投影片 1
... below the volcanic edifice. Cool ocean water is drawn into the hydrothermal zone and is heated by the volcanic rock and is then expelled into the ocean, the process enriching the hydrothermal fluid in sulfur and metal ions. The ore materials are trapped within a fumarole field or a black smoker fiel ...
... below the volcanic edifice. Cool ocean water is drawn into the hydrothermal zone and is heated by the volcanic rock and is then expelled into the ocean, the process enriching the hydrothermal fluid in sulfur and metal ions. The ore materials are trapped within a fumarole field or a black smoker fiel ...
Nickel - IGuruadvice.com
... In terms of supply, the Sudbury region of Ontario, Canada, produces about 30 percent of the world's supply of nickel. The Sudbury Basin deposit is theorized to have been created by a massive meteorite impact event early ni the geologic history of Earth . Russia contains about 40% of the world's know ...
... In terms of supply, the Sudbury region of Ontario, Canada, produces about 30 percent of the world's supply of nickel. The Sudbury Basin deposit is theorized to have been created by a massive meteorite impact event early ni the geologic history of Earth . Russia contains about 40% of the world's know ...
Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario
... medium-sized, typically mafic/ultramafic layered intrusions. In Ni-Cu sulphide deposits (the first type), Ni constitutes the main economic commodity, generally at grades of about 1 to 3 percent. Copper may be either a coproduct or by-product, and Co, PGE, and Au are the usual by-products. However, i ...
... medium-sized, typically mafic/ultramafic layered intrusions. In Ni-Cu sulphide deposits (the first type), Ni constitutes the main economic commodity, generally at grades of about 1 to 3 percent. Copper may be either a coproduct or by-product, and Co, PGE, and Au are the usual by-products. However, i ...
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... group of ca. 1350 Ma northwest-striking dikes (Thomas, 2006) and massive synrift intrusions are required to explain the linear gravity high (Fig. 1) and the seismic velocity structure of the aulacogen (Keller and Baldridge, 1995). Surface geological observations and crustal-scale geophysical experim ...
... group of ca. 1350 Ma northwest-striking dikes (Thomas, 2006) and massive synrift intrusions are required to explain the linear gravity high (Fig. 1) and the seismic velocity structure of the aulacogen (Keller and Baldridge, 1995). Surface geological observations and crustal-scale geophysical experim ...
McLelland, JM, Selleck, BW, and Bickford, ME, 2010
... by DeWolf and Mezger (1994) for other rocks closer to the Grenville Front. The issue remains unresolved. An extensive record of Paleoproterozoic arcs along the Laurentian margin is preserved northwest of Sudbury (Fig. 3), where ca. 1.7 Ga granitoids within the Killarney magmatic belt are inferred to ...
... by DeWolf and Mezger (1994) for other rocks closer to the Grenville Front. The issue remains unresolved. An extensive record of Paleoproterozoic arcs along the Laurentian margin is preserved northwest of Sudbury (Fig. 3), where ca. 1.7 Ga granitoids within the Killarney magmatic belt are inferred to ...
Figs 3.4 - Geoscience Australia
... eastern Pilbara Craton (Pinga Creek, Cooglegong, WA). The pegmatites are interpreted to have been emplaced during two periods: an early phase at 2890 Ma to 2880 Ma and a later phase at between 2840 Ma to 2830 Ma (Sweetapple and Collins, 2002). Carbonatite complexes comprising stocks and dykes are pr ...
... eastern Pilbara Craton (Pinga Creek, Cooglegong, WA). The pegmatites are interpreted to have been emplaced during two periods: an early phase at 2890 Ma to 2880 Ma and a later phase at between 2840 Ma to 2830 Ma (Sweetapple and Collins, 2002). Carbonatite complexes comprising stocks and dykes are pr ...
