Middle Cenozoic depositional, tectonic, and sea level history of southern San Joaquin basin, California

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Abstract

The Eocene to lower Miocene fill of the southern San Joaquin basin contains three complete depositional sequences. The Tejon sequences (lower to middle Eocene) is marine and incorporates nearshore, shelf, slope, and basinal deposits. The San Emigdio (upper Eocene and lower Oligocene) and Pleito (Upper Oligocene) sequences intertongue eastward with alluvial-fan deposits of the Tecuya Formation. The lower part of the San Emigdio sequence was deposited by a westward-prograding Gilbert-type delta. The upper part of the San Emigdio sequence and lower part of the Pleito sequence were deposited by a system of shelf fan-deltas that prograded at least 10 km to the west. The middle and upper parts of the Pleito sequence were deposited by a slope fan-delta in relatively deep (hundreds of meters) water. Regional transgression during the early Eocene initiated deposition in the southern San Joaquin basin. The lower San Emigdio Gilbert-type delta prograded from the shelf edge during a lowstand in eustatic sea level at approximately 40 Ma. Relative highstand deposits in the San Emigdio and Pleito Formations consist of widespread progradational shallow-marine and nonmarine facies. The Eocene to early Miocene tectonic history of the southern San Joaquin basin included three distinct periods of increasingly intense activity. In general, local tectonic events, rather than eustatic sea level events, seem to have exerted the predominant control on middle Cenozoic sedimentation in the southern San Joaquin basin. -from Author

Original languageEnglish (US)
Pages (from-to)1297-1322
Number of pages26
JournalAAPG Bulletin
Volume72
Issue number11
StatePublished - 1988
Externally publishedYes

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Sea level
Tectonics
Fans
Eocene
Deposits
sea level
tectonics
history
Water meters
basin
fan delta
Oligocene
Sedimentation
Miocene
depositional sequence
lowstand
highstand
shelf break
alluvial fan
transgression

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Energy Engineering and Power Technology
  • Fuel Technology

Cite this

Middle Cenozoic depositional, tectonic, and sea level history of southern San Joaquin basin, California. / Decelles, Peter G.

In: AAPG Bulletin, Vol. 72, No. 11, 1988, p. 1297-1322.

Research output: Contribution to journalArticle

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