Abstract. 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 ~ 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, …
Rb-Sr charnockitic melting curve, an estimated range of temperature- whole-rock analyses (Fig. 4) yield an isochron age for the rapakivi pressure conditions for the crystallization of the Parguaza rapakivi granite of 1,531 ± 39 m.y. (initial (Sr^/Sr 86 = 0.7004 ± 0.0019), granite would be f r o m 750 to 850 °C and from 1 to 3 kb.
Structural signatures of the Amazonian Craton in eastern Colombia from gravity and magnetometry data interpretation
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 Parguaza Granite outcrops in the Vichada department of Colombia, towards the Orinoco River margin, where it conforms a portion of the large batholith …
We report paleomagnetic and rock magnetic data from the rapakivi granites of the Parguaza batholith (Guyana Precambrian Shield, southwestern Venezuela). These …
El Parguaza granite is a huge batholith for which a U-Pb zircon . age of ca. 1550 Ma is reported (Tassinari et al., 1996). Santos (2003) reported a precise U-Pb SHRIMP age of 1551 ± 5 Ma for .
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 …
nom de granite Parguaza, qui fait partie de la pro- vince structurale du Cuchivero (Talukdar et al., 1978). Ce batholite appartient à l'événement orogénique le .
The extensive 1,550-m.y.-old Parguaza intrusion in Venezuela is correlated with 1,550-m.y.-old basement rocks underlying the Amazon Basin in Brazil and suggests a widespread "Parguazan" event 1,500 to 1,600 m.y. ago which affected a large part of the northwestern and southern Guayana Shield, extending as far south as the Guapore craton of ...
Charnockita con fayalita (bauchita) y su relación con el Granito del Parguaza
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).
In the model the funnel-shaped Parguaza pluton is shown as an approximately 8 km thick layered intrusion in which the western block has a variation of densities with depth from 2.80 g/cc (density ...
The area under study is located at the northeastern end of the Comisaría del Vichada, and covers a little more than 4000 square kilometers. 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 ...
Generalized geological map of Vichada and Guainía Department, eastern part of Colombia showing the localities (4, 5 and 6) (blue stars) and locality (2) (pink star) - from which localities (4–6) were selected for this study; locality (2) associated with the Parguaza Granite was studied by Franco Victoria, (2015) and is here shown for a ...
ABSTRACT 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 ...
Download scientific diagram | Clasificación de las rocas del Granito de Parguaza; nótese el amplio rango composicional (Streckeisen 1967) from publication: Petrography, geochemistry and ...
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.
El Granito de Parguaza aflora en el departamento del Vichada (Colombia), hacia el margen del Rio Orinoco y es parte del gran batolito descrito en Venezuela como Granito de Parguaza. Este cuerpo en Colombia aflora como cerros aislados tipo inselberg y serranias de poca extension con pendientes abruptas que sobresalen entre las extensas llanuras ...
The Parguaza Granite outcrops in the Vichada department of Colombia, towards the Orinoco River margin, where it conforms a portion …
petrografÍa, geoquÍmica y geocronologÍa del granito de parguaza en colombia petrografÍa, geoquÍmica y geocronologÍa del granito de parguaza en colombia MAGMATISMO RAPAKIVI EN LA CUENCA MEDIA DEL RÍO INÍRIDA, DEPARTAMENTO DE GUAIN...
PETROGRAFÍA, GEOQUÍMICA Y GEOCRONOLOGÍA DEL GRANITO DE PARGUAZA EN COLOMBIA PETROGRAPHY, GEOCHEMISTRY AND GEOCHRONOLOGY OF PARGUAZA GRANITE IN COLOMBIA
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).The major minerals are quartz, …
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 ...
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Translation of "el granito" into Spanish . Sample translated sentence: 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. ↔ El Granito de Parguaza aflora en el departamento de Vichada-(Colombia), hacia la …
Rocks of the Guiana shield are exposed in eastern Amazonia and eastern Llanos in Colombia, being progressively covered by younger sediments (Ordovician to …
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 ...
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 …
Fig. 5. A sketch of a four-stage tectonic model describing the geological history of the Parguaza intrusion: a) The pluton is emplaced as the result of the last stage of the Trans-Amazonian subduction. b) and c) After the Parguaza intrusion has cooled down NW-SE and E-W extension divided the pluton into fault-bounded blocks.
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, …
Los Pijiguaos represents a typical laterite bauxite deposit that formed on a flat topped plateau from weathering of the underlying mid-Proterozoic Rapakivi-type Parguaza granite. The complete laterite profile is characterized by a vertical zonation comprising a concretionary zone (the bauxite horizon), and a mottled zone (the saprolite horizon ...
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 …
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 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.
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 …
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 ...
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