Date File Created Name of Creator 3/26/2009 Will Frazier GeoRef Data 2008-130075 DN GeoRef TI "Oxygen isotope geochemistry of the Lassen volcanic center, California;resolving crustal and mantle contributions to continental arcmagmatism" AU "Feeley, T C; Clynne, M A; Winer, G S; Grice, W C" AF "Montana State University, Department of Earth Sciences, Bozeman, MT,United States (USA)" AF "U. S. Geological Survey, United States (USA)" SP "USGSOP, Non-USGS publications with USGS authors" SO "Journal of Petrology, vol. 49, no. 5, pp.971-997, May 2008" EI 1460-2415 IS 0022-3530 CD JPTGAD PB "Oxford University Press, Oxford, United Kingdom (GBR)" DE andesitic composition; basaltic composition; California; continentalcrust; crust; geochemistry; igneous rocks; isotope ratios; isotopes;Lassen Volcanic Center; Lassen Volcanic National Park;lithogeochemistry; magmatism; mantle; O-18/O-16; oxygen; rhyoliticcomposition; stable isotopes; United States; volcanic rocks AB "This study reports oxygen isotope ratios determined by laserfluorination of mineral separates (mainly plagioclase) from basalticandesitic to rhyolitic composition volcanic rocks erupted from theLassen Volcanic Center (LVC), northern California. Plagioclaseseparates from nearly all rocks have delta (super 18) O values(6.1-8.4ppm) higher than expected for production of the magmas bypartial melting of little evolved basaltic lavas erupted in the arcfront and back-arc regions of the southernmost Cascades during thelate Cenozoic. Most LVC magmas must therefore contain high (super 18)O crustal material. In this regard, the delta (super 18) O values ofthe volcanic rocks show strong spatial patterns, particularly foryoung rhyodacitic rocks that best represent unmodified partial meltsof the continental crust. Rhyodacitic magmas erupted from ventslocated within 3.5 km of the inferred center of the LVC haveconsistently lower delta (super 18) O values (average 6.3ppm+ or-0.1ppm) at given SiO (sub 2) contents relative to rocks erupted fromdistal vents (>7.0 km; average 7.1ppm+ or -0.1ppm). Further, magmaserupted from vents situated at transitional distances haveintermediate values and span a larger range (average 6.8ppm+ or-0.2ppm). Basaltic andesitic to andesitic composition rocks showsimilar spatial variations, although as a group the delta (super 18) Ovalues of these rocks are more variable and extend to higher valuesthan the rhyodacitic rocks. These features are interpreted to reflectassimilation of heterogeneous lower continental crust by mafic magmas,followed by mixing or mingling with silicic magmas formed by partialmelting of initially high (super 18) O continental crust (approximately 9.0ppm) increasingly hybridized by lower delta (super18) O ( approximately 6.0ppm) mantle-derived basaltic magmas towardthe center of the system. Mixing calculations using estimatedendmember source delta (super 18) O values imply that LVC magmascontain on a molar oxygen basis approximately 42 to 4% isotopicallyheavy continental crust, with proportions declining in a broadlyregular fashion toward the center of the LVC. Conversely, the delta(super 18) O values of the rhyodacitic rocks suggest that thecontinental crust in the melt generation zones beneath the LVC hasbeen substantially modified by intrusion of mantle-derived basalticmagmas, with the degree of hybridization ranging on