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Petrogenesis of Scheelite-Bearing Albitite as an Indicator for the Formation of a World-Class Scheelite Skarn Deposit: A Case Study of the Zhuxi Tungsten Deposit
Economic Geology ( IF 5.8 ) Pub Date : 2021-01-01 , DOI: 10.5382/econgeo.4771
Shiwei Song 1 , Jingwen Mao 1 , Guiqing Xie 1 , Wei Jian 1 , Guohua Chen 2 , Jianfeng Rao 2 , Yongpeng Ouyang 2
Affiliation  

Scheelite-bearing albitite is present in the form of rare, highly fractionated felsic dikes in the world-class Zhuxi tungsten deposit. Morphologically, the Zhuxi albitite forms individual dikes with thicknesses from 0.01 to 5.1 m in the orebodies. Additionally, the Zhuxi albitite is characterized by high sodium concentrations (Na2O = 6.08–8.04 wt %), low silicon (SiO2 = 56.81–62.56 wt %) and potassium concentrations (K2O = 1.44–2.62 wt %), and increasing P2O5 (0.1–0.7 wt %), Y (2.72–8.62 ppm), and rare earth element (8.28–28.89 ppm) concentrations from the tops to the bottoms of the dikes, which are controlled by the heterogeneous distribution of apatite grains in the albitite.The trace element geochemical characteristics and Sr-Nd isotope compositions of the albitite and the geochemistry of plagioclase, muscovite, apatite, and scheelite that formed in both the albitite and ore-related (altered) granites strongly suggest a genetic relationship between the two rocks. Given our new data and previous experimental data, as well as natural examples from around the world, we propose that the Zhuxi albitite is the product of a silicate-poor, H2O-rich melt that formed by melt–melt-liquid immiscibility processes in an extremely fractionated residual magma. A deep-seated (>3 kbar) granitic magma reservoir was directly related to the formation of these rare scheelite-bearing albitite dikes.Albitite dikes are the product of extreme fractionation of a granitic magma, and W is highly incompatible during magma evolution regardless of oxygen fugacity; therefore, intense tungsten mineralization development within albitite dikes should serve as an important criterion for judging the tungsten metallogenic potential.

中文翻译:

含白云母的方铁矿的成岩作用作为世界一流的白钨矿矽卡岩型矿床形成的指标:以竹溪钨矿床为例

含白钨矿的方铁矿以稀有的,高度分级的长英质堤坝的形式存在于世界一流的竹溪钨矿床中。从形态上讲,竹溪方铁矿在矿体中形成厚度为0.01至5.1 m的单个堤防。此外,竹溪的方铁矿还具有高钠浓度(Na 2 O = 6.08–8.04 wt%),低硅(SiO 2 = 56.81–62.56 wt%)和钾浓度(K 2 O = 1.44–2.62 wt%)的特征,和增加P 2 O 5堤坝顶部到底部的铅含量(0.1-0.7 wt%),Y(2.72-8.62 ppm)和稀土元素(8.28-28.89 ppm)浓度受白云母中磷灰石晶粒的不均匀分布控制白云母的微量元素地球化学特征和Sr-Nd同位素组成以及在白云母和与矿石相关(改变)的花岗岩中形成的斜长石,白云母,磷灰石和白钨矿的地球化学强烈暗示了这两个岩石之间的遗传关系。根据我们的新数据和之前的实验数据,以及来自世界各地的自然实例,我们建议竹溪方钠石是硅酸盐含量低的H 2的产物。富氧熔体是由熔融-熔体-液体不混溶过程在极度分离的残留岩浆中形成的。深部(> 3 kbar)的花岗岩岩浆储集层与这些稀有的含白钨矿的方铁石岩的形成直接相关。方石岩岩是花岗岩岩浆极端分馏的产物,无论其在岩浆演化过程中与W高度不相容氧逸度 因此,在方铁石堤内强烈的钨矿化发展应作为判断钨成矿潜力的重要标准。
更新日期:2021-02-18
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