Abstract
Absence or presence of modal magnetite and whole-rock Fe2O3/FeO ratio of granitoids have been potentially used to recognize the bimodal series of granioids in Japan viz. magnetite-series and ilmenite-series granitoids corresponding to oxidized and reduced granitoids respectively. Oxidized granitoids are mostly responsible for the origin of metallic (copper and gold) sulfide deposits particularly of porphyry nature. Oxidation status of some copper-hosting Precambrian and Phanerozoic granitoids have been assessed in order to understand intrinsic properties of source regions and prevailed oxygenated environment evolving through time. Chemistry of hydrous mafic silicates (amphibole and biotite) and apatite has also been discussed specifically to characterize the mineralized, oxidized granitoids and explaining the key role of F, Cl and SO3 as potential carrier of ore metals in hydrothermal system emanated from granitic magmas respectively.
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References
Camus F. (2003) Geologia de los sistemas porfiricos en los Andes de Chile. SERNAGEOMIN, Santiago, 267 p
Casselman MJ, McMillan WJ, Newman KM (1995) Highland Valley porphyry copper deposits near Kamloops, British Columbia: a review and update with emphasis on the valley deposit. In: Porphyry deposits of the Northwestern Cordillera of North America, CIM Special Volume (vol 46). The Canadian Institute of Mining, Metallurgy and Petroleum, pp 161–191
Czamanske GK, Ishihara S, Atkin SA (1981) Chemistry of rock-forming minerals of the Cretaceous-Paleogene batholiths in southwestern Japan and implications for magma genesis. J Geophy Res 86:10431–10469
Imai A (2002) Metallogenesis of porphyry Cu deposits of the Western Luzon Arc, Phillipines: K-Ar ages, SO3 contents of microphenocrystic apatite and significance of intrusive rocks. Resour Geol 52:147–161
Imai A (2004) Variation of Cl and SO3 contents of microphenocrystic apatite in intermediate to silicic igneous rocks of cenozoic Japanese Island arcs: implications for porphyry Cu metallogenesis in the Western Pacific arcs. Resour Geol 54:357–372
Ishihara S (1971a) Modal and chemical composition of the granitic rocks related to the major molybdenum and tungsten deposits in the inner zone of Southwest Japan. J Geol Soc Jpn 77:441–452
Ishihara S (1971b) Some chemical characteristics of the intrusive rocks of the bethlehem porphyry copper deposits, B.C Canada. Bull Geol Surv Jpn 22:535–546
Ishihara S (1977) The magnetite-series and ilmenite-series granitic rocks. Mining Geol 27:293–305
Ishihara S (1981) The granitoid series and mineralization. Econ Geol, 75th Anniversary volume, 458–484
Ishihara S, Chappell BW (2010) Petrochemistry of I-type magnetite-series granitoids of the northern Chile, highland valley, Southern B. C., Canada, Erdenet mine, Mongolia, Dexing mine, China, Medet mine, Bulgaria, and Ani mine. Jpn Bull Geol Surv Jpn 61:383–415
Ishihara S, Ulriksen CE, Sato K, Terashima S, Sato T, Endo Y (1984) Plutonic rocks of North–Central Chile. Geol Surv Jpn 35:503–536
Ishihara S, Yamamoto M, Sasaki A (1999) Sulfur and carbon contents and δ34S ratio of Miocne ilmenite-series granitoids: Osumi and Shibisan plutons SW Japan. Bull Geol Surv Jpn 50:671–682
Ishihara S, Ohmoto H, Anhaeusser CR, Imai A, Robb LJ (2006) Discovery of the oldest oxic granitoids in the Kaapvaal Craton and its implications for the redox evolution of early Earth. In: Kesler SE, Ohmoto H (eds) Evolution of early Earth’s atmosphere, hydrosphere, and biosphere—constraints from ore deposits, vol 198. Geological Society of America Memoir, pp 67–80
Kumar S, Rino V (2007) Redox series evaluation of Cu (±Mo ±Au) hosting Palaeoproterozoic Malanjkhand granitoids and enclaves, central India: evidence from magnetic susceptibility, phase petrology and geochemistry. J Econ Geol Geores Manage 4:105–127
Mariko T (2008) Geology of Ore Deposits. Kokin-Shoin, Tokyo, 580 p (in Japanese)
Sarkar SC, Kabiraj S, Bhattacharya S, Pal AB (1996) Nature, origin and evolution of the granitoids-hosted early Proterozoic copper-molybdenum mineralization at Malanjkhand, central India. Miner Deposita 31:419–431
Smithies RH, Champion DC (1999) Late Archean felsic alkaline igneous rocks in the Eastern Goldfields, Yilgarn Craton, Western Australia: a result of lower crustal delamination? J Geol Soc London 156:561–576
Smithies RH, Witt WK (1997) Distinct basement terranes iodentified from granite geochemistry in late Archean granite-greenstones, Yilgarun Craton, Western Australia. Precam Res 83:185–201
Stein HJ, Hannah JL, Zimmerman A, Markey RJ, Sarkar SC, Pal AB (2004) A 2.5 porphyry Cu-Mo-Au deposit at Malanjkhand, central India: implication for Late Archean continental assembly. Precam Res 134:189–226
Stein HJ, Hannah JL, Zimmerman A, Markey RJ (2006) Mineralization and deformation of the Malanjkhand terrain (2490–2440 Ma) along the Southern margin of Central Indian Tectonic Zone. Miner Deposita 40:755–765
Witt WK, Davy R (1997) Geology and geochemistry of Archean granites in the Kalgoorie region o the Eastern Goldfields, Western Australia: a syn-collisional tectonic setting? Precam Res 83:133–183
Acknowledgments
The authors wish to acknowledge Joseph B. Whalen and W. J. Davis for providing unpublished data. Santosh Kumar is thanked for generous comments on the earlier version and meticulous editorial work.
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Ishihara, S., Imai, A. (2014). Oxidized Granitic Magmas and Porphyry Copper Mineralization. In: Kumar, S., Singh, R. (eds) Modelling of Magmatic and Allied Processes. Society of Earth Scientists Series. Springer, Cham. https://doi.org/10.1007/978-3-319-06471-0_10
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