Where Are Porphyry Copper Deposits Spatially Localized? A Case Study in Benguet Province, Philippines
Tóm tắt
To provide guides for exploration of porphyry copper mineralization at a district scale, we examine the spatial association between known porphyry copper deposits and geologic features in Benguet, Philippines. The spatial associations between the porphyry copper deposits and strike-slip fault discontinuities, batholithic pluton margins and porphyry plutons are quantified using weights of evidence modeling. In the training and testing district, the porphyry copper occurrences are associated spatially with strike-slip fault discontinuities, batholithic pluton margins and contacts of porphyry plutons within distances of 3 km, 2.25 km, and 1 km, respectively. In addition, the porphyry plutons are associated spatially with strike-slip fault discontinuities and contacts of batholithic plutons within a distance of 2.25 km and 3 km, respectively. Based on these significant spatial associations, predictive maps are generated to delineate zones favorable for porphyry copper mineralization and zones favorable for emplacement of porphyry plutons in Benguet province, Philippines. Validations of the predictive models demonstrate their efficacy in pointing to zones for subsequent follow-up exploration work.
Tài liệu tham khảo
Balce, G. R., Encina, R. Y., Momongan, A., and Lara, E., 1980, Geology of the Baguio district and its implications on the tectonic development of the Luzon Central Cordillera: Geology and Paleontology of South East Asia, v. 21, no. 3, p. 265-287.
Bishop, M. M., Feinberg, S. E., and Holland, P. W., 1975, Discrete multivariate analysis: theory and practice: MIT Press, Cambridge, Massachusetts, 587 p.
Bonham-Carter, G. F., 1994, Geographic Information Systems for geoscientists, modelling with GIS: Pergamon, New York, 398 p.
Bonham-Carter, G. F., Agterberg, F. P., and Wright, D. F., 1989, Weights of evidence modelling: a new approach to mapping mineral potential, in Agterberg, F. P., and Bonham-Carter, G. F., eds., Statistical Applications in the Earth Sciences: Geol. Survey Canada Paper 89-9, p. 171-183.
Bureau of Mines and Geosciences (BMG), 1986, Geology and mineral resources of the Philippines, Volume 2-Mineral Resources: BMG (Manila), 446 p.
Gold, T., and Soter, S., 1985, Fluid ascent through solid lithosphere and its relation to earthquakes: Pure and Applied Geophysics, v. 122, nos. 2-4, p. 492-530.
Karig, S. E., 1983, Accreted terranes in the northern part of the Philippine archipelago: Tectonics, v. 2, no. 2, p. 211-236.
Mandl, G., 1988, Mechanics of tectonic faulting: Elsevier, Amsterdam, 407 p.
MMAJ-JICA, 1977, Report on the Geological Survey of Northeastern Luzon, Phase III: Metal Mining Agency of Japan and Japan International Cooperating Agency (Tokyo), 280 p.
Ringenbach, J. C., Stephan, J. F., Maleterre, P., and Bellon, H., 1990, Structure and geologic history of the Lepanto-Cervantes releasing bend on the Abra River Fault, Luzon Central Cordillera, Philippines: Tectonophysics, v. 183, no. 3, p. 225-241.
Ryan, M. P., 1990, The physical nature of the Icelandic magma transport system, in Ryan, M. P., ed., Magma Transport and Storage: John Wiley &; Sons, Chichester, p. 175-224.
Segall, P., and Pollard, D. D., 1980, Mechanics of discontinuous faults: Jour. Geophys. Research, v. 85, no. B8, p. 4337-4350.
Sibson, R. H., 1987, Earthquake rupturing as a mineralizing agent in hydrothermal systems: Geology, v. 15, no. 8, p. 701-704.
Sibson, R. H., 1990, Conditions for fault-valve behavior, in Knipe, R. J., Knipe and Rutter, E. H., eds., Deformation Mechanisms, Rheology and Tectonics: Geol. Soc. London Publ. No. 54, p. 15-28.
Sillitoe, R. H., and Gappe, I. M., Jr., 1984, Philippines porphyry copper deposits: geologic setting and characteristics: CCOP Tech. Publ. 14, United Nations Economic &; Social Commission for Asia and Pacific (ESCAP), Committee for Co-ordination of Joint Prospecting for Mineral Resources in Asian Offshore Areas (CCOP) (Bangkok), 89 p.
Titley, S. R., and Beane, R. E., 1981, Porphyry copper deposits-Part I: Geological settings, petrology and tectogenesis: Economic Geology 75th Anniv.Vol. (SpecialVolume), p. 214-235.
Turner, D. D., 1997, Predictive GIS model for sediment-hosted gold deposits, North-Central Nevada, U.S.A, in Gubins, A. G., ed., Proc. Exploration 97: Fourth Decennial Intern. Conf. on Mineral Exploration (Toronto, Canada), p. 115-126.
White, F. M., 1974, Viscous fluid flow: McGraw-Hill Book Co., New York, 725 p.
Wolfe, J. A., 1988, Arc magmatism and mineralization in North Luzon and its relationship to subduction at the East Luzon and North Manila Trenches: Jour. Southeast Asian Earth Sciences, v. 2, no. 2, p. 79-93.