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- W14449044 abstract "As an introduction to this portion of the Symposium on Copper Deposits, this paper reviews recent progress and findings in research on deposits associated with hypabyssal epizonal plutons. The I-type affinity porphyry copper-molybdenum series is first established as petrogenically distinct from deposits associated with S-type, generally 2-mica granites, the porphyry tin — tin granite — uranium granite suite. Then five specific areas of advance in the 1970s and 1980s are described. The first deals with plate tectonic settings and the global geologic-lithologic distribution of porphyry base metal deposits (PBMDs). Second, the significance of the recognition of changes in the ratio of magmatic to meteoric fluids during alteration-mineralization and deposit emplacement is discussed, along with the concept of “phyllic overprint” and its applications. Techniques for observing, measuring, and describing the propagation of fluids and fracturing in time and space are given. Third, experimental studies, thermodynamic modeling, stable and radiogenic isotope analyses, and fluid inclusion chemical analysis and microthermometric studies and results that have advanced our understanding of the geochemical and thermal nature of PBMD fluids are cited. Fourth, geomathematical modeling studies that describe probable fluid source areas, flow paths, kinetics, and the volume hydrothermally influenced by the emplacement of PBMD systems are considered, and finally the present status of our understanding of PBMD fluids in terms of T, P, f(02), f(S2), salinity, and ion complexing are briefly stated. It is pointed out that the promise of the next decade is enormous if field and laboratory studies continue to loop back to support and extend the whole, and if research continues at its present pace." @default.
- W14449044 created "2016-06-24" @default.
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- W14449044 date "1986-01-01" @default.
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- W14449044 title "Recent Advances in Porphyry Base Metal Deposit Research" @default.
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- W14449044 doi "https://doi.org/10.1007/978-3-642-70902-9_13" @default.
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