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Bibliographic Details
Main Author:	María I. Jácome
Format:	Artículo científico
Language:	en
Published:	Universidad Nacional Autónoma de México 2004
Subjects:	Ciencias de la Tierra apparent ages cooling pattern Rapakivi granite gravimetric modelling residual Bouguer anomaly
Online Access:	https://www.redalyc.org/articulo.oa?id=56843305
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Gravimetric modeling of the Parguaza granitic intrusion, Guyana Precambrian Shield, southwestern Venezuela using geochronological constraints María I. Jácome Carlos Izarra Vincenzo Costanzo Álvarez Oscar Mirón Valdespino Ciencias de la Tierra apparent ages cooling pattern Rapakivi granite gravimetric modelling residual Bouguer anomaly A combined gravimetric and geochronological interpretation of the Parguaza intrusion in the Guayana shield, southwesternVenezuela, indicates that there is a pattern of inverse cooling within this pluton. Based on a positive correlation between Rb/Srwhole rock apparent ages and residual Bouguer anomaly, density contrasts over the Parguaza intrusion are linked to temperatureand crystallization of mineral phases. This hypothesis is supported by density measurements on hand samples and by independentgeochemical evidence. A simple 2D gravity model is constrained by surface geology, Rb/Sr apparent ages (whole rock) andresidual Bouguer anomalies. Gravimetric modeling implies a model of horsts and grabens that accounts for inverse zoning of theintrusion as a result of geological and age contrasts across the faults. 2004 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56843305 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.3 Vol.43

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