Fluid inclusion characteristics of the Uti gold deposit, Hutti-Maski greenstone belt, southern India

被引:31
|
作者
Mishra, B [1 ]
Pal, N
Sarbadhikari, AB
机构
[1] Indian Inst Technol, Dept Geol & Geophys, Kharagpur 721302, W Bengal, India
[2] Reliance Ind Ltd, E&P Petr DAKC, Bombay 400709, Maharashtra, India
关键词
gold mineralization; fluid inclusions; hydrothermal alteration; Ca-Al silicates; Hutti-Maski;
D O I
10.1016/j.oregeorev.2004.10.002
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
The Uti gold deposit occurs within amphibolites of the late Archaean Hutti-Maski greenstone belt of southern India. Gold mineralization is associated with intense silicification, biotite-actinolite- and sulfide-rich alteration zones in between small anastomozing shear zones. Characteristic biotite-K-feldspar alteration and arsenopyrite thermometry constrain the mineralizing event to above 400 degrees C, which is concordant with evidence of dynamic recrystallization in mineralized quartz veins. Shearing, concomitant alteration and Au-mineralization took place at post-peak metamorphic conditions. A post-mineralization, sub-greenschist facies assemblage of prehnite/pumpellyite and hydrogamet later imprinted the rocks. Fluid inclusion micro-thermometric studies on mineralized and barren quartz veins reveal similar fluid chemistry, P-T and, surprisingly, a complete absence of carbonic inclusions. Fluid inclusion textures and the shape of T-h, histograms point towards moderate reequilibration during a phase of isothermal decompression. The microthermometric data, coupled with stability relations of the hydrous Ca-Al silicates, indicate post-mineralization isobaric cooling followed by a near-isothennal decompression. The observed temperature salinity variation is schematically explained by simple cooling of a low salinity heated meteoric fluid, followed by isothermal mixing with a high salinity granitic fluid. However, fluid mixing was later than, and unrelated to mineralization. On the other hand, fort-nation of auriferous sulfide-bearing quartz veins at Uti was essentially due to remobilization and attendant fluid-rock interaction involving suitable host rocks that contained primary gold. (c) 2005 Elsevier B.V All rights reserved.
引用
收藏
页码:1 / 16
页数:16
相关论文
共 50 条
  • [41] Nature and conditions of gold mineralization at the Tau deposit, Mupane mine, Tati Greenstone Belt, Botswana: Evidence from fluid inclusion and arsenopyrite geothermometer
    Seaba, Onameditse Lulu
    Imai, Akira
    Yonezu, Kotaro
    Nopeia, Manuel
    Baliki, Kemmonye
    RESOURCE GEOLOGY, 2023, 73 (01)
  • [42] Secondary geochemical dispersion in the Precambrian auriferous Hutti-Maski schist belt, Raichur district, Karnataka, India. Part II. Application of factorial design in the analysis of secondary dispersion of As
    Sahoo, NR
    Pandalai, HS
    Subramanyam, A
    JOURNAL OF GEOCHEMICAL EXPLORATION, 2000, 71 (03) : 291 - 303
  • [43] Fluid inclusion studies of gold-bearing quartz veins from the Yirisen deposit, Sula Mountains greenstone belt, Masumbiri, Sierra Leone
    Barrie, IJ
    Touret, JLR
    ORE GEOLOGY REVIEWS, 1999, 14 (3-4) : 203 - 225
  • [44] FLUID INCLUSION STUDIES OF AURIFEROUS QUARTZ VEINS FROM SONAKHAN GREENSTONE BELT, CENTRAL INDIA
    Deshmukh, S. D.
    Hari, K. R.
    Diwan, P.
    SGAT BULLETIN, 2015, 16 (02): : 33 - 38
  • [45] Tourmaline from the Archean GRHalli gold deposit, Chitradurga greenstone belt, Dharwar craton (India): Implications for the gold metallogeny
    Gupta, Susmita
    Jayananda, M.
    Fareeduddin
    GEOSCIENCE FRONTIERS, 2014, 5 (06) : 877 - 892
  • [46] Fluid evolution of the late Archaean Rämepuro gold deposit in the Ilomantsi greenstone belt in eastern Finland
    Matti Poutiainen
    Sami Partamies
    Mineralium Deposita, 2003, 38 : 196 - 207
  • [47] Fluid inclusion studies on barite from Hutti Gold Mines, Karnataka, India: inferences on late-stage hydrothermal fluid
    Nevin, C. G.
    Pandalai, H. S.
    CURRENT SCIENCE, 2010, 98 (07): : 955 - 962
  • [48] Mantle origin for auriferous CO2 rich fluids at the Archaean lode gold deposit of Ajjenahalli, Chitradurga greenstone belt, southern India
    Sarangi, S.
    Sarkar, A.
    Srinivasan , R.
    Patel, S. C.
    GEOCHIMICA ET COSMOCHIMICA ACTA, 2009, 73 (13) : A1158 - A1158
  • [49] Characteristics of fluid inclusions and mineralization of lode gold deposits in the greenstone belt of northern Madagascar
    Wu D.
    Sun W.
    Zhao Y.
    Xu F.
    Xu T.
    Wang K.
    Zhao, Yuandong (zhaoyd1981@qq.com), 1600, Geological Society of China (95): : 1231 - 1244
  • [50] The characteristics of ore-forming fluid and genetic type of the Chang' an gold deposit in southern Ailaoshan metallogenic belt
    Li ShiHui
    Zhang Jing
    Deng Jun
    Wang Huan
    Liu JiangTao
    Zhao Kai
    ACTA PETROLOGICA SINICA, 2011, 27 (12) : 3777 - 3786