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Authors: | Taran, Y. A.* Inguaggiato, S.* Varley, N.* Capasso, G.* Favara, R.* |
Title: | Helium and carbon isotopes in thermal waters of the Jalisco block, Mexico | Journal: | Geofisica Internacional | Series/Report no.: | 4/41(2002) | Publisher: | Institute of Geophysics of the National Autonomous University of Mexico | Issue Date: | 2002 | URL: | http://serpiente.dgsca.unam.mx/serv_hem/revistas/fisica/ | Keywords: | Jalisco Block helium isotopes carbon isotopes water and gas geochemistry tectonics |
Subject Classification: | 04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry 04. Solid Earth::04.08. Volcanology::04.08.01. Gases 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring |
Abstract: | The Jalisco block is a geologically and tectonically complex part of western Mexico. It is considered a distinct crustal unit bounded toward the mainland by rifting and toward the Pacific ocean by the SW section of the Mid-America trench, a contact between the subducting Rivera plate and the continent. On the basis of chemical, helium, and carbon isotopic analyses of 37 groups of thermal springs widely distributed over the Jalisco block, several major tectonic environments can be distinguished. The highest R= 3He/4He ratios with R/Ra (Ra being the atmospheric 3He/4He ratio) approaching MORB values were observed along the Trans-Mexican Volcanic Belt (TMVB) and within the Colima volcanic complex. For springs in the inner part of the block and close to the Pacific coast, including submarine springs at Punta de Mita, typical values were much lower, with R/Ra down to 0.4. A negative correlation between 3He/4He and δ13C of CO2 is suggested to be the result of coupling between radiogenic He and CO2 formed by oxidation of organic-rich sediments. C/3He ratios vary from ~109 for TMVB, typical for volatiles released from the mantle, to > 1011 thus suggesting a substantial addition of carbon from the crust. |
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