Author
Richard J. Goldfarb
Other affiliations: Denver Federal Center, University of Western Australia, United States Geological Survey ...read more
Bio: Richard J. Goldfarb is an academic researcher from China University of Geosciences (Beijing). The author has contributed to research in topics: Terrane & Craton. The author has an hindex of 48, co-authored 148 publications receiving 11462 citations. Previous affiliations of Richard J. Goldfarb include Denver Federal Center & University of Western Australia.
Topics: Terrane, Craton, Precambrian, Metamorphism, Metallogeny
Papers published on a yearly basis
Papers
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TL;DR: The orogenic gold deposits were formed during compressional to transpressional deformation processes at convergent plate margins in accretionary and collisional orogens as discussed by the authors, with gold deposition from 15-20 km to the near surface environment.
1,600 citations
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TL;DR: Orogenic gold deposits have formed over more than 3 billion years of Earth's history, episodically during the MiddleArchean to younger Precambrian, and continuously throughout the Phanerozoic as discussed by the authors.
1,125 citations
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01 Jan 2005
TL;DR: Gold deposits in metamorphic terranes include those of the Precambrian shields (approx 23,000-25,000 t Au), particularly the Late Archean greenstone belts and Paleoproterozoic fold belts, and of the late NeoproTERozoic and younger Cordilleran-style orogens (approximately 22,000t lode and 15,500 t placer Au), mainly along the margins of Gondwana, Laurentia, and the more recent circum-Pacific) as mentioned in this paper.
Abstract: Epigenetic gold deposits in metamorphic terranes include those of the Precambrian shields (approx 23,000–25,000 t Au), particularly the Late Archean greenstone belts and Paleoproterozoic fold belts, and of the late Neoproterozoic and younger Cordilleran-style orogens (approx 22,000 t lode and 15,500 t placer Au), mainly along the margins of Gondwana, Laurentia, and the more recent circum-Pacific. Ore formation was concentrated during the time intervals of 2.8 to 2.55 Ga, 2.1 to 1.8 Ga, and 600 to 50 Ma. Prior to the last 25 years, ores were defined by grades of 5 to 10 g/t Au in underground mines; present-day economics, open-pit
mining, and improved mineral processing procedures allow recovery of ores of ≤1 g/t Au, which has commonly
led to the recent reworking of lower grade zones in many historic orebodies. Most of these deposits formed
synchronously with late stages of orogeny and are best classified as orogenic gold deposits, which may be subdivided into epizonal, mesozonal, and hypozonal subtypes based on pressure-temperature conditions of ore formation.
A second type of deposit, termed intrusion-related gold deposits, developed landward of Phanerozoic accreted terranes in the Paleozoic of eastern Australia and the Mesozoic of the northern North American Cordillera. These have an overall global distribution that is still equivocal and are characterized by an intimate genetic association with relatively reduced granitoids. The majority of gold deposits in metamorphic terranes are located adjacent to first-order, deep-crustal fault zones, which show complex structural histories and may extend along strike for hundreds of kilometers with widths of as much as a few thousand meters. Fluid migration along such zones was driven by episodes of major pressure fluctuations during seismic events. Ores formed as vein fill of second- and third-order shears and faults, particularly at jogs or changes in strike along the crustal fault zones. Mineralization styles vary from stockworks and breccias in shallow, brittle regimes, through laminated crack-seal veins and sigmoidal vein arrays in brittle-ductile crustal regions, to replacement- and disseminated-type orebodies in deeper, ductile environments (i.e., a continuum model). Most orogenic gold deposits occur in greenschist facies rocks, but significant orebodies can be present in lower and higher grade rocks. Deposits typically formed on retrograde portions of pressure-temperature-time paths and thus are discordant to metamorphic features within host
rocks. Spatial association between gold ores and granitoids of all compositions reflects a locally favorable structural
trap, except in the case of the intrusion-related gold deposits where there is a clearer genetic association.
