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The recycling of subcontinental lithospheric mantle back into the asthenosphere during continental breakup is potentially a major but underappreciated process in plate tectonics. Here, we report major and trace elements for detrital peridotite minerals in carbonate breccias dredged from the Marion Rise, Southwest Indian Ridge. With an emphasis on the trace elements of the relatively abundant orthopyroxene...
Lower crusts of oceanic plateaus have been rarely studied and their nature remains unclear, due to low probability in preservation. Here we demonstrate that cumulates of the Pengco Complex in central Tibet represent the lower crust of an oceanic plateau generated at ~188 Ma. Mineral crystallization order and geochemistry support their formation via low‐P fractionation from anhydrous basaltic melts...
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