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- W2314207397 abstract "Research Article| January 01, 2011 Petrogenesis of the McDermott Formation trachyandesite, San Juan basin, Colorado and New Mexico Daniel Wegert; Daniel Wegert ∗ 1Department of Geology, Baylor University, One Bear Place #97354, Waco, Texas 76798, U.S.A. ∗Correspondence should be addressed to: dwegert@mclennan.edu Search for other works by this author on: GSW Google Scholar Don F. Parker Don F. Parker 2Department of Geology, Baylor University, One Bear Place #97354, Waco, Texas 76798, U.S.A. Search for other works by this author on: GSW Google Scholar Rocky Mountain Geology (2011) 46 (2): 183–196. https://doi.org/10.2113/gsrocky.46.2.183 Article history received: 19 May 2009 rev-recd: 08 Apr 2011 accepted: 28 Jul 2011 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Daniel Wegert, Don F. Parker; Petrogenesis of the McDermott Formation trachyandesite, San Juan basin, Colorado and New Mexico. Rocky Mountain Geology 2011;; 46 (2): 183–196. doi: https://doi.org/10.2113/gsrocky.46.2.183 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search nav search search input Search input auto suggest search filter All ContentBy SocietyRocky Mountain Geology Search Advanced Search Abstract Lahar deposits within the Late Cretaceous McDermott Formation (Maastrichtian) contain abundant trachyandesite volcanic clasts with a narrow range of whole rock compositions. The outcrop pattern and thickness variations of the McDermott Formation suggest a source located in the general area of the present-day La Plata Mountains. Major and trace element trends indicate a possible petrogenetic relationship between the McDermott trachyandesite and La Plata Mountains intrusive rocks. Incompatible trace element compositions show subduction signatures in the trachyandesite and La Plata intrusive rocks, as well as in lower crustal xenoliths from the nearby Navajo volcanic field. Trace element patterns of Proterozoic units from the adjacent San Juan uplift rule out involvement of these upper crustal units in McDermott petrogenesis. Near zero ∊Ndt (−1.94 and 0.47) values rule out a Precambrian crustal source for these magmas as crustal values typically range from −6 to −18. Ba/La vs. Nb/La plots and ∊Ndt data suggest a subduction-modified continental lithospheric mantle source for these rocks. This lithospheric mantle may have acquired its orogenic trace-element signature during formation of the Proterozoic Yavapai terrane, which underlies the region. You do not currently have access to this article." @default.
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- W2314207397 title "Petrogenesis of the McDermott Formation trachyandesite, San Juan basin, Colorado and New Mexico" @default.
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