This paper presents U-Pb-He triple dating age determination for several porphyry Cu±Mo±Au deposits in Chile, Indonesia and Iran in an effort to determine their thermal histories and to explore the effects of cooling/exhumation rates on ore formation and preservation processes. Inverse thermal modelling of measured time-temperature history data from these deposits was conducted to quantitatively constrain the depth of emplacement, duration of ore deposition, exposure ages and cooling/exhumation rates. The duration of hypogene ore formation for the deposits studied generally occurs within timeframes of 10⁵ years, although modelling results for the Grasberg, Batu Hijau and El Teniente super porphyry deposits suggest formation periods of the order of 10⁴ years. Emplacement depths on intrusions associated with porphyry mineralisation range from 800 m to 5500 m from the palaeosurface, with the Grasberg and Rio Blanco being respectively the shallowest and deepest super porphyry deposits studied. The thermochronology data indicates a positive correlation between metal grade and cooling rate during hypogene ore formation, but further investigation is warranted. Exhumation rates varying from 0.3 to 1.1 km/m.y. have implications for the preservation potential of hypogene ore deposits, with super porphyry deposits like Sar Cheshmeh potentially losing 3.5 Mt of copper to erosion over the last 5 million years. The potential for supergene ore formation under such conditions is high, as is the potential for the formation of proximal Exotica-type deposits.
|Title of host publication||Super porphyry copper and gold deposits|
|Subtitle of host publication||a global perspective|
|Editors||T. M. Porter|
|Place of Publication||Linden Park, SA|
|Number of pages||16|
|Publication status||Published - 2005|
McInnes, B. I. A., Evans, N. J., Fu, F. Q., Garwin, S., Belousova, E., Griffin, W. L., ... Deckart, K. (2005). Thermal history analysis of selected Chilean, Indonesian and Iranian porphyry Cu-Mo-Au deposits. In T. M. Porter (Ed.), Super porphyry copper and gold deposits: a global perspective (1st ed., Vol. 1, pp. 27-42). Linden Park, SA: PGC Publishing.