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• W2050381364 abstract "Research Article| January 01, 1991 Igneous petrogenesis of magnesian metavolcanic rocks from the central Klamath Mountains, northern California W. G. ERNST; W. G. ERNST 1Department of Geology, School of Earth Sciences, Stanford University, Stanford, California 94305-2115 Search for other works by this author on: GSW Google Scholar B. R. HACKER; B. R. HACKER 1Department of Geology, School of Earth Sciences, Stanford University, Stanford, California 94305-2115 Search for other works by this author on: GSW Google Scholar M. D. BARTON; M. D. BARTON 2Department of Earth and Space Sciences, University of California, Los Angeles, California 90024-1567 Search for other works by this author on: GSW Google Scholar GAUTAM SEN GAUTAM SEN 3Department of Geology, Florida International University, Miami, Florida 33199 Search for other works by this author on: GSW Google Scholar Author and Article Information W. G. ERNST 1Department of Geology, School of Earth Sciences, Stanford University, Stanford, California 94305-2115 B. R. HACKER 1Department of Geology, School of Earth Sciences, Stanford University, Stanford, California 94305-2115 M. D. BARTON 2Department of Earth and Space Sciences, University of California, Los Angeles, California 90024-1567 GAUTAM SEN 3Department of Geology, Florida International University, Miami, Florida 33199 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1991) 103 (1): 56–72. https://doi.org/10.1130/0016-7606(1991)103<0056:IPOMMR>2.3.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation W. G. ERNST, B. R. HACKER, M. D. BARTON, GAUTAM SEN; Igneous petrogenesis of magnesian metavolcanic rocks from the central Klamath Mountains, northern California. GSA Bulletin 1991;; 103 (1): 56–72. doi: https://doi.org/10.1130/0016-7606(1991)103<0056:IPOMMR>2.3.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 Mafic meta-igneous supracrustal rocks in the east-central part of the western Triassic and Paleozoic belt are interlayered with and appear to predominantly overlie fine-grained clastic and cherty metasedimentary strata. This complex constitutes a lithostratigraphic terrane exposed in the vicinity of Sawyers Bar, California. Basaltic flows, dikes, and sills are informally referred to as the Yellow Dog greenstones. Dark-colored, amygdaloidal flow breccias rich in titanium, iron, phosphorus, and light rare-earth elements (LREE's) constitute the lowest, mildly alkalic members of the mafic flow series, intimately interlayered with fine-grained terrigenous detritus. Element proportions suggest that the dark, Ti + Fe* + P-rich basaltic lavas may have been extruded in an oceanic intraplate setting. Interstratification with distal turbiditic strata indicates concurrent submarine volcanism and deep-sea sedimentary deposition. The main mass of the stratigraphically higher extrusive sequence is a light-colored, massive tholeiite series, poorer in Ti + Fe* + P + LREE's. Hypabyssal rocks belong exclusively to this second igneous suite. Compositions of the pale-colored, overlying basaltic/diabasic mass of the Yellow Dog greenstone section are consistent with eruption in an immature magmatic arc. Dikes presumably comagmatic with terminal-stage Yellow Dog volcanism cut the overlying, more eastern Stuart Fork terrane.The Yellow Dog greenstones contain relict magmatic clinopyroxene and/or pargasitic hornblende. Both melt series include Mg-rich units (ave17: MgO = 14.4 ± 1.9 wt. %; Cr = 650 ± 200 ppm; Ni = 270 ± 100 ppm). Sea-floor alteration apparently affected these mafic rocks in the marine environment following eruption, as reflected by δ18O, MgO, and CaO/Al2O3 values and by minor alkali and silica metasomatism. Yellow Dog igneous activity was extinguished during mid-Jurassic suturing of the oceanward Sawyers Bar terrane against and beneath the pre-existing landward Stuart Fork blueschist complex of Late Triassic metamorphic age. Subsequently, the terrane amalgam was invaded by Middle/ Late Jurassic granitoids. Minor chemical alteration, including 18O enrichment, also probably accompanied later regional, and especially contact, metamorphism. Nevertheless, many major-, minor-, and rare-earth-element variations in the Yellow Dog greenstones are compatible with igneous fractional crystallization trends but exclude the assimilation of significant amounts of sialic crust. 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." @default.
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• W2050381364 title "Igneous petrogenesis of magnesian metavolcanic rocks from the central Klamath Mountains, northern California" @default.
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