Premium
Deep electrical conductivity structures of the Appalachian Orogen in the southeastern U.S.
Author(s) -
Ogawa Yasuo,
Jones Alan G.,
Unsworth Martyn J.,
Booker John R.,
Lu Xinyou,
Craven Jim,
Roberts Brian,
Parmelee Jennifer,
Farquharson Colin
Publication year - 1996
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/95gl03601
Subject(s) - geology , magnetotellurics , mantle (geology) , ridge , fibrous joint , seismology , geomorphology , geochemistry , paleontology , electrical resistivity and conductivity , medicine , electrical engineering , anatomy , engineering
Long period magnetotelluric data across the southeastern Appalachians image deep crustal and upper mantle relics of ancient orogenic events. Inversions of the responses show: (1) Beneath the Appalachian mountains there is a sub‐horizontal conductor at 15–20 km depth which dips to the southeast at the surface trace of the Brevard fault. (2) At the location of the Central Piedmont suture, there is a crustal conductor which dips towards the southeast, interpreted as a structure related to the Acadian suture. (3) Upper mantle conductors were found at 80 km depth northwest of the Blue Ridge and at 140 km depth southeast of the Eastern Piedmont. Between these, there is a northwest‐dipping resistive gap, possibly representing the remnant structure of the Alleghanian collision.