Abstract
The depositional history of the southernmost region of the
trough-shaped
San Joaquin Basin spans from Upper Eocene to Recent time. The
stratigraphy
reveals both a predominantly marine environment which persisted
until the
Upper Pliocene, as well as nonmarine environments along the
basin's margins.
Folds and faults within the basin have resulted directly from
movements
along the San Andreas fault. Although the exact time of origin of
the Big
Bend is unclear, this major feature in the San Andreas fault's
geometry
has played an important role in recent crustal tectonics of
southern California.
Significantly, the southern San Joaquin's depocenter has undergone
an acceleration
in its rate of subsidence since late Pliocene time. Data on
partial loss
of radiogenic argon obtained from detrital microclines analyzed by
40Ar/
39Ar stepwise heating technique provides information on
temperatures experienced
at various stratigraphic levels in the basin. The results agree
with a
thermal history predicted for the basin's recent and present rapid
rate
of subsidence.
Be, K., 1983. Geological and thermal aspects of the southern San
Joaquin
Basin, California: application of the 40Ar/39Ar stepwise heating
technique
to detrital microclines. Unpublished MSc. thesis, State
University
of New York at Albany. 100pp., +vi
University at Albany Science Library call number: SCIENCE
Oversize
(*) QE 40 Z899 1983 B4
thesis (scanned
text) - 3.9MB pdf file
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