Karakteristik Fluida Hidrotermal Endapan Emas Orogenik di Pegunungan Rumbia, Kabupaten Bombana, Provinsi Sulawesi Tenggara

Hasria Hasria, Arifudin Idrus, I Wayan Warmada

Abstract


Recently, gold exploration activities  are not only focused along volcanic-magmatic belt but also starting to shift along metamorphicand sedimentary terrains. The purpose of this study is to analyses the characteristics hydrothermal fluids gold deposits t in the Rumbia Mountains, Bombana Regency, Southeast Sulawesi. There are three generations of veins identified including the first is parallel to the foliations, the second crosscuts the first generation of veins/foliations, and the third is of laminated deformed quartz+calcite veins at the late stage. Temperature of homogenization (Th) and salinity at Rumbia Mountain of the first vein vary from 220 to 355.30oC and 6.74 to 10.11 wt. % NaCl eq., respectively. The second generation vein was originated at Th of 157 to 255.50oC and salinity of 3.39 to 6.88 wt.%NaCl eq., whereas the third generation vein formed at lowest Th varying from 104.40 to 265.90oC and less saline fluid at salinity range between 0.18 and 6.30 wt.% NaCl eq. The result of temperature formation value correlation to the depth of the formation of orogenic gold deposits in Rumbia Mountain is indicated to form on sub-greenschist to greenschist facies at depth of about 4-8 kilometers and formation temperature between 104.40 - 355.30oC at zone epizonal and mesozonal. Based on characteristics fluids inclusion discussed above, the primary metamorphic-hosted gold mineralization type at Rumbia Mountain tends to meet the criteria of orogenic gold type.  

Keyword : fluid iclusion, quartz veins, Rumbia mountain, orogenic gold deposits.

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References


Hall, R. (1995). Plate tectonic reconstructions of the Indonesian region. Indonesian Petroleum Association, Proceedings 24th Annual Convention, 24, 71-84.

Bodnar, R.J. and Vityk, M.O., 1994. Interpretation of Microthermometric Data for H2O-NaCl Fluid Inclusions. In. De Vivo, B. and Frezzotti, M.L. (Eds.). Fluid Inclusions in Mineral, Methods and Applications, Published by Virginia Tech, Blacksburg, VA, 117-130.

Bodnar, R.J., 1993. Revised Equation and Table for Determining the Freezing Point Depression of H2O-Nacl Solution. Geochimica Et Cosmochimica Acta, 57, 683-684.

Gebre-Mariam, M., Hagemann, S.G., and Groves, D.I., 1995. A Classification Scheme for Epigenetic Archaen Lode-Gold Deposits. Mineralium Deposits, 30, 408-410.

Goldfarb, R.J., and Groves, D.I., 2015. Orogenic Gold : Common or Evolving Fluid and Metal Sources Through Time. Lithos, 233, 2-26.

Groves, D.I., 1993, The crustal continuum model for late-Archaean lodegold deposits of the Yilgarn block, Western Australia: Mineralium Deposita, 28, 366–374.

Groves, D.I., Goldfarb, R.J., Gebre-Mariam, M., Hagemann, S.G., and Robert, F., 1998. Orogenic Gold Deposits: A Proposed Classification in the Context of Their Crustal Distribution and Relationship to Other Gold Deposit Types: Ore Geology Reviews, 13, 7-27.

Groves, D.I., Goldfarb, R.J., Robert, F., and Hart, C.J.R., 2003. Gold Deposits in Metamorphic Belts: Overviuw of Current Understanding, Outstanding Problems, Future Research, and Exploration Significance. Economic Geology, 98, 1-29.

Hasria., Idrus, A., Warmada, I.W. 2017. The Metamorphic Rocks-Hosted Gold Mineralization At Rumbia Mountains Prospect Area In The Southeastern Arm Of Sulawesi Island, Indonesia. Journal of Geoscience, Engineering, Environment, and Technology, 2, 213-227.

Shepherd,T.J., Rankin, A.H. and Alderton, D.H.M. 1985. A Practical Guide to Fluid Inclusion Studies: Blackie and Son Ltd., Glasgow, 239p.

Simandjuntak, T.O., Surono, dan Sukido. 1993. Peta Geologi Lembar Kolaka, Sulawesi, Skala 1:250.000. Pusat Penelitian dan Pengembangan Geologi, Bandung.

Surono. 2013a. Geologi Lengan Tenggara Sulawesi. Badan Geologi, Kementerian Energi dan Sumber Daya Mineral. Bandung, 169p.




DOI: http://dx.doi.org/10.33332/jgsm.geologi.v20i2.427

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