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Archive · collection · 1992

Geochemistry of oceanic arc basement rocks of Sumisu Rift and Ohmachi Seamount

Listed in PANGAEA

Prehnite-pumpellyite facies metamorphism is described in the oceanic-arc basement rocks of Ocean Drilling Program Leg 126, Site 791 in the Sumisu Rift, western Pacific.

Description

Chemical variations of pumpellyite, epidote, chlorite, and prehnite are examined and paragenetic relations discussed. The metamorphism took place during the pre-rifting stage of an intraoceanic arc.

During the backarc rifting stage, the geothermal gradient of the area was not as high as that of a spreading mid-oceanic ridge.

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Catalogue records · 1

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Inferred from text
Geochemistry 70%
Provenance · 1 source records, 8 field assertions
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