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Geology and geochronology of Grenville-age rocks in the Van Horn and Franklin Mountains area, west Texas: Implications for the tectonic evolution of Laurentia during the Grenville

2000; Geological Society of America; Volume: 112; Issue: 7 Linguagem: Inglês

10.1130/0016-7606(2000)112 2.3.co;2

1943-2674

M.E. Bickford, Kristian Soegaard, Kent C. Nielsen, J. M. McLelland,

Geology and Paleoclimatology Research

Research Article| July 01, 2000 Geology and geochronology of Grenville-age rocks in the Van Horn and Franklin Mountains area, west Texas: Implications for the tectonic evolution of Laurentia during the Grenville M.E. Bickford; M.E. Bickford 1Department of Earth Sciences, Heroy Geology Laboratory, Syracuse University, Syracuse, New York 13244-1070, USA Search for other works by this author on: GSW Google Scholar Kristian Soegaard; Kristian Soegaard 2Program in Geosciences, University of Texas at Dallas, Richardson, Texas 75083, USA Search for other works by this author on: GSW Google Scholar Kent C. Nielsen; Kent C. Nielsen 2Program in Geosciences, University of Texas at Dallas, Richardson, Texas 75083, USA Search for other works by this author on: GSW Google Scholar Jonathan M. McLelland Jonathan M. McLelland 1Department of Earth Sciences, Heroy Geology Laboratory, Syracuse University, Syracuse, New York 13244-1070, USA Search for other works by this author on: GSW Google Scholar Author and Article Information M.E. Bickford 1Department of Earth Sciences, Heroy Geology Laboratory, Syracuse University, Syracuse, New York 13244-1070, USA Kristian Soegaard 2Program in Geosciences, University of Texas at Dallas, Richardson, Texas 75083, USA Kent C. Nielsen 2Program in Geosciences, University of Texas at Dallas, Richardson, Texas 75083, USA Jonathan M. McLelland 1Department of Earth Sciences, Heroy Geology Laboratory, Syracuse University, Syracuse, New York 13244-1070, USA Publisher: Geological Society of America Received: 22 Apr 1999 Revision Received: 06 Oct 1999 Accepted: 01 Nov 1999 First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2000) 112 (7): 1134–1148. https://doi.org/10.1130/0016-7606(2000)112 2.0.CO;2 Article history Received: 22 Apr 1999 Revision Received: 06 Oct 1999 Accepted: 01 Nov 1999 First Online: 01 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 M.E. Bickford, Kristian Soegaard, Kent C. Nielsen, Jonathan M. McLelland; Geology and geochronology of Grenville-age rocks in the Van Horn and Franklin Mountains area, west Texas: Implications for the tectonic evolution of Laurentia during the Grenville. GSA Bulletin 2000;; 112 (7): 1134–1148. doi: https://doi.org/10.1130/0016-7606(2000)112 2.0.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 SocietyGSA Bulletin Search Advanced Search Abstract New U-Pb zircon and 40Ar/39Ar geochronological data for the Mesoproterozoic rocks at Van Horn, far west Texas, indicate that metarhyolite, quartzite, phyllite, and metabasalt of the Carrizo Mountain Group were formed ca. 1380–1330 Ma and are probably a southern part of the Southern Granite–Rhyolite province of W.R. Van Schmus and coworkers. These rocks were thrust over the ca. 1250 Ma carbonate-basalt-rhyolite sequence of the Allamoore and Tumbledown Formations and the younger Hazel Conglomerate (ca. 1035 Ma). The Castner Marble and Mundy Breccia of the Franklin Mountains near El Paso are coeval, and probably correlative, with the Allamoore-Tumbledown sequence. The ca. 1120 Ma granite and rhyolite boulders in the Hazel Formation are coeval with the Red Bluff Granite Suite and rhyolite of the Thunderbird Formation, both occurring in the Franklin Mountains, indicating that formation of granite and rhyolite was widespread in far west Texas at this time.Although these rocks are temporally related to the classic Grenvillian events of eastern North America and the Llano uplift of central Texas, they contrast starkly in their much lower (lowest greenschist) metamorphic grade and degree of deformation. It is likely that the Allamoore-Tumbledown-Castner-Mundy sequences, with their shallow-water sedimentary rocks and bimodal volcanic assemblages, accumulated ca. 1250 Ma in rift basins that formed on the southern margin of Laurentia during Grenville orogenesis. Renewed or continued extensional tectonism is implied by the presence of ca. 1120 Ma alkaline granitic and/or basaltic rocks in the Franklin Mountains, at Pajarito Mountain in New Mexico, in the Apache Group of southern Arizona, and in the Pahrump Group of the Death Valley region of southeastern California; all of these occurrences have been attributed to accumulation in rift basins. The striking alignment of these occurrences suggests that they were formed along a zone of transcurrent faulting that extended along the southern margin of Laurentia during Grenvillian (Mesoproterozoic) time. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.