Halter, W. E. (2002) The Origin of Cu/Au Ratios in Porphyry-Type Ore Deposits. Science, 296 (5574). 1844-1846 doi:10.1126/science.1070139
Reference Type | Journal (article/letter/editorial) | ||
---|---|---|---|
Title | The Origin of Cu/Au Ratios in Porphyry-Type Ore Deposits | ||
Journal | Science | ||
Authors | Halter, W. E. | Author | |
Year | 2002 (June 7) | Volume | 296 |
Page(s) | 1844-1846 | Issue | 5574 |
Publisher | American Association for the Advancement of Science (AAAS) | ||
DOI | doi:10.1126/science.1070139Search in ResearchGate | ||
Mindat Ref. ID | 2535106 | Long-form Identifier | mindat:1:5:2535106:2 |
GUID | 837fb7cf-ae3f-47dc-be00-9f9073451475 | ||
Full Reference | Halter, W. E. (2002) The Origin of Cu/Au Ratios in Porphyry-Type Ore Deposits. Science, 296 (5574). 1844-1846 doi:10.1126/science.1070139 | ||
Plain Text | Halter, W. E. (2002) The Origin of Cu/Au Ratios in Porphyry-Type Ore Deposits. Science, 296 (5574). 1844-1846 doi:10.1126/science.1070139 | ||
In | (2002, June) Science Vol. 296 (5574) American Association for the Advancement of Science (AAAS) |
References Listed
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Commonly used techniques such as electron or ion microprobe require thermal homogenization of crystallized MIs and subsequent exposure to the sample surface before analysis. | |
Llambias E. J., Rev. Asoc. Geol. Argent. 27, 161 (1972). | |
Sasso A. M., Clark A. H., Soc. Econ. Geol. Newsl. 34, 8 (1998). | |
W. E. Halter C. A. Heinrich and T. Pettke (in preparation) show that volcanic rocks are samples of magma extracted from the central part of a large magma chamber where new melt is periodically injected. Intrusive stocks are rooted in a chemically structured boundary layer developed at the contact of the hot magma with the colder host rock. Successive intrusions sample progressively deeper more basic parts of the boundary layer. Each intrusion is accompanied by a pressure drop inducing volatile exsolution from the magma portion intruded as the following batch. Thus each magma pulse is hydrothermally altered and mineralized by fluid from deeper parts of the reservoir; that is from magmas intruded at a later stage. Accordingly the last melt to intrude has lost its volatiles to previously emplaced intrusions but its phenocrysts still record sulfide MIs from the fluid source region. | |
. The prototype Excimer LA-ICPMS has been commercialized as GeoLas by Microlas (Göttingen Germany). | |
Jugo, P.J., Candela, P.A., Piccoli, P.M. (1999) Magmatic sulfides and Au:Cu ratios in porphyry deposits: an experimental study of copper and gold partitioning at 850°C, 100 MPa in a haplogranitic melt–pyrrhotite–intermediate solid solution–gold metal assemblage, at gas saturation. Lithos, 46 (3) 573-589 doi:10.1016/s0024-4937(98)00083-8 | |
D. J. Vaughan and J. R. Craig [in Geochemistry of Hydrothermal Ore Deposits H. L. Barnes Ed. (Wiley New York 1997) pp. 367–434] and C. Ballhaus M. Tredoux and A. Spath [ J. Petrol. 42 1911 (2001)] also demonstrated the presence of two sulfide liquids at these conditions albeit in Ni-bearing systems. | |
Larocque, A. C.L., Stimac, J. A., Keith, J. D., Huminicki, M. A.E. (2000) EVIDENCE FOR OPEN-SYSTEM BEHAVIOR IN IMMISCIBLE Fe S O LIQUIDS IN SILICATE MAGMAS: IMPLICATIONS FOR CONTRIBUTIONS OF METALS AND SULFUR TO ORE-FORMING FLUIDS. The Canadian Mineralogist, 38 (5) 1233-1249 doi:10.2113/gscanmin.38.5.1233 | |
J. D. Keith et al. J. Petrol. 38 16790 (1997). | |
U. Menet has been essential throughout the technical development and continuing upgrade of our LA-ICPMS facility. We appreciate helpful discussion with T. Grove S. Kesler and A. Thompson and constructive comments by two anonymous reviewers. |
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