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Resumen del producto
Prol-Ledesma, R.M., M.A., Torres-Vera, R., Rodolfo-Metalpa, C., Ángeles, C.H., Lechuga Deveze, R.E., Villanueva-Estrada, E., Shumilin & C.J., Robinson
(2013).
High heat flow and ocean acidification at a nascent rift in the northern Gulf of California..
Nature Communications.
4: 1338-1445.
DOI: 10.1038/ncomms2390.
High heat flow and ocean acidification at a nascent rift in the northern Gulf of California.
Rosa Ma Prol-Ledesma, Marco-Antonio Torres-Vera, Riccardo Rodolfo-Metalpa, Catalina Ángeles, Carlos H. Lechuga Deveze, Ruth Esther Villanueva-Estrada, Evgueni Shumilin y Carlos Jorge Robinson
The prevailing tectonic setting in the Gulf California suggests the presence of an undetermined number of short spreading centres with associated hydrothermal systems. However, to date, active seafloor spreading phenomena have been documented in only three of the eight tectonically active basins. Here we report heat flow values as high as 15,436 mWm[1]2 in two of the northernmost basins of the Gulf of California, providing evidence of intense hydrothermal activity associated with the transition from continental rifting to seafloor spreading. The mean heat flow for the Wagner and Consag basins area is 1,875 mWm[1]2, more than 15 times higher than the mean value for oceanic crust (105.4mWm[1]2). Additional evidence for vigorous hydrothermal circulation and a shallow heat source includes intense gas discharge (CO2 and CH4), widespread low pH (average 7.7), locally high 222Rn concentrations in the bottom water and a high extent of organic matter maturation in the sediments.
Palabras clave: Heat flow; Wagner basin; Consag basin; Northern Gulf of Californi; acidification; Rn-222 anomaly
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