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Intrusion of basaltic sills into highly porous sediments, and resulting hydrothermal activity

Abstract

Sill intrusions into highly porous sediments in the Guaymas Basin, Gulf of California, lead to low-grade metamorphism, thermal alteration and migration of organic compounds, marked changes in interstitial water chemistry, and large-scale expulsion of heated pore fluids. The latter process creates space for the intruding magma and initiates a hydrothermal system, which can explain the observed hydrothermal deposits around fault scarps on the basin floor.

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Einsele, G., Gieskes, J., Curray, J. et al. Intrusion of basaltic sills into highly porous sediments, and resulting hydrothermal activity. Nature 283, 441–445 (1980). https://doi.org/10.1038/283441a0

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