Porphyry Cu-(Mo-Au) deposits are relatively rare but reproducible products of subduction-related magmatism. No unique processes appear to be required for their formation, although additive combinations common tectono-magmatic processes, or optimization these can affect the grade and size as well location resulting deposits. These various contributing reviewed, from partial melting in mantle wedge overlying subducting plate, through magma interaction with lithosphere, mechanisms emplacement...

Based on a compilation of published sources, rocks referred to as adakites show the following geochemical and isotopic characteristics: SiO2 ≥56 wt percent, Al2O3 ≥15 MgO normally <3 Mg number ≈0.5, Sr ≥400 ppm, Y ≤18 Yb ≤1.9 Ni ≥20 Cr ≥30 Sr/Y ≥20, La/Yb 87Sr/86Sr ≤0.7045. Rocks with such compositions have been interpreted be products hybridization felsic partial melts from subducting oceanic crust peridotitic mantle wedge during ascent are not primary magmas. High andesites related by...

Research Article| March 01, 2009 Postsubduction porphyry Cu-Au and epithermal Au deposits: Products of remelting subduction-modified lithosphere Jeremy P. Richards * 1Department Earth Atmospheric Sciences, University Alberta, Edmonton, Alberta T6G 2E3, Canada *E-mail: Jeremy.Richards@ualberta.ca. Search for other works by this author on: GSW Google Scholar Author Article Information Publisher: Geological Society America Received: 18 Aug 2008 Revision 28 Oct Accepted: 30 First Online: 02 Mar...

The temporal and geochemical evolution of arc magmatism that culminated in porphyry Cu ± Mo Au deposit formation has been studied three separate Neo-Tethyan systems central eastern Iran, western Pakistan. Porphyry Cu-Au deposits the Lut block Iran formed middle Eocene at end a period extensive Paleocene-Eocene volcanism; Cu-Mo Kerman belt Miocene voluminous Eocene-Oligocene Chagai Pakistan four pulses during Eocene, early Miocene, middle-late late Miocene-Pliocene, after prolonged began Late...

This paper reviews the tectonic, magmatic, and metallogenic history of Tethyan orogen from Carpathians to Indochina. Focus is placed on formation porphyry Cu ± Mo Au deposits, as being most characteristic mineral deposit type formed during both subduction collisional processes in this region. Relatively little known about Paleotethys ocean, which opened closed between Gondwana Eurasia Paleozoic, few ore deposits are preserved period. The Neotethyan ocean Permian–Early Triassic Cimmerian...

Research Article| November 01, 2014 Increasing Magmatic Oxidation State from Paleocene to Miocene in the Eastern Gangdese Belt, Tibet: Implication for Collision-Related Porphyry Cu-Mo ± Au Mineralization* Rui Wang; Wang † 1Department of Earth and Atmospheric Sciences, University Alberta, Edmonton, Alberta T6G 2E3, Canada †Corresponding author: e-mail, rw5@ualberta.ca Search other works by this author on: GSW Google Scholar Jeremy P. Richards; Richards Zeng-qian Hou; Hou 2Institute Geology,...

Research Article| August 01, 2014 Increased Magmatic Water Content—The Key to Oligo-Miocene Porphyry Cu-Mo ± Au Formation in the Eastern Gangdese Belt, Tibet Rui Wang; Wang † 1 Department of Earth and Atmospheric Sciences, University Alberta, Edmonton, Alberta T6G 2E3, Canada †Corresponding author: e-mail, rw5@ualberta.ca Search for other works by this author on: GSW Google Scholar Jeremy P. Richards; Richards Zengqian Hou; Hou 2 Institute Geology, Chinese Academy Geological Beijing 100037,...

A program of geologic mapping and lithogeochemical geochronological sampling has been carried out over a 745-km2 area the Atacama Desert surrounding porphyry Cu deposits at Escondida, Zaldivar, Chimborazo (Cordillera de Domeyko, northern Chile). The purpose this study was to examine regional tectonic magmatic setting preeminent district for evidence features or processes that might explain giant scale mineralization Escondida provide predictive tools exploration in other areas. The history...

Research Article| July 01, 2013 Magmatic-hydrothermal processes within an evolving Earth: Iron oxide-copper-gold and porphyry Cu ± Mo Au deposits Jeremy P. Richards; Richards * 1Department of Earth Atmospheric Sciences, University Alberta, Edmonton, Alberta T6G 2E3, Canada *E-mails: Jeremy.Richards@ualberta.ca; Mumin@BrandonU.ca. Search for other works by this author on: GSW Google Scholar A. Hamid Mumin 2Department Geology, Brandon University, 270 18th Street, Brandon, Manitoba R7A 6A9,...

Porphyry Cu ± Mo Au and iron oxide copper-gold (IOCG) deposits share many similarities (e.g., Fe, Cu, contents), but also have important differences the predominance of sulfide minerals in porphyry oxides IOCG deposits). Genetic comparisons are complicated by broad definition deposits; here we restrict our study to that related igneous intrusive systems. In Mesozoic Coastal Cordillera northern Chile, both occur close spatial temporal proximity, offering chance examine what controls their...

Research Article| August 01, 2018 Elevated Magmatic Sulfur and Chlorine Contents in Ore-Forming Magmas at the Red Chris Porphyry Cu-Au Deposit, Northern British Columbia, Canada Jing-Jing Zhu; Zhu 1 State Key Laboratory of Ore Deposit Geochemistry, Institute Chinese Academy Sciences, Guiyang 550081, PR China2 Harquail School Earth Laurentian University, 935 Ramsey Lake Road, Sudbury, Ontario, P3E 2C63 Department Atmospheric University Alberta, Edmonton, T6G 2E3 †Corresponding author: e-mail,...

Abstract Arc magmas globally are H2O-Cl-S–rich and moderately oxidized (ΔFMQ = +1 to +2) relative most other mantle-derived ≤ 0). Their relatively high oxidation state limits the extent which sulfide phases separate from magma, would otherwise tend deplete melt in chalcophile elements such as Cu (highly siderophile Au especially platinum-group depleted by even small amounts of segregation). As these rise into crust begin crystallize, they will reach volatile saturation, a hydrous, saline,...