HuBLE-UK: Hudson Bay Lithospheric Experiment
... The region is underlain by the largest continental root on Earth and is the site of one of the largest negative geoid anomalies (Figure 1); it is also characterized by a broad high-velocity zone illuminated in global tomographic models (Figure 2). Only part of the gravity anomaly can be attributed t ...
... The region is underlain by the largest continental root on Earth and is the site of one of the largest negative geoid anomalies (Figure 1); it is also characterized by a broad high-velocity zone illuminated in global tomographic models (Figure 2). Only part of the gravity anomaly can be attributed t ...
presentation source
... The Main Central Thrust brings the highly metamorphosed Indian platform (in blue) onto a less metamorphic domain of schistose low-grade rocks. The MCT and the Main Boundary Thrust have accommodated a few hundred kilometers of convergence between India and Tibet since the beginning of the collision. ...
... The Main Central Thrust brings the highly metamorphosed Indian platform (in blue) onto a less metamorphic domain of schistose low-grade rocks. The MCT and the Main Boundary Thrust have accommodated a few hundred kilometers of convergence between India and Tibet since the beginning of the collision. ...
Morocco, 23-27 March 2015
... The main granitoid rocks of Zenga inlier originated during the Palaeoproterzoic Eburnian event, and were overprinted during the Pan-African orogeny. Some petrostructural studies (Ennih et al., 1999; 2001) aimed to determine the interference between Eburnian and Pan-African orogenic deformation and t ...
... The main granitoid rocks of Zenga inlier originated during the Palaeoproterzoic Eburnian event, and were overprinted during the Pan-African orogeny. Some petrostructural studies (Ennih et al., 1999; 2001) aimed to determine the interference between Eburnian and Pan-African orogenic deformation and t ...
TGI-4 Intrusion-related Mineralization Project
... Mo, W and Sn, plus major sources of Au, Ag, and PGEs. Worldwide they account for over 50% of Cu and 95% of Mo production. In Canada, they account for over 40% of Cu and about 25% of Au production. Porphyry deposits are large, low- to medium-grade deposits in which mineralisation is hosted within and ...
... Mo, W and Sn, plus major sources of Au, Ag, and PGEs. Worldwide they account for over 50% of Cu and 95% of Mo production. In Canada, they account for over 40% of Cu and about 25% of Au production. Porphyry deposits are large, low- to medium-grade deposits in which mineralisation is hosted within and ...
Cordilleran History
... Nevadan (Jurassic) Sevier (Cretaceous) Laramide (Late Cretaceous - Eocene) ...
... Nevadan (Jurassic) Sevier (Cretaceous) Laramide (Late Cretaceous - Eocene) ...
Latest Cretaceous basin formation within the Salinian terrane of
... deposited. The strata of the Salinian show characteristics of way marine facies (features of a depositional environment) grading into non-marine facies, suggesting deposition within fan-delta and sub-marine fan complexes. Ancient flow indicators known as paleocurrents, hint that the offshore directi ...
... deposited. The strata of the Salinian show characteristics of way marine facies (features of a depositional environment) grading into non-marine facies, suggesting deposition within fan-delta and sub-marine fan complexes. Ancient flow indicators known as paleocurrents, hint that the offshore directi ...
Lecture 8
... and Metamorphic Rocks • However field evidence suggests that granitic continental crust was not original and must have increased in volume through time. • Original crust was thin and mainly basalt. Weathering, erosion and igneous activity converted some of the original crust to granite to form embry ...
... and Metamorphic Rocks • However field evidence suggests that granitic continental crust was not original and must have increased in volume through time. • Original crust was thin and mainly basalt. Weathering, erosion and igneous activity converted some of the original crust to granite to form embry ...
Economic Geology
... This course is taught to the third year students in one 15-week semester. It is a 4 credit unit course with 2 hours of lectures and 2 contact hours of practicals per week. ...
... This course is taught to the third year students in one 15-week semester. It is a 4 credit unit course with 2 hours of lectures and 2 contact hours of practicals per week. ...
Economic Geology Course Name: Economic Geology Course Code
... Course Outline Types and Genesis of Ore Bodies Ore and gangue minerals, ore reserves, grade and cut-off grade of ore, syngenetic and epigenetic ore deposits, ore formation processes to include; magmatic, hydrothermal, metamorphic and surface (sedimentary and volcanic exhalative) processes, modes of ...
... Course Outline Types and Genesis of Ore Bodies Ore and gangue minerals, ore reserves, grade and cut-off grade of ore, syngenetic and epigenetic ore deposits, ore formation processes to include; magmatic, hydrothermal, metamorphic and surface (sedimentary and volcanic exhalative) processes, modes of ...
