Paleomagnetism of Plio-Quaternary basalts in the Jalisco block, western Mexico
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| Format: | Artículo científico |
| Language: | en |
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Universidad Nacional Autónoma de México
1997
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| _version_ | 1876486585692717056 |
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| author | J. Ortega Ramírez |
| author_facet | J. Ortega Ramírez |
| contents | Paleomagnetism of Plio-Quaternary basalts in the Jalisco block, western Mexico J. Ortega Ramírez J. M. Maillol W. L. Bandy Ciencias de la Tierra Jalisco Block paleomagnetism The interior of the Jalisco block, western Mexico, is disrupted by several NW-SE to NESWoriented grabens and associated recent alkaline volcanics which are bounded byWNW oriented regional lineaments. The geometry of these features suggests deformationfrom a right-lateral shear couple, consistent with NW motion of the Jalisco block relativeto the North American plate. A paleomagnetic study was carried out in the Mascotagraben, the Talpa de Allende graben, and the San Sebastián volcanic field. Results from16 sites (D=354.6ø, I=33.3ø, k= 18.1, a95= 8.9ø) agree with the expected North Americadirections. Therefore, no significant recent regional displacement or rotations were found.However, the dispersion of paleomagnetic site means is greater than that expected fromsecular variation alone, suggesting that differential block rotations may have taken place.Volcanism within the Talpa de Allende graben and the southern part of the Mascotagraben is probably older than 0.78 Ma as evidenced by the discovery of four reverselymagnetized lava flows. 1997 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56836103 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.1 Vol.36 |
| format | Artículo científico |
| id | redalyc_56836103 |
| institution | Redalyc |
| language | en |
| publishDate | 1997 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Paleomagnetism of Plio-Quaternary basalts in the Jalisco block, western Mexico J. Ortega Ramírez Ciencias de la Tierra Jalisco Block paleomagnetism Paleomagnetism of Plio-Quaternary basalts in the Jalisco block, western Mexico J. Ortega Ramírez J. M. Maillol W. L. Bandy Ciencias de la Tierra Jalisco Block paleomagnetism The interior of the Jalisco block, western Mexico, is disrupted by several NW-SE to NESWoriented grabens and associated recent alkaline volcanics which are bounded byWNW oriented regional lineaments. The geometry of these features suggests deformationfrom a right-lateral shear couple, consistent with NW motion of the Jalisco block relativeto the North American plate. A paleomagnetic study was carried out in the Mascotagraben, the Talpa de Allende graben, and the San Sebastián volcanic field. Results from16 sites (D=354.6ø, I=33.3ø, k= 18.1, a95= 8.9ø) agree with the expected North Americadirections. Therefore, no significant recent regional displacement or rotations were found.However, the dispersion of paleomagnetic site means is greater than that expected fromsecular variation alone, suggesting that differential block rotations may have taken place.Volcanism within the Talpa de Allende graben and the southern part of the Mascotagraben is probably older than 0.78 Ma as evidenced by the discovery of four reverselymagnetized lava flows. 1997 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56836103 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.1 Vol.36 |
| title | Paleomagnetism of Plio-Quaternary basalts in the Jalisco block, western Mexico |
| topic | Ciencias de la Tierra Jalisco Block paleomagnetism |
| url | https://www.redalyc.org/articulo.oa?id=56836103 |