Date File Created Name of Creator 2/18/2009 Will Frazier GeoRef Data 2007-028091 DN GeoRef TI Petrology and geochemistry of the Middle Jurassic Ironside MountainBatholith; evolution of potassic magmas in a primitive arc setting AU "Barnes, Calvin G; Mars, Elizabeth V; Swapp, Susan; Frost, Carol D" AF "Texas Tech University, Department of Geosciences, Lubbock, TX, UnitedStates (USA)" AF "Texas Tech University, United States (USA); University of Wyoming,United States (USA)" MT "Geological studies in the Klamath Mountains province, California andOregon; a volume in honor of William P. Irwin" ED "Snoke, Arthur W; Barnes, Calvin G" AF "University of Wyoming, Department of Geology and Geophysics, Laramie,WY, United States (USA)" SO "Special Paper - Geological Society of America, vol.410, pp.199-221,2006" IS 0072-1077 CD GSAPAZ IB 0813724104; 978081372410 PB "Geological Society of America (GSA), Boulder, CO, United States (USA)" DE alkaline earth metals; assimilation; aureoles; basalts; batholiths;chemical composition; chemical fractionation; Denny Complex;differentiation; diorites; emplacement; faults; gabbros; geochemistry;Happy Camp Mountain; host rocks; igneous rocks; intrusions; IronsideMountain Batholith; isotope ratios; isotopes; Jurassic; KlamathMountains; magmas; magmatism; major elements; melting; Mesozoic;metals; Middle Jurassic; mineral assemblages; plutonic rocks; potassiccomposition; pressure; pyroxenite; quartz diorites; Sr-87/Sr-86;stable isotopes; strontium; tholeiite; thrust faults; trace elements;ultramafics; United States; variations; volcanic rocks; water; WestChina Peak Complex AB "The Ironside Mountain batholith consists of the 170-Ma IronsideMountain pluton, the quartz diorite of Happy Camp Mountain, the 167-MaDenny intrusive complex, and the West China Peak intrusive complex.The contact aureole of the Ironside Mountain pluton is present in boththe western and eastern Hayfork terranes, which indicates thatemplacement followed regional thrusting along the Wilson Point thrust.The batholith marks the beginning of a 15-m.y.-long episode of arcmagmatism. Al-in-hornblende barometry suggests emplacement atapproximately 4 kb. The Denny and West China Peak complexes arepredominantly gabbro to olivine pyroxenite characterized by calcicplagioclase. Along with the quartz diorite of Happy Camp Mountain,these plutons have calcic bulk compositions, abundant amphibole, andlow FeO/(FeO+MgO). Their chemical and petrographic features suggestoxidized, H (sub 2) O-rich parental magmas. In contrast, the IronsideMountain pluton has higher FeO/(FeO+MgO), shows K (sub 2) O enrichmentwith increasing SiO (sub 2) to ultrahigh-K compositions, and istypified by 2- and 3-pyroxene assemblages in which hydrous maficsilicates are sparse or absent, except in the most evolved rocks. Theelements Rb, Zr, and Ba all behave incompatibly. Initial Nd and Srisotope ratios (170 Ma) are uniform at epsilon (sub Nd) ofapproximately 5.2 and (super 87) Sr/ (super 86) Sr of approximately0.7037. These data suggest that the pluton lacks significant crustalinput, unlike younger Middle Jurassic plutons, and that it evolvedprimarily by fractional crystallization of a reduced, H (sub 2) O-poorarc tholeiite. Enrichment of K (sub 2) O is interpreted to result fromdifferentiation at relatively high pressure (> or =8 kb), underconditions in which augite fractionation predominated over olivinefractionation. High-P fractionation without appreciable crustal inputis probably related to the thermal structure of the crust. Emplacementimmediately after regional thrusting placed parental magmas into cool,nonreactive host rocks. Succeeding Middle Jurassic magmatismencountered progressively hotter crust, with consequent crustalmelting and assimilation." LA English FE "References: 69; illus. incl. 7 tables, sketch map" PY 