Tourmaline from the Archean GRHalli gold deposit, Chitradurga greenstone belt, Dharwar craton (India): Implications for the gold metallogeny

被引：12
作者：
Gupta, Susmita [1 ]
Jayananda, M. [2 ]
Fareeduddin [3 ]
机构：
[1] Geol Survey India, NER, Gauhati 781005, Assam, India
[2] Univ Delhi, Dept Geol, Ctr Adv Studies, Delhi 110007, India
[3] Geol Survey India, Geochronol & Isotope Geol Div, Kolkata 700016, W Bengal, India
来源：
GEOSCIENCE FRONTIERS | 2014年 / 5卷 / 06期
关键词：
Archean; Dharwar craton; G.R.Halli; Orogenic gold deposit; Tourmaline;
D O I：
10.1016/j.gsf.2013.12.004
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Tourmaline occurs as a minor but important mineral in the alteration zone of the Archean orogenic gold deposit of Guddadarangavanahalli (G.R.Halli) in the Chitradurga greenstone belt of the western Dharwar craton, southern India. It occurs in the distal alteration halo of the G.R.Halli gold deposit as (a) clusters of very fine grained aggregates which form a minor constituent in the matrix of the altered metabasalt (AMB tourmaline) and (b) in quartz-carbonate veins (vein tourmaline). The vein tourmaline, based upon the association of specific carbonate minerals, is further grouped as (i) albite-tourmaline-ankerite-quartz veins (vein-1 tourmaline) and (ii) albite-tourmaline-calcite-quartz veins (vein-2 tourmaline). Both the AMB tourmaline and the vein tourmalines (vein-1 and vein-2) belong to the alkali group and are classified under schorl-dravite series. Tourmalines occurring in the veins are zoned while the AMB tourmalines are unzoned. Mineral chemistry and discrimination diagrams reveal that cores and rims of the vein tourmalines are distinctly different. Core composition of the vein tourmalines is similar to the composition of the AMB tourmaline. The formation of the AMB tourmaline and cores of the vein tourmalines are proposed to be related to the regional D-1 deformational event associated with the emplacement of the adjoining ca. 2.61 Ga Chitradurga granite whilst rims of the vein tourmalines vis-a-vis gold mineralization is spatially linked to the juvenile magmatic accretion (2.56-2.50 Ga) east of the studied area in the western part of the eastern Dharwar craton. (C) 2014, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. All rights reserved.
引用
收藏
页码：877 / 892
页数：16
相关论文
共 64 条
[1]  
Kumar A., Rao B., Sivaraman Y.J., Gopalan K., Sm-Nd ages of Archean metavolcanics of the Dharwar craton, South India, Precambrian Research, 80, pp. 205-216, (1996)
[2]  
Barnicoat A.C., Fare R.J., Groves D.I., McNaughton N.J., Synmetamorphic lode-gold deposits in high-grade Archean settings, Geology, 19, pp. 921-924, (1991)
[3]  
Bhaskar Rao Y.J., Sivaraman T.V., Pantulu C.V.C., Gopalan K., Naqvi S.M., Rb-Sr ages of late Archean metavolcanics and granites, Dharwar craton, south India and evidence for early Proterozoic thermotectonic event(s), Precambrian Research, 59, pp. 145-170, (1992)
[4]  
Cameron E.M., Archean gold: Relation to granulite formation and redox zoning in the crust, Geology, 16, pp. 109-112, (1988)
[5]  
Cavarrette G., Puxedda M., Schorl-dravite-ferridravite tourmaline deposited by hydrothermal magmatic fluids during early evolution of the Larderello geothermal field, Italy, Economic Geology, 85, pp. 1236-1251, (1990)
[6]  
Chadwick B., Vasudev V.N., Hegde G.V., The Dharwar craton, southern India and its late Archean Plate Tectonic settings: Current interpretations and controversies, Proceedings of the Indian Academy of Sciences: Earth and Planetary Sciences, 106, 4, pp. 249-258, (1997)
[7]  
Chadwick B., Vasudev V.N., Hegde G.V., The Dharwar craton, southern India interpreted as a result of Late Archean oblique convergence, Precambrian Research, 99, pp. 91-111, (2000)
[8]  
Chadwick B., Vasudev V.N., Hegde G.V., Nutman A.P., Structure and SHRIMPU/Pb zircon ages of granites adjacent to the Chitradurga Schist Belt: Implications for Neoarchean convergence in the Dharwar craton, southern India, Geological Society of India, 69, pp. 5-24, (2007)
[9]  
Chardon D., Jayananda M., Three dimensional field perspective on deformation, flow and growth of the lower continental crust (Dharwar craton, India), Tectonics, 27, (2008)
[10]  
Chardon D., Jayananda M., Peucat J.J., Lateral constrictional flow of hot orogenic crust: Insights from the Neoarchean of south India, geological and geophysical implications for orogenic plateaux, Geochemistry Geophysics Geosystems, 12, pp. 1-24, (2011)
1234567