Metallogenesis and Tectonics of the Russian Far East, Alaska, and ...

EXPLANATION
ORATOr(
DMh&dy oceavaie roc*%
AGhgquchem; ACN-; WAha:
Nscm~Crrrn
ltae Aaan C ~ W- -oy I
NorthAsi&-tCrolonlUergR
(VsrhhOya~'& kid ard UUUSI belt)
block
ARG Arpbs; BD 6adzhah D8 Debin; EK Ekonay;
GB G-a; GL Galam; Cn Hldaka; IN Ind~g~rka:
KK Karnuilrotan: KYB K m ; MU Mun~Ycan:
NAB Nabitsky; NS NoraSukMh
PA PemhinaAnadyr. F'K Pekubwy;
SA Soulh Anyui: SMA Sarnarlur:
CRATWTERRAMS
TD Tukwingre-Wmgdi:
TO Tokoro; TU T d ; UY Uyandb;
AK Avdrm: AU Arg*r: BL Wadek: VE V w , YT Ve(lovskiy
~ ~ C X 0 ~ : O Y ~ l o n Dominenlly fiuW&es.'
AMArrYSRVWAV-
mSSNE CMCFTNWTAL- TERRAWES KUK Kur-lka:
pwpd-RA-;
AA Axttc Alaska: AY Aymsk; CH Chukotka; SY So~lchi-Y-,
KN W-Nera: 00 W: QV hulevka: TL T a W i UL Ulban;
4 P-S: VL M I WK West Kamcba(ka
METAMO- UMTWNTALdMRGIN TERRANES
- ACCM~EDTERRANES PAC Pacilic oceanic plate
mntakmam erc hmm Contad
Actwe subduction zone
,ta,logmic
- AAAh m m
0s'
ALAlareyP: R m y : KM Karwrgd:
-~MI(IIII*mKYKoyuRuk:
U) bd+Grodekorsk; M4I m v .
ME Elanws: NU Nulesyn: OKA Oiyulorks-
Kanchafka: OL Oby: 98 SWbovskay;
3H Shrn~dt: TR -: HR MI PektAey:
YA Y-
Metallogenic Belts Formed During
Proterozoic Rifting of North Asian Craton
or Craton Margin
Oroek Metallogenic Belt of ironstone and
Sediment-Hosted Cu Deposits (Belt OK)
West-Central Part of Russian Northeast
BE Beryozovka: LN Len: SY SorrcM-Ye~o;
UB Uniya-Bm: WSA W WhM:
ZT Zhuravlesk-Tunnh
The Oroek metallogenic belt of ironstone and sediment-hosted Cu deposits (fig. 2; tables 3,4)occurs mainly in the
Shamaulikha River basin in the central part of tbe Russian Northeast (Shpikerman, 1998). The belt is hosted in the Shamanikha
subterrane of the Prikdyma passive continental margin terrane of the Kolyma-Omolon superterrane (Noklebag d others, 1994c,
1997~). The belt trends north-south for 400 km along the axis of the Prikolyma terrane and has a maximum width of 100 km. The
ironsione deposits occur in the Late Proterozoic Spiridon and Gorbunov Formations. The significant deposits are at P&eda and
Oroek (Nokleberg and others 1997a, b, 1998). The Oroek metallogenic belt is herein interpreted as a faulted fragment of the
Bilyakchan metallogenic belt, described below, which is hosted in the North Asian Craton Margin (Verkhoyansk fold belt, unit
NSV).
Pobeda Ironstone Deposlt
One part of the Pobeda ironstone deposit (fig. 4) occurs in the Spiridon Formation consists of stratiform hematite (Z.G.
Potapova, written commun., 1954; A.G. Kats, written commun., 1979) and is interpreted as a fossil littoral zircon-titanium-
magnetite placer deposit. The other part of the deposit occurs in Late Proterozoic dolomitic marble of the Gorbunov Formation in
a zone of imbricated thrust faults. This part of the deposit consists of gabbro and gabbro-amphibolite bodies and with hematite
masses which occur along thrust fault planes. The deposit contains massive, brecciated, and stockwork ores. Massive ores contain