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PRE-TERTIARY OROGENIC AND PLUTONIC INTRUSIVE ACTIVITY IN CENTRAL AND NORTHEASTERN OREGON

1964; Geological Society of America; Volume: 75; Issue: 12 Linguagem: Inglês

10.1130/0016-7606(1964)75[1255

1943-2674

T. P. Thayer, Callan Brown,

Geological and Geochemical Analysis

Research Article| December 01, 1964 PRE-TERTIARY OROGENIC AND PLUTONIC INTRUSIVE ACTIVITY IN CENTRAL AND NORTHEASTERN OREGON T. P THAYER; T. P THAYER U. S. GEOLOGICAL SURVEY, WASHINGTON, D. C. Search for other works by this author on: GSW Google Scholar C. E BROWN C. E BROWN U. S. GEOLOGICAL SURVEY, WASHINGTON, D. C. Search for other works by this author on: GSW Google Scholar Author and Article Information T. P THAYER U. S. GEOLOGICAL SURVEY, WASHINGTON, D. C. C. E BROWN U. S. GEOLOGICAL SURVEY, WASHINGTON, D. C. Publisher: Geological Society of America Received: 22 May 1964 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1964, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1964) 75 (12): 1255–1261. https://doi.org/10.1130/0016-7606(1964)75[1255:POAPIA]2.0.CO;2 Article history Received: 22 May 1964 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 T. P THAYER, C. E BROWN; PRE-TERTIARY OROGENIC AND PLUTONIC INTRUSIVE ACTIVITY IN CENTRAL AND NORTHEASTERN OREGON. GSA Bulletin 1964;; 75 (12): 1255–1261. doi: https://doi.org/10.1130/0016-7606(1964)75[1255:POAPIA]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 Pre-Tertiary rocks of the Blue Mountain region of central and northeastern Oregon comprise three major sedimentary and volcanic sequences and two distinct intrusive magma series. The ages of the sedimentary-volcanic sequences are Paleozoic, Late Triassic–Late Jurassic, and middle Cretaceous (Albian to Cenomanian), respectively. The earlier intrusive magma series ranges in composition from peridotite to albite granite and was emplaced during the major orogeny in the Blue Mountain region between earlier Permian and Late Triassic time. The later intrusive magma series is related to the Idaho batholith proper, ranges from gabbro to granodiorite, and probably was emplaced during the earlier half of Cretaceous time. The emplacement of a major intrusive magma series during Permian and Triassic time suggests a much closer relationship to the northern part of the Cordillera, in Canada and Alaska, than to the southern part in southwestern Oregon and California. 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.