World-class orebodies are generally 2 to 10 km long, about 1 km wide, and are mined downdip to depths of 2 to 3 km. Most orogenic gold deposits contain 2 to 5 percent sulfide minerals and have gold/silver ratios from 5 to 10 and gold fineness >900. Arsenopyrite and pyrite are the dominant sulfide minerals, whereas pyrrhotite is more important in higher temperature ores and base metals are not highly anomalous. Tungsten-, Bi-, and Te-bearing mineral phases can be common and are dominant in the relatively sulfide poor intrusion-related gold deposits. Alteration intensity, width, and assemblage vary with the host rock, but carbonates, sulfides,muscovite, chlorite, K-feldspar, biotite, tourmaline, and albite are generally present, except in high-temperature systems where alteration halos are dominated by skarnlike assemblages. The vein-forming fluids for gold deposits in metamorphic environments are uniquely CO2 and 18O rich, with low to moderate salinities. Phanerozoic and Paleoproterozic ores show a mode of formation temperatures at 250° to 350°C, whereas Late Archean deposits cluster at about 325° to 400°C. However, there are also many important lower and higher temperature deposits deposited throughout the continuum of depths that range between 2 and 20 km. Ore fluids were, in most cases, near-neutral pH, slightly reduced, and dominated by sulfide
complexes. Globally consistent ore-fluid δ18O values of 6 to 13 per mil and δD values of –80 to –20 per mil
generally rule out a significant meteoric water component in the gold-bearing hydrothermal systems. Sulfur
isotope measurements on ore-related sulfide minerals are concentrated between 0 and 10 per mil, but with many higher and much lower exceptions, indicating variable sulfur sources and an unlikely dominant role for mantle sulfur. Drastic pressure fluctuations with associated fluid unmixing and/o rdesulfidation during water/rock interaction are the two most commonly called-upon ore precipitation mechanisms. The specific model(s) for gold ore genesis remains controversial. Although the direct syngenetic models of the 1970s are no longer applicable, the gold itself may be initially added into the volcanic and sedimentary crustal rock sequences, probably within marine pyrite, during sea-floor hydrothermal events. Gold transport
and concentration are most commonly suggested to be associated with metamorphic processes, as indicated by
the volatile composition of the hydrothermal fluids, the progressive decrease in concentration of elements enriched
in the gold deposits with increasing metamorphic grade of the country rocks, and the common association of ores with medium-grade metamorphic environments. Gold deposits of typically relatively low grade, which formed directly from fluid exsolution during granitoid emplacement within metamorphic rocks, are now also clearly recognized (i.e., intrusion-related gold deposits), but there are limited definitive data to implicate such an exsolved fluid source for most gold deposits within orogenic provinces. The fact that orogenic gold deposits are associated with all types of igneous rocks is a problem to a pure magmatic model. Hybrid models, where slab-derived fluids may generate rising melts that drive devolatilization reactions in the lower crust, are also feasible. Although involvement of a direct mantle fluid presents geochemical difficulties, the presence of lamprophyres and deep-crustal faults in many districts suggests potential mantle influence in the overall, largescale tectonic event controlling the hydrothermal flow system.
944 citations
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TL;DR: Gold-dominant intrusion-related deposits are a less coherent group of deposits, which are mainly Phanerozoic in age, and include a few world-class, but no unequivocal giant, examples as discussed by the authors.