a molar oxygenbasis from approximately 60% at distances up to 12 km from the centerof the system to 97% directly beneath the focus region. These resultsdemonstrate on a relatively small scale the strong influence thatintrusion of mantle-derived mafic magmas can have on modifying thecomposition of pre-existing continental crust in regions of meltproduction. Given this result, similar, but larger-scale, regionaltrends in magma compositions may reflect an analogous but moreextensive process wherein the continental crust becomes progressivelyhybridized beneath frontal arc localities as a result of protractedintrusion of subduction-related basaltic magmas." LA English FE "References: 103; illus. incl. 1 table, geol. sketch maps" PY 2008 PT Serial; Analytic CP United Kingdom (GBR) LL "Latitude:N402500,N403500 Longitude:W1211700,W1213700" CL 02D Isotope geochemistry; 05A Igneous and metamorphic petrology CY "GeoRef, Copyright 2008, American Geological Institute." UD 200824 DO 10.1093/petrology/egn013 AN 2008-130075 JV 49 JI 5 JP 971-997 Sample Data Item Age Max_age Min_age LatDD LongDD Loc_prec 87_86Sr 87_86Sr SiO2 SiO2 Rock_Type Rock_Class Sample_Description Collected_by Material State Units Ma Ma Ma DD DD wt% wt% Method 1 1 1 2 2 3 4 5 6 Sample Name LF01-002 0.6 0.47 40.40644319 -121.514529 0.0001 55.44 Volcanic Basaltic Andesite Mill Canyon unit Bullen and Clynne Whole rock California LF01-003 0.6 0.47 40.4060055 -121.5134191 0.0001 57.38 Volcanic Andesite Mill Canyon unit Feeley and others Whole rock California LF01-004 0.6 0.47 40.41316377 -121.5117294 0.0001 0.70404 56.64 Volcanic Basaltic Andesite Mill Canyon unit Bullen and Clynne Whole rock California LF01-005 0.6 0.47 40.41310639 -121.5114714 0.0001 56.3 Volcanic Basaltic Andesite Mill Canyon unit Feeley and others Whole rock California LF01-006 0.6 0.47 40.41283609 -121.5107702 0.0001 56.68 Volcanic Basaltic Andesite Mill Canyon unit Bullen and Clynne Whole rock California LF01-007 0.6 0.47 40.41277153 -121.5106538 0.0001 53.4 Volcanic Basaltic Andesite Mill Canyon unit Feeley and others Whole rock California LF01-008 0.6 0.47 40.41294018 -121.5111569 0.0001 55.3 Volcanic Basaltic Andesite Mill Canyon unit Feeley and others Whole rock California LF01-009 0.6 0.47 40.41303184 -121.509882 0.0001 56.3 Volcanic Basaltic Andesite Mill Canyon unit Feeley and others Whole rock California LF01-010 0.6 0.47 40.41356008 -121.5082321 0.0001 59.87 Volcanic Andesite Mill Canyon unit Bullen and Clynne Whole rock California LF01-048 0.6 0.47 40.42602768 -121.5271354 0.0001 58 Volcanic Andesite Mill Canyon unit Feeley and others Whole rock California LF01-049 0.6 0.47 40.42633149 -121.5269402 0.0001 56.6 Volcanic Basaltic Andesite Mill Canyon unit Feeley and others Whole rock California LF01-050 0.6 0.47 40.4264741 -121.5275264 0.0001 58.1 Volcanic Andesite Mill Canyon unit Feeley and others Whole rock California LF01-051 0.6 0.47 40.42679968 -121.5276254 0.0001 58.3 Volcanic Andesite Mill Canyon unit Feeley and others Whole rock California LF01-052 0.6 0.47 40.4269645 -121.5285413 0.0001 59.4 Volcanic Andesite Mill Canyon unit Feeley and others Whole rock California LF01-024 0.6 0.47 40.43028132 -121.5202052 0.0001 58.3 Volcanic Andesite Mill Canyon unit Feeley and others Whole rock California LF01-017 0.6 0.47 40.46294061 -121.5748273 0.0001 64.6 Volcanic Dacite