n Alas - Alaska Division of Geological & Geophysical Surveys - State ...
n Alas - Alaska Division of Geological & Geophysical Surveys - State ... n Alas - Alaska Division of Geological & Geophysical Surveys - State ...
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,
. ,<br />
".,k a. ,.e ,\a 1 y U11 IIIUUII LU l llY . . . . . . . . . . . . . . . r r r . . . . . . . . . . . . . . . . . . . . . 3 2<br />
Selected trace-element geochemistry <strong>of</strong> altered rocks from<br />
Sunrise dome... .................................................. 3 3<br />
Ages <strong>of</strong> radiolarians from Rampart distriot chert looallties....... 4 2<br />
Uranium-lead isotopic data and ages for detrital zircons,<br />
Yukon-Tanana Upland .....................,,.,...........4.m,..... 4 4<br />
Major-element data for sillimanite gneiss from the Big Delta<br />
quadrangle ........................................................ 4 6<br />
Uranium-lead isotopic data and ages tor stllimanite gneiss<br />
and granite from the Big Delta quadrangle ....................... 4 7<br />
Modal analyses <strong>of</strong> samples from the Big Delta quadrangle ........... 5 1<br />
Trace-element data for samples from the Big Delta quadrangle ...... 5 2<br />
Electron-microprobe analyses <strong>of</strong> pyroxene and garnet from<br />
metamorphic rocks along the Pinnell Mountain trail .............. 5 6<br />
Electron-microprobe analyses <strong>of</strong> minerals In eclogite sample,<br />
Circle quadrangle ............................................... 5 8<br />
General petrography <strong>of</strong> major rock units in the Pingston<br />
terrane, eastern <strong>Alas</strong>ka Range ................................... 7 3<br />
Uranium-lead isotopic data and ages <strong>of</strong> zircons from the<br />
Pingston terrane ................................................. 7 4<br />
Potassium-argon ages <strong>of</strong> voloanic rocks from the Matanuska<br />
Valley and the southern Telkeetna Mountains................ ..... 8 4<br />
Strontium-isotopic analyses and selected chemical data for<br />
volcanic rocks from the Matanuska Valley ........................ 8 5<br />
Five-factor R-mode factor analysis <strong>of</strong> stream-sediment sample<br />
data, Cordova quadrangle ...... ;............................,.,,, Q 1<br />
Four-factor R-mode factor analysis <strong>of</strong> stream-sediment sample<br />
data, Seward quadrangle ......................................... 91<br />
Paleomegnetic data <strong>of</strong> Gravina-Nutzotln belt rocks on Marsh<br />
Island. .......................................,.........,,,,..., 119<br />
Mean paleomagnetlc data on four Gravina-Nutzotin belt beds on<br />
Marsh Island. ................................................ 119
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