Abstract: Metamorphic belts are complex regions where accretion or collision has added
to, or thickened, continental crust. Gold-rich deposits can be formed at all
stages of orogen evolution, so that evolving metamorphic belts contain diverse
gold deposit types that may be juxtaposed or overprint each other. This partly
explains the high level of controversy on the origin of some deposit types,
particularly those formed or overprinted/remobilized during the major
compressional orogeny that shaped the final geometry of the hosting metamorphic
belts. These include gold-dominated orogenic and intrusion-related deposits, but
also particularly controversial gold deposits with atypical metal associations. Orogenic lode gold deposits of Middle Archean to Tertiary age are arguably
the predominant gold deposit type in metamorphic belts, and include several
giant (>250 t Au) and numerous world-class (>100 t Au) examples. Their
defining characteristics and spatial and temporal distributions are now
relatively well documented, such that other gold deposit types can be compared
and contrasted against them. They form as an integral part of the evolution of
subduction-related accretionary or collisional terranes in which the host-rock
sequences were formed in arcs, back arcs, or accretionary prisms. Current
unknowns for orogenic gold deposits include the following: (1) the precise
tectonic setting and age of mineralization in many provinces, particularly in
Paleozoic and older metamorphic belts; (2) the source of ore fluids and metals;
(3) the precise architecture of the hydrothermal systems, particularly the
relationship between first- and lower-order structures; and (4) the specific
depositional mechanisms for gold, particularly for high-grade deposits. Gold-dominant intrusion-related deposits are a less coherent group of
deposits, which are mainly Phanerozoic in age, and include a few world-class,
but no unequivocal giant, examples. They have many similarities to orogenic
deposits in terms of metal associations, wall-rock alteration assemblages, ore
fluids, and, to a lesser extent, structural controls, and hence, some deposits,
particularly those with close spatial relationships to granitoid intrusions,
have been placed in both orogenic and intrusion-related categories by different
authors. Those that are clearly intrusion-related deposits appear to be best
distinguished by their near-craton setting, in locations more distal from
subduction zones than most orogenic gold deposits and in provinces that also
commonly contain Sn and/or W deposits; relatively low gold grades (<1–2
g/t Au); and district-scale zoning to Ag-Pb-Zn deposits in distal zones.
Outstanding problems for intrusion-related deposits include the following: (1)
lack of a clear definition of this apparently diverse group of deposits, (2)
lack of a definitive link for ore fluids and metals between mineralization and
magmatism, (3) the diverse nature of both petrogenetic association and redox
state of the granitoids invoked as the source of mineralization, and (4)
mechanisms for exsolution of the CO 2 -rich ore fluids from the
relatively shallow level granitoids implicated as ore-fluid sources. Gold deposits with atypical metal associations are a particularly diverse and
controversial group, are most abundant in Late Archean terranes, and include
several world-class to giant examples. Most are probably modified Cu-Mo-Au
porphyry, volcanic rock-hosted Zn-Pb-Ag-Au massive sulfide, or Zn-Pb-Ag-Au or
Ba-Au-Mo-Hg submarine epithermal systems, overprinted or remobilized during the
events in which orogenic gold deposits formed, but there is lack of consensus on
genesis. Outstanding problems for these deposits include the following: (1) lack
of a clear grouping of distinctive deposits, (2) lack of published, well
integrated studies of their characteristics, (3) generally a poorly defined
timing of mineralization events, and (4) lack of assessment of metal mass
balances in each stage of the complex mineralization and overprinting events. Both orogenic gold deposits and gold deposits with atypical metal
associations contain a few giant and numerous world-class examples, whereas the
intrusion-related group contains very few world-class examples, and no giants,
unless Muruntau is included in this group. Preliminary analysis suggests that
the parameters of individual world-class to giant gold deposits of any type show
considerable variation, and that it is impossible to define critical factors
that control their size and grade at the deposit scale. However, there appears
more promise at the terrane to province scale where there are greater
indications of common factors such as anomalous subduction-related tectonic
settings, reactivated crustal-scale deformation zones that focus porphyry-lamprophyre
dike swarms in linear volcanosedimentary belts, complex regional-scale geometry
of mixed lithostratigraphic packages, and evidence for multiple mineralization
or remobilization events. There are a number of outstanding problems for all types of gold deposits in
metamorphic belts. These include the following: (1) definitive classifications,
(2) unequivocal recognition of fluid and metal sources, (3) understanding of
fluid migration and focusing at all scales, (4) resolution of the precise role
of granitoid magmatism, (5) precise gold-depositional mechanisms, particularly
those producing high gold grades, and (6) understanding of the release of CO 2 -rich
fluids from subducting slabs and subcreted oceanic crust and granitoid magmas at
different crustal levels. Research needs to be better coordinated and more
integrated, such that detailed fluid-inclusion, trace-element, and isotopic
studies of both gold deposits and potential source rocks, using cutting-edge
technology, are embedded in a firm geological framework at terrane to deposit
scales. Ultimately, four-dimensional models need to be developed, involving
high-quality, three-dimensional geological data combined with integrated
chemical and fluid-flow modeling, to understand the total history of the
hydrothermal systems involved. Such research, particularly that which can
predict superior targets visible in data sets available to exploration companies
before discovery, has obvious spin-offs for global- to deposit-scale targeting
of deposits with superior size and grade in the covered terranes that will be
the exploration focus of the twenty-first century.
