Occurrence of paragonite in the hydrothermalwall rock alteration zone of G. R. Halli gold deposit, Chitradurga Schist Belt, Western Dharwar Craton, Southern India

被引：2
作者：
Gupta S. [1 ]
Fareeduddin [2 ]
机构：
[1] Geological Survey of India (GSI), NER
[2] GSI, PPOD Division, Kumaraswamy Layout
来源：
Journal of the Geological Society of India | 2013年 / 82卷 / 5期
关键词：
Archaean; Dharwar craton; G; R; Halli; Gold mineralization; Karnataka; Paragonite; Wall rock alteration;
D O I：
10.1007/s12594-013-0177-5
中图分类号：
学科分类号：
摘要：
Paragonite (NaAl2Si3AlO10(OH) 2), a dioctahedral sodium mica, occurs as a minor phase in the wall rock alteration assemblage of the Guddadarangavanahalli (G. R. Halli) gold deposit of Western Dharwar Craton, Karnataka. It occurs as colourless to pale yellowish grains and scaly aggregates in chlorite, ankerite and quartz rich matrix of the altered metabasalt. Its presence is noticed in the distal to near proximal wall rock alteration zone, mainly in the southern part of the G. R. Halli gold deposit. Presence of paragonite is identified by X-Ray Diffraction (XRD) and Electron Probe Micro-Analyzer (EPMA) studies. The Na2O content of the paragonite varies between 5.96 wt% and 7.8 wt% whereas K 2O ranges from 0.44-2.68 wt%. Al2O3 is measured between 37.73 wt% and 39.72 wt% whereas SiO2 varies from 45.06-47.19 wt%. The relative proportion of Na and K in paragonite varies between Na 96K4 and Na77K23. The occurrence of paragonite in the wall rock alteration halo of the G. R. Halli gold deposit is proposed as a result of hydrolysis of metamorphosed plagioclase feldspars during the interaction of the hydrothermal fluids and the wall rock. © 2013 Geological Society of India.
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页码：461 / 473
页数：12
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