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Clockwise rotation of the western Mojave Desert

1988; Geological Society of America; Volume: 16; Issue: 2 Linguagem: Inglês

10.1130/0091-7613(1988)016 2.3.co;2

1943-2682

M. P. Golombek, Laurie L. Brown,

Geology and Paleoclimatology Research

Research Article| February 01, 1988 Clockwise rotation of the western Mojave Desert Matthew P. Golombek; Matthew P. Golombek 1Jet Propulsion Laboratory, Earth and Space Sciences Division, Mail Stop 183-501, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109 Search for other works by this author on: GSW Google Scholar Laurie L. Brown Laurie L. Brown 2Department of Geology and Geography, University of Massachusetts, Amherst, Massachusetts 01003 Search for other works by this author on: GSW Google Scholar Author and Article Information Matthew P. Golombek 1Jet Propulsion Laboratory, Earth and Space Sciences Division, Mail Stop 183-501, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109 Laurie L. Brown 2Department of Geology and Geography, University of Massachusetts, Amherst, Massachusetts 01003 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1988) 16 (2): 126–130. https://doi.org/10.1130/0091-7613(1988)016 2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Matthew P. Golombek, Laurie L. Brown; Clockwise rotation of the western Mojave Desert. Geology 1988;; 16 (2): 126–130. doi: https://doi.org/10.1130/0091-7613(1988)016 2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Paleomagnetic results from Miocene volcanic rocks in the western Mojave Desert suggest about 25° of clockwise rotation for this region. Twelve sites (110 oriented cores) were collected from the 20 Ma Saddleback Basalt and seven sites (56 oriented cores) from the Red Buttes Quartz Basalt around Boron, California. Structural corrections were made from the attitude of the basalt or the Tropico Group sedimentary rocks in which the sampled basalts are interbedded. Paleomagnetic directions are coincident for the two basalts and show both normal and reversed polarity. After demagnetization to 40 or 60 mT, application of structural corrections, and inversion of reversed sites, the data yield an average direction of I = 51.6° and D = 15.6°, k = 19,α95 = 8.2°. Comparison with the expected direction for Miocene rocks for stable North America shows a clockwise rotation of 23.8° ±11.3° and a flattening of 2.1° ±7.4°. Clockwise rotation of the western Mojave agrees in direction with oroclinal bending of the southern Sierra Nevada due to right-lateral shear along the western margin of North America. Most of this rotation is constrained by other paleomagnetic and structural information to have occurred soon after the sampled basalts were deposited (about 20 Ma) and before about 16 Ma. These clockwise declination anomalies also indicate that any subsequent counterclockwise rotation of the Mojave is small and/or compensated by previous clockwise rotation. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.