730 citations
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641 citations
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TL;DR: The Central Asian Orogenic Belt ( c. 1000-250 Ma) formed by accretion of island arcs, ophiolites, oceanic islands, seamounts, accretionary wedges, and oceanic plateaux and microcontinents in a manner comparable with that of circum-Pacific Mesozoic-Cenozoic orogens is studied in this article.
Abstract: The Central Asian Orogenic Belt ( c . 1000–250 Ma) formed by accretion of island arcs, ophiolites, oceanic islands, seamounts, accretionary wedges, oceanic plateaux and microcontinents in a manner comparable with that of circum-Pacific Mesozoic–Cenozoic accretionary orogens. Palaeomagnetic and palaeofloral data indicate that early accretion (Vendian–Ordovician) took place when Baltica and Siberia were separated by a wide ocean. Island arcs and Precambrian microcontinents accreted to the active margins of the two continents or amalgamated in an oceanic setting (as in Kazakhstan) by roll-back and collision, forming a huge accretionary collage. The Palaeo-Asian Ocean closed in the Permian with formation of the Solonker suture. We evaluate contrasting tectonic models for the evolution of the orogenic belt. Current information provides little support for the main tenets of the one- or three-arc Kipchak model; current data suggest that an archipelago-type (Indonesian) model is more viable. Some diagnostic features of ridge–trench interaction are present in the Central Asian orogen (e.g. granites, adakites, boninites, near-trench magmatism, Alaskan-type mafic–ultramafic complexes, high-temperature metamorphic belts that prograde rapidly from low-grade belts, rhyolitic ash-fall tuffs). They offer a promising perspective for future investigations.
2,662 citations
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TL;DR: Porphyry Cu systems are the most widely distributed mineralization types at convergent plate boundaries, including porphyry deposits centered on intrusions; skarn, carbonate-replacement, and sediment-hosted Au deposits in increasingly peripheral locations; and superjacent high and intermediate-sulfidation epithermal deposits as mentioned in this paper.
Abstract: Porphyry Cu systems host some of the most widely distributed mineralization types at convergent plate boundaries, including porphyry deposits centered on intrusions; skarn, carbonate-replacement, and sediment-hosted Au deposits in increasingly peripheral locations; and superjacent high- and intermediate-sulfidation epithermal deposits. The systems commonly define linear belts, some many hundreds of kilometers long, as well as occurring less commonly in apparent isolation. The systems are closely related to underlying composite plutons, at paleodepths of 5 to 15 km, which represent the supply chambers for the magmas and fluids that formed the vertically elongate (>3 km) stocks or dike swarms and associated mineralization. The plutons may erupt volcanic rocks, but generally prior to initiation of the systems. Commonly, several discrete stocks are emplaced in and above the pluton roof zones, resulting in either clusters or structurally controlled alignments of porphyry Cu systems. The rheology and composition of the host rocks may strongly influence the size, grade, and type of mineralization generated in porphyry Cu systems. Individual systems have life spans of ~100,000 to several million years, whereas deposit clusters or alignments as well as entire belts may remain active for 10 m.y. or longer.
