Recent Volcanic Accretion at 9°N-10°N East Pacific Rise as Resolved by Combined Geochemical and Geological Observations
The ridge crest at 9°N-10°N East Pacific Rise (EPR) is dominated by overlapping lava flows that have overflowed the axial summit trough and flowed off-axis, forming a shingle-patterned terrain up to ~2-4 km on either side of the axial summit trough. In this study, we employ 230Th- 226Ra dating methods, in conjunction with geochemistry and seafloor geological observations, in an effort to discern the stratigraphic relationships between adjacent flows. We measured major and trace elements and 87Sr/86Sr, 143Nd/144Nd, 176Hf/177Hf, and 238U-230Th- 226Ra for lava glass samples collected from several ...
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