Abstract
... cleavage. Late normal faults were widespread and overprinted by strike-slip faulting. The Aileu Complex comprises meta-sediments interleaved with amphibolite and lherzolite, which range in grade from greenschist to upper amphibolite facies. A pervasive layer-parallel fabric is indicative of north-ve ...
... cleavage. Late normal faults were widespread and overprinted by strike-slip faulting. The Aileu Complex comprises meta-sediments interleaved with amphibolite and lherzolite, which range in grade from greenschist to upper amphibolite facies. A pervasive layer-parallel fabric is indicative of north-ve ...
Unconformity-Associated U - Ministry of Energy and Mines
... metamorphosed basement rocks. In arid or semi-arid environments surticial deposits may be present in the overburden. The deposits have affinities to “Classical” U veins (115). COMMENTS: Virtually all the known unconformity-associated uranium deposits are found in the Athabasca Basin, Alligator River ...
... metamorphosed basement rocks. In arid or semi-arid environments surticial deposits may be present in the overburden. The deposits have affinities to “Classical” U veins (115). COMMENTS: Virtually all the known unconformity-associated uranium deposits are found in the Athabasca Basin, Alligator River ...
The Kaapvaal craton (South Africa): no evidence for a supercontinental
... developed while growth and stabilization of the craton were still underway. Accretion of relatively small composite granite-gneiss-greenstone (island arc complex) terranes from both N and W, does not support formation of a Neoarchean supercontinent, but may well have been related to a mantle plume w ...
... developed while growth and stabilization of the craton were still underway. Accretion of relatively small composite granite-gneiss-greenstone (island arc complex) terranes from both N and W, does not support formation of a Neoarchean supercontinent, but may well have been related to a mantle plume w ...
Palaeoproterozoic Crustal Evolution of the Southern Eyre Peninsula
... investigate processes controlling and contributing to the growth and destruction of continental crust. Integration of geochemical, isotopic, structural and metamorphic evidence places first order constraints not only the rate and volume of crustal addition, but also broad limits on rates and process ...
... investigate processes controlling and contributing to the growth and destruction of continental crust. Integration of geochemical, isotopic, structural and metamorphic evidence places first order constraints not only the rate and volume of crustal addition, but also broad limits on rates and process ...
Material properties and microstructure from
... Cordillera clearly shows a pairing of highstanding orogenic welts, the Coast belt to the west and the Omineca belt to the east, separated by the intervening subdued topography of the Intermontane belt. How closely this reflects the Meoszoic orogenic architecture for the southern Canadian Cordillera ...
... Cordillera clearly shows a pairing of highstanding orogenic welts, the Coast belt to the west and the Omineca belt to the east, separated by the intervening subdued topography of the Intermontane belt. How closely this reflects the Meoszoic orogenic architecture for the southern Canadian Cordillera ...
UNCONFORMITY-ASSOCIATED U 116
... metamorphosed basement rocks. In arid or semi-arid environments surticial deposits may be present in the overburden. The deposits have affinities to “Classical” U veins (115). COMMENTS: Virtually all the known unconformity-associated uranium deposits are found in the Athabasca Basin, Alligator River ...
... metamorphosed basement rocks. In arid or semi-arid environments surticial deposits may be present in the overburden. The deposits have affinities to “Classical” U veins (115). COMMENTS: Virtually all the known unconformity-associated uranium deposits are found in the Athabasca Basin, Alligator River ...
Chapter 10
... indicating that the basin was connected to the sea. • This restricted basin is called a barred basin because it has a bar or sill between it and the sea. • Sea water flows into the basin over the bar. • Evaporation produces dense brines, which sink to the bottom. When the brine becomes sufficiently ...
... indicating that the basin was connected to the sea. • This restricted basin is called a barred basin because it has a bar or sill between it and the sea. • Sea water flows into the basin over the bar. • Evaporation produces dense brines, which sink to the bottom. When the brine becomes sufficiently ...
Are lithospheres forever?
... samples along a 1000-km traverse across several terranes of both Archaean and Proterozoic age. Mapping based on garnet and chromite concentrates from >50 kimberlites along this trend shows that within-craton domains with distinctive mantle stratigraphy coincide with crustal terranes mapped at the su ...
... samples along a 1000-km traverse across several terranes of both Archaean and Proterozoic age. Mapping based on garnet and chromite concentrates from >50 kimberlites along this trend shows that within-craton domains with distinctive mantle stratigraphy coincide with crustal terranes mapped at the su ...
Petrogenesis of Oxidized Arfvedsonite Granite Gneiss from Dimra
... and various trace element ratio together with oxidized nature (∆NNO: +2) of these granites further suggest that these have been derived from OIB–type parental magma. The peralkaline nature of the granite and its lack of subduction- related geochemical features are consistent with an origin in a zone ...
