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Figure 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. L4. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. ILLUSTRATIONS Map showlng regions of Alaska used in this report. ............... Map of Alaska, showing quadrangles for which Landsat studies have been completed .................................................. Map showing epicenters of 7,298 earthquakes in the Gulf of Alaska and southern Alaska region between October 1, 1979, and Septenrber 30, 1981. ............................................. Diagram showing number of located earthquakes as a function of time for subregions of figure 3 ................................ Map showing areas in northern Alaska discussed in this volume.... Index map of the "Husky Mountainsw and Mulgrave Hills, showing locations of measured sections ................................. Stratigraphic sections of the Kanayut Conglomerate in the "Husky Mountainsn and Mulgrave Hills... ................................ Sketch map of northwest corner of the Baird Mountains quadrangle, showing teetonostratigraphic units and locations of anomalous stream-sediment samples ....................................... Generalized geologic and structural map of the Doonerak anticlinorium and adjacent areas Index map showing approxirn~te location of two major dune fields Located north of the Arctic Circle, northern Alaska. ............ Diagram showing cumulative percentage of samples analyzed versus grain size.. ................................... .................................................... Map showing paleogeography of the upper Nontak Valley during the Itkillik Glaciation and subsequent Walker Lake Glaciation....... Map showing areas in west-central Alaska discussed in this volume ..............................................-.......... Generalized geologic map of northern part of the Unalakleet quadrangle ..................................................... Geologic map of southeastern part of the Nulato quadrangle ....... Geologic map of southeastern part of the Ophir quadrangle ........ Generalized geologic map of the Kafyuh Mountains ................. Generalized geologic map of the Sunrise dome area, Medfra quadrangle ...................................................... Map showing ereas in southwestern Alaska djscussed in this volume........ .................................................... Map showing Wide Bey-Puale Bay area on the Alaska Peninsula ...... Composite str~tigraphic section of the Shelikof Formation, Alaska Peninsula... .............................................. Diagram showing variations of mejor elements for materials from the June 1912 eruption in the Valley of Ten Thousand Smokes Katmai National Park. ........................................... Map showing areas and localities in east-central Alaska discussed in this volume. ...................................... Geologic map of the Rampart district, showing locations of dated radiolarian-chert samples. ................................ Sketch map showing sample localities in the Circle, Big Delta, and Mount Aayes quadrangles ..................................... Concordia plot of uranium-lead ratios in detrital zircons from quartzite and in igneous zircons from an augen gneiss ........... Concordia plot of zlrcon from sillimanite gneiss and crosscutting granite, Big Delta quadrangle .................................. Geologic sketch map of part of the Big Delta C-2 quadrangle, .......................................... showing relations between bands of augen gneiss and intervening metasedimentary racks Photographs of slabs of augen gneiss from localities in the Big Delta C-2 quadrangle ............................................ Diagram showing chondrite-normalized rare-earth-element contents versus ionic radius for samples of arnphibolite .................. Diagram showing ehondrite-normalized rare-earth-element patterns for a composite of North American shale and representative basalt ......................................................... Page 2 4 8 9 12 13 14 16 18 2 0 2 1 2 2 2 4 2 5 2 8 2 9 3 1 3 3 3 5 3 6 3 6 3 8 40 4 1 43 44
........ igure .JB. ;5~ercn map ox rne Table Mountain study area, snowing genera~~xeu generalized geology and grade of regional metamorphism 3. Mep showing eclogite localities in eastern part of the Livengood quadrangle and western part of the Circle quadrangle ........... 54. Diagram showing results of electron-microprobe analyses of amphibole, garnet, and pyroxene in eclogite sample .............. 35. Diagram showing estimated pressure and temperature of metamorphism of eclogite sample ................................ -6. Sketch map showing sample localities and location of Ernsian limestone and associated rocks near the eastern Crazy Mountains, Circle quadrangle .............................................. 7. Photograph showing typical outcrop of Pnsian limestone in the e --stern a Crazy Mountains ........................................ 9. Geo logic maps showing radiolatian-chert loca in the no rthern part of the Circle quadrangle .... ............... 9. Sch ematic representation af four sequential ttional events . - I I1 the Circle quadrangle ....................................... I. Pho tograph showing closed Interference flgur rd by refolding 0 f folds .................................. ............... 1. Qua ternary stratigraphic seotion and radioca fes at n: nlverside Bluff.. ............................................... 2. Map of the Mount Harper region, showing limits of glacial ad vances and approximate extent of glacial Lake Harper ........., 3. Corn pos i te cutbank section of Pleistocene deposits on he Middle ,b ,C r Pol. .he Fortymile River, showing positions of C1'-dated samples ................................... ............... 44. Map showing areas and localities in southero k discussed in in this volume ................................................ 45 C;--plified geologic map of parts of the Mount Hayes C-5 end C-6 adrangles, eastern Alaska Range, showing location of dated tarhyodacite sample .......................................... cordia diagram of U-Pb-isotopic data from zircons ih metarhyo- ,,cite, Mount Hayes C-6 quadrangle, eastern Alaska Range.. ...... 7. Photograph showing prominent outcrop of the Jeanie Point complex on Montague Island ............................................. 3. Sketch mop of the Jeanie Cove area on southeast coast of Montague Island, showing where rocks of the Jeanie Point complex and other rocks crop out ........................................... 49. Generalized geologic map showing Cretaceous plutonic rocks and the McKinley fault in the Healy quadrangle ..................... 50. Map of the Cantwell basin erea, showing paleomagnetic sampling ... sites in volcanic rocks of the Cantwell Formation ............... 1. Map showing locations of paleomagnetic poles in North America snd the Cantwell Formation study area....................,,......... 1. Index map of part of southern Alaska, showing locations of Metanuska Valley area and major physiographic features.......... . Geologic sketch map of the Matanuska Valley area, showing distribution of volcanic rocks .................................. 1. Generalized geologic map of the Port Valdez gold district, shc owing approximate locations of Individual mines.. ............. i. Ros4 e diagrams showing orientation and percentage of fluidi nc alusion occurrences for mineralized quartz veins and bedding f 0 . -. liation for mines in the Port Valdez gold district... ......... 56. ulagram showing fluid-inclusion filling temp !s in metamorphic-segregation- and mineralized-quartz ample^ from the Port Valdez gold district .................................. 57. Map of the Prince William Sound region, showing bohndarfes of the Sel uard and Cordova quadrangles and Chugach National Forest and aPl lroximate locations of selected geographic areas.............. I. Ske tch map of the Mount Hayes quadrangle, showing selected get >chemically anomalous areas north of the Denali fault....,..,. showin g sampl verse routes on Triden ;us i tna aciers, Mount quadrangle..... ...... .............. e-tra' lit ies ,....a-, def orml era t urc -vein s ....... Hayes Page
Page 1 and 2: n Alas Accompli: ' I.S. GE OLOGI CA
Page 3 and 4: I CONTENTS Page A bst raet ........
Page 5: -- --A I ALASEU i nued rral expluru
Page 9 and 10: . , ".,k a. ,.e ,\a 1 y U11 IIIUUII
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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