Major disruption of D" beneath Alaska
Abstract
D'' represents one of the most dramatic thermal and compositional layers within our planet. In particular, global tomographic models display relatively fast patches at the base of the mantle along the circum-Pacific which are generally attributed to slab debris. Such distinct patches interact with the bridgmanite (Br) to post-bridgmanite (PBr) phase boundary to generate particularly strong heterogeneity at their edges. Most seismic observations for the D'' come from the lower mantle S wave triplication (Scd). Here, in this work, we exploit the USArray waveform data to examine one of these sharp transitions in structure beneath Alaska. From west to east beneath Alaska, we observed three different characteristics in D'': (1) the western region with a strong Scd, requiring a sharp δVs = 2.5% increase; (2) the middle region with no clear Scd phases, indicating a lack of D'' (or thin Br-PBr layer); and (3) the eastern region with strong Scd phase, requiring a gradient increase in δVs. To explain such strong lateral variation in the velocity structure, chemical variations must be involved. We suggest that the western region represents relatively normal mantle. In contrast, the eastern region is influenced by a relic slab that has subducted down to the lowermostmore »
- Authors:
-
- Univ. of Science and Technology of China, Hefei (China); National Geophysics Observatory at Mengcheng, Anhui (China)
- California Inst. of Technology (CalTech), Pasadena, CA (United States)
- Univ. of Southern California, Los Angeles, CA (United States)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Org.:
- USDOE; National Natural Science Foundation of China (NSFC); Ministry of Science and Technology of the People’s Republic of China (MOST); Fundamental Research Funds for the Central Universities (China); National Science Foundation (NSF)
- OSTI Identifier:
- 1324803
- Grant/Contract Number:
- 41574037; 2014CB845901; WK2080000078; EAR-345015; EAR-1161046
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Solid Earth
- Additional Journal Information:
- Journal Volume: 121; Journal Issue: 5; Journal ID: ISSN 2169-9313
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- ENGLISH
- Subject:
- 58 GEOSCIENCES; D; Alaska
Citation Formats
Sun, Daoyuan, Helmberger, Don, Miller, Meghan S., and Jackson, Jennifer M. Major disruption of D" beneath Alaska. United States: N. p., 2016.
Web. doi:10.1002/2015JB012534.
Sun, Daoyuan, Helmberger, Don, Miller, Meghan S., & Jackson, Jennifer M. Major disruption of D" beneath Alaska. United States. https://doi.org/10.1002/2015JB012534
Sun, Daoyuan, Helmberger, Don, Miller, Meghan S., and Jackson, Jennifer M. Thu .
"Major disruption of D" beneath Alaska". United States. https://doi.org/10.1002/2015JB012534. https://www.osti.gov/servlets/purl/1324803.
@article{osti_1324803,
title = {Major disruption of D" beneath Alaska},
author = {Sun, Daoyuan and Helmberger, Don and Miller, Meghan S. and Jackson, Jennifer M.},
abstractNote = {D'' represents one of the most dramatic thermal and compositional layers within our planet. In particular, global tomographic models display relatively fast patches at the base of the mantle along the circum-Pacific which are generally attributed to slab debris. Such distinct patches interact with the bridgmanite (Br) to post-bridgmanite (PBr) phase boundary to generate particularly strong heterogeneity at their edges. Most seismic observations for the D'' come from the lower mantle S wave triplication (Scd). Here, in this work, we exploit the USArray waveform data to examine one of these sharp transitions in structure beneath Alaska. From west to east beneath Alaska, we observed three different characteristics in D'': (1) the western region with a strong Scd, requiring a sharp δVs = 2.5% increase; (2) the middle region with no clear Scd phases, indicating a lack of D'' (or thin Br-PBr layer); and (3) the eastern region with strong Scd phase, requiring a gradient increase in δVs. To explain such strong lateral variation in the velocity structure, chemical variations must be involved. We suggest that the western region represents relatively normal mantle. In contrast, the eastern region is influenced by a relic slab that has subducted down to the lowermost mantle. In the middle region, we infer an upwelling structure that disrupts the Br-PBr phase boundary. Such an interpretation is based upon a distinct pattern of travel time delays, waveform distortions, and amplitude patterns that reveal a circular-shaped anomaly about 5° across which can be modeled synthetically as a plume-like structure rising about 400 km high with a shear velocity reduction of ~5%, similar to geodynamic modeling predictions of upwellings.},
doi = {10.1002/2015JB012534},
journal = {Journal of Geophysical Research. Solid Earth},
number = 5,
volume = 121,
place = {United States},
year = {Thu May 12 00:00:00 EDT 2016},
month = {Thu May 12 00:00:00 EDT 2016}
}
Web of Science
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