Bailey Creek unit Feeley and others Whole rock California LF01-018 0.6 0.47 40.46177776 -121.5747693 0.0001 61.2 Volcanic Andesite Bailey Creek unit Feeley and others Whole rock California LF01-019 0.6 0.47 40.45900874 -121.5766913 0.0001 59.4 Volcanic Andesite Bailey Creek unit Feeley and others Whole rock California LF01-020 0.6 0.47 40.45807337 -121.5760859 0.0001 54.2 Volcanic Basaltic Andesite Bailey Creek unit Feeley and others Whole rock California LF01-021 0.6 0.47 40.45591502 -121.5756598 0.0001 59.4 Volcanic Andesite Bailey Creek unit Feeley and others Whole rock California LF01-013 0.6 0.47 40.47772949 -121.5636379 0.0001 57.85 Volcanic Andesite Andesite of Blue Lake Canyon Bullen and Clynne Whole rock California LF01-012-1-A 0.6 0.47 40.47772949 -121.5636379 0.0001 Xenolith Andesite Crustal xenolith in andesite of Blue Lake Canyon Bullen and Clynne Whole rock California LF01-012-II-A 0.6 0.47 40.47772949 -121.5636379 0.0001 57.85 Xenolith Andesite Cumulate inclusion in andesite of Blue Lake Canyon Bullen and Clynne Whole rock California LF01-012-II-B 0.6 0.47 40.47772949 -121.5636379 0.0001 57.85 Xenolith Andesite Cumulate inclusion in andesite of Blue Lake Canyon Bullen and Clynne Whole rock California LF01-014 0.6 0.47 40.47764775 -121.5542022 0.0001 67.46 Volcanic Dacite Dacite of Twin Meadows Bullen and Clynne Whole rock California LM80-824 0.6 0.47 40.42119738 -121.4948739 0.0001 0.70418 60.22 Volcanic Dacite Mill Canyon unit Bullen and Clynne Whole rock California LM80-854 0.6 0.47 40.42337652 -121.4961808 0.0001 0.7037 60.1 Volcanic Andesite Mill Canyon unit Bullen and Clynne Whole rock California LC80-178 0.6 0.47 40.43345724 -121.5919195 0.0001 0.70415 60.34 Volcanic Andesite Mill Canyon unit Bullen and Clynne Whole rock California LC80-436B 0.6 0.47 40.40612258 -121.5134165 0.0001 0.70325 55.28 Volcanic Basaltic Andesite Mill Canyon unit Bullen and Clynne Whole rock California LC84-600 0.6 0.47 40.45437877 -121.4867632 0.0001 0.70416 67.98 Volcanic Dacite Mill Canyon unit Bullen and Clynne Whole rock California LF01-001 0.47 0.385 40.41418268 -121.5322141 0.0001 58.98 Volcanic Andesite Andesite of Bluff Falls quarry Bullen and Clynne Whole rock California LF01-011 0.47 0.385 40.40040108 -121.4760244 0.0001 0.7042 62.96 Volcanic Andesite Andesite of Rice Creek Bullen and Clynne Whole rock California LF01-015 0.47 0.385 40.48244609 -121.5625935 0.0001 0.70363 61.56 Volcanic Andesite Andesite of Mt. Diller Bullen and Clynne Whole rock California LF01-031 0.47 0.385 40.46534187 -121.5179734 0.0001 61.54 Volcanic Andesite Andesite of Mt. Diller Bullen and Clynne Whole rock California LF01-016 0.47 0.385 40.48597328 -121.5782572 0.0001 61.5 Volcanic Andesite Andesite of Digger Creek Bullen and Clynne Whole rock California LF01-022 0.47 0.385 40.4529442 -121.5780221 0.0001 0.70347 61.32 Volcanic Andesite Andesite of Digger Creek Bullen and Clynne Whole rock California LF01-023 0.47 0.385 40.43923638 -121.5586922 0.0001 61.71 Volcanic Andesite Andesite of Glassburner Meadows Bullen and Clynne Whole rock California LF02-062 0.065 40.52808182 -121.4849293 0.0001 0.70411 69.95 Volcanic Rhyodacite Lower pyroclastic flow; Chaos Crags Bullen and Clynne Whole rock California LF02-063 0.065 40.52804471 -121.4848475 0.0001 69.59 Volcanic Rhyodacite Middle pyroclastic flow; Chaos Crags Bullen and Clynne