@article{0a15a9a2396a4349b388a9573a458d9a,
title = "Prominent thermal anomalies in the mantle transition zone beneath the Transantarctic Mountains",
abstract = "The Transantarctic Mountains (TAMs), Antarctica, exhibit anomalous uplift and volcanism and have been associated with regions of thermally perturbed upper mantle that may or may not be connected to lower mantle processes. To determine if the anomalous upper mantle beneath the TAMs connects to the lower mantle, we interrogate the mantle transition zone (MTZ) structure under the TAMs and adjacent parts of East Antarctica using 12,500+ detections of P-to-S conversions from the 410 and 660 km discontinuities. Our results show distinct zones of thinner-than-global-average MTZ (~205-225 km, ~10%-18% thinner) beneath the central TAMs and southern Victoria Land, revealing throughgoing convective thermal anomalies (i.e., mantle plumes) that connect prominent upper and lower mantle low-velocity regions. This suggests that the thermally perturbed upper mantle beneath the TAMs and Ross Island may have a lower mantle origin, which could influence patterns of volcanism and TAMs uplift.",
author = "Emry, {Erica L.} and Nyblade, {Andrew A.} and Alan Horton and Hansen, {Samantha E.} and Jordi Juli{\`a} and Aster, {Richard C.} and Huerta, {Audrey D.} and Winberry, {J. Paul} and Wiens, {Douglas A.} and Wilson, {Terry J.}",
note = "Funding Information: The authors acknowledge funding from the U.S. National Science Foundation (NSF) Office of Polar Programs and Earth Sciences (grants 0632230, 0632239, 0652322, 0632335, 0632136, 0632209, 0632185, 1349684, 1643798) and the Incorporated Research Institutions for Seismology (IRIS) Summer Internship Program. The seismic instruments were provided by IRIS through the Portable Array Seismic Studies of the Continental Lithosphere (PASSCAL) Instrument Center at The New Mexico Institute of Mining and Technology (Socorro, New Mexico, USA). Data collected are available through the IRIS Data Management Center (https:// www.iris.edu/hq). The facilities of the IRIS Consortium are supported by the NSF{\textquoteright}s Seismological Facilities for Funding Information: The authors acknowledge funding from the U.S. National Science Foundation (NSF) Office of Polar Programs and Earth Sciences (grants 0632230, 0632239, 0652322, 0632335, 0632136, 0632209, 0632185, 1349684, 1643798) and the Incorporated Research Institutions for Seismology (IRIS) Summer Internship Program. The seismic instruments were provided by IRIS through the Portable Array Seismic Studies of the Continental Lithosphere (PASSCAL) Instrument Center at The New Mexico Institute of Mining and Technology (Socorro, New Mexico, USA). Data collected are available through the IRIS Data Management Center (https:// www.iris.edu/hq). The facilities of the IRIS Consortium are supported by the NSF's Seismological Facilities for the Advancement of Geoscience (SAGE) Award under Cooperative Support Agreement EAR-1851048. We thank editor C. Clark, A. Reading, and two anonymous reviewers for their suggestions, as well as G. Brenn and A. Lloyd for providing their tomographic models. Other models can be accessed at https://ds.iris.edu/ds/products/ emc-gypsum/ or at http://www.seismolab.org/model/ antarctica/lithosphere/index.html#an1-crust. We also thank the IRIS PASSCAL staff and the researchers who maintain Antarctic seismometers. Publisher Copyright: {\textcopyright} 2020 Geological Society of America.",
year = "2020",
doi = "10.1130/G47346.1",
language = "English (US)",
volume = "48",
pages = "748--752",
journal = "Geology",
issn = "0091-7613",
publisher = "Geological Society of America",
number = "7",
}
