GEOLOGY OF THE CHLORIDE QUADRANGLE, ARIZONA

Abstract

Research Article| April 01, 1953 GEOLOGY OF THE CHLORIDE QUADRANGLE, ARIZONA BLAKEMORE E THOMAS BLAKEMORE E THOMAS 12426½ VENTURA BOULEVARD, NORTH HOLLYWOOD, CALIFORNIA Search for other works by this author on: GSW Google Scholar GSA Bulletin (1953) 64 (4): 391–420. https://doi.org/10.1130/0016-7606(1953)64[391:GOTCQA]2.0.CO;2 Article history received: 17 Dec 1951 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation BLAKEMORE E THOMAS; GEOLOGY OF THE CHLORIDE QUADRANGLE, ARIZONA. GSA Bulletin 1953;; 64 (4): 391–420. doi: https://doi.org/10.1130/0016-7606(1953)64[391:GOTCQA]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 The Chloride quadrangle includes the southern two-thirds of the Cerbat Mountains, a range composed mostly of presumably Precambrian crystalline rocks. The oldest rocks are quartzite, mica schist, hornblende-diopside schist, and amphibolite. Younger and larger in amount are granite and granite gneiss. Gabbroic and dioritic gneiss, pegmatite, aplite, diabase, and mylonite also occur as part of the basement complex. The earliest rocks were strongly folded, but igneous intrusion and granitization have obliterated most of the folds. The rock types and the history of the basement complex compare closely with the Archean in the Grand Canyon.The area contains no Paleozoic rocks and probably no Mesozoic rocks. Intrusions of granite porphyry associated with mineralization are believed to be Tertiary. Dikes of granite porphyry, pegmatite, aplite, and lamprophyre are associated with these intrusions.Small areas of andesitic and rhyolitic extrusive rocks of Tertiary (?) age occur along the flanks of the range. Quaternary basalt caps these rocks in some places.Several periods of faulting and erosion are visible in the volcanic rocks. The latest faulting has produced the present mountains. The greatest displacement has been on the west side, and the Cerbat Range is an eastward-tilted fault block, modified in part into a horst. This mountain building seems to have occurred in late Tertiary and Quaternary time. Recent fault-block movement is suggested by the presence of canyon terraces and by the dissection of the pediment at the west base of the range. 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.