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

(TC), and Toodoggone (TO) belts which contain granitic rnagmrliom-related @sits aad are interpreted ae formi% in the axid
parts of the Stikinia-Quesncllia island are. IR ~e fobwiung descriptions of mcrsaagtnic belts, a few of he mteoblt rig~frcfnt
lode depasits (table 4) are described for each belt.
Figure 42. Generalized map of major Early and Middle Junudic nW&qdc behs and for Akaska, anadian Cordillma, ~d
adjacent offshore areas. Refer to text for deauiplbn of meMsl)agbnic bslk Adaptad ~~~ ~ RU atha? fTm% @@F
to figure 3 for explanation.
Metallogenic-Tectonic Model for
Early Jurassic (208 to 193 Ma; Figure 43)
During the Early Jurassic (Hettangian to Pie-W - 208 lo 193 Ma), Ibe mjbf ~~tectoaiCa~cwtg were.
(fig. 43; table 3): (1) continuation of continantaf-mrgm
-
arcs a d d b d wbhctioP pbar tb NMb
-
Ash C- in the
Russian Far East; (2) beginning of assembly of pre~io~ly rifled cmlmd, passive QbbCibtPtal-W, W kbu4-an
--
%@rams
between which craton and the ancestral Pacik Ocean lo hm the KdymsOmlen Enptrramt; 0) +3cah&mdh
Talkeetna, Bonanza, and Stikinia-Quesnellia arcs md assoched metallogienic Mts, d fannatiw of c-awbdmh
zones; (4) continued sinistralslip
imbrication of the Stikinia-Quesnellia iralaed cootaimad.me- battr, tad associated
oblique-sinistral convergence between the ancestral hi5c Ch#a plate and tfrs Norrb herifan -P m&(q ~ilia thQ
beginning of accretion of the Stikinia-QutsnalEia arc at about 185 Mq Lbt stmt dawnaia wl&g in the AmmMn
Cordillera. Sedimentation continued along cBa p;buive contim&&l mvgh of no^ Asian md Narth Anmiam C-s.