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The giant Bingham Canyon porphyry Cu-Mo-Au deposit (Utah) is associated with Eocene subvolcanic intrusions. It shows a distinct metal zonation above a barren core, with dominantly shallow Cu-Au mineralization (Cu stage) following the early quartz monzonite porphyry (QMP) intrusion, and spatially deeper Mo mineralization (Mo stage) …Web
Abstract The timing and temperature at which copper-iron and molybdenum sulfide deposition occurs in porphyry deposits remain controversial. Petrologic estimates indicate that veins and wall-rock alteration zones containing copper-iron sulfides form in …Web
the Porphyry Copper-Molybdenum Deposit at Butte, Montana BRIAN G. RUSK†,* MARK H. REED, Department of Geological Sciences, 1272 University of Oregon, Eugene, Oregon, 97403 ... The distribution of vein and alteration types and the distribution of fluid inclusions in these veins record the progressive pressure, temperature, and compositional ...Web
Identifying hydrothermal quartz vein generations in the Taiyangshan porphyry Cu-Mo deposit (West Qinling, China) using cathodoluminescence, trace element geochemistry, and fluid inclusions ... Geologic and geochemical insights into the formation of the Taiyangshan porphyry copper–molybdenum deposit, Western Qinling Orogenic …Web
The timing and temperature at which copper-iron and molybdenum sulfide deposition occurs in porphyry deposits remain controversial. Petrologic estimates indicate that veins and wall-rock alteration zones containing copper-iron sulfides form in a wide temperature range from ~350° to 650°C. Most sulfides are hosted in potassium(K) …Web
Abstract. Coarse muscovite veins and alteration occur in porphyry copper and porphyry molybdenum-copper systems within the Laramide arc in Arizona, as well as at the Yerington district in Nevada. This work describes coarse muscovite in veins and altered wall rock in porphyry systems in this region and documents mineral assemblages, mineral ...Web
An occurrence of molybdenum, copper, and iron mineralization in the Argentine Islands, West Antarctica Donald D. Hawkes; ... and conspicuous quartz magnetite veins. It is associated with a Tertiary granodioritic pluton (cut by small irregular bodies of quartz monzonite) which intrudes mainly Mesozoic volcanic rocks. ...Web
Fluid inclusions in postore calcite veins are of only type 2 fluid inclusions, which homogenize at 209°C. Hydrothermal fluids recorded by type 1 and type 3 fluid inclusions in early veins were trapped under lithostatic to hydrostatic conditions between 0.3 and less than or equal to 2.0 kbar, and 360° and 560°C.Web
Abstract. Copper, gold, and molybdenum in the Bingham Canyon deposit (Utah, United States) show a systematic distribution in grade and metal ratios. Most Cu …Web
Copper was introduced later in EDM halos at ~500ºC and was followed by molybdenite in BMQ veins at ~650ºC during a thermal reversal. A second stage of copper and …Web
This is consistent with the occurrence of sulfide melt inclusions in quartz veins in some porphyry copper deposits (Candela, 1997, Keith et al., ... The Machangqing copper–molybdenum deposits, Yunnan, China – an example of Himalayan porphyry-hosted Cu–Mo mineralisation. Mineralogy and Petrology, 63 (1998), pp. 95-117.Web
We present Mo isotopic ratios of molybdenite from five porphyry molybdenum deposits (Chagele, Sharang, Jiru, Qulong, and Zhuonuo) and one quartz-molybdenite vein-type deposit (Jigongcun) along the Gangdese metallogenic belt in the Tibetan Plateau. These deposits represent a sequence of consecutive events of the India-Asia collision at …Web
Porphyry copper deposits (and their close relatives, porphyry molybdenum deposits) contain disseminated mineralization, meaning that a large volume of shattered rock contains a ramifying network of tiny quartz veins, spaced only a few centimetres apart, in which grains of the copper ore minerals chalcopyrite and bornite (or the molybdenum ore ...Web
Coarse muscovite veins and alteration occur in porphyry copper and porphyry molybdenum-copper systems within the Laramide arc in Arizona, as well as at the Yerington district in Nevada. This work describes coarse muscovite in veins and altered wall rock in porphyry systems in this region and documents mineral assemblages, …Web
Coarse muscovite veins and alteration occur in porphyry copper and porphyry molybdenum-copper systems within the Laramide arc in Arizona, as well as at the …Web