Sedimentary record of the tectonic growth of a collisional continental
... Wrangellia composite terrane and are well preserved in southcentral Alaska (Fig. 1B; Trop et al., 2002). The Nutzotin basin, the focus of this study, consists of at least 6 km of Upper JurassicLower Cretaceous sedimentary and volcanic strata that are preserved along the inboard margin (cratonward si ...
... Wrangellia composite terrane and are well preserved in southcentral Alaska (Fig. 1B; Trop et al., 2002). The Nutzotin basin, the focus of this study, consists of at least 6 km of Upper JurassicLower Cretaceous sedimentary and volcanic strata that are preserved along the inboard margin (cratonward si ...
A new look at the Altaids: A superorogenic complex in northern and
... Figure 1: Tectonic map of the Altaids. The map is based on a equidistant conical projection with the central meridian is 95° and the standard parallels are 1:15.0 and 2:85.0, latitude of origin is 30.0. It is essentially the same as the map in Fig. 6 of the first part of this paper (Şengör et al., 2 ...
... Figure 1: Tectonic map of the Altaids. The map is based on a equidistant conical projection with the central meridian is 95° and the standard parallels are 1:15.0 and 2:85.0, latitude of origin is 30.0. It is essentially the same as the map in Fig. 6 of the first part of this paper (Şengör et al., 2 ...
The Laramide Orogeny: What Were the Driving Forces?
... Alternatively, the absolute motion of the overriding plate may have been important for driving Laramide orogenesis (as in the retroarc thrusting model). The high rate of western advancement of the North American plate must have been driven by ridgepush from the Atlantic spreading-center or by basal ...
... Alternatively, the absolute motion of the overriding plate may have been important for driving Laramide orogenesis (as in the retroarc thrusting model). The high rate of western advancement of the North American plate must have been driven by ridgepush from the Atlantic spreading-center or by basal ...
The Laramide Orogeny - University of Nevada, Reno
... Alternatively, the absolute motion of the overriding plate may have been important for driving Laramide orogenesis (as in the retroarc thrusting model). The high rate of western advancement of the North American plate must have been driven by ridgepush from the Atlantic spreading-center or by basal ...
... Alternatively, the absolute motion of the overriding plate may have been important for driving Laramide orogenesis (as in the retroarc thrusting model). The high rate of western advancement of the North American plate must have been driven by ridgepush from the Atlantic spreading-center or by basal ...
Provenance of zircon of the lowermost sedimentary cover, Estonia
... KONSA, MARE and PUURA, VÄINÖ 1999. Provenance of zircon of the lowermost sedimentary cover, Estonia, East-European Craton. Bulletin of the Geological Society of Finland, Number 71, Part 2, 253-273. Bulk and accessory mineral composition of fresh and weathered crystalline rocks, and sedimentary depos ...
... KONSA, MARE and PUURA, VÄINÖ 1999. Provenance of zircon of the lowermost sedimentary cover, Estonia, East-European Craton. Bulletin of the Geological Society of Finland, Number 71, Part 2, 253-273. Bulk and accessory mineral composition of fresh and weathered crystalline rocks, and sedimentary depos ...
THE TECTONIC RELATIONSHIPS OF THE HILLABEE CHLORITE
... Mountain Formation (Neathery, 1975). Bearce (1973b) subdivided the northern Talladega Group into three units: the Heflin Phyllite, the Abel Gap Formation, and the Chulafinnee Schist. Tull (1977) interpreted the Hollins Line fault as a major thrust fault and included the Hillabee within the Talladeg ...
... Mountain Formation (Neathery, 1975). Bearce (1973b) subdivided the northern Talladega Group into three units: the Heflin Phyllite, the Abel Gap Formation, and the Chulafinnee Schist. Tull (1977) interpreted the Hollins Line fault as a major thrust fault and included the Hillabee within the Talladeg ...
