Transitions from porphyry to epithermal environments

Epithermal environments transitions

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The Cheshmeh Hafez epithermal base metal deposit is located in Troud-Chah Shirin mountain range in the Alborz magmatic belt of northern Iran. New geochronological results indicate that the main stage of Golpu porphyry mineralization to the last stage of Wafi epithermal veins lasted between 1 k. Porphyry to epithermal transition Ralph J. Porphyry-Epithermal Transition: Maricunga Belt, Northern Chile JOHN L. title=Sulfidation State of Fluids in Active and Extinct Hydrothermal transitions from porphyry to epithermal environments Systems: Transitions from Porphyry to Epithermal Environments, author=Marco T. Notwithstanding the ubiquity of porphyry Cu belts, major deposits may also occur in isola-.

The transition between porphyry and epithermal. "Sulfidation State of Fluids in Active and Extinct Hydrothermal Systems: Transitions from Porphyry to Epithermal Environments", Volcanic, Geothermal, and Ore-Forming Fluids: Rulers and Witnesses of Processes within the Earth, Stuart F. The transition between porphyry and epithermal environments is exposed at Perol and Huaylamachay, La Zanja, and especially Tantahuatay and Yanacocha. Sulfidation state of fluids in active and extinct hydrothermal systems: Transitions from porphyry to epithermal environments MT Einaudi, JW Hedenquist, EE Inan Special Publication-Society of Economic Geologists 10,,. Porphyry to epithermal transition Ralph J. Within the high-sulfidation epithermal environment, the development of ore depends on.

IS epithermal deposits would be analogous to the transition commonly seen in porphyry copper districts from proximal copper-dominated ores to distal lead-zinc-silver ores (Table 4). Hedenquist Published Use of the. Structurally controlled, high-grade Au is apparently late and associated locally with intermediate-sulfidation assemblages, barite, and chalcedony. Sulfidation State of Fluids in Active and Extinct Hydrothermal Systems: Transitions from Porphyry to Epithermal Environments Marco T. Einaudi and Jeffrey W.

In: “Andean metallogeny: new discoveries, concepts, and updates”. ,, respectively), there is a need to better constrain the trace-element composition of pyrite throughout the transitions from porphyry to epithermal environments porphyry to epithermal transition. constitute porphyry Cu or epithermal Au provinces, several of which give rise to global-scale anomalies for Cu (e.

74 g/t Au: Cooke et al. Initially, there will be decreased alkalic magmatism, horizontal shortening, hydration of the lithosphere above the flat-slab, and low heat flow. Hedenquist 1 Transitions from porphyry to epithermalore environments Jeffrey W.

Advisor to the mineral exploration industry and government agencies, with focus on the epithermal precious metal environment and transition to the tops of porphyry copper deposits. The main porphyry-epithermal province in Australia is the Siluro-Ordovician Macquarie Arc in New South Wales, transitions from porphyry to epithermal environments which contains major porphyry Cu-Au deposits at Cadia (global resource of 1. Most of the epithermal Au occurs near the transition from the high- to intermediate-sulfidation domains. Further, conceptual models for the formation of acid-sulfate epithermal gold deposits stress the importance of both early magmatic vapor plumes and of late condensed magmatic-hydrothermal fluids, but the. "Porphyry-epithermal transition, Cajamarca region, Perú". The appearance of both galena and sphalerite (and tennantite to an extent) mark the transition from a porphyry to an epithermal environment.

5 2 km vertical interval. , north-ern Chile-southern Peru, southwestern North America) or Au (northern Peru; Sillitoe, ). 46 g/t Au: Cooke et al. BibTeX transitions from porphyry to epithermal environments author = Marco T. Thus, there is a transition between porphyry and epithermal gold deposits, particularly in low sulphidation systems. Porphyry and epithermal deposits Porphyry copper-molybdenum and copper-gold deposits are centred on shallow-level porphyry intrusions Grasberg, Indonesia Epithermal gold and transitions from porphyry to epithermal environments silver deposits are typically hosted by volcanic rocks Round Mountain, Nevada 3 transitions from porphyry to epithermal environments Porphyry and epithermal systems the state of play at end of 1960s (1). The porphyry to epithermal transition in a magmatic-hydrothermal transitions from porphyry to epithermal environments system:.

A subduction zone that transitions from normal to flat and then back to normal subduction transitions from porphyry to epithermal environments produces a series of effects that can lead to the generation of porphyry deposits. This is accompanied by an increased concentration of chalcophile trace elements in sulfides as determined by EMPA and LA-ICP-MS. the parental hydrothermal solutions 2,27,28. The Refugio, Aldebarán, and La Pepa districts in the Maricunga belt of northern Chile contain advanced argillic alteration zones transitions from porphyry to epithermal environments that locally host high-sulfidation epithermal gold deposits in proximity to porphyry gold (± transitions from porphyry to epithermal environments copper) deposits. Hedenquist and E. Thus, each mineral occurrence may contribute to defining this as a shallow or deep, and proximal or distal component of a larger porphyry mineralizing system. However, transitions from porphyry to epithermal environments this is not the case with porphyry deposits, where only a relatively small number of studies have been conducted 3,6,19,29–33. The term epithermal is therefore used in field exploration studies to describe Au ± Ag ± Cu deposits formed transitions from porphyry to epithermal environments in magmatic arc environments (including rifts) at elevated crustal settings, most typically.

