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Carbonate hosted intermetallic compounds in Paleoproterozoic Salumber Ghatol metallogenic belt, Aravalli Craton, Rajasthan, India
Journal of Earth System Science ( IF 1.3 ) Pub Date : 2020-06-09 , DOI: 10.1007/s12040-020-01410-3
Suresh Chander , Ausaf Raza , Santanu Bhattacharjee , Sanjay Das

Carbonate hosted intermetallic compound in the Umarvaniyan area is localized within the intensively sheared (mylonitised) dolomite in a NW–SE shear zone (~15 km), belongs to Salumber Ghatol metallogenic belt, in Debari Group of Aravalli Craton, Rajasthan, India. It is characterized by extensive silicification and ferruginisation with hematite, goethite, magnetite and native gold specks. The intermetallic compound within the dolomite is composed of varying proportion of Cu–Zn–Ni–Os–Fe which has been detected by electron probe microanalysis (EPMA) study. The EMPA (WDS) results of the intermetallic compounds also reveal occurrences of intermetallic compounds of Cu–Zn–Ni–Os–Fe and native Au. The occurrence of these non-separable compounds is probably because these metals were formed at very high temperatures and in reducing condition during the evolving shear with low oxygen and low sulfur fugacity. The fast cooling effect thereafter probably made the geochemical environment least conducive for reaction between Cu/Zn/Ni and sulphur or oxygen.



中文翻译:

印度拉贾斯坦邦Aravalli Craton的古元古代Salumber Ghatol成矿带中碳酸盐中的金属间化合物

Umarvaniyan地区含碳酸盐的金属间化合物位于NW–SE剪切带(约15 km)的强烈剪切(长丝状)白云岩中​​,属于印度拉贾斯坦邦Aravalli Craton Debari组的Salumber Ghatol成矿带。它的特征是与赤铁矿,针铁矿,磁铁矿和天然金斑点进行广泛的硅化和铁素化。白云岩中的金属间化合物由不同比例的Cu-Zn-Ni-Os-Fe组成,这已通过电子探针显微分析(EPMA)研究检测到。金属间化合物的EMPA(WDS)结果还揭示了Cu-Zn-Ni-Os-Fe和天然Au的金属间化合物的出现。这些不可分离的化合物的出现可能是因为这些金属是在高温和低氧,低硫逸度的剪切过程中在还原条件下形成的。此后的快速冷却作用可能使地球化学环境最不利于Cu / Zn / Ni与硫或氧之间的反应。

更新日期:2020-06-09
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