PALEOMAGNETIC CONSTRAINTS ON THE INITIATION OF UPLIFT ON THE SANTA-SUSANA FAULT, WESTERN TRANSVERSE RANGES, CALIFORNIA

Authors
Citation
S. Levi et Rs. Yeats, PALEOMAGNETIC CONSTRAINTS ON THE INITIATION OF UPLIFT ON THE SANTA-SUSANA FAULT, WESTERN TRANSVERSE RANGES, CALIFORNIA, Tectonics, 12(3), 1993, pp. 688-702
Citations number
27
Categorie Soggetti
Geosciences, Interdisciplinary
Journal title
ISSN journal
02787407
Volume
12
Issue
3
Year of publication
1993
Pages
688 - 702
Database
ISI
SICI code
0278-7407(1993)12:3<688:PCOTIO>2.0.ZU;2-C
Abstract
The Plio-Pleistocene nonmarine Saugus Formation is widely exposed in t he east Ventura basin and the northern San Fernando Valley, north and south of the Santa Susana fault. In the east Ventura basin, the Saugus is overlain by the Pacoima Formation. Magnetostratigraphy of the fine -grained Saugus and Pacoima strata and the presence of the 0.76 Ma Bis hop ash are used to calculate their average sedimentation rates: 0.9 k m/m.y. in the east Ventura basin and 1.1 km/m.y. in the northern San F ernando Valley. Extrapolation of the Saugus and Pacoima sedimentation rates shows that they were deposited from about 2.3 to 0.5 Ma both nor th and south of the Santa Susana fault. The shift from remote to local ly derived clasts marks the initiation of uplift of the Santa Susana M ountains. The extrapolated age of this boundary is about 0.7-0.6 Ma.