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Ages and Nature of Volcanic Activity on the Southern High Plains, New Mexico and Colorado

1972; Geological Society of America; Volume: 83; Issue: 8 Linguagem: Inglês

10.1130/0016-7606(1972)83[2443

1943-2674

John C. Stormer,

Geology and Paleoclimatology Research

Research Article| August 01, 1972 Ages and Nature of Volcanic Activity on the Southern High Plains, New Mexico and Colorado J. C STORMER, JR J. C STORMER, JR Department of Geology, University of Georgia, Athens, Georgia 30601 Search for other works by this author on: GSW Google Scholar Author and Article Information J. C STORMER, JR Department of Geology, University of Georgia, Athens, Georgia 30601 Publisher: Geological Society of America Received: 27 Sep 1971 Revision Received: 06 Mar 1972 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1972, 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 (1972) 83 (8): 2443–2448. https://doi.org/10.1130/0016-7606(1972)83[2443:AANOVA]2.0.CO;2 Article history Received: 27 Sep 1971 Revision Received: 06 Mar 1972 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation J. C STORMER; Ages and Nature of Volcanic Activity on the Southern High Plains, New Mexico and Colorado. GSA Bulletin 1972;; 83 (8): 2443–2448. doi: https://doi.org/10.1130/0016-7606(1972)83[2443:AANOVA]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 intrusive rocks of the Spanish Peaks, south-central Colorado, range in age from 22 to 25 m.y., as shown by four K-Ar dates. These rocks as well as other intrusions in the Sangre de Cristo Range and southern high plains appear to be correlated in time with the early Miocene maximum of igneous activity in the Basin and Range province. The volcanic fields of northeastern New Mexico are products of a distinct 8-m.y.-to-Holocene phase of activity. Widespread olivine basalt 2 to 5 m.y. in age was erupted in these fields during approximately the same period that similar basalt was erupted west of the Sangre de Cristo Range in the Rio Grande depression. Feldspathoidal basanite and nephelinite were erupted about 1.9 m.y. ago in the Raton-Clayton field. The Capulin basalt flows are of Holocene age, and are characterized by the presence of resorbed plagioclase phenocrysts. These rocks resemble the Hinsdale basalt of a much earlier period that are located west of the Rio Grande depression. The relation of basalt magma type and position relative to the depression is complex, or asymmetric in time and space. 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.