Rhenium^Osmium Isotope and Platinum-Group Element
... anomaly studies show the intrusion extends northward for at least 250 km under younger cover where it becomes more laterally extensive (Fig. 1). The present exposure probably represents a thin, oblique slice through a much larger intrusion (Francis, 1994), with an estimated original volume in excess ...
... anomaly studies show the intrusion extends northward for at least 250 km under younger cover where it becomes more laterally extensive (Fig. 1). The present exposure probably represents a thin, oblique slice through a much larger intrusion (Francis, 1994), with an estimated original volume in excess ...
Open-system Behavior during Pluton^Wall
... wall-rock^pluton contact. Hydrothermal fluids emanating from the pluton can give rise to extensive mineralization zones in the country-rock, generating ore and skarn deposits in an outer metasomatic aureole (Lindgren, 1933). Reverse migration of fluids or certain elements, that is, from the wall-roc ...
... wall-rock^pluton contact. Hydrothermal fluids emanating from the pluton can give rise to extensive mineralization zones in the country-rock, generating ore and skarn deposits in an outer metasomatic aureole (Lindgren, 1933). Reverse migration of fluids or certain elements, that is, from the wall-roc ...
Metallogeny of the Gold Quadrilateral: style and characteristics of
... potential of the mineralizing fluids and host rocks. However, other characteristics are to be taken into account, such as the connection with deeper porphyry systems, the type and position of advanced argillic alteration assemblage, respectively the genesis of acid leaching-oxidized zones, the occur ...
... potential of the mineralizing fluids and host rocks. However, other characteristics are to be taken into account, such as the connection with deeper porphyry systems, the type and position of advanced argillic alteration assemblage, respectively the genesis of acid leaching-oxidized zones, the occur ...
nature and composition of the continental crust
... middle crust (i.e., between 10-15 and 20-25 km depth) may contain rocks in the amphibolite facies, which are also found in surface outcrop or as xenoliths. Amphibolite facies rocks may also be important in the lowermost crust in areas of high water flux (such as in island arc settings where hydrous ...
... middle crust (i.e., between 10-15 and 20-25 km depth) may contain rocks in the amphibolite facies, which are also found in surface outcrop or as xenoliths. Amphibolite facies rocks may also be important in the lowermost crust in areas of high water flux (such as in island arc settings where hydrous ...
Paleozoic–Mesozoic Porphyry Cu(Mo) and Mo(Cu) Deposits within
... other hand, some researchers consider the subduction-metasomatized mantle lithosphere as a possible source of Mo [3]. Copper is generally considered to be derived from the mantle [1,4]. Nevertheless, some researchers suggest a hybridized lower continental crustal source of Cu [5]. Porphyry Cu–Mo dep ...
... other hand, some researchers consider the subduction-metasomatized mantle lithosphere as a possible source of Mo [3]. Copper is generally considered to be derived from the mantle [1,4]. Nevertheless, some researchers suggest a hybridized lower continental crustal source of Cu [5]. Porphyry Cu–Mo dep ...
SECTION 1: - Limestone Landscapes
... As we explore Cleadon’s rocks we will see, not only how they can reveal our distant history, but also the remarkably varied uses to which they have been put ever since humans arrived here. To do so we will look not just at our local rocks, but at some we see everyday around the village that have bee ...
... As we explore Cleadon’s rocks we will see, not only how they can reveal our distant history, but also the remarkably varied uses to which they have been put ever since humans arrived here. To do so we will look not just at our local rocks, but at some we see everyday around the village that have bee ...
Fluid transfers at a basement/cover interface Part II
... of the Aquitaine Basin (France). Dolomite and calcite (and sometimes fluorite, barite and quartz) constitute most of the fracture fillings. They contain primary inclusions of brines having chlorinities in the range of 3.3 to 5.5 mol Cl/kg solution, with total homogenization temperatures in between 6 ...
... of the Aquitaine Basin (France). Dolomite and calcite (and sometimes fluorite, barite and quartz) constitute most of the fracture fillings. They contain primary inclusions of brines having chlorinities in the range of 3.3 to 5.5 mol Cl/kg solution, with total homogenization temperatures in between 6 ...
Geology and Mineral Resources of Mesa del Oro Quadrangle
... Many of the flows cap remnants of Cenozoic erosion surfaces cut on Triassic rocks, forming broad mesas, some of which cover areas of considerable size. At a few places in the southern and northwestern parts of the quadrangle, Upper Cretaceous rocks (Dakota?, Mancos, and Mesaverde) are exposed. Juras ...
... Many of the flows cap remnants of Cenozoic erosion surfaces cut on Triassic rocks, forming broad mesas, some of which cover areas of considerable size. At a few places in the southern and northwestern parts of the quadrangle, Upper Cretaceous rocks (Dakota?, Mancos, and Mesaverde) are exposed. Juras ...
