Gravimetric modeling of the Parguaza granitic intrusion, Guyana Precambrian Shield, southwestern Venezuela using geochronological constraints
A combined gravimetric and geochronological interpretation of the Parguaza intrusion in the Guayana shield, southwestern Venezuela, indicates that there is a pattern of inverse cooling within this pluton. Based on a positive correlation between Rb/Sr whole rock apparent ages and residual Bouguer ano...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Universidad Nacional Autónoma de México, Instituto de Geofísica
2004-12-01
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| Series: | Geofísica Internacional |
| Subjects: | |
| Online Access: | http://www.geofisica.unam.mx/unid_apoyo/editorial/publicaciones/investigacion/geofisica_internacional/anteriores/2004/03/Jacome.pdf |
| _version_ | 1797723937142996992 |
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| author | Oscar Mirón-Valdespino Vincenzo Costanzo-Álvarez Carlos Izarra María I. Jácome |
| author_facet | Oscar Mirón-Valdespino Vincenzo Costanzo-Álvarez Carlos Izarra María I. Jácome |
| author_sort | Oscar Mirón-Valdespino |
| collection | DOAJ |
| description | A combined gravimetric and geochronological interpretation of the Parguaza intrusion in the Guayana shield, southwestern Venezuela, indicates that there is a pattern of inverse cooling within this pluton. Based on a positive correlation between Rb/Sr whole rock apparent ages and residual Bouguer anomaly, density contrasts over the Parguaza intrusion are linked to temperature and crystallization of mineral phases. This hypothesis is supported by density measurements on hand samples and by independent geochemical evidence. A simple 2D gravity model is constrained by surface geology, Rb/Sr apparent ages (whole rock) and residual Bouguer anomalies. Gravimetric modeling implies a model of horsts and grabens that accounts for inverse zoning of the intrusion as a result of geological and age contrasts across the faults. |
| first_indexed | 2024-03-12T10:10:01Z |
| format | Article |
| id | doaj.art-d53158289b734910bbc7cce145f8adf3 |
| institution | Directory Open Access Journal |
| issn | 0016-7169 |
| language | English |
| last_indexed | 2024-03-12T10:10:01Z |
| publishDate | 2004-12-01 |
| publisher | Universidad Nacional Autónoma de México, Instituto de Geofísica |
| record_format | Article |
| series | Geofísica Internacional |
| spelling | doaj.art-d53158289b734910bbc7cce145f8adf32023-09-02T10:57:20ZengUniversidad Nacional Autónoma de México, Instituto de GeofísicaGeofísica Internacional0016-71692004-12-01433383393Gravimetric modeling of the Parguaza granitic intrusion, Guyana Precambrian Shield, southwestern Venezuela using geochronological constraintsOscar Mirón-ValdespinoVincenzo Costanzo-ÁlvarezCarlos IzarraMaría I. JácomeA combined gravimetric and geochronological interpretation of the Parguaza intrusion in the Guayana shield, southwestern Venezuela, indicates that there is a pattern of inverse cooling within this pluton. Based on a positive correlation between Rb/Sr whole rock apparent ages and residual Bouguer anomaly, density contrasts over the Parguaza intrusion are linked to temperature and crystallization of mineral phases. This hypothesis is supported by density measurements on hand samples and by independent geochemical evidence. A simple 2D gravity model is constrained by surface geology, Rb/Sr apparent ages (whole rock) and residual Bouguer anomalies. Gravimetric modeling implies a model of horsts and grabens that accounts for inverse zoning of the intrusion as a result of geological and age contrasts across the faults.http://www.geofisica.unam.mx/unid_apoyo/editorial/publicaciones/investigacion/geofisica_internacional/anteriores/2004/03/Jacome.pdfRapakivi graniteresidual Bouguer anomalygravimetric modellingcooling patternapparent ages |
| spellingShingle | Oscar Mirón-Valdespino Vincenzo Costanzo-Álvarez Carlos Izarra María I. Jácome Gravimetric modeling of the Parguaza granitic intrusion, Guyana Precambrian Shield, southwestern Venezuela using geochronological constraints Geofísica Internacional Rapakivi granite residual Bouguer anomaly gravimetric modelling cooling pattern apparent ages |
| title | Gravimetric modeling of the Parguaza granitic intrusion, Guyana Precambrian Shield, southwestern Venezuela using geochronological constraints |
| title_full | Gravimetric modeling of the Parguaza granitic intrusion, Guyana Precambrian Shield, southwestern Venezuela using geochronological constraints |
| title_fullStr | Gravimetric modeling of the Parguaza granitic intrusion, Guyana Precambrian Shield, southwestern Venezuela using geochronological constraints |
| title_full_unstemmed | Gravimetric modeling of the Parguaza granitic intrusion, Guyana Precambrian Shield, southwestern Venezuela using geochronological constraints |
| title_short | Gravimetric modeling of the Parguaza granitic intrusion, Guyana Precambrian Shield, southwestern Venezuela using geochronological constraints |
| title_sort | gravimetric modeling of the parguaza granitic intrusion guyana precambrian shield southwestern venezuela using geochronological constraints |
| topic | Rapakivi granite residual Bouguer anomaly gravimetric modelling cooling pattern apparent ages |
| url | http://www.geofisica.unam.mx/unid_apoyo/editorial/publicaciones/investigacion/geofisica_internacional/anteriores/2004/03/Jacome.pdf |
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