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

(SK) metallogenic btlt which contains Au-quartz vein deposits. In the same region is the Kondyor (KO) medlagenic bell which
contains mnsd mafic-ultramafic Cr-PGE deposits and is hosted in zoned mafic-ultramafic intrusions intruding Slanovoy block ~f
Figme 62. Generalized map of major Early Cretaceous metallogenic belts and overlap assemblages for Alaska, Canadian
Cordillera, and adjaoent afkihore areas. Refer to text for description of metallogenic belts. Adapted from Ngldeberg and dtmm
(1 OWb, 1998).
the Nod Asim Ciaton. Also in the same region is the Algama (AL) metallogenic belt which contain8 stntifonn Zr dep~sirs These
two mktdogenic bdt are interpreted as forming during plutonic intrusion related to continental-margin tra~sfom faults whe~Qe
margin of the North Asian Cmon was being deformed during collision and accretion of outboard tcrrmes.
(4) The conlinend-margin Uda arc (Uda volcanic-plutonic belt, ud, and Uda-Zeya sedimentary bash, uz) canhued to
form. Associated wikb the arc was subduction and sinistral transpression of the final remnant of the Mongol-Okholsk Ocean plate,
thereby forming the Ulbas (UL) hrrane. Sinistral transpression continued along the Mongol-Okhotsk suture (MO).
(5) The extensive Kony-Murgal continental-margin and island arc and Pekulney island arc cwtinued to h. Associated
with thbee arcs was suMnction of part of the ancestral Pacific Ocean plate to form the Talovskiy (TL), Penzhinn-Anadyr (PA), and
Pehhey (PK) terranea
(6) Behind the buy-Murgal arc, the Kolyma-Omolon superterrane (KLO) was accreted between at about 140 to IOOMa
During the early stage of accretion, the Main collisional granite belt (ma; 144 to 134 Ma) formed (Layer and others, 1995; Fujita
and others, 1997). At about the final stage of accretion, the subduction-related Northern granite belt (no) f a d st about 127 to ,
120 Ma (Fujita d others, 1997). In contrast to the Main granite belt, the coeval Northern granite belt is inkrpreted BF f&g m
response to subduction related to closure of an inlet of the South Anyui Ocean. As a result, the northern bend ufrhe K~lyma-
Ornotan structural loop formed (Sengor and Natal'in, 1996a). As a continuation of the structural loop, the wttensSwnl Transverse
gratllk belt (tr) fonned (Parfenov, 1995~). Associated with accretion of the Kolyma-Omolon superterrane (KLO) and intrusion of
anetectic $ranites were formation of the Allakh-Yun (AY), Darpir (DP), Kular (KU), Shamanikha (SH), Tompon (TO),
Verkhoyamk (VK), Yano-Kolyma (YA), and Yana-Polousnen (YP) metallogenic belts which contain a kpe suite of Au quartz
vein and granitic-mapath-related deposits.
(7) The Oloy island arc and the opposing Nutesyn and Koyukuk island arcs continued to be active on tbc oppwiie sick
dlhe Swlh Anyui and Angapcham Oceans. Forming in the Oloy arc were the Oloy (OL) and Lte flolon (LO) mU?ib@