Mantle transition zone beneath the Caribbean-South American plate boundary and its tectonic implications

Details Mantle transition zone beneath the Caribbean-South American plate boundary and its tectonic implications Mantle transition zone beneath the Caribbean-South American plate boundary and its tectonic implications

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010e%26psl.289..105h&link_type=abstract

Earth and Planetary Science Letters, Volume 289, Issue 1-2, p. 105-111.

Physics

3

Scientific paper

We analyzed receiver-function data recorded by a temporary broadband array deployed as part of the BOLIVAR project and the permanent seismic network of Venezuela to study the mantle transition zone structure beneath the Caribbean-South American plate boundary and Venezuela. Significant topography on both the 410-km and the 660-km discontinuities was clearly imaged in the CCP (common-conversion-point) stacked images. Beneath the southeastern Caribbean, the 410-km is featured by a narrow (˜ 200 km EW) ˜ 25-km uplift extending in the NS direction around 63° west, while the 660-km is depressed by ˜ 20 km in a narrow region slightly west to the uplift, a scenario that is more consistent with westward descent of the oceanic South American plate rather than a break-off of NNW dipping proto-Caribbean oceanic lithosphere along the El Pilar Fault. We also found a thick transition zone beneath the Falcon region in northwestern Venezuela, possibly associated with the subducted Nazca plate. A flat 410-km was observed beneath the Guayana shield, suggesting that the shield has a stable and moderately deep keel, which has little effect on the underlying transition zone structure.

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