The early Cenozoic tectonic history of the southeast Pacific

Details The early Cenozoic tectonic history of the southeast Pacific The early Cenozoic tectonic history of the southeast Pacific

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..57...63c&link_type=abstract

Earth and Planetary Science Letters, Volume 57, Issue 1, p. 63-74.

Physics

60

Scientific paper

New marine geophysical data collected in the southeast Pacific enable us to define better the early Cenozoic tectonic history of the area and to interpret previously unexplained bathymetric features in terms of plate tectonic processes. We have identified a major re-organization in plate boundaries at anomaly 21 time when a large fragment was broken off the Pacific plate and joined to the Antarctic plate. This interpretation is based on three pieces of evidence: (1) a major ESE-trending feature, the Humboldt Fracture Zone, marks the southern boundary of the Farallon-Antarctic anomalies identified by Weissel et al. [1], (2) a north-south striking trough, the Hudson Trough, which represents the scar left by the Pacific-Antarctic Ridge when it rifted across old Pacific crust, (3) a sequence of north-south striking magnetic lineations south of the Humboldt Fracture Zone and east of the Hudson Trough is correlated to anomalies 27 to 22 and identified with Pacific-Aluk spreading.

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