ABSTRACT The gneiss complex around and north of Pouso Alegre
... gneisses with amphibolite bodies in the form of layers or boudins. A later group of gneisses which also make up the complex comprises relatively leucocratic rocks ranging from tonalitic and granodioritic to granitic augen gneiss containing schlieren of mafic composition and at times fragments of dig ...
... gneisses with amphibolite bodies in the form of layers or boudins. A later group of gneisses which also make up the complex comprises relatively leucocratic rocks ranging from tonalitic and granodioritic to granitic augen gneiss containing schlieren of mafic composition and at times fragments of dig ...
THE SIGNIFICANCE OF THE METAMORPHIC ROCKS OF TIMOR
... on the northern side of the island. The southern margin of this massif is composed of deformed crinoidal limestone and volcanic rocks of Permian age (Maubisse facies of Audley-Charles, 1968) associated with slate, which is by far the most important lithology of this massif. Towards the north coast c ...
... on the northern side of the island. The southern margin of this massif is composed of deformed crinoidal limestone and volcanic rocks of Permian age (Maubisse facies of Audley-Charles, 1968) associated with slate, which is by far the most important lithology of this massif. Towards the north coast c ...
Field Relationships and Kinematic Indicators in the Virgin River
... The VRSZ (Lewry and Sibbald, 1977), the Black Lake Shear Zone (Gilboy, 1980) and the Tulemalu Fault Zone (Tella and Eade, 1986) are components of what is now collectively called the Snowbird Tectonic Zone {Hoffman, 1988). This major zone, extending 3 000 km from the Rocky Mountains in southern Alber ...
... The VRSZ (Lewry and Sibbald, 1977), the Black Lake Shear Zone (Gilboy, 1980) and the Tulemalu Fault Zone (Tella and Eade, 1986) are components of what is now collectively called the Snowbird Tectonic Zone {Hoffman, 1988). This major zone, extending 3 000 km from the Rocky Mountains in southern Alber ...
An Investigation of the carbonatites of the Kaapvaal Craton and their
... Province; the Keweenawan LIP; and, the Bushveld Igneous Complex (BIC) (Ernst and Bell, 2009). As may be expected from the association of carbonatites with rift related occurrences like large igneous provinces (LIP’s), a significant proportion of known carbonatites are associated with extensional env ...
... Province; the Keweenawan LIP; and, the Bushveld Igneous Complex (BIC) (Ernst and Bell, 2009). As may be expected from the association of carbonatites with rift related occurrences like large igneous provinces (LIP’s), a significant proportion of known carbonatites are associated with extensional env ...
(VMS) Deposits - Department of Natural Resources
... olcanogenic massive sulphide (VMS) deposits are one of the most common families of mineral deposits on earth. They consist of irregularly-shaped, tabular bodies of nearly 100% sulphides within volcanic host rocks. Pyrite is generally the most abundant sulphide, though many non-Newfoundland deposits ...
... olcanogenic massive sulphide (VMS) deposits are one of the most common families of mineral deposits on earth. They consist of irregularly-shaped, tabular bodies of nearly 100% sulphides within volcanic host rocks. Pyrite is generally the most abundant sulphide, though many non-Newfoundland deposits ...
Exhumation of high-pressure rocks beneath the Solund Basin
... from its exposure of (i) one of the rare syn-kinematic plutons in the Norwegian Caledonides, the Sogneskollen granodiorite (Skjerlie et al., 2000); (ii) a nearly complete stack of the Caledonian nappes and overlying sediments; and (iii) an excellent structural section from the WGC up through the Upp ...
... from its exposure of (i) one of the rare syn-kinematic plutons in the Norwegian Caledonides, the Sogneskollen granodiorite (Skjerlie et al., 2000); (ii) a nearly complete stack of the Caledonian nappes and overlying sediments; and (iii) an excellent structural section from the WGC up through the Upp ...
