Geochemical characteristics of hydrothermal deposits and basalts at 49.6°E on the Southwest Indian Ridge

doi:10.3969/j.issn.1001-909X.2014.01.008

Abstract

Abstract: The geochemical characteristics of hydrothermal deposits and basalt samples taken from the ultraslow-spreading Southwest Indian Ridge at 49.6°E were analyzed by using XRF and ICP-MS. The results indicate: (1) the basalt samples in this area tend to be more alkaline comparing with the contents of the major elements of the N-type mid-ocean ridge basalts (N-MORB), and they are richer in Pb element than the N-MORB comparing with the contents of the trace element; (2) the analysis of major elements and trace elements of hydrothermal deposits indicates that the chosen samples are mostly Fe, Si, Mn-rich oxyhydroxide, and both of them are the hydrothermal origin; and (3) the contents of REE in the hydrothermal deposits are between those in basalt and seawater, the chondrite-normalized REE patterns of the hydrothermal deposits are characterized by positive Eu anomalies and LREE enrichments, and the geochemical indicators can not only simulate the distribution of element halos center on the hydrothermal vent on a small scale, but also reflect the influence area of the nearest hydrothermal activity.

Key words: Southwest Indian Ridge, basalt, hydrothermal deposits, geochemical halos

CLC Number:

P736.3

WANG Zhen-bo, WU Guang-hai , HAN Chen-hua. Geochemical characteristics of hydrothermal deposits and basalts at 49.6°E on the Southwest Indian Ridge[J]. Journal of Marine Sciences, 2014, 32(1): 64-73.

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