Whole rock California LF02-021 0.065 40.5154966 -121.5465669 0.0001 0.70403 69.42 Volcanic Rhyodacite Upper pyroclastic flow; Chaos Crags Bullen and Clynne Whole rock California LF02-029 0.065 40.51260503 -121.5147378 0.0001 0.70408 69.61 Volcanic Rhyodacite Chaos Crags dome A Bullen and Clynne Whole rock California LF02-028 0.065 40.51112146 -121.5121622 0.0001 Xenolith Rhyodacite Chaos Crags dome A inclusion phenocrysts Bullen and Clynne Whole rock California LF01-039 0.065 40.52476746 -121.5309847 0.0001 0.7041 69.81 Volcanic Rhyodacite Chaos Crags dome B Bullen and Clynne Whole rock California LF01-040iA 0.065 40.5247583 -121.530973 0.0001 Xenolith Basaltic Andesite Chaos Crags dome B inclusion phenocrysts Bullen and Clynne Whole rock California LF01-040iA 0.065 40.5247583 -121.530973 0.0001 55.59 Xenolith Basaltic Andesite Chaos Crags dome B inclusion microlites Feeley and others Whole rock California LF01-040iB 0.065 40.5247583 -121.530973 0.0001 54.49 Xenolith Basaltic Andesite Chaos Crags dome B inclusion microlites Feeley and others Whole rock California LF01-041 0.065 40.52921497 -121.5293528 0.0001 0.70399 68.88 Volcanic Rhyodacite Chaos Crags dome C Bullen and Clynne Whole rock California LF01-042 0.065 40.52920596 -121.529353 0.0001 54.84 Xenolith Basaltic Andesite Chaos Crags dome C inclusion microlites Feeley and others Whole rock California LF01-037 0.065 40.52870177 -121.5350426 0.0001 0.704 67.78 Volcanic Dacite Chaos Crags dome D Bullen and Clynne Whole rock California LF01-038iA 0.065 40.52869231 -121.5350073 0.0001 56.08 Xenoloith Basaltic Andesite Chaos Crags dome D inclusion microlites Feeley and others Whole rock California LF01-043 0.065 40.53539711 -121.5203624 0.0001 0.70398 66.97 Volcanic Dacite Chaos Crags dome E Bullen and Clynne Whole rock California LF01-044iA 0.065 40.53540627 -121.520374 0.0001 Xenolith Basaltic Andesite Chaos Crags dome E inclusion phenocrysts Bullen and Clynne Whole rock California LF01-044iA 0.065 40.53540627 -121.520374 0.0001 54.8 Xenolith Basaltic Andesite Chaos Crags dome E inclusion microlites Feeley and others Whole rock California LF01-044iB 0.065 40.53540627 -121.520374 0.0001 57.54 Xenolith Andesite Chaos Crags dome E inclusion microlites Feeley and others Whole rock California LF01-045 0.065 40.53497844 -121.5116227 0.0001 0.704 68.17 Volcanic Rhyodacite Chaos Crags dome F Bullen and Clynne Whole rock California LF02-043 0.065 40.4936178 -122.487227 0.0001 65.25 Volcanic Dacite Dacite of Lassen Peak NE talus pile Feeley and others Whole rock California LF02-043iA 0.065 40.4936178 -121.487227 0.0001 58.51 Xenolith Dacite Dacite of Lassen Peak NE talus pile inclusion microlites Feeley and others Whole rock California LF02-043iB 0.065 40.4936178 -121.487227 0.0001 55.12 Xenolith Dacite Dacite of Lassen Peak NE talus pile inclusion microlites Feeley and others Whole rock California LF02-049 0.065 40.48303913 -121.5147881 0.0001 65.12 Volcanic Dacite Dacite of Lassen Peak W spur talus pile Feeley and others Whole rock California LF02-050 0.065 40.47695005 -121.5092599 0.0001 66.76 Volcanic Dacite Dacite of Lassen Peak S spur talus pile Feeley and others Whole rock California LF02-050iA 0.065 40.47695005 -121.5092599 0.0001 Xenolith Dacite Dacite of Lassen Peak S spur talus pile inclusion phenocrysts Bullen and Clynne Whole rock California LF02-050iA 