Conflicting tectonics? Contraction and extension at middle and upper crustal levels along the Cordilleran Late Jurassic arc, southeastern California
1994; Geological Society of America; Volume: 22; Issue: 3 Linguagem: Inglês
10.1130/0091-7613(1994)022 2.3.co;2
ISSN1943-2682
AutoresMark J. Davis, Daniel L. Farber, J. L. Wooden, J. Lawford Anderson,
Tópico(s)Geology and Paleoclimatology Research
ResumoResearch Article| March 01, 1994 Conflicting tectonics? Contraction and extension at middle and upper crustal levels along the Cordilleran Late Jurassic arc, southeastern California Mark J. Davis; Mark J. Davis 1Department of Geological Sciences, University of Southern California, Los Angeles, California 90089 Search for other works by this author on: GSW Google Scholar Daniel L. Farber; Daniel L. Farber 1Department of Geological Sciences, University of Southern California, Los Angeles, California 90089 Search for other works by this author on: GSW Google Scholar Joe L. Wooden; Joe L. Wooden 2U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar J. Lawford Anderson J. Lawford Anderson 1Department of Geological Sciences, University of Southern California, Los Angeles, California 90089 Search for other works by this author on: GSW Google Scholar Geology (1994) 22 (3): 247–250. https://doi.org/10.1130/0091-7613(1994)022 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 MailTo Tools Icon Tools Get Permissions Search Site Citation Mark J. Davis, Daniel L. Farber, Joe L. Wooden, J. Lawford Anderson; Conflicting tectonics? Contraction and extension at middle and upper crustal levels along the Cordilleran Late Jurassic arc, southeastern California. Geology 1994;; 22 (3): 247–250. doi: https://doi.org/10.1130/0091-7613(1994)022 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 Effects of mid-Mesozoic contraction followed closely in time by extension are present in mid- to upper-crustal plutonic rocks in the Chuckwalla Mountains of the eastern Transverse Ranges, California. Late Jurassic movement along a steeply dipping, right-lateral mylonitic shear zone is bracketed between 159 and 147 Ma via U-Pb dated plutons. Depth of emplacement vs. time data based on hornblende geobarometry and U-Pb geochronology of Mesozoic plutons indicate that a period of dramatic uplift affected the Chuckwalla Mountains during the Late Jurassic, contrasting sharply with data from the (then) nearby San Gabriel Mountains. Subsequent latest Jurassic extensional tectonics is suggested by alkalic plutonism, nearly synchronous intrusion of the Late Jurassic Independence dike swarm, and possibly by deposition of the McCoy Mountains Formation. We conclude that both contraction and extension were significant at upper- and mid-crustal depths in the Chuckwalla Mountains region during the Late Jurassic, and speculate that the combined influence of oblique convergence and the opening of the Gulf of Mexico may have caused the contrasting and nearly contemporaneous tectonic modes. 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.
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