Fertility and endowment indices for mineral systems: examples for Zn-Pb systems David Huston All mineral provinces are not created equally.

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Presentation transcript:

Fertility and endowment indices for mineral systems: examples for Zn-Pb systems David Huston All mineral provinces are not created equally

Fertility indicators Sillitoe (2012) Circum-Pacific porphyry copper provinces Fertility: Presence Endowment: Amount

Fertility indicators Possible controls on fertility and endowment Geodynamic environment Tectonic setting and events Evolution of atmosphere and hydrosphere Size of individual mineral systems Temporal distribution Paleoclimate Source volumes and concentrations Magmatic crystallisation history Preservation

Fertility indicators VHMS – rhyolite geochemistry and fertility Hart (2004); following Lesher et al. (1986)

Fertility indicators VHMS – Nd-Pb isotopes and endowment VHMS deposits Lode gold deposits Well endowed provinces: T 2DM within 200 myr of volcanic age  < 8.3

Fertility indicators Lead isotope patterns in the Abitibi-Wawa Subprovince Abitibi-Wawa has much lower μ than Eastern Goldfields

Fertility indicators Comparison of VHMS endowment, Archean terranes ProvinceCu + Zn + Pb endowment (t/km 2 ) North Pilbara20 Whundo120 Yilgarn Craton30 Teutonic zone45 Cue zone280 Superior Province45 Abitibi-Wawa Subprovince170 Uchi Subprovince10 Wabigoon Subprovince20 Slave Province35 Eastern Slave35 Western Slave35

Fertility indicators Leach et al. (2010) Link between metal endowment of paleolatitude of sediment- hosted Zn-Pb deposits Latitude from paleomagnetic data Probably related to formation of evaporites as salt source

Fertility indicators Hart (2004) Limitations to fertility and endowment indices Secular variations Unusual deposits (e.g., hybrid Cu- Au) can have unusual signatures Not “silver bullets”, but useful as indicators

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