Composition and provenance of the Puente Formation (Miocene), Los Angeles Basin

Conference · Fri Apr 01 04:00:00 EST 1994 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:6943615

Critelli, S ^[1]; Rumelhart, P E; Ingersoll, R V ^[2]

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1. Instituto de Rierca per la Protezione Idrogeologica Nell'Italia Meridionale ed Insulare, Roges de Rende (Italy)
2. Univ. of California, Los Angeles, CA (United States)

The Puente Formation (PFm) is a middle to upper Miocene clastic unit lying unconformably on the middle to lower Miocene El Modeno Volcanics and Topanga Group, within the Los Angeles basin (LAB). The PFm, about 3900m thick, is composed of sandstone, conglomerate, and mudrock deposited on a submarine fan at bathyal depths. Several intrabasinal discordances suggest active tectonics during deposition. The succession consists of two main upward thickening and coarsening megacycles reflecting submarine fan progradation. The PFm is characterized up-section by: (1) thin-bedded fine sandstone and shale (La Vida M.) grading to thick-bedded coarse sandstone an conglomerate (soquel M.); (2) thin-bedded siltstone, mudrock and sandstone (Yorba M.) grading to thick- to very thick-bedded coarse-grained sandstone and conglomerate (Sycamore Canyon M.). Sandstones of the PFm are quartzofeldspathic and suggest a probable local provenance from the plutonic, volcanic, and metamorphic rocks of the San Gabriel Mountains. Petrological parameters, however, suggest variable contribution of these source rock units through time. Coarse-grained plutonic rock fragments are abundant for the entire succession and consist of plagioclase-rich plutonic rocks perhaps sourced from the Lowe granodiorite. Microlitic, lathwork to felsitic volcanic lithic grains are also present in the lower and middle part. In the Yorba M. there is a local increase of volcanic detritus (Lv/L - 0.80), represented by larger volcanic lithics and abundant volcaniclastic matrix. Metamorphic detritus is not very abundant; it is concentrated in the La Vida M. the PFm represents sedimentation during tectonically active time in the evolution of southern California.

• OSTI ID: 6943615
• Report Number(s): CONF-9404149--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Journal Volume: 78:4
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
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03 NATURAL GAS
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CALIFORNIA
DEPOSITION
DEVELOPED COUNTRIES
GEOLOGIC FORMATIONS
GEOLOGIC STRUCTURES
GEOLOGY
IGNEOUS ROCKS
LOS ANGELES
METAMORPHIC ROCKS
NORTH AMERICA
PETROGENESIS
PETROLOGY
PLUTONIC ROCKS
ROCKS
SANDSTONES
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
SHALES
SILTSTONES
SOURCE ROCKS
TECTONICS
URBAN AREAS
USA