Parguaza Granite - osems.eu
The Parguaza Granite outcrops in the Vichada department oF Colombia, towards the Orinoco River margin, where it conForms a portion oF the large batholith described in Venezuela as Granito de El Parguaza.
Petrography, geochemistry and geochronology of Parguaza ...
The Parguaza Granite outcrops in the Vichada department of Colombia, towards the Orinoco River margin, where it conforms a portion of the large batholith described in Venezuela as Granito de El ...
The geometry and anatomy of the Los Pijiguaos bauxite ...
The Parguaza granite batholith covers an area in excess of 30,000 km 2 and, thus, belongs to the largest known Rapakivi-type intrusions (Rämö and Haapala, 1993). Radiometric dating by the Rb/Sr whole rock as well as U/Pb zircon methods yielded mid-Proterozoic ages of 1545±20 and 1532±39 Ma, respectively (Gaudette et al., 1978). The granite is conspicuous by the abundance of feldspar …
Geology and age of the Parguaza rapakivi granite ...
Research Article | September 01, 1978. Geology and age of the Parguaza rapakivi granite, Venezuela
Redalyc.Gravimetric modeling of the Parguaza granitic ...
KEY WORDS: Rapakivi granite, residual Bouguer anomaly, gravimetric modelling, cooling pattern, apparent ages. INTRODUCTION The Parguaza granites of the Venezuelan Guayana shield are massive coarse-grained rocks with U/Pb zircon ages of 1500 ± 25 Ga (Gaudette et al ., 1978). These granites represent the largest rapakivi intrusion in the world ...
Dissolution at dislocation etch pits in quartz - NASA/ADS
Analysis of a soil profile developed in situ on the Parguaza granite, Venezuela, revealed a gradual change from angular, pitted stone surfaces at the top of the profile to rounded surfaces on grains sampled just above bedrock.
The Los Pijiguaos bauxite deposit (Venezuela): A ...
May 01, 2000 · The Parguaza Granite is a large granitic batholith (>30,000 km 2) with an age of 1500–1550 Ma (Gaudette et al., 1978). Texturally, it is a massive, hypidimorphic granular, porphyritic, coarse-grained rapakivi granite, without any reported evidences of metamorphism ( Mendoza, 1975 , Gaudette et al., 1978 ).
Petrography, Geochemistry and Geochronology of Parguaza ...
The Parguaza Granite outcrops in the Vichada department of Colombia, towards the Orinoco River margin, where it conforms a portion of the large batholith described in Venezuela as Granito de El Parguaza.
Lake Leopoldo - Wikipedia
Lago Leopoldo (Lake Leopold) is a body of water located in the Venezuelan Amazon in the western-most range of the Guiana Shield. It measures about 320 m. (1050 ft) by and 240 m. (790 ft.) and up to 20 m.
(PDF) An explanation to the geology of Suriname
The greenstone belt is diapirically intruded by numerous TTG (tonalite-trondhjemite-granodiorite) bodies and the Armina Formation in turn by bi-mica and biotite granite bodies ( Bosma et al., 1983 ...
(PDF) PETROGRAFÍA, GEOQUÍMICA Y GEOCRONOLOGÍA DEL …
PETROGRAFÍA, GEOQUÍMICA Y GEOCRONOLOGÍA DEL GRANITO DE PARGUAZA EN COLOMBIA PETROGRAPHY, GEOCHEMISTRY AND GEOCHRONOLOGY OF PARGUAZA GRANITE IN …
Rapakivi granites from Brazil and adjacent areas ...
Read "Rapakivi granites from Brazil and adjacent areas, Precambrian Research" on DeepDyve, the largest online rental service for scholarly research with thousands of …
PETROGRAFÍA, GEOQUÍMICA Y GEOCRONOLOGÍA DEL GRANITO …
The Parguaza Granite outcrops in the Vichada department of Colombia, towards the Orinoco River margin, where it conforms a portion of the large batholith described in Venezuela as Granito de El Parguaza. This intrusion outcrops in Colombia as isolated inselberg hills and moderately extended mountain chains with abrupt slopes that protrude ...
UNITED STATES DEPARTMENT OF THE INTERIOR U.S. …
Middle Proterozoic, about 1,545 Ma, undeformed granite with rapakivi texture is characteristic of the Parguaza province. Tin in quartz veins, pegmatite, and greisen are mined elsewhere in the Guayana Shield; in Venezuela, moderate potential exists for discovery of tin associated with the Parguaza granite.
Genesis of pisoliths and of the Weipa Bauxite deposit ...
Genesis of pisoliths and of the Weipa Bauxite deposit, northern Australia G. TAYLOR1* AND R. A. EGGLETON2 1University of Canberra, ACT 2617, Australia. 2Cooperative Research Centre for Landscape Environments and Mineral Exploration, Department of Earth and Marine Sciences, Australian National University, ACT 0200, Australia.
U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT Geology of the ...
Yp - Parguaza Granite (Middle Proterozoic) Massive, coarsely crystalline, porphyritic granite and biotite granite commonly with rapakivi texture (about 1,545 Ma, Gaudette and others, 1978). The Parguaza Granite is reported by Mendoza and others (1977) and Ghosh (1985) to be unconformably overlain by the Roraima Group, although isotopic dates on
Guiana Shield - Wikipedia
The north-central part of the Guiana Highlands is dominated by high flat-topped peaks called tepuis, of the Roraima supergroup and Quasi-Roraima formation, and the rounded granite peaks of the Parguaza and Imataca complexes to the north and southwestern edges of the area.
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