2006 PT Serial; Analytic CP United States (USA) LL "Latitude:N410000,N430000 Longitude:W1230000,W1243000" CL 05A Igneous and metamorphic petrology; 02D Isotope geochemistry CY "GeoRef, Copyright 2007, American Geological Institute." UD 200708 DO 10.1130/2006.2410(10) AN 2007-028091 JV 410 JP 199-221 Sample Data Item LatDD LongDD Loc_prec Location Max_age Min_age SiO2 TiO2 Al2O3 Fe2O3 FeO MnO MgO CaO Na2O K2O P2O5 LOI Rb Sr Zr Y Nb Ba Sc V Cr Ni Cu Zn La Ce Nd Sm Eu Tb Yb Lu Cs Hf U Th Ta Rock_type Rock_class Sample_description Collected_by Material State Units DD DD Ma Ma wt% wt% wt% wt% wt% wt% wt% wt% wt% wt% wt% wt% ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm Method 1 1 6 6 2 2 2 2 2 2 2 2 2 2 2 2 3 2 2 2 2 2 2 2 2 2 2 2 4 4 4 4 4 4 4 4 4 5 4 5 5 Sample Name OMB11A 41.1537 -123.5051 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzodiorite Biotite-bearing pyroxene monzodiorite Barnes and others Whole Rock California OMB11B 41.1537 -123.5051 0.0001 Ironside Mountain Pluton 170 169 Plutonic Diorite Dioritic dike Barnes and others Whole Rock California OMB1588A 41.1518 -123.5139 0.0001 Ironside Mountain Pluton 170 169 54.96 0.74 16.94 2.6 6.72 0.18 3.52 7.6 2.96 2.59 0.44 1.83 73 654 87 27 9 751 24 215 16 120 94 Plutonic Monzodiorite Quartz and biotite-bearing three pyroxene monzodiorite Barnes and others Whole Rock California OMB1588B 41.1518 -123.5139 0.0001 Ironside Mountain Pluton 170 169 52.68 0.59 17.44 2.04 7.65 0.22 4.25 8.67 3.08 1.66 0.28 1.73 47 695 48 22.6 4 523 28.8 206 22 53 94 Plutonic Monzodiorite Biotite-bearing three pyroxene monzodiorite; mafic enclave Barnes and others Whole Rock California OMB1588C 41.1518 -123.5139 0.0001 Ironside Mountain Pluton 170 169 Plutonic Gabbro Biotite-bearing three pyroxene gabbro; mafic enclave Barnes and others Whole Rock California OMB1688 41.1392 -123.5293 0.0001 Ironside Mountain Pluton 170 169 54.65 0.75 17.17 2.61 6.99 0.2 3.73 8 3.05 2.42 0.41 1.06 62 699 91 25.8 9 747 24.7 227 18 57 98 Plutonic Monzogabbro Quartz-bearing biotite three pyroxene monzogabbro Barnes and others Whole Rock California OMB1788 41.1088 -123.5706 0.0001 Ironside Mountain Pluton 170 169 53.8 0.67 17.32 3.01 6.25 0.19 3.57 7.81 2.91 2.46 0.34 1.72 65 626 41 27 8 740 25.4 222 15 75 96 Plutonic Monzodiorite Biotite three pyroxene quartz monzodiorite Barnes and others Whole Rock California OMB1888 41.1011 -123.5029 0.0001 Ironside Mountain Pluton 170 169 56.75 0.73 16.19 1.97 6.64 0.18 3.03 6.35 3.02 3.76 0.41 1.31 104 591 109 29.2 9 1357 21.2 170 19 88 97 Plutonic Monzodiorite Biotite hornblende three pyroxene quartz monzodiorite Barnes and others Whole Rock California OMB1988 41.0822 -123.5141 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzodiorite Biotite three pyroxene quartz monzodiorite Barnes and others Whole Rock California OMB491 41.1153 -123.5706 0.0001 Ironside Mountain Pluton 170 169 50.42 0.91 17.72 2.69 8.12 0.2 4.7 10.37 2.62 0.85 0.13 0.97 19 580 35 15 2 424 33.9 380 42 60 93 Plutonic Monzodiorite Biotite three pyroxene monzodiorite Barnes and others Whole Rock California OMB791 41.1098 -123.5741 0.0001 Ironside Mountain Pluton 170 169 Plutonic Diorite Altered biotite hornblende two pyroxene diorite Barnes and others Whole Rock California OMB991 41.1434 -123.5064 0.0001 Ironside Mountain Pluton 170 169 55.33 0.74 16.7 1.79 7.26 0.19 3.25 7.39 2.98 2.96 0.4 0.99 74 644 142 27.7 5 1089 25.1 203 36 26 81 86 30.93 53.55 28.36 6.293 1.76 0.833 2.31 0.352 1.48 3.53 1.31 3.55 0.273 Plutonic Monzodiorite Quartz-bearing biotite three pyroxene monzodiorite Barnes and others Whole Rock California OMB1191 41.137 -123.4835 0.0001 Ironside Mountain Pluton 170 169 58.08 0.72 15.95 2.1 6.57 0.17 2.48 5.74 3.12 3.85 0.42 1.35 106 472 218 35.8 11 923 22 160 20 23 114 87 43.11 79.53 40.4 8.505 1.683 1.051 2.86 0.44 2.71 4.58 