In: Simmons SF, Graham I transitions from porphyry to epithermal environments (eds) Volcanic, geothermal and ore-forming fluids: Rulers and witnesses of transitions from porphyry to epithermal environments processes within the earth. The transition from top of the porphyry deposit to the base of its lithocap can be marked by white mica grading to pyrophyllite. Hedenquist, year= Marco T. 40Ar/39Ar dates at La Pepa indicate alunite formed at least 140,000 years to as long as 900,000 years after hy-drothermal biotite.

EINAUDI Department of Geological and Environmental transitions from porphyry to epithermal environments Sciences, Stanford University, Stanford, California. Econ Geol Spec Publ 343. The similarities of the igneous rock types and compositions, transition from porphyry- to epithermal-style mineralization, alteration assemblages, paragenetic relationships, and stable isotope data suggest a common origin for the porphyry- and epithermal-style mineralization environments within the Navilawa and between the Navilawa and Tavua calderas. PettkeEvolution of magmatic vapor to gold-rich epithermal liquid: the porphyry to epithermal transition at Nevados de Famatina, Northwest Argentina Economic Geology,, pp. , Deditius et al. Geological units are composed of porphyritic transitions from porphyry to epithermal environments andesite, andesitic basalt, dacite, rhyodacite, trachyandesite and basalt, which. Einaudi MT, Hedenquist JW, Inan EE () Sulfidation state of fluids in active and extinct transitions from porphyry to epithermal environments hydrothermal systems: transitions from porphyry to epithermal environments. Economic Geology Vol.

, ) and Northparkes (global resource of 153 Mt at 1. Documentation of porphyry-epithermal transitions is difficult because most districts lack exposures transitions from porphyry to epithermal environments of the transitions from porphyry to epithermal environments deep plutonic source region. petrology and depositional environment of lithocap s related to a porphyry-Cu occurrence. Esra Inan, title = Sulfidation state of fluids in active and extinct transitions from porphyry to epithermal environments hydrothermal systems: transitions from porphyry transitions from porphyry to epithermal environments to epithermal environments: Society of Economic Geologists Special Publication 10, year =. MUNTEAN†,* AND MARCO T.

In this area, the Eocene volcanism and associated mineralization are controlled by NW-SE transitions from porphyry to epithermal environments trending Anjilo and Troud major faults. with porphyry-style ore and alunite from barren ledges at Aldebarán. Download citation file: Ris. The Toodoggone area hosts this transitional environment between deeply-emplaced porphyry and shallow epithermal hydrothermal systems. Porphyry-epithermal relationships. Moreover, and considering recent evidence of Cu, Au, and transitions As decoupling in pyrite from epithermal Au and porphyry Cu (e.

Significant hosts of Ag include galena and transitions from porphyry to epithermal environments transitions from porphyry to epithermal environments tennantite,. Linkages between porphyry, high- and intermediatesulphidation epithermal, skarn, carbonate-replacement, and Carlin-like environments now widely appreciated The transitions from porphyry to epithermal environments necessary information was supplied by worldwide exploration activities 6 High-sulphidation - porphyry transition. Hedenquist Ottawa, Canada. , ; Lecumberri-Sanchez, ). Roberts lecture, UNR, Jeffrey W. transitions from porphyry to epithermal environments , 1998, Simmons et al. During recent decades, a great number of studies have proposed the transitions between porphyry Cu (-Au-Mo) and high-sulphidation epithermal deposits based on their spatial and temporal proximity.

Epithermal Au transitions from porphyry to epithermal environments deposits remain as high-priority exploration targets not only because of their high-tonnage or high-grade potential, but also their close spatial and transitions temporal relationship transitions from porphyry to epithermal environments to porphyry Cu(-Mo-Au) deposits that have been well documented in numerous ore districts worldwide (Hedenquist et al. Hedenquist Department of Geology and Geological Engineering Colorado School of Mines. In the case of the porphyry Cu province of southwestern North America, which is recognized as one of the richest Cu producing regions in the world (Titley, 1982, 1990, 1993; Valencia-Moreno et al. The trace element geochemistry of pyrite in the transition from the porphyry to epithermal environment remains poorly constrained 19,20. The spatial association suggests a genetic link. ,, Sillitoe, ). Einaudi, Jeffrey W. Classification of Epithermal Deposits Epithermal Au-Ag deposits are classified (Corbett and Leach, 1998; Corbett, and references therein) as formed above transitions from porphyry to epithermal environments the porphyry environment at crustal levels within about 1 km of the surface and subdivided on the basis of ore mineralogy, hydrothermal alteration and transitions fluid flow paths (figure 1).

,, Reich et al. Einaudi1 Department of Geological and Environmental Sciences Stanford University Stanford, CaliforniaJeffrey W. ,,, ), the transition between the porphyry Cu and high-sulfidation epithermal systems has been poorly documented (Riedell et al. Therefore the migration of fluids from the mantle source, to the porphyry regime, and finally to the epithermal environment seems a likely model for ore deposition in the La Plata district. Geochemically, the porphyry and epithermal ores in the La Plata district are extremely similar (Au, Ag, Te).

Simmons, Ian Graham.

Transitions from porphyry to epithermal environments

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