Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.v51b0556j&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #V51B-0556
Physics
8450 Planetary Volcanism (5480), 8121 Dynamics, Convection Currents And Mantle Plumes, 7207 Core And Mantle, 3640 Igneous Petrology, 1025 Composition Of The Mantle
Scientific paper
The Yellowstone hotspot has extensive and youthful caldera forming volcanism, very high heatflow and significant gravity and geoid field anomalies. It is considered as a notable example of a continental plume. The existence of a plume beneath Yellowstone has been questioned and debated. We present the results of a high resolution 3D teleseismic tomography study that images the upper mantle beneath Yellowstone down to ~800 km depth. Because the delaytime tomography usually suffers from poor near surface resolution, the inversion is constrained by a priori information, including a large upper crustal low-velocity structure, the topography of the Moho, and the 410 and 660 km mantle discontinuities. Our derived model is consistent with various data sets and models for the Yellowstone region. In addition, long wave-length Bouguer gravity data is used as additional constraints, which are incorporated into the inversion via a joint inversion approach. Our modeling has resolved a region of low upper mantle velocity extending into, but not below, the transition zone. The results are discussed in terms of plumes and consistency with global models.
Jordan Michael
Smith Bill R.
Waite Gregory P.
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