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Southern California Areal Mapping Project

 

Geologic Framework of the Santa Ana 30' x 60' Quadrangle

| Selected References |
Location of the Santa Ana 30' x 60' Quadrangle
Location of the Santa Ana 30' x 60' Quadrangle. Click to enlarge.

SCAMP continues to conduct geologic-mapping and geophysical investigations that are clarifying the geologic setting and geologic history of rock, sediment, and structures in the Santa Ana 30' x 60' quadrangle. The goal is to describe the physical properties of rock and sediment, to determine the distribution and movement history of fault systems, and to provide a geologic-map basis for evaluating geologic hazards and for investigating hydrogeologic resources. A preliminary digital geologic map of the Santa Ana quadrangle has been released along with preliminary isostatic gravity and residual magnetic maps.


The geologic map of the Santa Ana quadrangle synthesizes the geologic setting of diverse geologic materials, including pre-plutonic metasedimentary rocks, a host of Jurassic through Cretaceous plutonic rocks of the Peninsular Ranges batholith, Cretaceous through Pliocene marine and nonmarine sedimentary rocks of the Santa Ana Mountains, Puente Hills, and San Timoteo Badlands, and widespread Quaternary surficial materials. All of these materials are cut by active fault systems, including the San Jacinto, Elsinore, and Whittier faults. Thus, the Santa Ana quadrangle is a landmark achievement in archiving useful and digitally accessible geoscience information for a major urban area.

Areas of focus in the Santa Ana quadrangle include:

 

  • Mapping and analysis of surficial materials and bedrock within the San Jacinto fault zone between San Jacinto and Sunnymead (Lakeview and El Casco 7.5' quadrangles);
  • Mapping of geologic materials in the vicinity of the Elsinore Trough and Prado Flood Control Dam (Corona South and Corona North 7.5' quadrangles);
  • Mapping of surficial materials in the Santa Ana coastal plain;



Investigations like these will be used to revise and update the Santa Ana 30' x 60' quadrangle on a regular basis.

Recent SCAMP Products

Hillhouse, J. and Cox, B., 1997, Magnetic stratigraphy of boreholes 6M2MW7 and 6M36MW8 at March Air Force Base, California: U.S. Geological Survey Open-File Report 97-862, 64 p.

Jachens, R.C., and Dixon, E.T., 1991, Aeromagnetic map of the Santa Ana 1:100,000 quadrangle, California: U.S. Geological Survey Open-File Report 91-393, scale 1:100,000.

Jones, D.L. and Murchey, B.L., 1994, Provenance of the Bedford Canyon Formation, Santa Ana Mountains, California: Geological Society of America Abstracts with Program, v. 26, no. 2, p. 62.

Langenheim, V.E., Chapman, R.H., Sikora, R.F., Ponce, D.A., and Dixon, E.T., 1991, Isostatic residual gravity map of the Santa Ana 1:100,000-scale quadrangle, California: U.S. Geological Survey Open-File Report 91-555, scale 1:100,000.

Morton, D.M., 1999, compiler, Preliminary digital geologic map of the Santa Ana 30' x 60' quadrangle, Southern California, version 1.0: U.S. Geological Survey Open-File Report 99-172, scale 1:100,000.

Morton, D.M., and Cox, B.F., 1994, Geologic map of the Riverside East quadrangle, Riverside County, California: U.S. Geological Survey Open-File Report 88-754, scale 1:24,000.

Morton, D.M., and Kistler, R.W., 1997, SRI variation in the northern Peninsular Ranges batholith: Geological Society of America Abstracts with Programs, v. 29, no. 6, p.69.

Premo, W.R., Morton, D. M., Snee, L. W., Naeser, N.D., and Fanning, C.M., 1998, Isotopic Ages, Cooling Histories, and Magmatic Origins for Mesozoic Tonalitic Plutons from the N. Peninsular Ranges Batholith, S. California: Geological Society of America, Abstracts with Programs, v. 30, no. 5, p. 59.

Premo, W.R., Morton, D.M., Kistler, R.W., Snee, L.W., Lichte, F.E., and Naeser, N., 1994, Preliminary geochemical and isotopic results of a section across the northern Peninsular Ranges batholith: Geological Society of America Abstracts with Programs, v. 26, p. 82.

