Tracing mantle components and the effect of subduction processes beneath the northern Antarctic Peninsula ...
Understanding subduction processes is critical in assessing the long-term evolution of the upper mantle and continental crust. We present new geochemical data on glassy submarine lavas from the Bransfield Strait, the Phoenix and West Scotia ridges, and previously unpublished data of marine sediments...
| Main Authors: | , , , , , , |
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| Format: | Dataset |
| Language: | English |
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Interdisciplinary Earth Data Alliance (IEDA)
2023
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.26022/ieda/112920 https://ecl.earthchem.org/view.php?id=2920 |
| Summary: | Understanding subduction processes is critical in assessing the long-term evolution of the upper mantle and continental crust. We present new geochemical data on glassy submarine lavas from the Bransfield Strait, the Phoenix and West Scotia ridges, and previously unpublished data of marine sediments from atop the Phoenix Plate. We combined new and published geochemical data from across the northern sector of the Antarctic Peninsula to unravel both large-scale mantle composition and flow across the region. The geochemistry of Phoenix and West Scotia Ridge basalts supports the hypothesis that both ridges are underlain by Pacific MORB mantle, brought into the region through the eastward expansion of the Scotia Plate. Our modeling suggests the presence of a more depleted Phoenix MORB mantle beneath the South Shetland Islands modified by the addition of 3 % subduction component with a fluid/sediment ratio ranging from 0.18 to 4. The increase in fluid/sediment ratios in the South Shetland Island lavas corresponds ... : Anderson, D. W., Saal, A. E., Lee, J. I., Mallick, S., Riley, T. R., Keller, R. A., & Haase, K. M. (2023). Tracing mantle components and the effect of subduction processes beneath the northern Antarctic Peninsula. Geochimica et Cosmochimica Acta, 343, 234–249. ... |
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