The western margin of Mexico is ideally - Earth Science
... compressional processes operating entirely within the upper plate of a long-lived subduction zone that dipped east under the Mexican margin. This process controlled crustal growth by continental margin rifting and addition of new igneous and volcaniclastic material during extension, followed by acc ...
... compressional processes operating entirely within the upper plate of a long-lived subduction zone that dipped east under the Mexican margin. This process controlled crustal growth by continental margin rifting and addition of new igneous and volcaniclastic material during extension, followed by acc ...
The Exposed Passive Margin of North America in Western Cuba
... present NE Yucatan coast. The evolution of these passive margin successions encompasses the syn-rift stage (Early Jurassic?Callovian/early Oxfordian), drift stage (?Callovian/middle Oxfordian-Santonian), and the beginning of the active margin stage (Campanian-Paleocene). Prior to the middle Oxfordia ...
... present NE Yucatan coast. The evolution of these passive margin successions encompasses the syn-rift stage (Early Jurassic?Callovian/early Oxfordian), drift stage (?Callovian/middle Oxfordian-Santonian), and the beginning of the active margin stage (Campanian-Paleocene). Prior to the middle Oxfordia ...
Evolution of the southeastern Lachlan Fold Belt in Victoria
... deep-marine sedimentary rocks and their metamorphic equivalents. Underlying Cambrian volcanics are only exposed along and near the western margin of the terrane, although their presence in the Narooma area of southern New South Wales (Miller & Gray 1997) suggests that they may be widespread beneath ...
... deep-marine sedimentary rocks and their metamorphic equivalents. Underlying Cambrian volcanics are only exposed along and near the western margin of the terrane, although their presence in the Narooma area of southern New South Wales (Miller & Gray 1997) suggests that they may be widespread beneath ...
VOLCANIC-HOSTED MASSIVE SULPHIDE DEPOSITS
... <1 mt to >16 mt up to 15% Zn, 8% Pb,1.5% Cu, Au, Ag ...
... <1 mt to >16 mt up to 15% Zn, 8% Pb,1.5% Cu, Au, Ag ...
Destruction of the North China Craton
... Figure 4 CCP stacked receiver function images of the crust and lithospheric mantle along six profiles. Red and blue denote positive and negative amplitude of the receiver functions as annotated in the color bar, which indicate a velocity increase or decrease with depth, respectively. The black dots ...
... Figure 4 CCP stacked receiver function images of the crust and lithospheric mantle along six profiles. Red and blue denote positive and negative amplitude of the receiver functions as annotated in the color bar, which indicate a velocity increase or decrease with depth, respectively. The black dots ...
Possible Mesozoic sediments in fault and brecciation zones in
... similarly trending faults in this part of Mid Norway, such as the Tarva and Dolmsundet faults along the southern margin of the Frohavet Basin (Bøe 1991, Sommaruga & Bøe 2002), may be associated with the MTFC.The Dolmsundet fault can be traced from the northeast into the narrow sound Dolmsundet betwe ...
... similarly trending faults in this part of Mid Norway, such as the Tarva and Dolmsundet faults along the southern margin of the Frohavet Basin (Bøe 1991, Sommaruga & Bøe 2002), may be associated with the MTFC.The Dolmsundet fault can be traced from the northeast into the narrow sound Dolmsundet betwe ...
An Overview of the Structure and Evolution of the Ouachita Orogenic
... triple junction with the Ouachita Orogen Belt in the vicinity of Dallas. The Late Paleozoic structures near this junction are very complex. ...
... triple junction with the Ouachita Orogen Belt in the vicinity of Dallas. The Late Paleozoic structures near this junction are very complex. ...
Yilgarn Craton
The Yilgarn Craton is a large craton that constitutes the bulk of the Western Australian land mass. It is bounded by a mixture of sedimentary basins and Proterozoic fold and thrust belts. Zircon grains in the Jack Hills, Narryer Terrane have been dated at ~4.27 Ga, with one detrital zircon dated as old as 4.4 Ga.