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

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metamorphism associated wilh extension which occurred after overthrusting of Angayucham subduction zone lenane. (6) In tke
dtrn Canadim CordiIkra, the Fish River (FR) metallogenic belt, which contains stratabound sedirncPtary P and Fe depbsits
and is hbated hp the Nod American Cra(oo Margin, is interpreted as forming during Late Mesozoic, dexh-al movement along the
bltag-Parcupine fault syatun. (7) In the Canadian Cordillera, continuing on from the Early Cretaceous was the WOS~~~P-
Southw~cm AQska (WSE) belt, which contains granitic-magmatism-related deposits which art bsted in the Grrrvina-Nutmtin-
Qditr belt whictb ovdies the Wmgellia superterrane. And (8) also in the Canadian Cordillera, he Bayomc (BA), C&ar
(CAI, Selwyn (SW), Tombslane (TS), and Whitehorse (WH) belts, which contain granitic-magmatimrelat6d deposits, areaka
hosted in or near anatectic granitic plutons of the Omineca-Selwyn plutonic belt which is interpreted as foming during find
aecrehn of Wrangellia superterrane to North American continental margin. In the below descriptions of metaJlo$@nk kk, a few
of the mteable or signficant lode deposits (table 4) are described for each belt.
Melalkgenic-Tectonic Model for
Late t rly Cretaceous (120 to 100 Ma;
Fleun, 72)
During the late Early Cretaceous (Aptian through Albian - 120 to 100 Ma), the major metallog&-Ulanie even& were
(table 3): (1) inception of the short-lived Khinghan continental margin arc, and formation of eaciaked metalbganic MLI and
coropenion subdudon zwe in (he Russian Southeast; (2) accretion of the Mainitskiy island arc and asfociated AbWaolll (AV)
xdaary-wudge tmanes to the active continental margin; (3) completion of accretion of the majar Kolyma-Omalm
supatenme ia the Russian Norhast and fmation of associated metallogenic belts; (4) abduction of Anpyuchm subth~h-
zone terrane onto the Arctic Alaska terrane and formation of metallogenic belts during extension which succeeded obd~cri- (5)
I continued opening of the Arnerasia, Canada, and Eurasia Basins; and (6) continuation of the Gravina rrc and fmmsaien of
associated metallogenic belts during continuing accretion of the Wrangellia superterrane, and inception of mllisio~ehtad
I metallogenic belts.
Figure 72. Late Early Cretaceous (Aptian through Albian - 120 to 100 Ma) stage of metallogenic-tectonic mobel. Refer to text for
explanation of metallogeniotectonic events, to tables 3 and 4 for descriptions metallogenic belts and s ignW deposits, and to
figure 18 for explanation of abbreviations, symbols, and patterns. Adapted from Nokleberg and others (1997b, $988, 2M)O).'