Molybdenum-bearing porphyry copper, copper-molybdenum, molybdenum-copper and molybdenum deposits are typically formed in island arcs, continental arcs, and volcanicplutonic belts of continental ...Web
porphyry copper-molybdenum family, also known as quartz monzonite type, granodiorite type, and calc-alkaline type. They have similar F/Cl ratios to porphyry copper deposits, ... Fissure-vein deposits consist of molybdenite-bearing quartz veins, in or adjacent to felsic intrusives. Pyrite is commonlyWeb
Porphyry deposits are the world's dominant sources of copper and molybdenum as well as important reservoirs of other base and precious metals . ... M. Scanning electron microscope—Cathodoluminescence analysis of quartz reveals complex growth histories in veins from the Butte porphyry copper deposit, Montana. Geology …Web
The distribution of molybdenum resembles that of copper and partly overlaps with it, but the molybdenum ore shell is generally displaced inward and downward from the copper ore shell. Systematic measurement of the abundance and orientation of three major vein types obtained at the pit surface were complemented with unoriented vein density …Web
The origin of hypogene alteration and mineralization features in the Escondida porphyry Cu deposit resulted from intense over related to three main hydrothermal stages. The beginning of each stage is recorded by deposition of bright quartz crystals on vein walls that precipitated from high-temperature fluids. In the deepest zones of the …Web
Minerals: Porphyry deposits are typically mineralized with copper, gold, molybdenum, and silver. The minerals are typically found as sulfides and other minerals in the form of veins and disseminations. Geology: Porphyry deposits are associated with intrusive igneous rocks, such as granites and diorites. The mineralization is typically …Web
Figure 9.75: Gold-bearing quartz vein at the Nalunaq Gold Mine in Southern Greenland. Meter stick for scale. ... Disseminated deposits produce most of the world's diamonds, copper, and molybdenum and also large percentages of the available tin, silver, and mercury. Often, disseminated ores consist of minerals scattered randomly in a host …Web
Measurable molybdenum isotope fractionation in molybdenites from different ore deposits through time provides insights into ore genesis and a new technique to identify open-system behavior of Re–Os in molybdenites. Molybdenite samples from six porphyry copper deposits, one epithermal polymetallic vein deposit, four skarns, and …Web
Most of the world's copper and molybdenum come from porphyry-type ore deposits in Earth's crust. The metals are deposited either as veins of concentrated …Web
40 Ar/ 39 Ar and Re-Os geochronology of porphyry copper-molybdenum deposits and related copper-silver veins in the Collahuasi district, Northern Chile. / Masterman, Glenton J.; Cooke, David R.; Berry, Ron F. et al. In: Economic Geology, Vol. 99, No. 4, 06.2004, p. 673-690. Research output: Contribution to journal › Article › peer-reviewWeb
Geology, geochronology, and geochemistry of the Gaojiabang tungsten-molybdenum deposit, Anhui Province, Southeast China. Author links open overlay panel ... Three distinct styles of W-Mo mineralization are recognized: minor vein-type W-Mo mineralization within sedimentary units; skarn W-Mo mineralization at the contact …Web
Whereas molybdenite-bearing and barren (deep) quartz veins form at relatively high temperatures of ~550° to 650°C, copper-molybdenum–bearing B veins likely form at lower temperatures near ~500°C.Web
veins and veinlets ("A veinlets") through transitional, planar veins ("B veins") to late, through-going veins ("D ... large amount of the world's copper, molybdenum and gold. These deposits are formed from calc-alkaline and potassic magmas characterized by varying oxidation states (fO 2 ...Web
Coarse muscovite veins and alteration occur in porphyry copper and porphyry molybdenum-copper systems within the Laramide arc in Arizona, as well as at the Yerington district in Nevada.Web
Whereas molybdenite-bearing and barren (deep) quartz veins form at relatively high temperatures of ~550° to 650°C, copper-molybdenum–bearing B veins likely form at lower temperatures near ~500°C.Web
The following main types of hydrothermal ores are distinguished according to the predominant minerals: (1) sulfide ores, which form deposits of copper, zinc, lead, molybdenum, bismuth, nickel, cobalt, antimony, and …Web
