Geology and age of the Parguaza rapakivi granite, Venezuela
The 1,550-m.y.-old Paraguaza granite of the northwestern Guayana Shield in Venezuela represents one of the larger, apparently anorogenic rapakivi intrusive rocks of the world.
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 …
22 Chrontour's Parguaza granite shows a crystallization …
Download scientific diagram | 22 Chrontour's Parguaza granite shows a crystallization history of >100 Ma (Mirón-Valdespino and Álvarez 1997). Reproduced with permission from publication: The ...
The Los Pijiguaos bauxite deposit (Venezuela): A
The Los Pijiguaos bauxite, located at the northwestern edge of the Guayana Shield in Venezuela, is a lateritic bauxite developed on a Precambrian Rapakivi Granite …
Redalyc. PETROGRAFÍA, GEOQUÍMICA Y …
Se caracteriza por presentar textura rapakivi tipo wiborgita y piterlita, su composición es granítica a granítica de feldespato alcalino. Además de las variaciones composicionales y texturales, se encuentran zonas de grano fino, diques pegmatíticos, aplíticos y venas de cuarzo. Geoquímicamente se clasifica como un granito tipo A ...
(PDF) Petrography, Geochemistry and Geochronology of Parguaza Granite …
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.
(PDF) Petrography, Geochemistry and Geochronology of Parguaza Granite …
Petrography, Geochemistry and Geochronology of Parguaza Granite in Colombia. Thomas Cramer. 2013, Boletin de Geología. See Full PDF Download PDF. See Full PDF ...
Model for bauxite formation: Los Pijiguaos, Venezuela
3895, Caracas 1010-A, Venezuela. The objective of this study is to bring out a. model for bauxite formation on the Parguaza. Rapakivi Granite that can explain the mineralogy, textures and ...
Structural signatures of the Amazonian Craton in
In Colombia, the Parguaza Granite exposures are limited to the left margin of the Orinoco River and isolated hills surrounded by recent deposits. Also, other Parguaza-like bodies were identified to the south, intruded within rocks of the Mitú Complex (Bruneton et al., 1983; De la Espriella et al., 1990; Bonilla et al., 2016).
(PDF) Ambiente geológico del Complejo Mitú y perspectivas …
the Parguaza Granite, whereas the Guainía Department seems to exhibit some Nb and to a lesser extent Ta, which are mainly associated with granitic pegmatites or acid dykes and stocks that intrude ...
Charnockita con fayalita (bauchita) y su relación con el …
Charnockita con fayalita (bauchita) y su relación con el Granito del Parguaza. Sebastián J Grande. 2013, Geos Revista Venezolana De Ciencias De La Tierra. See Full PDF Download PDF. See Full PDF Download PDF. Related …
Venezuela's Mining Arc boom sweeps up Indigenous people …
The Parguaza region in Bolívar state is known for its mineral wealth, much of it largely unexplored. Photo by Bram Ebus. Article published by Glenn Scherer. Amazon Conservation, ...
PETROGRAPHY, GEOCHEMISTRY AND GEOCHRONOLOGY OF PARGUAZA GRANITE …
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 …
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). …
Petrografía del Granito de Parguaza y otras Rocas …
El Precambrico alli esta representado principalmente por el Granito de Parguaza, que aflora en la region como montes isla. Es. La zona de estudio esta localizada al nororiente de la Comisaria del Vichada, en una extenslon de algo mas de 4.000 Km 2 . El Precambrico alli esta representado principalmente por el Granito de Parguaza, que aflora en ...
MAGMATISMO RAPAKIVI EN LA CUENCA MEDIA DEL RÍO …
El Granito de Parguaza es considerado como uno de los granitos anorogénicos más grandes del mundo, puesto que aflora a lo largo del margen continental del río Orinoco y se extiende desde el territorio venezolano hasta el extremo oriental de Colombia formando así parte de las rocas del Escudo Guyanés.
PETROGRAPHY, GEOCHEMISTRY AND GEOCHRONOLOGY OF PARGUAZA GRANITE …
petrography, geochemistry and geochronology of parguaza granite in colombia. petrography, geochemistry and geochronology of parguaza granite in colombia
(PDF) Modelado gravimétrico de posibles cuerpos intrusivos …
Granite samples (76) collected from an area of 3000 km2 in Selangor and Negri Sembilan in Peninsular Malaya were analysed for Rb, Sr, Ba, Zr, Sn, W and Nb. Contour maps drawn from the trace ...
