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Evidence for a lithospheric step and pervasive lithospheric thinning beneath southern New England, Northeastern USA

Gillian B. Goldhagen, Heather A. Ford and Maureen D. Long
Evidence for a lithospheric step and pervasive lithospheric thinning beneath southern New England, Northeastern USA
Geology (Boulder) (June 2022) 50 (9): 1078-1082

Abstract

In this study, we use data from the SEISConn seismic experiment to calculate Sp receiver functions in order to characterize the geometry of upper-mantle structure beneath southern New England (northeastern United States). We image robust negative-velocity-gradient discontinuities beneath southern New England that we interpret as corresponding to the lithosphere-asthenosphere boundary (LAB) and identify a well-defined step of 15 km in LAB depth at a longitude of 73 degrees W, which we interpret to be the boundary between Laurentian and Appalachian lithosphere, although the offset may be larger if the putative LAB phase is reinterpreted to be a mid-lithospheric discontinuity. We infer that the lithosphere throughout the region is substantially thinner than elsewhere in the continental interior, consistent with regional tomographic studies and previously published Sp receiver function results. The presence of thinned lithosphere suggests that the low-velocity Northern Appalachian Anomaly (NAA) in the upper mantle may extend as far south as coastal Connecticut. The presence of regionally thinned lithosphere and a step in lithospheric thickness suggests that inherited structure may be preserved in present-day lithosphere, even in the presence of more recent dynamic processes associated with the NAA.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 50
Serial Issue: 9
Title: Evidence for a lithospheric step and pervasive lithospheric thinning beneath southern New England, Northeastern USA
Affiliation: University of California at Riverside, Department of Earth and Planetary Sciences, Riverside, CA, United States
Pages: 1078-1082
Published: 20220621
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 35
Accession Number: 2022-039487
Categories: Solid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: NSF grants EAR-1150722 and EAR-1800923
Illustration Description: sects., geol. sketch maps
N41°15'00" - N42°55'00", W73°30'00" - W69°55'00"
N40°30'00" - N45°00'00", W79°45'00" - W71°55'00"
N41°10'00" - N42°01'60", W71°55'00" - W71°07'00"
N40°58'60" - N42°02'60", W73°43'60" - W71°47'60"
Secondary Affiliation: Yale University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 202230
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