Paleozoic cratonal/miogeoclinal stratigraphy in the western Mojave Desert
- Univ. of Kansas, Lawrence (United States)
Detailed mapping of metasedimentary rocks by many workers in the western Mojave Desert, California, has revealed Paleozoic lithologies of cratonal/miogeoclinal affinity. These exposures are metamorphosed, highly strained, and dismembered, and sit as roof pendants to Mesozoic and Tertiary intrusive rocks. In most outcrops no diagnosis fossils are preserved. Age correlation of these units is based, therefore, solely on similarities to lithologic packages outside the region. Despite the complex tectonic history this area has suffered since the late Paleozoic paleogeographic elements trend southwest into the region from where they are last clearly defined near the California-Nevada border. Dolomitic and calcitic marbles, quartzites, and biotite schists make up a major part of the stratigraphy in many areas. The stratigraphy and lithology of these units strongly suggest that they are correlative with late Precambrian-Cambrian units in the Death Valley region. Possible Ordovician and Devonian marbles also are present within some sections; at least one locality contains stromatoporoids of probable Devonian age. Calcite marbles tentatively correlated with lithologically similar Permian units in the Death Valley area are also represented and appear to be depositionally overlain by Mesozoic( ) shallow-marine and are-derived clastic rocks. Although the western Mojave Desert region has experienced compressional, transcurrent, and extensional deformation since late Paleozoic, our current understanding and restoration of this deformation history does not significantly alter the general southwest Paleozoic paleogeographic trends known to exist farther east.
- OSTI ID:
- 5211225
- Report Number(s):
- CONF-9103128--
- Journal Information:
- AAPG Bulletin (American Association of Petroleum Geologists); (United States), Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Vol. 75:2; ISSN AABUD; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
580000* -- Geosciences
AGE ESTIMATION
ARID LANDS
CALIFORNIA
CARBONATE MINERALS
CARBONATE ROCKS
CORRELATIONS
DEPOSITION
DESERTS
DEVELOPED COUNTRIES
DOLOMITE
GEOLOGIC AGES
GEOLOGIC HISTORY
GEOLOGY
IGNEOUS ROCKS
LIMESTONE
LITHOLOGY
MAPPING
METAMORPHIC ROCKS
MINERALS
NORTH AMERICA
PALEOZOIC ERA
PETROGENESIS
PLUTONIC ROCKS
ROCKS
SEDIMENTARY ROCKS
STRATIGRAPHY
USA