3.27 8.86 0.456 Plutonic Monzonite Biotite hornblende three pyroxene quartz monzonite Barnes and others Whole Rock California OMB1391 41.1436 -123.4965 0.0001 Ironside Mountain Pluton 170 169 Plutonic Lamprophyre Hornblende lamprophyre dike Barnes and others Whole Rock California OMB1491 41.1353 -123.5199 0.0001 Ironside Mountain Pluton 170 169 53.35 0.77 16.38 3.64 6.95 0.22 3.98 8.38 2.81 1.7 0.5 1.28 48 640 31 26.6 4 499 30.2 285 27 22 174 105 Plutonic Monzodiorite Biotite three pyroxene quartz monzodiorite Barnes and others Whole Rock California OMB1591A 41.1167 -123.4811 0.0001 Ironside Mountain Pluton 170 169 55.33 0.8 16.08 2.23 6.99 0.18 2.89 6.58 2.84 3.09 0.47 1.16 86 516 141 33.6 7 775 26.1 209 13 147 94 38.53 71.16 36.33 7.825 1.851 0.952 2.709 0.42 1.94 3.69 2.08 6.12 0.356 Plutonic Monzodiorite Biotite hornblende three pyroxene quartz monzodiorite Barnes and others Whole Rock California OMB1591B 41.1167 -123.4811 0.0001 Ironside Mountain Pluton 170 169 52.55 0.76 16.31 2.72 8.05 0.25 3.92 8.52 3.05 1.5 0.44 1.39 36 517 69 31.8 3 404 34.8 242 25 88 99 Plutonic Monzodiorite Three-pyroxene quartz monzodiorite Barnes and others Whole Rock California OMB1691 41.1152 -123.4801 0.0001 Ironside Mountain Pluton 170 169 73.89 0.12 14.1 0.13 1.09 0.02 0.24 1.07 2.97 5.7 0.05 0.99 183 377 93 4.2 2 1427 1.2 11 7 15 Plutonic Granite Biotite granite dike Barnes and others Whole Rock California OMB1891 41.1091 -123.4832 0.0001 Ironside Mountain Pluton 170 169 39.53 70.15 34.14 7.204 1.589 0.8407 2.285 0.3569 2.63 4.05 3.1 8.42 0.439 Plutonic Monzonite Biotite hornblende two pyroxene quartz monzonite Barnes and others Whole Rock California OMB2091 41.1021 -123.4922 0.0001 Ironside Mountain Pluton 170 169 Plutonic Gabbronorite Olivine and biotite-bearing gabbronorite Barnes and others Whole Rock California 92OMB1 40.8276 -123.4161 0.0001 Ironside Mountain Pluton 170 169 Plutonic Appinite Augite hornblende appinite Barnes and others Whole Rock California 92OMB3 40.8356 -123.4307 0.0001 Ironside Mountain Pluton 170 169 48.86 0.86 20.07 10.29 0.18 3.22 9.48 3.44 0.86 0.96 1.5 18 1476 17 21.6 3 820 17.2 180 17 24 6 90 Plutonic Diorite Quartz-bearing biotite two pyroxene diorite Barnes and others Whole Rock California 92OMB4 40.8346 -123.4343 0.0001 Ironside Mountain Pluton 170 169 47.01 0.93 20.15 11.86 0.21 4.39 10.51 3.08 0.98 0.51 1.57 17 1066 44 34 3 367 35.8 255 20 45 88 Plutonic Diorite Hornblende diorite Barnes and others Whole Rock California 92OMB5 40.8336 -123.4358 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzodiorite Hornblende-bearing biotite two pyroxene quartz monzodiorite Barnes and others Whole Rock California 92OMB7 40.8346 -123.4424 0.0001 Ironside Mountain Pluton 170 169 Plutonic Diorite Two-pyroxene diorite; mafic enclave Barnes and others Whole Rock California 92OMB11 40.8286 -123.412 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzodiorite Two-pyroxene hornblende quartz monzodiorite Barnes and others Whole Rock California 92OMB12 40.8296 -123.3976 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzodiorite Augite hornblende quartz monzodiorite Barnes and others Whole Rock California 92OMB22 40.8932 -123.4663 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzodiorite Biotite two pyroxene hornblende quartz monzodiorite Barnes and others Whole Rock California 92OMB23 40.8994 -123.4682 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzodiorite Biotite hornblende quartz monzodiorite Barnes and others Whole Rock California 92OMB25 40.9237 -123.4656 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzonite Pyroxene and biotite-bearing hornblende quartz monzonite Barnes and others Whole Rock California 92OMB32 40.9818 -123.4323 0.0001 Ironside Mountain Pluton 170 169 Plutonic Diorite Quartz and K-feldspar-bearing hornblende biotite diorite