Windsor Group (Late Mississippian) stratigraphy, Magdalen Islands
... in eastern Canada. The volcanic rocks, including vesicular and amygdaloidal basalts with minor pyroclastic rocks, are interstratified in surface exposures with middle Windsor Group gypsum, limestone, and siltstone of late Asbian age. Similar sedimentary suites higher in the Windsor Group, assigned b ...
... in eastern Canada. The volcanic rocks, including vesicular and amygdaloidal basalts with minor pyroclastic rocks, are interstratified in surface exposures with middle Windsor Group gypsum, limestone, and siltstone of late Asbian age. Similar sedimentary suites higher in the Windsor Group, assigned b ...
Explanatory memoir to accompany sheets 3,4,5 (in part), 9,10,11 (in
... There can be as little doubt ...
... There can be as little doubt ...
26. SULFUR ISOTOPE RECONNAISSANCE OF EPIGENETIC
... 4.7%). In Hole 319A, for example, the isotopic range for pyrite in two nearby samples (less than 28 cm apart) is 37.1°/oo, alone. Extreme isotopic variability is rarely noted in sulfides formed at intermediate to high temperatures (250°C and higher) in association with hydrothermal or magmatic proce ...
... 4.7%). In Hole 319A, for example, the isotopic range for pyrite in two nearby samples (less than 28 cm apart) is 37.1°/oo, alone. Extreme isotopic variability is rarely noted in sulfides formed at intermediate to high temperatures (250°C and higher) in association with hydrothermal or magmatic proce ...
sea-floor spreading -- the creation of oceanic crust
... ALL faulting takes place within the crust and within the rift. Therefore the band of epicenters is very narrow and the depths to foci very shallow ...
... ALL faulting takes place within the crust and within the rift. Therefore the band of epicenters is very narrow and the depths to foci very shallow ...
Tourmaline Isotopes: No Element Left Behind
... of geochemical information from subduction zones. These rocks are fragments of oceanic crust or of a continental margin that were subducted to depths of at least 50 kilometers and returned to the surface. Importantly, much of the exhumation of such rocks typically occurs while the subduction zone is ...
... of geochemical information from subduction zones. These rocks are fragments of oceanic crust or of a continental margin that were subducted to depths of at least 50 kilometers and returned to the surface. Importantly, much of the exhumation of such rocks typically occurs while the subduction zone is ...
Magnetic fabric and emplacement of dykes of lamprophyres and
... Numerous dykes of lamprophyres and various types of granitoid, syenitoid, dioritoid, and gabbroid porphyries of Variscan age crop out in the area of the Central Bohemian Plutonic Complex and adjacent high- to low-grade metamorphic units of the Moldanubian Zone and Teplá-Barrandian Unit. Magnetic fab ...
... Numerous dykes of lamprophyres and various types of granitoid, syenitoid, dioritoid, and gabbroid porphyries of Variscan age crop out in the area of the Central Bohemian Plutonic Complex and adjacent high- to low-grade metamorphic units of the Moldanubian Zone and Teplá-Barrandian Unit. Magnetic fab ...
Title of paper - Subterra-ing
... and tuffs, and sedimentary layers of shale, sandstones and conglomerates of lacustrine origin, interbedded. Coya-Machalí formation (local equivalent from Abanico formation; Klohn, 1960): is composed of pyroclastic breccias of wide range particle size, arranged in layers of variable thickness, with ...
... and tuffs, and sedimentary layers of shale, sandstones and conglomerates of lacustrine origin, interbedded. Coya-Machalí formation (local equivalent from Abanico formation; Klohn, 1960): is composed of pyroclastic breccias of wide range particle size, arranged in layers of variable thickness, with ...
Rhenium^Osmium Isotope and Platinum
... anomaly studies show the intrusion extends northward for at least 250 km under younger cover where it becomes more laterally extensive (Fig. 1). The present exposure probably represents a thin, oblique slice through a much larger intrusion (Francis, 1994), with an estimated original volume in excess ...
... anomaly studies show the intrusion extends northward for at least 250 km under younger cover where it becomes more laterally extensive (Fig. 1). The present exposure probably represents a thin, oblique slice through a much larger intrusion (Francis, 1994), with an estimated original volume in excess ...
Geology of the Kaikoura Area
... The geological map of the Kaikoura area (Fig. 1) is one of the national QMAP (Quarter million MAP; Nathan 1993) series produced by GNS Science. The series replaces the earlier 1:250 000 series geological maps covering the Kaikoura area (Lensen 1962; Bowen 1964; Gregg 1964). Since the publication of ...
... The geological map of the Kaikoura area (Fig. 1) is one of the national QMAP (Quarter million MAP; Nathan 1993) series produced by GNS Science. The series replaces the earlier 1:250 000 series geological maps covering the Kaikoura area (Lensen 1962; Bowen 1964; Gregg 1964). Since the publication of ...