0.065 40.47695005 -121.5092599 0.0001 55.48 Xenolith Dacite Dacite of Lassen Peak S spur talus pile inclusion microlites Feeley and others Whole rock California LF02-051 0.065 40.48316051 -121.5046512 0.0001 64.92 Volcanic Dacite Dacite of Lassen Peak SE ridge along summit trail Feeley and others Whole rock California LF02-052 0.065 40.48906008 -121.4969336 0.0001 67.65 Volcanic Dacite Dacite of Lassen Peak NE ridge along summit trail Feeley and others Whole rock California LF02-053 0.065 40.49717986 -121.5117622 0.0001 65.43 Volcanic Dacite Dacite of Lassen Peak N ridge Feeley and others Whole rock California LF02-053iA 0.065 40.49717986 -121.5117622 0.0001 58.49 Xenolith Dacite Dacite of Lassen Peak N ridge inclusion microlites Feeley and others Whole rock California LF02-053iB 0.065 40.49717986 -121.5117622 0.0001 Xenolith Dacite Dacite of Lassen Peak N ridge inclusion phenocrysts Bullen and Clynne Whole rock California LF02-053iB 0.065 40.49717986 -121.5117622 0.0001 Xenolith Dacite Dacite of Lassen Peak N ridge inclusion microlites Bullen and Clynne Whole rock California LF02-040 0.065 40.51795593 -121.4760211 0.0001 68.07 Volcanic Rhyodacite Lassen Peak (Survivor Ridge) unit Feeley and others Whole rock California LF02-042 0.065 40.47630744 -121.4765977 0.0001 69.9 Volcanic Rhyodacite Dacite of Kings Creek Feeley and others Whole rock California LF02-042iC 0.065 40.47498599 -121.4995124 0.0001 54.29 Xenolith Dacite Dacite of Kings Creek inclusion Feeley and others Whole rock California LF02-064 0.065 40.51386189 -121.4641573 0.0001 69.51 Volcanic Rhyodacite Puroclastic flow of Kings Creek Feeley and others Whole rock California LF02-060 0.065 40.55709934 -121.5302663 0.0001 69.95 Volcanic Rhyodacite Sunflower Flat north dome Bullen and Clynne Whole rock California LC84-454 0.065 40.53632268 -121.5013326 0.0001 0.70411 69.97 Volcanic Rhyodacite Sunflower Flat south dome Bullen and Clynne Whole rock California LF02-061L 0.065 40.55841922 -121.5327531 0.0001 68.8 Xenolith Rhyodacite Sunflower Flat pyroclastic flow Feeley and others Whole rock California LF02-061P 0.065 40.55841922 -121.5327531 0.0001 69.01 Volcanic Rhyodacite Sunflower Flat pyroclastic flow Bullen and Clynne Whole rock California LF02-055 0.065 40.51060459 -121.4986833 0.0001 68.28 Volcanic Rhyodacite Rhyodacite dome of Krummholz Bullen and Clynne Whole rock California LF02-054 0.065 40.50687553 -121.5028853 0.0001 69.69 Volcanic Rhyodacite Rhyodacite flow of Section 27 Bullen and Clynne Whole rock California LF02-047 0.065 40.47514163 -121.515033 0.0001 0.7039 70.82 Volcanic Rhyodacite Rhyodacite of Eagle Peak Bullen and Clynne Whole rock California LC81-706 0.3 0.19 40.47735598 -121.4497955 0.0001 0.70396 67.31 Volcanic Dacite Dacite of Reading Peak Bullen and Clynne Whole rock California LF02-056 0.3 0.19 40.50958229 -121.4962748 0.0001 65.68 Volcanic Dacite Dacite dome of Crescent Crater Bullen and Clynne Whole rock California LF02-066 0.3 0.19 40.46512747 -121.5069266 0.0001 64.44 Volcanic Dacite Dacite of Bumpass Mountain Bullen and Clynne Whole rock California LF02-067 0.3 0.19 40.47055842 -121.5166084 0.0001 66.45 Volcanic Dacite Dacite of Ski Heil Peak Bullen and Clynne Whole rock California LF02-065 0.3 0.19 40.47147544 -121.5052879 0.0001 65.26 Volcanic Dacite Dacite of Mt. Helen Feeley and others Whole rock California