Barnes and others Whole Rock California 92OMB35 41.0131 -123.4265 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzonite Biotite and quartz-bearing hornblende three pyroxene monzonite Barnes and others Whole Rock California 92OMB36 40.9983 -123.4265 0.0001 Ironside Mountain Pluton 170 169 Plutonic Granite Biotite hornblende granite Barnes and others Whole Rock California 92OMB38 40.9711 -123.4743 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzonite Augite-bearing biotite hornblende quartz monzonite Barnes and others Whole Rock California 92OMB39 40.9755 -123.4841 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzodiorite Biotite-bearing hornblende quartz monzodiorite Barnes and others Whole Rock California 92OMB40 40.9453 -123.4737 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzodiorite Biotite hornblende quartz monzodiorite Barnes and others Whole Rock California 92OMB43 40.9219 -123.5016 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzonite Biotite and pyroxene-bearing hornblende quartz monzonite Barnes and others Whole Rock California 92OMB44 40.9251 -123.5014 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzonite Biotite-bearing pyroxene quartz monzonite Barnes and others Whole Rock California 92OMB54 40.9818 -123.5091 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzonite Biotite two pyroxene hornblende quartz monzonite Barnes and others Whole Rock California 92OMB55 40.9307 -123.4847 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzonite Biotite two pyroxene hornblende quartz monzonite Barnes and others Whole Rock California 92OMB57 40.9062 -123.4904 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzonite Biotite hornblende quartz monzonite Barnes and others Whole Rock California 92OMB58 40.9023 -123.4891 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzodiorite Hornblende biotite two pyroxene quartz monzodiorite Barnes and others Whole Rock California 92OMB61 40.7899 -123.4138 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzodiorite Biotite-bearing pyroxene monzodiorite Barnes and others Whole Rock California 92OMB67 40.7486 -123.3905 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzodiorite Biotite hornblende two pyroxene monzodiorite Barnes and others Whole Rock California 92OMB70 40.7468 -123.4272 0.0001 Ironside Mountain Pluton 170 169 Plutonic Granodiorite Hornblende biotite granodiorite dike Barnes and others Whole Rock California 92OMB113 41.1065 -123.4775 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzonite Quartz-bearing two pyroxene hornblende monzonite Barnes and others Whole Rock California 92OMB207 41.0697 -123.5003 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzodiorite Quartz-bearing biotite three pyroxene monzodiorite Barnes and others Whole Rock California 92OMB116A 41.0975 -123.4633 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzodiorite Biotite two pyroxene hornblende quartz monzodiorite Barnes and others Whole Rock California 92OMB117 41.0856 -123.4575 0.0001 Ironside Mountain Pluton 170 169 Plutonic Diorite Biotite three pyroxene mdiorite; mafic enclave Barnes and others Whole Rock California 92OMB118 41.085 -123.4569 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzodiorite Biotite two pyroxene quartz monzodiorite Barnes and others Whole Rock California 92OMB121 41.0739 -123.4558 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzodiorite Quartz-bearing biotite three pyroxene monzodiorite Barnes and others Whole Rock California 92OMB188 41.1022 -123.4789 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzodiorite Biotite two pyroxene quartz monzodiorite Barnes and others Whole Rock California 92OMB220A 41.085 -123.4031 0.0001 Ironside Mountain Pluton 170 169 Plutonic Pyroxenite Olivine pyroxenite Barnes and others Whole Rock California 92OMB220B 