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Cornucopia Stock, Wallowa Mountains, Northeastern Oregon: Field Relationships

1964; Geological Society of America; Volume: 75; Issue: 11 Linguagem: Inglês

10.1130/0016-7606(1964)75[1093

1943-2674

William H. Taubeneck,

Geochemistry and Geologic Mapping

Research Article| November 01, 1964 Cornucopia Stock, Wallowa Mountains, Northeastern Oregon: Field Relationships WILLIAM H TAUBENECK WILLIAM H TAUBENECK Dept. Geology, Oregon State University, Corvallis, Ore Search for other works by this author on: GSW Google Scholar Author and Article Information WILLIAM H TAUBENECK Dept. Geology, Oregon State University, Corvallis, Ore Publisher: Geological Society of America Received: 10 Dec 1963 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 (11): 1093–1116. https://doi.org/10.1130/0016-7606(1964)75[1093:CSWMNO]2.0.CO;2 Article history Received: 10 Dec 1963 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation WILLIAM H TAUBENECK; Cornucopia Stock, Wallowa Mountains, Northeastern Oregon: Field Relationships. GSA Bulletin 1964;; 75 (11): 1093–1116. doi: https://doi.org/10.1130/0016-7606(1964)75[1093:CSWMNO]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 composite Cornucopia stock, a satellite of the Wallowa batholith, intrudes a heterogeneous assortment of eugeosynclinal sediments and volcanic rocks of greenschist-facies regional metamorphism. Important field evidence for emplacement of magmas is furnished by contact relationships, wall-rock deformation, and structural features of the granitic rocks. The pluton contains at least five distinct granitic rocks. A related series of explosion breccias, intrusive breccias, and porphyry dikes forms part of the sequence.Willow Lake-type layered rocks are notable in a biotite trondhjemite unit but are more striking in parts of different intrusions of cordierite trondhjemite. Taubeneck and Poldervaart (1960) defined Willow Lake-type layered rocks as being composed of alternating bands of felsic and mafic constituents in which the minerals are characteristically elongated and oriented roughly perpendicular to the banding. Detailed mapping of Willow Lake-type layered rocks in Cornopia stock was instrumental in belated field recognition of the composite character of the trondhjemites. Elsewhere, Willow Lake-type layered rocks should also be useful in unraveling intrusive histories of some igneous complexes. 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.