LF02-045 0.3 0.19 40.47253192 -121.4999209 0.0001 0.70412 64.21 Volcanic Dacite Dacite under Mt. Helen Bullen and Clynne Whole rock California LF02-046 0.3 0.19 40.47601719 -121.5102715 0.0001 0.70383 63.67 Volcanic Dacite Dacite of Lassen Peak parking lot Bullen and Clynne Whole rock California LF02-026 0.3 0.19 40.50751585 -121.5140948 0.0001 66 Volcanic Dacite Dacite dome and flow of Hill 8283 Bullen and Clynne Whole rock California LF02-024 0.3 0.19 40.50509375 -121.5254306 0.0001 66 Volcanic Dacite Dacite of Upper Manzanita Creek Bullen and Clynne Whole rock California LF02-057 0.3 0.19 40.50319154 -121.5740819 0.0001 69.26 Volcanic Rhyodacite Rhyodacite flow of Manzanita Chute Bullen and Clynne Whole rock California LF02-058 0.3 0.19 40.50319154 -121.5740819 0.0001 68.59 Volcanic Rhyodacite Rhyodacite flow of Loomis Peak Bullen and Clynne Whole rock California LF01-026 0.3 0.19 40.43080965 -121.5129437 0.0001 0.70402 69.42 Volcanic Rhyodacite Rhyodacite of Mt. Conrad Bullen and Clynne Whole rock California LF01-027 0.31 40.49033824 -121.5072646 0.0001 62.78 Volcanic Dacite "Dacite dome of 14-19 May 1915, phenocrysts" Feeley and others Whole rock California LF01-028B 0.31 40.53498744 -121.5116225 0.0001 Xenolith Dacite "Dacite dome of 14-19 May 1915, inclusion phenocrysts" Bullen and Clynne Whole rock California LF01-028B m 0.31 40.53498744 -121.5116225 0.0001 57.05 Xenolith Dacite "Dacite dome of 14-19 May 1915, inclusion microlites" Feeley and others Whole rock California LF01-028C 0.31 40.53498744 -121.5116225 0.0001 Xenolith Dacite "Dacite dome of 14-19 May 1915, inclusion phenocrysts" Bullen and Clynne Whole rock California LF01-028C m 0.31 40.53498744 -121.5116225 0.0001 60.01 Xenolith Dacite "Dacite dome of 14-19 May 1915, inclusion microlites" Feeley and others Whole rock California LF01-028D 0.31 40.53498744 -121.5116225 0.0001 Xenolith Dacite "Dacite dome of 14-19 May 1915, inclusion phenocrysts" Bullen and Clynne Whole rock California LF01-028D m 0.31 40.53498744 -121.5116225 0.0001 57.02 Xenolith Dacite Dacite dome of 14-19 May 1915. inclusion microlites Feeley and others Whole rock California LF01-029 0.31 40.48823203 -121.5074057 0.0001 63.37 Volcanic Dacite "Dacite lava of 14-19 May 1915, phenocrysts" Feeley and others Whole rock California LF01-030A 0.31 40.48823203 -121.5074057 0.0001 Xenolith Dacite "Dacite lava of 14-19 May 1915, inclusion phenocrysts" Bullen and Clynne Whole rock California LF01-030A m 0.31 40.48823203 -121.5074057 0.0001 56.7 Xenolith Dacite "Dacite lava of 19-20 May 1915, inclusion microlites" Feeley and others Whole rock California LF01-030B 0.31 40.48823203 -121.5074057 0.0001 57.94 Xenolith Dacite "Dacite lava of 19-20 May 1915, inclusion phenocrysts" Feeley and others Whole rock California LF01-030B m 0.31 40.48823203 -121.5074057 0.0001 57.94 Xenolith Dacite "Dacite lava of 19-20 May 1915, inclusion microlites" Feeley and others Whole rock California LF01-032 0.31 40.51331071 -121.4694576 0.0001 63.9 Volcanic Dacite "22 May 1915, pyroclastic flow light pumice" Feeley and others Whole rock California LF01-034 0.31 40.51482629 -121.4675818 0.0001 0.70422 59.5 Volcanic Andesite "22 May 1915, pyroclastic flow dark pumice" Feeley and others Whole rock California LF02-048A 0.31 40.47359019 -121.5176859 0.0001 0.70373 68.26 Volcanic Rhyodacite Mixed lava deposit of