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| Format: | Artículo científico |
| Langue: | en |
| Publié: |
Universidad Nacional Autónoma de México
1999
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| Accès en ligne: | https://www.redalyc.org/articulo.oa?id=56838103 |
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- Age constraints on host rocks of Los Uvares gold deposit: Magmatic pulses in southernmost Baja California, Mexico A. Carrillo Chávez M. Zentilli A. Griest H. Huyck Ciencias de la Tierra Mexico fission Ar ages track ages Cabo San Lucas block Los Uvares disseminated gold epithermal deposit, in the central part of the Cabo San Lucas Block (CSLB) near the tip ofBaja California peninsula, occurs in a cataclastically deformed tonalite intruded by alaskite and mildly faulted diorite dikes.Potassium-argon (K-Ar) isotopic ages on hornblende separates from relatively unaltered intrusive rocks at Los Uvares are: 137 ±6 Ma (tonalite) and 128 ± 5 Ma (diorite). The K-Ar ages are internally consistent with the relative ages of diorite and tonalite fromfield relationships, suggesting a Cretaceous magmatic event. These ages are older than previous ages found for similar plutonicrocks in the CSLB (ranges of 109-42 Ma). It seems likely that the Los Uvares deposit occurs in an intrusive complex that representsan older phase (not previously reported) of the Cretaceous-Tertiary magmatic pulse in the CSLB. Fission-track ages onapatites in the diorite dikes range from 80 to 100 Ma. Fission-track data suggest that hydrothermal activity at Los Uvares endedby ~80 Ma, and that cooling/erosion followed. 1999 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56838103 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.1 Vol.38