Structural geology and tectonic evolution of Los Angeles basin

Conference · Fri May 01 00:00:00 EDT 1987 · AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)

OSTI ID:5865534

Wright, T L

Oil in the Los Angeles basin has accumulated principally in anticlinal folds associated with strong Neogene faulting and compression. The still-continuing Pasadenan orogeny, involved northwest-trending right-lateral wrench faults related to the San Andreas system, has been the dominant influence. But that deformation has been overprinted on structures formed during two discrete earlier orogenic episodes: (1) the major widespread block faulting of the middle Miocene and (2) a less-obvious phase of compressive deformation that occurred during latest Miocene and earliest Pliocene time, involved left-lateral faulting - and related folding - on more westerly trends, and was especially significant along the northern margin of the basin. The resulting present-day structural pattern, therefore, is not a simple pattern of classical right-lateral wrench-fault deformation. It is a pattern which reflects the radical Neogene evolution of the regional stress field, and the interplay of wrench faulting with the hinge lines and strong sedimentary wedge belts formed by earlier vertical movements.

• Research Organization: Chevron, San Anselmo, CA
• OSTI ID: 5865534
• Report Number(s): CONF-870606-
• Journal Information: AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States), Vol. 71:5; Conference: American Association of Petroleum Geologists annual meeting, Los Angeles, CA, USA, 7 Jun 1987
• Country of Publication: United States
• Language: English

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