Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/30017
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- Title
- Thermal history analysis of selected Chilean, Indonesian and Iranian porphyry Cu-Mo-Au deposits
- Related
- Porter, T. M.. Super porphyry copper and gold deposits : a global perspective : Vol. 1 1st ed., p.27-42
- Publisher
- Linden Park, SA : PGC Publishing
- Date
- 2005
- Author/Creator
- McInnes, Brent I. A
- Author/Creator
- Evans, Noreen J
- Author/Creator
- Deckart, Katja
- Author/Creator
- Fu, Frank Q
- Author/Creator
- Garwin, Steve
- Author/Creator
- Belousova, Elena
- Author/Creator
- Griffin, W. L
- Author/Creator
- Bertens, Alfredo
- Author/Creator
- Sukarna, Djadjang
- Author/Creator
- Permanadewi, Sam
- Author/Creator
- Andrew, Ross L
- Description
- 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.
- Description
- 16 page(s)
- Resource Type
- book chapter
- Organisation
- Macquarie University. National Key Centre for Geochemical Evolution and Metallogeny of Continents (GEMOC)
- Organisation
- Macquarie University. Dept. of Earth and Planetary Sciences
- Identifier
- http://hdl.handle.net/1959.14/30017
- Identifier
- ISBN:0958057427
- Identifier
- mq-rm-2005003212
- Language
- eng
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