... and various trace element ratio together with oxidized nature (∆NNO: +2) of these granites further suggest that these have been derived from OIB–type parental magma. The peralkaline nature of the granite and its lack of subduction- related geochemical features are consistent with an origin in a zone ...
The French Massif Central is the south-vergent
... while metatexites in the core with an assemblage biotite + fibrolite + cordierite(?) are up-grade from the muscovite-out isograd and indicate temperatures over 650 C. The metamorphic grade also increases from east to west in Le Caroux. Unfortunately, the low-Al bulk composition of these rocks does ...
... while metatexites in the core with an assemblage biotite + fibrolite + cordierite(?) are up-grade from the muscovite-out isograd and indicate temperatures over 650 C. The metamorphic grade also increases from east to west in Le Caroux. Unfortunately, the low-Al bulk composition of these rocks does ...
Mineral Deposits in India
... genetic model for the sediment-hosted Au-As deposits. Rich Goldfarb and others reviewed some of the key global characteristics of orogenic gold deposits along with their significance in the Indian context. Dan Kontak and Richard Horne presented a global model for the slate-hosted gold mineralization ...
... genetic model for the sediment-hosted Au-As deposits. Rich Goldfarb and others reviewed some of the key global characteristics of orogenic gold deposits along with their significance in the Indian context. Dan Kontak and Richard Horne presented a global model for the slate-hosted gold mineralization ...
WEST AFRICAN CRATON West Africa, an area roughly the size of
... geochemical characteristics typical of tholeiitic (oceanic) suites. Many of the flows are massive although pillow structures are preserved in some localities. Younger intermediate to felsic volcanics of calc-alkaline affinity, including pyroclastics, are generally subordinate; this appears to be the ...
... geochemical characteristics typical of tholeiitic (oceanic) suites. Many of the flows are massive although pillow structures are preserved in some localities. Younger intermediate to felsic volcanics of calc-alkaline affinity, including pyroclastics, are generally subordinate; this appears to be the ...
Evaluating the provenance of metasedimentary rocks of the
... Zhongtiao Mountain (Fig. 1). Rock types include various muscovite schist, quartz schist and biotite schist. Their petrological characteristics were listed in Li et al. (2008b). Major elements were acquired through the analysis of fused glass discs using a scanning wavelength dispersion X-ray fluore ...
... Zhongtiao Mountain (Fig. 1). Rock types include various muscovite schist, quartz schist and biotite schist. Their petrological characteristics were listed in Li et al. (2008b). Major elements were acquired through the analysis of fused glass discs using a scanning wavelength dispersion X-ray fluore ...
MINERALOGICAL MAGAZINE Metamorphic Fluids and Mineral
... and modest CO2 at T > 200 ~ and high geothermal gradients are a common feature of many gold deposits but that host rock and structural-metamorphic characteristics are highly variable from one deposit to the next. Metamorphic devolatilisation associated with the greenschist-amphiborite facies transit ...
... and modest CO2 at T > 200 ~ and high geothermal gradients are a common feature of many gold deposits but that host rock and structural-metamorphic characteristics are highly variable from one deposit to the next. Metamorphic devolatilisation associated with the greenschist-amphiborite facies transit ...
The Geological and Tectonic Framework of Europe
... rocks. Recent U-Pb zircon dating has shown that these range from 3,125 Ma to c.2,700 Ma. The rocks were subject to deformation at middle to lower crustal levels under granulite and upper amphibolite facies conditions during the Scourian event between c.2,650 Ma to 2,480 Ma. The Archaean architecture ...
... rocks. Recent U-Pb zircon dating has shown that these range from 3,125 Ma to c.2,700 Ma. The rocks were subject to deformation at middle to lower crustal levels under granulite and upper amphibolite facies conditions during the Scourian event between c.2,650 Ma to 2,480 Ma. The Archaean architecture ...
Geology and petrography of Adolerite dyke, Hyderabad granitic
... ABSTRACT The 2.5 billion years Hyderabad granitic region (HGR), covering an area of ~ 150 x 150 km over the eastern part of the Eastern Dharwar Craton (EDC) , is considered as largest granitic pluton of Indian subcontinent. (S.B. Singh, et.al).Region of this batholithic craton is composed with grani ...
... ABSTRACT The 2.5 billion years Hyderabad granitic region (HGR), covering an area of ~ 150 x 150 km over the eastern part of the Eastern Dharwar Craton (EDC) , is considered as largest granitic pluton of Indian subcontinent. (S.B. Singh, et.al).Region of this batholithic craton is composed with grani ...
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.