41.085 -123.4031 0.0001 Ironside Mountain Pluton 170 169 Plutonic Gabbronorite Gabbronorite Barnes and others Whole Rock California 93OMB224 40.6878 -123.3931 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzodiorite Biotite hornblende quartz monzodiorite Barnes and others Whole Rock California 93OMB227 40.7081 -123.42 0.0001 Ironside Mountain Pluton 170 169 Plutonic Monzodiorite Biotite and quartz-bearing two pyroxene monzodiorite Barnes and others Whole Rock California 92OMB19 40.8897 -123.468 0.0001 Happy Camp Mountain 170 169 Plutonic Monzonite Pyroxene-bearing biotite hornblende quartz monzonite Barnes and others Whole Rock California 92OMB24 40.9108 -123.4715 0.0001 Happy Camp Mountain 170 169 60.69 0.53 15.59 6.28 0.12 3.42 6.07 2.97 1.26 0.14 2.05 32 437 103 19.8 6 639 19 164 72 49 54 64 Plutonic Diorite Biotite augite hornblende quartz diorite Barnes and others Whole Rock California 93OMB247 40.8894 -123.4472 0.0001 Happy Camp Mountain 170 169 59.58 0.61 16.15 7.73 0.14 3.64 7 2.57 1.42 0.24 1.45 34 625 96 21.1 4 555 20.4 208 59 89 91 Plutonic Diorite Biotite two pyroxene quartz diorite Barnes and others Whole Rock California 92OMB13 40.8814 -123.3614 0.0001 West China Peak Complex 170 169 51.07 0.78 14.97 10.62 0.2 6.05 9.92 2.52 2.29 0.42 0.5 53 736 70 24.1 5 688 35.3 234 129 50 39 84 Plutonic Diorite Quartz-bearing biotite augite diorite Barnes and others Whole Rock California 92OMB14A 40.8867 -123.3517 0.0001 West China Peak Complex 170 169 Plutonic Pyroxenite Olivine pyroxenite Barnes and others Whole Rock California 92OMB15 40.8839 -123.3525 0.0001 West China Peak Complex 170 169 48.78 1 13.46 11.39 0.21 7.78 11.81 1.93 2.09 0.73 1.12 58 962 45 29.9 7 1093 35.5 290 228 48 115 92 Plutonic Diorite Quartz-bearing hornblende biotite two pyroxene diorite Barnes and others Whole Rock California 92OMB15G 40.9094 -123.3481 0.0001 West China Peak Complex 170 169 Plutonic Monzodiorite Biotite hornblende augite monzodiorite Barnes and others Whole Rock California 93OMB244 40.9272 -123.3964 0.0001 Denny Complex 170 169 60.65 0.59 16.49 6.84 0.13 3.54 6.64 2.88 1.66 0.16 0.75 36 557 87 19 3 830 24.3 134 50 27 10 83 Plutonic Diorite Hornblende biotite two pyroxene quartz diorite Barnes and others Whole Rock California 93OMB245 40.925 -123.4056 0.0001 Denny Complex 170 169 53.07 0.6 15.09 9.4 0.18 6.5 10.8 2.36 0.85 0.21 0.95 16 594 46 20.2 2 436 38.8 265 148 25 39 81 Plutonic Diorite Two-pyroxene hornblende diorite Barnes and others Whole Rock California Method Data 1 TABLE 2007-028091 2 ICPAE 457 3 FL-ES 457 4 INAA 458 5 INAA 11 6 U-PB 1988-041860 Reference Data 6 GeoRef# 1988-041860 TI "An expanded view of Jurassic orogenesis in the western United StatesCordillera; Middle Jurassic (pre-Nevadan) regional metamorphism andthrust faulting within an active arc environment, Klamath Mountains,California" AU "Wright, James E; Fahan, Mark R" AF "Stanford Univ., Dep. Geol., Stanford, CA, United States (USA)" PB "Geological Society of America (GSA), Boulder, CO, United States (USA)" DE absolute age; California; continental margin; dates; displacements;evolution; faults; geochronology; island arcs; Jurassic; K/Ar; KlamathMountains; mechanism; Mesozoic; metamorphic rocks; metamorphism;metasedimentary rocks; metavolcanic rocks; Middle Jurassic;nesosilicates; Nevadan Orogeny; North America; North AmericanCordillera; Northern California; orogeny; orthosilicates; platetectonics; regional metamorphism; silicates; thrust faults; TrinityCounty California; U/Pb; United States; zircon; zircon group LA English FE "References: 101; illus. incl. 6 tables, geol. sketch maps" PY 1988 PT Serial; Analytic CL 16 Structural geology; 05A Igneous and metamorphic petrology; 03Geochronology; 18 Solid-earth geophysics CY "GeoRef, Copyright 2007, American Geological Institute." UD 1988 AN 1988-041860