85SK 175B
Baird Mountains
Granite
Zircon
Karl and Aleinikoff, 1990
Killarichuk Hills, western Brooks range
N
W
(-100+150) diamagnetic zircon
No
(-100+150) magnetic zircon
(100+150) diamagnetic abraded zircon
(-250) nonmagnetic zircon
77Dn76
Ambler River
Schist
Dillon et al, 1979, 1980, Hitzman et al, 1982, 1986, Mayfield et al, 1983
Duplicate sample 77Mw76, Arctic prospect
magnetic separate
no
77Mw76
Duplicate sample 77Dn76, Arctic prospect
diamagnetic separate
77Dn72a
Wiseman
Dillon et al, 1979, 1980
Possibly a metatuff
77Dn72b
77Dn72c
Dillon et al, 1980
77Dn102a
Gneiss
Sixtymile River, granite orthogneiss
77Dn102b
77Dn102c
77Dn217c
Granite orthogneiss, Ernie Lake
77Dn217a
Ernie Lake, granite orthogneiss
77Dn217b
60ATr134
Mayfield et al, 1983
Meta-granite
84APa11
Survey Pass
Arth and Stern, written communication, 1986
Mt. Igikpak, granite and granite gneiss
84APa13
90TM 409
Dacite
Aleinikoff and others, 1993; Till and others, in press
Dacite porphyry; weighted intercept of Pb/Pb ages.
90TM 497
Porphyry
Plagioclase porphyry
87ATi 70A
Orthogneiss
Till and others, in press
Granitic orthogneiss
77Dn43
Dillon et al, 1979, 1980; Till and others, in press
Wild River
88TM 137
Estimated maximum age
77Dn74M
Dillon et al, 1979, 1980, Nelson and Grybeck, 1980; Till and others, in press
Monzonite orthogneiss
77Dn74D
206Pb/238U, 207Pb/235U, 207Pb/206Pb dates, diamagnetic separate
90ANK 12
Chandalar
Compsite of zircon and monazite dates; reported as at least 381 Ma based on monazite and no more than 398 Ma based on zircon.  Data is discordant and no concordia intercept could be calculated.
93-JT-88
Toro and others, 2002; Till and others, in press
Range of ages, 375 to 395 reported, no error reported
90TM 408
Hornblende-biotite granite gneiss.  Weighted average of 206Pb/238U ages
n.a.
Metarhyolite
McClelland and others, 2006; Till and others, in press
Sun/Picnic Creek prospect
Tom prospect
Raterman and others, 2006; Till and others, in press
Arctic deposit
90TM 498
Hornblende-biotite granite gneiss.  Weighted average; interpreted age
Karl and Aleinikoff, 1990; Till and others, in press
Killarichuk Hills, western Brooks Range.  Alkali feldspar granite
(+100) diamagnetic, abraded zircon
W-1
78Md 120 (MtAngay)
Granodiorite
Karl et al, 1989, Till, 1989; Till and others, in press
Intrusive age, Mt. Angayukaqsraq.
85Dn 24
Karl and others, 1989; Till and others, in press
Till and others (in pres) report rock type as Alkali feldspar granite
Fault lense