O-H_Stable_Isotopes

5 2 629 10 o o 1122 k 848 c 5 o and h isotopes in

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Unformatted text preview: and δ18Omag = 0‰. 18 ΔO quartz magnetite 18 18 ≈ δ Oquartz − δ Omagnetite 6 6.29 × 10 5−0 = ! and 2 T 6 T= Wednesday, 15 August, 12 6 6.29 × 10 = ! 2 T 6 6.29 × 10 T= ! 5 2 6.29 × 10 o o = 1122 K = 848 C ! 5 O and H Isotopes in Fluid Tracing • Key is O and H can be used to understand the origin of fluids in ore systems. • Often measure OH-bearing minerals or fluids themselves. • Key variations in fluid compositions as a function of latitude and altitude and as a function of physiochemical conditions of ore formation. Wednesday, 15 August, 12 δD and δ18O of Natural Waters From Rollinson (1993) Wednesday, 15 August, 12 18 Ov = -13‰ 18 Oo = 0 ‰ Equator Wednesday, 15 August, 12 18 18 OL = - 3 ‰ 18 Ov = -15‰ 18 OL = - 5 ‰ Ov = -17‰ 18 OL = - 7 ‰ North America Wednesday, 15 August, 12 δD and δ18O of Natural Waters From Clark and Fritz (1997) Wednesday, 15 August, 12 Wednesday, 15 August, 12 Wednesday, 15 August, 12 Wednesday, 15 August, 12 δD vs. δ18O in MVT Deposits and Oil Field Brines Taylor 1997 in Geochemistry of Hydrothermal Ore Deposits Wednesday, 15 August, 12 δD and δ18O in Epithermal Deposits Taylor 1997 in Geochemistry of Hydrothermal Ore Deposits Wednesday, 15 August, 12 Fluid: Rock Ratios • The degree of isotopic exchange between a fluid and a rock can be used to estimate the relative volumes or masses of fluids. • In general, fluids typically have light δ18O and δD values, wher...
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This document was uploaded on 03/06/2014 for the course ES 4502 at Memorial University.

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