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age Diagram: 3 show ring si emiquantitatfve-spectrographic-analysis data for sel lected m - meta llic elements and relation to rnoraine source 0 . . . areas or 'l'rlaent Glacier .............. ....... .................. Map of Trident Glacier, showing medial m ~ r ines a ; sampled and geochemically anomalous exploration-target BPCfiS inferred from sample analyses. ...................... ....... .................. Photograph of plant fossils from the conglomerate of Mount Dall Talkoetno quadrangle ........................................... Map showing distribution of northern Permian floras..... ......... Quaternary section measured in a Dadina River bluff, Copper River basin, Valdez D-3 quadrangle .................................... Sketch map of the Cook Inlet region, showing major Quaternary volcanoes and approximate locations of lakes where bottomsediment cores were taken..... .................................. Index map of the upper Cook Inlet region, showing location of study area and approximate distribution of intertidal mudflats at low tide, .................................................... 10 5 Photograph showing intertidal bluffs resulting from erosion by by tidewater...... .............................................. 16 6 Photograph showing planar and convoluted bedding in sediment exposed in intertidal bluff ..................................... 10 7 Photograph of intertidal-bluff outcrop, showing planer-bedded sequence truncating an underlying convoluted sequence..... ...... rnw Photographs showing products of erosion of intertidal bluffs ..... Curves showing rate of sedimentation, mount of uplift, and sediment-surface elevation relative to post-1964 earthquake elevation in Portage area ...................................... Map showing areas and localities in southeastern Alaska discussed in this volume. ................................................. Geologic sketch map of southern Prince of Wales Island and index map showing several Alexander terrane localities......... ....... Diagram showing zircon ages on rock samples from localities in the southern Alexander terrane. ................................. Geologic sketch map of southern Annette and Hotspur Islands.. .... Map of the Alexander terrane in the vicinity of the Screen Islands and Keku Strait ........................................ Lithologic map of the Screen Islands, showing fossil localities.. Map of part of the Petersburg A-3 quadrangle, showing locations of paleomegnetic-sample sites on Marsh Island.. ................. Map of southeastern Alaska and northwestern British Columbia, showing selected metamorphic zones and units ................... Map of the Petersburg quadrangle, showing approximate locations of Cretaceous and Cretaceous(?) granitic plutons ................ Diagram showing modal compositions of granitic rocks of Cretaceous and Cretaceous(?) age from the Lindenberg Peninsula and Mitkof Isiand........... .................................... Geologic sketch map of gabbro complex near Ketchikan............. Schematic geologic map of central Etolin Island in southeast corner of Petersburg quadrangle, showing plutons.. .............. Compositional diagram showing modes of stained-slab samples from Burnett Inlet body on central Etolin Island............ ......... Sketch map of the Juneau area, showing regional distribution of metamorphic facies and relation to plutonic units of West margin of Coast Mountains batholithic complex.., ................ Geologic sketch map of the Ketchikan area, showing locations of samples utilized for oxygen-isotope analyses .................... Diagram showing oxygen-isotope values for various trondhjernitic rocks ........................................................... Diagram showing oxygen-isotope values of analyzed samples versus distance of sample locality west of Coast plutonic complex boundary ....................................................... Diagram showing oxygen-isotope values of analyzed samples versus distance of sample locality fr~m west edge of Coast plutonic comp 1 I............... ................................
. , ".,k a. ,.e ,\a 1 y U11 IIIUUII LU l llY . . . . . . . . . . . . . . . r r r . . . . . . . . . . . . . . . . . . . . . 3 2 Selected trace-element geochemistry of altered rocks from Sunrise dome... .................................................. 3 3 Ages of radiolarians from Rampart distriot chert looallties....... 4 2 Uranium-lead isotopic data and ages for detrital zircons, Yukon-Tanana Upland .....................,,.,...........4.m,..... 4 4 Major-element data for sillimanite gneiss from the Big Delta quadrangle ........................................................ 4 6 Uranium-lead isotopic data and ages tor stllimanite gneiss and granite from the Big Delta quadrangle ....................... 4 7 Modal analyses of samples from the Big Delta quadrangle ........... 5 1 Trace-element data for samples from the Big Delta quadrangle ...... 5 2 Electron-microprobe analyses of pyroxene and garnet from metamorphic rocks along the Pinnell Mountain trail .............. 5 6 Electron-microprobe analyses of minerals In eclogite sample, Circle quadrangle ............................................... 5 8 General petrography of major rock units in the Pingston terrane, eastern Alaska Range ................................... 7 3 Uranium-lead isotopic data and ages of zircons from the Pingston terrane ................................................. 7 4 Potassium-argon ages of voloanic rocks from the Matanuska Valley and the southern Telkeetna Mountains................ ..... 8 4 Strontium-isotopic analyses and selected chemical data for volcanic rocks from the Matanuska Valley ........................ 8 5 Five-factor R-mode factor analysis of stream-sediment sample data, Cordova quadrangle ...... ;............................,.,,, Q 1 Four-factor R-mode factor analysis of stream-sediment sample data, Seward quadrangle ......................................... 91 Paleomegnetic data of Gravina-Nutzotln belt rocks on Marsh Island. .......................................,.........,,,,..., 119 Mean paleomagnetlc data on four Gravina-Nutzotin belt beds on Marsh Island. ................................................ 119
Page 1 and 2: n Alas Accompli: ' I.S. GE OLOGI CA
Page 3 and 4: I CONTENTS Page A bst raet ........