Petrogenesis of the igneous Mucajaí AMG complex
The ~ 4000 km 2 Mucajaí AMG complex (Fig. 1 a; Fraga et al., 2009a) in Roraima (Brazil) is a part of a northwest trending ~ 900-km-long belt of rapakivi granite intrusions in the northern Amazonian Craton (Dall'Agnol et al., 1999).Besides Mucajaí, these rocks comprise the rapakivi granite of Parguaza (Fig. 1 b; Gaudette et al., 1978, …
Chemical composition of the Parguaza granite | Download …
On suitable trace-element discrimination diagrams, Parguaza sample plots in the fields char- acteristic of A-type and within-plate granites. ...
Petrogenesis of the igneous Mucajaí AMG complex
Coeval rocks are also described in Venezuela (Parguaza Rapakivi Granite) (Gaudette et al., 1978) and at the boundary between Venezuela and Brazil, known as Surucucus Suite (Dall'Agnol et al., 1975).
Table 1 Representative electron microprobe analyses of …
The composition of ilmen- ite is identical to that of the Parguaza granite (see Table 1). An unidentified iron-oxyhydroxide phase analyzed contains, in addition to 10 wt.% Al 2 O 3, almost 4 wt.% ...
Amed BONILLA PEREZ | Doctor of Geosciences | Geologist
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 ...
PETROGRAPHY, GEOCHEMISTRY AND GEOCHRONOLOGY OF PARGUAZA GRANITE …
dc.creator: Bonilla-Pérez, Amed: dc.creator: Frantz, José Carlos: dc.creator: Charão-Marques, Juliana: dc.creator: Cramer, Thomas: dc.creator: Franco-Victoria ...
The Proterozoic Basement of the Western Guiana Shield …
The Parguaza granite is the most conspicuous representative example, but the Mitú, Içana, Atabapo and other granites are from the same time interval, and typical Parguaza-like rapakivi granites (Mucajaí, Surucucus) also occur much further east in the shield (Dall'Agnol et al. 1994, 1999). There is no link with any coeval metamorphic belt ...
Petrografía del granito de parguaza y otras rocas …
The Precambrian there consists mainly of the Parguaza Granite, which outcrops in the region as Inselbergs. The granite es rapakiwl-type; Its characteristics are: texturally It is composed of ovoid potash feldespar that may or may not be surrounded by a plagioclase ring within a matrix composed by quartz and colored minerals; with respect to ...
Chemical composition of the Parguaza granite | Download …
Download Table | Chemical composition of the Parguaza granite from publication: The geometry and anatomy of the Los Pijiguaos bauxite deposit, Venezuela | The Los Pijiguaos bauxite mine in the ...
Paleomagnetic and rock magnetic evidence for inverse
Rosalia granite and the Parguaza batholith, the Sipapo granodiorite and the Marieta granite. It is not possible to determine if the Santa Rosalia granite is older or younger than the Parguaza batholith, nor the position of the Guayapo rhyo- dacites in the sequence of relative ages. Using mineralogical, geochemical and visual analysis of ...
The geometry and anatomy of the Los Pijiguaos bauxite …
Los Pijiguaos represents a typical laterite bauxite deposit that formed on a flat topped plateau from weathering of the underlying mid-Proterozoic Rapakivi-type …
Perisai Guyana
Perisai Guyana mendasari Guyana (sebelumnya Guyana Inggris), Suriname (sebelumnya Guyana Belanda) dan Guyana Prancis (atau Guyana), sebagian besar Venezuela selatan, serta bagian dari Kolombia, dan Brasil. Batuan di Guyana Shield terdiri dari metasedimen dan metavolkanik ( batu hijau) yang dilapisi oleh lapisan sub-horizontal Batu pasir ...
Petrology, Geochemistry, and Metallogenic Potential of …
The Parguaza Granite is located in eastern Colombia and is Mesoproterozoic in age, with a rapakivi texture (rapakivi granite) with granular plagioclase and potassic feldspar. Skeletal quartz can be confused with myrmekitic textures but corresponds to different crystallization
Clasificación de las rocas del Granito de Parguaza; nótese el …
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 …
Redalyc.PETROGRAFÍA, GEOQUÍMICA Y …
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
(PDF) COLTÁN .pdf | Arley Ochoa
Detrital zircons from the A-horizon (duricrust) revealed a similar age span of 1525 My, which is coeval with the Parguaza Batholith reported in Venezuela, whereas ages of 1415 My of zircons from the C-horizon (regolith) coincide with the local Parguaza Rapakivi Granite ages (1340-1402 My).
UNITED STATES DEPARTMENT OF THE INTERIOR U.S.
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 …
The Precambrian drift history and paleogeography of Amazonia
The Parguaza granite was previously dated at 1.54 Ga by Gaudette et al. (1978); but more recent dating for granites in Colombia, supposedly belonging to the Parguaza rapakivi Complex, yielded younger ages of 1.40–1.39 Ga for this Complex (Bonilla-Pérez et al., 2013).
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