Aeromagnetic Map with Geology of the Los Angeles 30 x 60 Minute Quadrangle, Southern California

Langenheim, V. E.; Hildenbrand, T. G.; Jachens, R. C.; Campbell, R. H.; Yerkes, R. F.

Abstract:

Introduction: An important objective of geologic mapping is to project surficial structures and stratigraphy into the subsurface. Geophysical data and analysis are useful tools for achieving this objective. This aeromagnetic anomaly map provides a three-dimensional perspective to the geologic mapping of the Los Angeles 30 by 60 minute quadrangle. Aeromagnetic maps show the distribution of magnetic rocks, primarily those containing magnetite (Blakely, 1995). In the Los Angeles quadrangle, the magnetic sources are Tertiary and Mesozoic igneous rocks and Precambrian crystalline rocks. Aeromagnetic anomalies mark abrupt spatial contrasts in magnetization that can be attributed to lithologic boundaries, perhaps caused by faulting of these rocks or by intrusive contacts. This aeromagnetic map overlain on geology, with information from wells and other geophysical data, provides constraints on the subsurface geology by allowing us to trace faults beneath surficial cover and estimate fault dip and offset. This map supersedes Langenheim and Jachens (1997) because of its digital form and the added value of overlaying the magnetic data on a geologic base. The geologic base for this map is from Yerkes and Campbell (2005); some of their subunits have been merged into one on this map.

Genre:

USGS Numbered Series

ProdID:

79253

Citation Author:

Langenheim, V. E.; Hildenbrand, T. G.; Jachens, R. C.; Campbell, R. H.; Yerkes, R. F.

Citation Contributing Office:

Geophysics Unit of Menlo Park

Citation Datum:

Citation Day:

Citation Edition:

Citation Editor:

Citation End Page:

Citation Issue:

Citation Keywords:

Citation Language:

ENGLISH

Citation Larger Work Title:

Citation LatN:

0343000

Citation LatS:

0340000

Citation LonE:

-1180000

Citation LonW:

-1190000

Citation Month:

Citation No Pagination:

Citation Number Of Pages:

Citation Online Only Flag:

Citation Phsyical Description:

oversized sheet, 61 inches by 33 inches

Citation Projection:

Citation Public Comments:

Citation Publisher:

Citation Series:

Scientific Investigations Map

Citation Series Code:

SIM

Citation Series Number:

2950

Citation Search Results Text:

Aeromagnetic Map with Geology of the Los Angeles 30 x 60 Minute Quadrangle, Southern California ; 2006; SIM; 2950; Langenheim, V. E.; Hildenbrand, T. G.; Jachens, R. C.; Campbell, R. H.; Yerkes, R. F.