Page 5 and 6: -- --A I ALASEU i nued rral expluru
Page 7: ........ igure .JB. ;5~ercn map ox
Page 11: THE UNITED STATES GEOLOGICAL SURVEY
Page 15 and 16: ~ t I r n t S i m ~ ~ Alarr a ~ man
Page 17 and 18: I -1977, RelImlnary documentat!on l
Page 19 and 20: I I MaCenn, W. R., Perez, 0. J., an
Page 21 and 22: were deslgned to impMve the accurac
Page 23 and 24: Noatak Sandstom and is overlaln con
Page 25 and 26: I (Nilsen and others, 1981a); (2) f
Page 27 and 28: I that contains the Upper Devonian
Page 29 and 30: who found Westeqaardodina sp., posb
Page 31 and 32: Table 2 lists the means rtnd for th
Page 33 and 34: ' Noatak Vdley (fig. 129. This ice
Page 35 and 36: 3 EUMN OF MAP UNITS WAmWARY OUAERNA
Page 37 and 38: -om displacement of the cc tween th
Page 39 and 40: I US I Surlicial dcnrrua,ts [~dater
Page 41 and 42: I Plafker, George, Hudson, Travis,
Page 43 and 44: !omlensed iring vapors generated by
Page 45 and 46: and the thinning. -upward cycles .,
Page 47 and 48: Kellum, L. B., Devless, S. N., and
Page 49 and 50: 1912 sample (a mediumwey pumice blo
Page 51 and 52: various Utholagic units present Thu
Page 53 and 54: fault, and Its depositional basemen
Page 55 and 56: suggested by coplanar foUaticm and
Page 57 and 58: 1 slgnlficarrtly more umnlum (73&1,
Page 59 and 60:
ecrSigtallized catadastic matrix of
Page 61 and 62:
analyzed to determine whether Immob
Page 63 and 64:
are tgplcd of both ocean-floor basa
Page 65 and 66:
& Fclsic in~rutirt rucks 0 Eio~ite
Page 67 and 68:
are Lrdlcated by coexisting @&ite+q
Page 69 and 70:
(Mg3.09 pe2+ 0.69 pe 0.~1~0.01~~0.9
Page 71 and 72:
westward into a narrow band that ex
Page 73 and 74:
EXF'lANATIOW 66600' Contan-Apprnimn
Page 75 and 76:
! few fold closures are preserved.
Page 77 and 78:
even thickness and conform to irreg
Page 79 and 80:
(Alnus ap.), heaths (Ericaceae, + E
Page 81 and 82:
terrane extends at least 300 krn to
Page 83 and 84:
Table 19.--6tneral petrography of M
Page 85 and 86:
were measured on 8 12-in. mass spec
Page 87 and 88:
Thin lenses of cabonate packtone to
Page 89 and 90:
The cantwell(?) Pormation south of
Page 91 and 92:
in the 18 lava flows b thermoremane
Page 93 and 94:
Upper Cretaceous shale in contact w
Page 95 and 96:
Gran tz, Arthur, 1960, Generalized
Page 97 and 98:
at 15 to 20 percent. Primary Inolus
Page 99 and 100:
addition, this factor generally def
Page 101 and 102:
Joreskog, K. G., Klovan, J. E., and
Page 103 and 104:
Mineral qItWation end r ~ k t k W e
Page 105 and 106:
1 "~_liO-/ 200 1000 B roo C E % A B
Page 107 and 108:
Smaller placer mines ere active on
Page 109 and 110:
Figme 62.-Plant fassils from the co
Page 111 and 112:
Hallam, Anthony, 1975, Alfred Wegen
Page 113 and 114:
u ALASKA Figure 65.--Sketch map of
Page 115 and 116:
F ' i a?.-Intertidal bluffs compose
Page 117 and 118:
C-s - - Figure 70.-Products of eros
Page 119 and 120:
curve is based indicates that 6.1 c
Page 121 and 122:
sampled is related to widespread ma
Page 123 and 124:
marble is alsa locally present In t
Page 125 and 126:
Bedding in the conglomerate ranges
Page 127 and 128:
1 purpose of this study wes to dete
Page 129 and 130:
The secona k~~-~ri?tation mmes that
Page 131 and 132:
epizonb'l granitic Miss, mixed with
Page 133 and 134:
40 40 Forbes, R. B., and Engels, J.
Page 135 and 136:
foliated and inequigranular end con
Page 137 and 138:
I I thy euheclra. Sphene anhedra an
Page 139 and 140:
Quartz Alkali feldspar Plagioclase
Page 141 and 142:
F'@m 85.--Sketch map of Juneau area
Page 143 and 144:
HoUister, L. 8, 1966, Garnet zoning
Page 145 and 146:
! ~ bI8oO, (IN PERMIL) ~lqp~e 87.-8
Page 147 and 148:
Figure 90.-Offshore ereas discussed
Page 149 and 150:
Preliminerg analpsis of miemfauna f
Page 151 and 152:
Survey tn Alaekai AccompUshments hh
Page 153 and 154:
Gecllogical Survey Open-File Report
Page 155 and 156:
I provenance, and tectonia sIgnific
Page 157 and 158:
Keith, T. E. C, Barnes, Ivan, afrd
Page 159 and 160:
Open-Flle Report 8P811C, 19 p. + 2
Page 161 and 162:
United States Qeological Survey in
Page 163 and 164:
, ,. nldslra poblisbe!d by Prior, D
Page 165 and 166:
60, Alaska: Offshore Technology Con
Page 167:
Author Index [Page number underscor
Page 170 and 171:
Parks. Bruce ......................
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