Premo, W.R., Morton, D.M., Snee, L.W., Naeser, N.D., and Fanning, C.M., 1998, Isotopic ages, cooling histories, and magmatic origins for Mesozoic tonalitic plutons from the northern Peninsular Ranges batholith, southern California: Geological Society of America Abstracts with Programs, v. 30, no. 5, p. 59.

Ridley, I.W., Lichte, F.R., Kistler, R.W. Berger, B., and Morton, D.M., 1994, Regional geochemical variations within the northern Peninsular and Transverse Ranges batholith provinces, southern California: Geological Society of America Abstracts with Programs, v. 26, p. 84.

Ridley, Ian, Lichte, Frederick E., Kistler, Ronald, and Morton, Douglas M., 1997, Trace element and isotope geochemistry of the Southern California batholith: new data for the northern Peninsular and Transverse Ranges: Geological Society of America Abstracts with Programs, v.29, no. 6. p. A-68-69.

Snee, L.W., Todd, V.R., Naeser, C.W., Naeser, N.D., and Morton, D.M., 1994, Preliminary 40Ar/39Ar and fission-track cooling ages of plutonic rocks across the Peninsular Ranges batholith, so. California: Geological Society of America Abstracts with Programs, v. 26, p. 94.

Todd, V.R., Erskine, B.G., and Morton, D.M., 1988, Metamorphic and tectonic evolution of the northern Peninsular Ranges batholith, southern California, in Ernst, W.G., ed., Metamorphism and crustal evolution of the western United States (Rubey Volume VII): Englewood Cliffs, Prentice-Hall, p. 894-937.

Wooden, J.L., Kistler, R.W., and Morton, D.M., 1997, RB-Sr WR ages and Sr, O, and Pb isotopic systematics of plutons in the northern Peninsular Ranges batholith southern California: Geological Society of America Abstracts with Programs, v. 29, no. 5, p. 74.

Wooden, J.L., Kistler, R.W., Fleck, R.J., Morton, D.M., and Barth, A.P., 1998, Pb and Sr isotopic and age constraints among the geologic terranes in southern California: a tool for understanding range uplift, basin development, and tectonic evolution: Geological Society of America Abstracts with Programs, v. 30, no. 5, p. 71.

Wooden, J.L., Kistler, R.W., Morton, D.M., and Lichte, F.E., 1994, A Pb, Sr, and O isotopic transect across the northern Peninsular Ranges batholith, southern California: EOS, Transactions of the American Geophysical Union, v. 75, p. 701.


Cooperative interactions



SCAMP geologic investigations in the Santa Ana 30' x 60' quadrangle are coordinated with several USGS projects, and with several external agencies. These cooperative investigations include:

Geologic framework for earthquake studies:



Earthquake investigations in southern California, including investigations of ground-shaking potential, earthquake monitoring, and earthquake history. The California Division of Mines and Geology has a program of earthquake-fault mapping and zonation designed to identify fault lines and to delineate setback guidelines. Geologic-mapping studies by SCAMP are coordinated with these earthquake investigations, and are designed to clarify the distribution, origin, and history of faulting within the Santa Ana 30' x 60' quadrangle.

Geologic framework for ground-water studies:



Ground-water issues in the Santa Ana 30' x 60' quadrangle are coordinated among several agencies, including:
  • U.S. Geological Survey, California District Office
  • U.S. Geological Survey, California District Office, Desert/Eastern Sierra Area Program (San Diego office)
  • California Department of Water Resources, Southern District
  • Metropolitan Water District
  • Water Quality Control Board, Santa Ana Region
  • Eastern Municipal Water District

SCAMP geologic-mapping and subsurface studies are coordinated with several investigations conducted by the USGS Water Resources Division California District Office, including:

  • Hydrogeologic investigations of the Santa Ana River watershed (Santa Ana NAWQA project);
  • Simulation Estimates of the Long-Term Water Budget near Hemet, California

| Selected References | Return to "Where is SCAMP Currently Working? |

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This site last updated September 3, 2004 (ps)

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