Unknown
PANGAEA
In:
Supplement to: Honnorez, Jose J; von Herzen, Richard P; Barrett, T J; Borella, Peter E; Moorby, S A; Karato, Shun-ichiro; Shipboard Scientific Party (1983): Hydrothermal mounds and young ocean crust of the Galapagos: preliminary Deep Sea Drilling Results. In: Honnorez, J; Von Herzen, RP; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 70, 459-481, https://doi.org/10.2973/dsdp.proc.70.130.1983
Publication Date:
2023-06-27
Description:
A total of 32 holes at five sites near 1°N, 86°W drilled on Deep Sea Drilling Project (DSDP) Leg 70 (November- December 1979) provide unique data on the origin of the hydrothermal mounds on the southern flank of the Galapagos Spreading Center. Hydrothermal sediments, primarily Mn-oxide and nontronite, are restricted to the immediate vicinity of the mounds (〈 100 m) and are probably formed by the interaction of upward-percolating hydrothermal solutions with seawater and pelagic sediments above locally permeable zones of ocean crust. Mounds as high as 25 meters form in less than a few hundred thousand years, and geothermal and geochemical gradients indicate that they are actively forming today. The lack of alteration of upper basement rocks directly below the mounds and throughout the Galapagos region indicates that the source of the hydrothermal solutions is deeper in the crust.
Keywords:
70-506; 70-506B; 70-506C; 70-507A; 70-507D; 70-507F; 70-509B; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg70; North Pacific/MOUND
Type:
Dataset
Format:
application/zip, 2 datasets
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