relevance. R-mode factor analysis suggests that Cr and Co are likely adsorbed onto oxy-hydroxides probably in horizons also concentrating secondary phosphates hosting HREE and Th. Nickel is instead likely adsorbed onto titanium oxides which concentrate in the pool of highly insoluble detrital phases also including zircon whereas diaspore and boehmite are important in controlling both Ga and LREE. The low contents of Ni and Cr associated to the Semirom clayey bauxite exclude a provenance from a mafic protolith. Further, most of the samples have Eu/Eu* values close to those observed in the Sarvak Fm marly limestone, suggesting that the clayey component within the underlying limestone acted as protolith. The oxygen and hydrogen isotopic composition of the kaolinite-rich separates from the Semirom deposit indicates temperature never lower than 30 degrees C, supporting the idea of the Zagros basin close to the equator during the Cenomanian-Turonian under a warm and humid tropical climate with heavy rainfall.
机译：Semirom喀斯特型黏土型铝土矿位于Zagros地带（伊朗-喜马拉雅带的一部分），位于Sarvak和Ilam地层之间。 Sarvak Fm的Albian至Cenomanian石灰岩基岩是平台坡道环境的一部分，其中包括黏土成分。硬岩，勃姆石，高岭石和赤铁矿是主要的成矿矿物。元素迁移率测定表明，相对于上地壳，Th和关键金属Co，Ni和Cr在铝土层中富集。此外，对于一种以上的可能会在铝土化过程中记录特定事件的关键金属（Cr，Co，Ni和Ga），只有一个样本存在异常值。离群值富含Ni，Co，Ga和Th，Cr贫乏，并且显示出较大的正Ce异常（Ce / Ce * = 3.03）。离群值可能会记录一个事件，该事件的特征是酸性和氧化性更高，并且可能具有区域相关性。 R-模式因子分析表明，Cr和Co可能会吸附到羟基氧化物上，也可能会浓缩含有HREE和Th的仲磷酸盐。取而代之的是，镍很可能会吸附到钛氧化物上，而钛氧化物会集中在高度不溶的碎屑相池中，包括锆石，而透水石和勃姆石对控制Ga和LREE都很重要。与Semirom黏土铝土矿相关的Ni和Cr含量低，使镁铁质原石不具有任何来源。此外，大多数样品的Eu / Eu *值均接近于Sarvak Fm灰质石灰岩中观察到的值，这表明下面的石灰岩中的粘土成分起着原生石的作用。富含高岭石和Semirom矿床的氧和氢同位素组成表明温度从不低于30摄氏度，这支持了Zagros盆地在暖暖湿润的热带气候下，在塞诺曼尼亚-土伦时代靠近赤道的想法。雨量。

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