The alteration and mineralization in porphyry Cu systems, occupying many cubic kilometers of rock, are zoned outward from the stocks or dike swarms, which typically comprise several generations of intermediate to felsic porphyry intrusions. Porphyry Cu ± Au ± Mo deposits are centered on the intrusions, whereas carbonate wall rocks commonly host proximal Cu-Au skarns, less common distal Zn-Pb and/or Au skarns, and, beyond the skarn front, carbonate-replacement Cu and/or Zn-Pb-Ag ± Au deposits, and/or sediment-hosted (distal-disseminated) Au deposits. Peripheral mineralization is less conspicuous in noncarbonate wall rocks but may include base metal- or Au-bearing veins and mantos. High-sulfidation epithermal deposits may occur in lithocaps above porphyry Cu deposits, where massive sulfide lodes tend to develop in deeper feeder structures and Au ± Ag-rich, disseminated deposits within the uppermost 500 m or so. Less commonly, intermediate-sulfidation epithermal mineralization, chiefly veins, may develop on the peripheries of the lithocaps. The alteration-mineralization in the porphyry Cu deposits is zoned upward from barren, early sodic-calcic through potentially ore-grade potassic, chlorite-sericite, and sericitic, to advanced argillic, the last of these constituting the lithocaps, which may attain >1 km in thickness if unaffected by significant erosion. Low sulfidation-state chalcopyrite ± bornite assemblages are characteristic of potassic zones, whereas higher sulfidation-state sulfides are generated progressively upward in concert with temperature decline and the concomitant greater degrees of hydrolytic alteration, culminating in pyrite ± enargite ± covellite in the shallow parts of the litho-caps. The porphyry Cu mineralization occurs in a distinctive sequence of quartz-bearing veinlets as well as in disseminated form in the altered rock between them. Magmatic-hydrothermal breccias may form during porphyry intrusion, with some of them containing high-grade mineralization because of their intrinsic permeability. In contrast, most phreatomagmatic breccias, constituting maar-diatreme systems, are poorly mineralized at both the porphyry Cu and lithocap levels, mainly because many of them formed late in the evolution of systems.
Porphyry Cu systems are initiated by injection of oxidized magma saturated with S- and metal-rich, aqueous fluids from cupolas on the tops of the subjacent parental plutons. The sequence of alteration-mineralization events charted above is principally a consequence of progressive rock and fluid cooling, from >700° to <250°C, caused by solidification of the underlying parental plutons and downward propagation of the lithostatic-hydrostatic transition. Once the plutonic magmas stagnate, the high-temperature, generally two-phase hyper-saline liquid and vapor responsible for the potassic alteration and contained mineralization at depth and early overlying advanced argillic alteration, respectively, gives way, at <350°C, to a single-phase, low- to moderate-salinity liquid that causes the sericite-chlorite and sericitic alteration and associated mineralization. This same liquid also causes mineralization of the peripheral parts of systems, including the overlying lithocaps. The progressive thermal decline of the systems combined with synmineral paleosurface degradation results in the characteristic overprinting (telescoping) and partial to total reconstitution of older by younger alteration-mineralization types. Meteoric water is not required for formation of this alteration-mineralization sequence although its late ingress is commonplace.
Many features of porphyry Cu systems at all scales need to be taken into account during planning and execution of base and precious metal exploration programs in magmatic arc settings. At the regional and district scales, the occurrence of many deposits in belts, within which clusters and alignments are prominent, is a powerful exploration concept once one or more systems are known. At the deposit scale, particularly in the porphyry Cu environment, early-formed features commonly, but by no means always, give rise to the best ore-bodies. Late-stage alteration overprints may cause partial depletion or complete removal of Cu and Au, but metal concentration may also result. Recognition of single ore deposit types, whether economic or not, in porphyry Cu systems may be directly employed in combination with alteration and metal zoning concepts to search for other related deposit types, although not all those permitted by the model are likely to be present in most systems. Erosion level is a cogent control on the deposit types that may be preserved and, by the same token, on those that may be anticipated at depth. The most distal deposit types at all levels of the systems tend to be visually the most subtle, which may result in their being missed due to overshadowing by more prominent alteration-mineralization.
2,211 citations
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TL;DR: The orogenic gold deposits were formed during compressional to transpressional deformation processes at convergent plate margins in accretionary and collisional orogens as discussed by the authors, with gold deposition from 15-20 km to the near surface environment.
1,600 citations
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TL;DR: In this paper, a new type of global plate motion model consisting of a set of continuously-closing topological plate polygons with associated plate boundaries and plate velocities since the break-up of the supercontinent Pangea is presented.
1,519 citations
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TL;DR: Orogenic gold deposits have formed over more than 3 billion years of Earth's history, episodically during the MiddleArchean to younger Precambrian, and continuously throughout the Phanerozoic as discussed by the authors.
1,125 citations