Geology of the Kaikoura Area
... The geological map of the Kaikoura area (Fig. 1) is one of the national QMAP (Quarter million MAP; Nathan 1993) series produced by GNS Science. The series replaces the earlier 1:250 000 series geological maps covering the Kaikoura area (Lensen 1962; Bowen 1964; Gregg 1964). Since the publication of ...
... The geological map of the Kaikoura area (Fig. 1) is one of the national QMAP (Quarter million MAP; Nathan 1993) series produced by GNS Science. The series replaces the earlier 1:250 000 series geological maps covering the Kaikoura area (Lensen 1962; Bowen 1964; Gregg 1964). Since the publication of ...
Metallogeny of the Shilu FeâCoâCu deposit, Hainan Island, South
... Lancangjiang igneous zone. (b) Geological map of Hainan Island (after Guangdong BGMR, 1988; Zhang et al., 2011). ...
... Lancangjiang igneous zone. (b) Geological map of Hainan Island (after Guangdong BGMR, 1988; Zhang et al., 2011). ...
Physical Properties of Deep Drill Cores : Implications for
... Furthermore, physical properties provide insight into nature of the crustal structures as well as into fundamental Earth processes, such as impact cratering, the origin and source of the Earth’s magnetic field, and in tracing its history through geologic time (Carmichael, 1989). This data is require ...
... Furthermore, physical properties provide insight into nature of the crustal structures as well as into fundamental Earth processes, such as impact cratering, the origin and source of the Earth’s magnetic field, and in tracing its history through geologic time (Carmichael, 1989). This data is require ...
2015 Mining and Mineral Symposium
... It is now generally recognized that porphyry, high-sulfidation epithermal and lowsulfidation epithermal deposits can all form at one longer-lived magmatic center, even if probably not simultaneously (e.g. Hedenquist et al., 1998). The differences between these deposit types are not primarily the res ...
... It is now generally recognized that porphyry, high-sulfidation epithermal and lowsulfidation epithermal deposits can all form at one longer-lived magmatic center, even if probably not simultaneously (e.g. Hedenquist et al., 1998). The differences between these deposit types are not primarily the res ...
the texas grenville orogen, llano uplift, texas - Cin
... Packsaddle Domain. Supracrustal rocks of the Packsaddle domain in the eastern uplift consist of 1274-1243 Ma, metamorphosed volcanic, volcanoclastic, and sedimentary rocks interpreted to represent a marine basinal sequence (Reese et al., 2000) with a shallow-water, continental-margin depositional e ...
... Packsaddle Domain. Supracrustal rocks of the Packsaddle domain in the eastern uplift consist of 1274-1243 Ma, metamorphosed volcanic, volcanoclastic, and sedimentary rocks interpreted to represent a marine basinal sequence (Reese et al., 2000) with a shallow-water, continental-margin depositional e ...
SIGNIFICANT VOLCANIC CONTRIBUTION TO SOME QUARTZ
... volcanic and sedimentary rocks exposed on land in East Java were deposited on this accreted basement. Java is a volcanic island and contains the products of modern and older Cenozoic igneous activity. The volcanoes of the modern Sunda Arc are distributed along the length of the island (Fig. 1). A se ...
... volcanic and sedimentary rocks exposed on land in East Java were deposited on this accreted basement. Java is a volcanic island and contains the products of modern and older Cenozoic igneous activity. The volcanoes of the modern Sunda Arc are distributed along the length of the island (Fig. 1). A se ...
25 WORDS LIMESTONE Limestone is a sedimentary rock
... Limestone is a sedimentary rock composed largely of mineral calcite. It often contain silica in the form of flint and varying amounts of clay and sand as layers in the rock. Limestone contains different amounts of silica, clay, silt and sand. The primary source of the calcite in limestone is most m ...
... Limestone is a sedimentary rock composed largely of mineral calcite. It often contain silica in the form of flint and varying amounts of clay and sand as layers in the rock. Limestone contains different amounts of silica, clay, silt and sand. The primary source of the calcite in limestone is most m ...
The Lamington Conglomerate: further evidence for an ophiolitic
... lenticular bodies of microconglomerate is known locally as ‘Haggis Rock’. This microconglomerate is characterised by the presence of red, green-grey and black chert and mudstone fragments, but also contains granule to small pebble-sized clasts of basalt, quartz, intermediate to acidic igneous rock ( ...
... lenticular bodies of microconglomerate is known locally as ‘Haggis Rock’. This microconglomerate is characterised by the presence of red, green-grey and black chert and mudstone fragments, but also contains granule to small pebble-sized clasts of basalt, quartz, intermediate to acidic igneous rock ( ...
Igneous rock
Igneous rock (derived from the Latin word ignis meaning fire) is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava. Igneous rock may form with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. This magma can be derived from partial melts of pre-existing rocks in either a planet's mantle or crust. Typically, the melting is caused by one or more of three processes: an increase in temperature, a decrease in pressure, or a change in composition. Over 700 types of igneous rocks have been described, most of them having formed beneath the surface of Earth's crust.