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Showing 1 to 20 of 74 for “"greenstone"”.
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Magnetotelluric measurements across the southern Barberton Greenstone Belt, South Africa
Der Barberton Grünsteingürtel (BGB) in Südafrika gehört zu den wenigen Regionen mit noch gut erhaltener Archaischer Kruste. Seit Jahrhunderten wurde der BGB eingehend untersucht und seine geologischen und tektonischen Strukturen detailliert kartiert. Über die tiefere Struktur des BGB ist hingegen …
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Tectono-hydrothermal evolution of the Neoarchean Abitibi greenstone belt, Canada
… assemblage of the Neoarchean Abitibi greenstone belt of Ontario and Quebec, Canada. The deposits of the Timiskaming assemblage include deep-water turbidites, alluvial-fluvial conglomerates and sandstones, as well as alkalic volcanic and intrusive rocks. The sedimentary and volcanic …
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Geology of an Archean Greenstone Belt at Point Lake, Northwest Territories, Canada
… well-preserved circa 2.6 Ga Archean granite-greenstone belts are exposed in the Slave Province of Northwest Territories, Canada. At Point Lake, a "supracrustal sequence" comprised mainly of mafic volcanic and metasedimentary rocks lies over and east of a granitoid gneissic terrane. Field and …
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Seismic Imaging of a Granitoid-Greenstone Boundary in the Paleoarchean Pilbara Craton
… where vertical, low-grade metamorphism basaltic greenstone keels surround large granitic (TTG) domes. The dominant model for 3.5-3.2 Ga deformation in the Pilbara is gravity-driven vertical tectonics, or partial convective overturn in a hot crust. In this model, the granitic bodies rose upward as …
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Geochemistry and petrology of the Lake Vermilion Formation, Ely Greenstone Belt, northeastern Minnesota
<p> Alteration in the Lake Vermilion Formation took place at low water/rock ratios. Calculations using the method of Grescens (1967) indicate that the amount of open-system elemental exchange was slight. During secondary alteration, Ca, Na, K, Rb, Sr, and Ba were very mobile; Mg and Fe were less …
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Aspects of the geochemistry of Onverwacht Group lavas from the Barberton Greenstone Belt
… lavas in the Onverwacht Group (Barberton greenstone belt) crop out in the rugged terrain of the eastern Transvaal lowveld. The results of an investigation into the geochemistry of the lavas, mainly from the three lower Formations of the Onverwacht Group - the Lower Ultramafic Unit (LUU) - …
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Integrated seismic interpretation of the Larder Lake area, Southern Abitibi greenstone belt, Ontario, Canada
The southern Abitibi greenstone belt is characterized by a series of complex metavolcanic and metasedimentary rocks intruded by granitic plutons and batholiths, which makes the area a hardrock environment. In the Larder Lake area, these stratigraphic units are truncated by two major breaks, the …
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Geology and Geochemistry of Muyexe Magnesite Deposit, Giyani Greenstone Belt, Limpopo Province, South Africa
… magnesite deposit is situated in the Giyani Greenstone Belt in South Africa. Despite mining activities currently taking place at Muyexe magnesite deposit, little information is available about the geology and geochemistry of the deposit. This has resulted in a gap of information about the …
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Volcanic framework and geochemical evolution of the Archean Hope Bay Greenstone Belt, Nunavut, Canada
… of the Slave Structural Province, the Hope Bay Greenstone Belt is a 82 km long north-striking sequence of supracrustal rocks dominated by mafic volcanic rocks with lesser felsic volcanic and sedimentary rocks. Mapping of two transects in the southern section and two transects in the northern …
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Characterization of the mineralized albitite bodies at Biggejavri, Kautokeino Greenstone Belt, Finnmark, Northern Norway
The Kautokeino Greenstone Belt in Finnmark, Northern Norway is host to the Biggejavri U-REE occurrence and the Bidjovagge Cu-Au deposit. The Biggejavri U-REE occurrence is hosted in albitite lenses within the amphibolite unit of the Suoluvuopmi Formation whereas the Bidjovagge Cu-Au deposit is …
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Geology of the Archean Côté Gold Au(-Cu) intrusion-related deposit, Swayze Greenstone Belt, Ontario
… 0.3 g/t Au. The deposit is located in the Swayze greenstone belt (SGB), part of the larger and gold-rich Abitibi Subprovince and is the first large gold deposit to be discovered in the SGB. The deposit is hosted by multi-phase tonalite, diorite and quartz diorite intrusions of the Chester …
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Geochemistry and petrogenesis of unaltered and altered volcanic sequences in the southern Abitibi greenstone belt
The Abitibi greenstone belt is a volcanic-plutonic dominated subprovince of the Archean Superior structural province. In the southern volcanic zone (SVZ) of the Abitibi greenstone belt, there are numerous, well preserved, komatiite-tholeiite sequences in fault-bounded tectonostratigraphic terranes, …
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Structural, geophysical and geochemical characterisation of a Mesoarchean paleosuture zone, Barberton Greenstone Belt, South Africa
… of the subsurface below the Barberton Greenstone Belt (BGB) reveal two electrically conductive zones that extend to a depth of at least 5km. These high conductivity zones correlate well with regional shear zones geologically mapped at surface. The serpentinised Stolzburg Layered …
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Geologic evolution of the Archean Buhwa Greenstone Belt and surrounding granite-gneiss terrane, southcentral Zimbabwe
The Archean (~3.0 Ga) Buhwa Greenstone Belt, and surrounding granite-gneiss terrane, is the least understood major greenstone belt in the Archean Zimbabwe Craton, despite occupying a critical position between an early Archean continental nucleus and the Limpopo Belt. The cover succession in the …
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Geochemical investigation of the hydrothermal alteration zone surrounding the greenstone-hosted Fazenda Brasileiro gold deposit, Bahia, Brasil
Includes bibliographical references (pages 380-393).
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Geochemical investigation of the hydrothermal alteration zone surrounding the greenstone-hosted Fazenda Brasileiro gold deposit, Bahia, Brasil
Includes bibliographical references (pages 380-393).
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Trace Element Geochemistry of Volcanogenic Massive Sulfide Deposits in Archean Greenstone Belts: Implications for Metal Endowment and Geodynamic Settings
The Neoarchean greenstone belts of the Canadian Superior Province host world-class Au and base metal (Cu-Zn-Pb) massive sulfide deposits with distinct geological features, including a wide range of different host rocks and crustal settings. The range of settings is reflected in the trace metal …
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