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  Evidence for the presence of metastable olivine within subducted oceanic lithosphere in the uppermost lower mantle beneath eastern United States

Kong, F., Gao, S. S., Liu, K., Fang, Y., Zhu, H., Stern, R. J., Li, J. (2023): Evidence for the presence of metastable olivine within subducted oceanic lithosphere in the uppermost lower mantle beneath eastern United States, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4721

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021129 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021129_1
Genre: Conference Paper

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 Creators:
Kong, Fansheng1, Author
Gao, Stephen S.1, Author
Liu, Kelly1, Author
Fang, Yinxia1, Author
Zhu, Hejun1, Author
Stern, Robert J.1, Author
Li, Jiabiao1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: Approximately two-thirds of Earth's outermost shell is composed of oceanic plates that form at spreading ridges and recycle back to Earth's interior in subduction zones. A series of physical and chemical changes occur in the subducting lithospheric slab as the temperature and pressure increase with depth. In particular, olivine, the most abundant mineral in the upper mantle, progressively transforms to its high-pressure polymorphs near the mantle transition zone, which is bounded by the 410 km and 660 km discontinuities. However, whether olivine still exists in the core of slabs once they penetrate the 660 km discontinuity remains debated. Based on SKS and SKKS shear-wave differential splitting times, we report new evidence that reveals the presence of metastable olivine in the uppermost lower mantle within the ancient Farallon plate beneath the eastern United States. Such differential splitting times were attributed to anisotropy in the D” layer. Spatial coherency analysis and consistency between the area with differential splitting times and that with higher than normal seismic velocities favor an uppermost lower mantle origin of the differential times. We estimate that the low-density olivine layer in the subducted Farallon slab may compensate the high density of the rest of the slab associated with the low temperature, leading to neutral buoyancy and preventing further sinking of the slab into the deeper part of the lower mantle.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-4721
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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