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Further evidence of fracture‐zone induced tectonic segmentation of the Antarctic Peninsula from detailed aeromagnetic anomalies
Author(s) -
Johnson A. C.,
Swain C. J.
Publication year - 1995
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 - 10.1029/95gl00812
Subject(s) - geology , magnetic anomaly , peninsula , lineament , batholith , tectonics , anomaly (physics) , fracture zone , margin (machine learning) , submarine pipeline , block (permutation group theory) , seismology , geophysics , oceanography , physics , geometry , mathematics , archaeology , condensed matter physics , machine learning , computer science , history
Aeromagnetic anomaly data collected between 67°S and 70°S crossing the Antarctic Peninsula and adjacent offshore areas show a prominent NW‐SE trend in the magnetic fabric. Apparent lateral offsets, previously recognized in the Pacific Margin Anomaly, have been mapped in detail and are shown to be much smaller than previously suggested. A 35 km wide zone of subdued magnetic anomalies at the Western edge of the Pacific Margin Anomaly, bounded by these apparent offsets, is interpreted as a downfaulted block of the mafic‐intermediate batholith thought to be responsible for the Pacific Margin Anomaly. The trends of both fracture zones and magnetic lineaments strongly support the link between faulting in the Antarctic Peninsula magmatic arc and offshore tectonics.