USGS Professional Paper 1697 - Alaska Resources Library

Verkhoyansk granite belt, which intrudes the Kolyma-Omolon
superterrane and the North Asian Craton Margin and are interpreted
as forming during regional metamorphism and anatectic
granitic plutonism associated with accretion of Kolyma-Omolon
superterrane onto the North Asian Craton Margin. (5) In
the Russian Northeast, continuing on from the Late Jurassic,
were (a) the Oloy (OL) belt, which contains granitic-magmatism-related
deposits and is hosted in the Oloy island arc, (b)
the Tamvatney-Mainits (TAM) belt, which contains podiform
Cr deposits and is hosted in zoned mafic-ultramafic plutons,
and (c) the Mainits (MA) belt, which contains kuroko massive
sulfide deposits. In the Canadian Cordillera, also continuing
on from the Late Jurassic, was the Cariboo (CB) belt of Au
quartz vein deposits. (6) Also in the Russian Northeast was
the Left Omolon (LO) belt, which contains porphyry Mo-Cu,
Mo-Cu skarn deposits and is hosted in the the Oloy island arc.
(7) In southeastern Alaska and the southern Canadian Cordillera
are two metallogenic belts that formed during granitic
plutonism that formed the Gravina island arc on the Wrangellia
superterrane. These belts are the (a) the western-south-
oa
Overlap assemblages (Cretaceous and
Cenozoic), and undivided terranes
OVERLAPPING MIDDLE AND LATE TERTIARY MAGMATIC
ARCS; EMPLACED ACROSS ALL MAJOR TERRANES
Middle and Late Tertiary back-arc units
EXPLANATION
OVERLAPPING CRETACEOUS AND EARLY TERTIARY MAGMATIC
ARCS; EMPLACED ACROSS ALL MAJOR TERRANES
es East Sikhote-Alin; ko Khingan-Okhotsk;
oc Okhotsk-Chukotka
OVERLAPPING MIDDLE JURASSIC AND EARLY CRETACEOUS
MAGMATIC ARCS AND FORE-ARC AND BACK-ARC BASINS;
EMPLACED ACROSS KOLYMA-OMOLON SUPERTERRANE
AD
AM
CA
KK
LE
LS
MT
MU
al Aleutian; ej East Japan; ka Kamchatka;
ku Kuril (includes east, central, western parts)
bs, Bering Strait; kr Kuril; sj Sea of Japan
kk Kamchatka-Koryak; km Kuskokwim Mountains
io Indigirka-Oloy
OVERLAPPING JURASSIC ONTINENTAL-MARGIN ARC AND
BACK-ARC BASIN; EMPLACED ACROSS NSS
ud Uda; uo Umlekan-Ogodzhin
CONTACTS AND FAULTS
Contact
Active subduction zone
Thrust fault
Major mid-Cretaceous and younger
strike-slip transform faults
FAULT NAMES
Adycha-Taryn thrust fault
Amur fault
Central Sikhote-Alin fault
Kuril-Kamchatka megathrust
Lena thrust fault
Lyakhov-South Anyui fault
Myatis thrust fault
Mongol-Okhotsk strike-slip fault
Figure 61.—Continued.
Early Cretaceous Metallogenic Belts (144 to 120 Ma; figs. 61, 62) 137
eastern Alaska (WSE) belt, which contains granitic-magmatism-related
deposits, and (b) the Britannia belt that contains
Kuroko massive sulfide deposits. In the below descriptions
of metallogenic belts, a few of the noteable or signficant lode
deposits (table 4) are described for each belt.
Metallogenic-Tectonic Model for Early
Cretaceous (144 to 120 Ma; fig. 63)
During the Early Cretaceous (Neocomian—144 to 120
Ma), the major metallogenic-tectonic events were (fig. 63;
table 3) (1) completion of accretion of the Bureya superterrane
against the North Asian Craton along the Mongol-Okhotsk
suture and formation of associated metallogenic belts, (2)
continuation of the continental margin and island arcs, and formation
of associated metallogenic belts and companion subduction-zone
assemblages around the Circum-North Pacific,
(3) accretion of the major Kolyma-Omolon superterrane and
formation of associated metallogenic belts in the Russian
JURASSIC AND CRETACEOUS ISLAND-ARC TERRANES
AL Alazeya; IR Iruneisky; KE Kema;
KM Kony-Murgal; KRO Kronotskiy;
KH Khetachan; KY Koyukuk; MAI Mainitskiy;
NE Nemuro; NU Nutesyn; OKA Olyutorka-Kamchatka;
OL Oloy; SB Stolbovskoy; WP West Pekul’ney;
YA Yarakvaam
JURASSIC, CRETACEOUS, AND EARLY TERTIARY
ACCRETIONARY-WEDGE AND SUBDUCTION-ZONE TERRANES
Dominantly oceanic rocks
AC Aluchin; AG Angayucham; AGR Argatas;
ANV Aniva; BD Badzhal; EK Ekonay; GL Galam;
HI Hidaka; KK Kamuikotan; NAB Navilsky;
PA Penzhina-Anadyr; PK Pekul’ney; RO Rassokha;
SA South Anyui; SMA Samarka;
TD Tukuringra-Dzhagdi; TO Tokoro; TU Taukha;
VE Velmay; VT Vetlovskiy
Dominantly turbidites
AM Amur River; AV Alkatvaam;
KUK Kuril-Kamchatka; PW Prince William;
TL Talovskiy; UL Ulban
CLASTIC SEDIMENTARY BASINS
(J, Jurassic; K, Cretaceous, T, Tertiary)
ar Anadyr (T); bu Bureya (JK); kb Kuibiveem (K);
rc Raucha (JK); ua Upper Amur (J)
CRATON, CRATON MARGIN, AND PASSIVE
CONTINENTAL-MARGIN TERRANES
NSC North Asian Craton;
NSC, NSS,
NSS North Asian Craton - Stanovoy Block;
NSV, KN
NSV North Asian Craton Margin; KN Kular-Nera
ma
no
wvk
om
GRANITE BELTS
Main part, collisional granite belt
Northern collisional granite belt
West Verkhoyansk collisional granite belt
Omineca-Selwyn collisional granite belt
OCEANIC UNITS
PAC Pacific oceanic
plate
METALLOGENIC BELTS
TO