Continental extension tectonics in the Gulf Extensional Province, northern Baja California, Mexico: evidence from low-temperature thermochronology

Andrew Gleadow; Barry Kohn; John Fletcher; Asaf Raza

doi:10.1071/ASEG2006ab050

ISSN: 2202-0586
E-ISSN:

oa Continental extension tectonics in the Gulf Extensional Province, northern Baja California, Mexico: evidence from low-temperature thermochronology
Authors Andrew Gleadow^a, Barry Kohn^b, John Fletcher^c and Asaf Raza^d
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^a School of Earth SciencesUniversity of Melbourne, Victoria, 3010, [email protected] ^b School of Earth SciencesUniversity of Melbourne, Victoria, 3010, [email protected] ^c Dept de GeohgiaCICESE, Ensenada, , BC, , Mexico, [email protected] ^d School of Earth SciencesUniversity of Melbourne, Victoria, 3010, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2006, Issue ASEG2006 - 18th Geophysical Conference, Dec 2006, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2006ab050
- Published online: 01 Dec 2006

Abstract

Low-temperature thermochronology on apatites from the Gulf Extensional Province in northern Baja California reveals fission-track ages >27 Ma in the Sierra San Pedro Martir and the Sierra Juarez. This indicates that exposed crustal depths are less than about 2km below the pre-extension land surface. Younger ages are found in the strongly rotated hanging wall blocks in the Sierra San Felipe towards the Gulf coast indicating deeper crustal levels. The more sensitive apatite (U-Th)/He system, however, reveals much younger ages along the foot of the main escarpment and in the San Felipe blocks constraining the time of onset of rapid extension to between 7 and 14 Ma.

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2006-12-01

2026-01-13

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References

Farley, K.A., 2002, (U-Th)/He dating: Techniques, calibrations and applications: Reviews in Mineralogy and Geochemistry. 47, 819–843.
Fletcher, J.M., Kohn, B.P., Gleadow, A.J.W., and Foster, D.A., 2000, Heterogeneous Neogene cooling and uplift of the Los Cabos block, southern Baja California: Evidence from fission track thermochronology: Geology, 28: 107-110.
Foster, D.A., and Gleadow, A.J.W., 1996, Structural framework and denudation history of the flanks of the Kenya and Anza Rifts, East Africa: Tectonics 15: 258-271.
Foster, D.A., Gleadow, A.J.W., Reynolds, S.J., and Fitzgerald, P.F., 1993, The denudation of metamorphic core complexes and the reconstruction of the Transition Zone, west central Arizona: constraints from apatite fission track thermochronology: Journal of Geophysical Research 98, 2167-2185.
Gleadow, A.J.W., Belton, D.X., Kohn, B.P. and Brown, R.W., 2002, Fission track dating of phosphate minerals and the thermochronology of apatite: Reviews in Mineralogy and Geochemistry 48, 579-630.
Stockli, D.F., 2005, Application of low-temperature thermo-chronometry to extensional tectonic settings: Reviews in Mineralogy and Geochemistry 58, 411-448.

/content/journals/10.1071/ASEG2006ab050

Article Type: Research Article

Keyword(s): (U-Th)/He; Continental Rifting; Fission-track; Gulf Extensional Province; thermochronology

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oa Continental extension tectonics in the Gulf Extensional Province, northern Baja California, Mexico: evidence from low-temperature thermochronology

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