VEINS SYSTEM AND THEIR MINERALOGICAL AND MICROTHERMOMETRIC CHARACTERISTICS WITHIN THE HUMPA LEU EAST PORPHYRY COPPER-GOLD MINERALIZATION AT HU'U DISTRICT, SUMBAWA ISLAND, INDONESIA
DOI:
https://doi.org/10.11113/jurnalteknologi.v84.17906Keywords:
Porphyry, ore fluids, mineralogy, Humpa Leu East, IndonesiaAbstract
The study area, i.e Humpa Leu East is a porphyry prospect located in Hu'u district, Sumbawa Island, Indonesia. This study is aimed to understand the characteristics of veins, the distribution of veins and mineralogy, microthermometric conditions of ore fluids, distribution of elements, and their implications for exploration and deposit model. The Hu'u district is a paleo-volcano member of the Miocene to Plio-pleistocene volcanic rocks. Hydrothermal alteration evolved to get out from the tonalitic body, consists of potassic, propyllitic and overprinted by phyllic and advanced argillic. The mineralization is dominated by chalcopyrite, associated with quartz±anhydrite veins, and hydrothermal breccia. Hydrothermal fluids temperature measured at the value of 109.9 °C - 525.3 °C and > 550 ° C with an averaging range of Th is 296.5 -329.7 °C, and salinity of 10.9 wt% NaCl eq. Quartz veins occur as a package or series of porphyry type veins designated as EDM-M1-A1, A2-A3-Apsb-anh, A3-A2, M2-Apsb-A2-A3, M1-B-C, C-D-anhydrite, and epithermal veins. Hydrothermal fluids possibly have mixed by high-temperature hyper-saline fluids to medium temperature low saline fluids. The Humpa Leu East can be identified as a 'push-up porphyry system' that still remains more extensive system underneath or in the side area. These results can be used for understanding the texture of veins as a vectoring to ore, metal distribution in veins and rocks. Early type veins such as type A have more intensive metal content and are followed by type B, C and weaken until the latest stage.
References
A. H. Mitchell and J. D. Bell. 1973. Island-Arc Evolution and Related Mineral Deposits. J. Geol. 81(4): 381-405. [Online]. Available: http://www.jstor.org/stable/30070630.
L. B. Gustafson and J. P. Hunt. 1975. The Porphyry Copper Deposit at El Salvador, Chile. Econ. Geol. 70(5): 857-912. Doi: 10.2113/gsecongeo.70.5.857.
G. Corbett. 2009. Anatomy of Porphyry-related Au-Cu-Ag-Mo Mineralized Systems : Some Exploration Implications. Aust. Inst. Geosci. North Queensl. Explor. Conf. June: 1-13.
R. H. Sillitoe. 2010. Porphyry Copper Systems. Econ. Geol. 105: 3-41.
D. A. John et al. 2010. Porphyry Copper Deposit Model Scientific Investigations Report 2010 – 5070 – B.
R. L. Harrison et al. 2018. Geochronology of the Tumpangpitu Porphyry Au-Cu-Mo and High-sulfidation Epithermal Au-Ag-Cu Deposit: Evidence for Pre-and Postmineralization Diatremes in the Tujuh Bukit District, Southeast Java, Indonesia. Econ. Geol. 113(1): 163-192. [Online]. Available: https://doi.org/10.5382/econgeo.2018.4547.
P. Shen et al. 2012. Geochronology and Isotope Geochemistry of the Baogutu Porphyry Copper Deposit in the West Junggar Region, Xinjiang, China. J. Asian Earth Sci. 49: 99-115. Doi: 10.1016/j.jseaes.2011.11.025.
G. D. MacDonald and L. C. Arnold. 1994. Geological and Geochemical Zoning of the Grasberg Igneous Complex, Irian Jaya, Indonesia. J. Geochemical Explor. 50(1-3): 143-178. Doi: 10.1016/0375-6742(94)90023-X.
A. Maryono, R. L. Harrison, D. R. Cooke, I. Rompo, and T. G. Hoschke. 2018. Tectonics and Geology of Porphyry Cu-Au Deposits along the Eastern Sunda Magmatic Arc, Indonesia. Econ. Geol. 113(1): 7-38. [Online]. Available: http://dx.doi.org/10.5382/econgeo.2018.4542.
PT. Sumbawa Timur Mining. 2019. Paparan Geologi, Panasbumi dan Geohidrologi - Project Hu’u, Sumbawa. Unpublished Company Internal Report. 48.
J. C. Carlile and A. H. G. Mitchell. 1994. Magmatic Arcs and Associated Gold and Copper Mineralization in Indonesia. J. Geochemical Explor. 50(1-3): 91-142.
T. Van Leeuwen. 2018. Twenty five More Years of Mineral Exploration and Discovery in Indonesia (1993 - 2017). Jakarta: 10 th Anniversary Special Publication-Masyarakat Geologi Ekonomi Indonesia.
J. A. Katili. 1971. A Review of the Geotectonic Theories and Tectonic Maps of Indonesia. Earth-Science Rev. 7(3): 143-163.
H. Sundhoro et al. 2005. Survei Panas Bumi Terpadu (Geologi, Geokimia dan Geofisika) Daerah Hu’u, Kabupaten Dompu, Provinsi Nusa Tenggara Barat. Proceedings Kolukium Hasil Lapangan – DIM 2005. 38–1– 38–10.
A. Sudradjat, A. Mangga, and N. Suwarna. 1998. Peta Geologi Regional Lembar Sumbawa, Nusa Tenggara Skala 1:250.000. Pusat Penelitian dan Pengembangan Geologi, Bandung.
D. R. Burrows, M. Rennison, D. Burt, and R. Davies. 2020. The Onto Cu-Au Discovery, Eastern Sumbawa, Indonesia: A Large, Middle Pleistocene Lithocap-Hosted High-Sulfidation Covellite-Pyrite Porphyry Deposit. Econ. Geol. 115(7): 1385-1412. Doi: 10.5382/econgeo.4766.
E. Galanopoulos et al. 2018. A New Porphyry Mo Mineralization at Aisymi-Leptokarya, South-Eastern Rhodope, North-East Greece: Geological and Mineralogical Constraints. Geosciences. 8(12): 435. Doi: 10.3390/geosciences8120435.
M. Azadi, M. Mirmohammadi, and R. Pezhman. 2014. Geometric-genetic and Mineralogical Classification of Veinlets and Breccias in Kahang Porphyry Copper Deposit. Northern East Isfahan. 21st Symp. Crystallogr. Mineral. Iran, Univ. Sistan Baluchestan.
G. J. Corbett and T. M. Leach. 1998. Southwest Pacific Rim Gold–copper Systems: Structure, Alteration and Mineralization. Soc. Econ. Geol. 236.
G. J. Masterman, D. R. Cooke, R. F. Berry, J. L. Walshe, A. W. Lee, and A. H. Clark. 2005. Fluid Chemistry, Structural Setting, and Emplacement History of the Rosario Cu-Mo Porphyry and Cu-Ag-Au Epithermal Veins, Collahuasi District, Northern Chile. Econ. Geol. 100(5): 835-862. Doi: 10.2113/gsecongeo.100.5.835.
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