Bedrock geologic map of the eastern Denali Highway area, Mount Hayes, Healy, and Talkeetna Mountains quadrangles, Alaska
Description
Report of Investigation 2020-7, Bedrock geologic map of the eastern Denali Highway area, Mount Hayes, Healy, and Talkeetna Mountains quadrangles, Alaska, presents interpreted bedrock geology for a portion of the northeastern Talkeetna Mountains and the eastern Alaska Range that is primarily underlain by Pennsylvanian through Triassic rocks of the Wrangellia terrane, plus structurally emplaced Jurassic through Cretaceous metasedimentary rocks that formed north and east of Wrangellia prior to its accretion to North America. It provides the geologic framework for known and potential mineral resources related to the geology of Wrangellia, including magmatic nickel-copper-cobalt-platinum group element deposits hosted by Late Triassic mafic and ultramafic intrusions, copper-silver deposits related to metamorphism of the Late Triassic Nikolai Greenstone, and copper-gold skarn deposits associated with Early Cretaceous plutonism. This map synthesizes and reinterprets multiple generations of geologic maps, geophysical surveys, geochemistry, and geochronology, plus incorporates targeted field observations by geologists from the Alaska Division of Geological & Geophysical Surveys, the University of Alaska, and the University of California, Davis. Additional discussion of the geology and mineral potential of the map area is presented in a companion report, Twelker and others (2020). The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/30469.
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https://doi.org/10.14509/30469
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https://doi.org/10.14509/30469
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https://doi.org/10.14509/29470
Tags
grogg creek
norian
paleozoic
phelan creek
no good lake
gems
maclaren terrane
magnetite
greenstone
basalt
siltstone
susitna river
mccallum glacier
chistochina mining district
clearwater creek
gems ncgmp09
crystal lakes
oxbow lake
rusty lake
lake creek
butte creek
raft creek
strelna formation
rocks
glacier gap
plutons
amphitheater mountains
cabin creek
spray creek
geochronology
strelna terrane
batholith
clear creek
pass creek
swampbuggy lake
clearwater mountains
metamorphic minerals
granite
glaser lake
swede lake
eldorado creek
miller mine
osar creek
broxson gulch
cretaceous
ultramafic
downwind lake
two plate creek
wildhorse creek
roosevelt lake
wickersham creek
roosevelt creek
quaternary
conglomerate
gulkana river
petrokov lake
maclaren glacier
phalarope lake
sillimanite
permian
minerals
staurolite
pass lake
summit lake
faults
big rusty creek
geologic
coal creek
coal lake
corkscrew creek
eocene
volcanic
tertiary
bedrock
specimen creek
greenschist
cottonwood creek
gunn creek
moose lakes
graphite
geology
metamorphic
delta river mining district
dggs
mud lake
fish lake
plutonic hosted
fourteenmile lake
shale
sedimentary rocks
skarn
platinum
jurassic
hatchet lake
strategic minerals
geologic map
volcaniclastics
rusty creek
landmark gap lake
correlation
eureka creek
waterfall creek
geochemistry
tenas lake
eureka glacier
sevenmile lake
gold
cathedral creek
snodgrass lake
valdez creek mining district
hornblende
rainbow mountain
copper
hidden lake
windy creek
seventeen mile lake
plutonic rocks
rock creek
devonian
paxson mountain
metaigneous units
paxson
silver
wrangellia terrane
maclaren glacier metamorphic belt
oligocene
alpine creek
tuff
nikolai greenstone
grogg lake
sandstone
metavolcanic rocks
metamorphism
pennsylvanian
unconformity
strategic and critical minerals assessment project