Eagle Peak light pumice Bullen and Clynne Whole rock California LF02-048B 0.31 40.47359019 -121.5176859 0.0001 0.70318 61.04 Volcanic Dacite Mixed lava deposit of Eagle Peak dark pumice Bullen and Clynne Whole rock California LF02-003 0.31 40.62519333 -121.3395998 0.0001 0.70415 57.47 Volcanic Andesite Flow between West Prospect and Prospect Peaks Bullen and Clynne Whole rock California LF02-059 0.31 40.56179845 -121.2913117 0.0001 0.70406 55.65 Volcanic Basaltic Andesite Cinder Cone: Fantastic Lava Bed 2 Bullen and Clynne Whole rock California LF03-101Q 0.31 40.54875247 -121.3181666 0.0001 Xenolith Basaltic Andesite Cinder Cone xenolith Bullen and Clynne Whole rock California CCPX-1 0.31 40.54875247 -121.3181666 0.0001 Xenolith Basaltic Andesite Cinder Cone xenolith Bullen and Clynne Whole rock California LF02-068 0.31 40.56103626 -121.4843164 0.0001 57.7 Volcanic Andesite Andesite flow of Raker Peak Bullen and Clynne Whole rock California Method Data 1 UNK 57 2 REG 2008-130075 3 MC-ICP-MS:WR 1999-033782 4 NN 1999-055348 5 XRF 299 6 XRF 1990-067970 Normalization Data Item 87Sr/86Sr Method Number 3 Standard Name Unknown Fractionation Data Method Number 3 Item 87Sr/86Sr 0.1194 Reference Data 3 GeoRef# 1999-033782 TI "A complex magma mixing origin for rocks erupted in 1915, Lassen Peak, California" AU "Clynne, Michael A" AF "U. S. Geological Survey, Menlo Park, CA, United States (USA)" PB "Clarendon Press, Oxford, United Kingdom (GBR)" LA English FE References: 60; illus. incl. 9 tables PY 1999 PT Serial; Analytic CP United Kingdom (GBR) LL "Latitude:N403000,N402999 Longitude:W1213000,W1213000" CL "05A, Igneous and metamorphic petrology" CY "GeoRef, Copyright 2007, American Geological Institute." UD 199912 AN 1999-033781 Reference Data 4 Georef# 1999-055348 TI "Magmatic interactions as recorded in plagioclase phenocrysts of Chaos Crags, Lassen volcanic center, California" AU "Tepley, F J, III; Davidson, Jon P; Clynne, M A" AF "University of California at Los Angeles, Department of Earth and Space Sciences, Los Angeles, CA, United States (USA)" AF "U. S. Geological Survey, United States (USA)" PB " Clarendon Press, Oxford, United Kingdom (GBR)" LA English FE References: 42; illus. incl. 6 tables PY 1999 PT Serial; Analytic CP United Kingdom (GBR) LL "Latitude:N402500,N403500 Longitude:W1211700,W1213700" CL 02D Isotope geochemistry; 05A Igneous and metamorphic petrology CY "GeoRef, Copyright 2007, American Geological Institute." UD 199919 AN 1999-055348 Reference Data 6 Georef# 1990-067970 TI Trace element and isotopic constraints on magmatic evolution at Lassen volcanic center AU "Bullen, Thomas D; Clynne, Michael A" AF "U. S. Geol. Surv., Menlo Park, CA, United States (USA)" MT "Special section on Geological, geophysical, and tectonic setting of the Cascade Range [modified]" CF "Geological, geophysical, and tectonic setting of the Cascade Range, Monterey, CA, United States, Dec. 1-4, 1988" PB "American Geophysical Union, Washington, DC, United States (USA)" LA English FE References: 46; illus. incl. 1 table PY 1990 PT Serial; Conference document; Analytic CP United States (USA) LL "Latitude:N402000,N403600 Longitude:W1211100,W1204500" CL "02C Geochemistry of rocks, soils, and sediments; 05A Igneous and metamorphic petrology" CY "GeoRef, Copyright 2008, American Geological Institute." UD 199000 AN 1990-067969