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

Figure 101 8. Ke~ecolt &4W d KemwaIt Cu depW&, &?Ountrrlns flmb3l- b3& Piouthem Alaska. Schematic cross
section through Bonen~%M# Lade am am&. ShaW mW Wa#W&Ms tb%xbnt d CI;ClfCk Wns and local massive sulfide
bodies. Plane of section k N 33 L MapW fmfl'b- a d O@fW$ f f Qn).
Origin of and Tedonic ConObkr Ibr
Wrangell Mountains MsWhpwtk? M
Througkut &I Nk~lli Gream and older rocks in the Wrangettja tamme, quark dm, a&i&kdlyQgwEain
abundant Cu sulfidde, grn& in40 cbk ofquartz, chbfite, actindt~, ad epidoPe @low&& oth&!& IW5j I-. This
relation suggests that the CwAg q u a vein deposits f6nnd.m a period of lower ~~ fsljes
The age of rnetamorpbign Is interprdkd 8s & r e - Ehdy htamaw md ddsr&Wa of
were affected. The form~etiw nfh Cu-A9 q@rt~ vein &yo& andiiiwx
occurring during mid-Cre~e9t.u WXT&UI t&l of th W m
Cordillera (Nokleberg and m,
1*5, m, Petlad 1RQ _
The Kennecott Cu depm~fn am -by lbwtllWg #mid tdh&bveS (fB%%] tttkd
forming by derivation of Cu frwo tbc Nkolsrj m- %hW& by depmition WcygBiWd~
of the overlying Chitistwo L i m alerag (bhdti~ hit&&m, and as fib@
MacKevett (1 982) interpreted Ihs aj~? of dqmition as Late Ti'bsiE, but did not mb out pm&Me h&r ~
Subsequently, Mac
Cu-Ag quartz vein
In contrast, Nokleberg
metamorphism of the Nikbhi G ~W~~~IYQ, sssocisZed with
t k m
been the source of hydr~thamal hid^
in the Kemicott district &d
&tb'&p&6d
ih d td
Late Cretaceous and
Early Tertiary Metallogenic Beb
(84 to 52 Ma) (Figures 102,103)
Overview
-4 vafb -IS SWhnl ~hSkSL 4
The major Late Cretaceous md early Tertiary metallogenic belts in the Rush Far East, Ah&, md tk0 Cansdian
Cordillera are summarized in table 3 and portrayed on figures t02 and 103. i%e major belts are 6s foil ow^. (1) In &a Russian
Southeast, continuing on from he early Late C~O~ZIWW were tk ~III~ (m), ~ Wh~ W (LA), hd&h&y CLZ), mka
(SG), and Taukha (TK) belts, which cantain a lsvge array of granitic-magmahm-rnW deposits. The belts ape hosted in ar ~taar
the East Sikhote-Aline vo~~c-plutonic belt and are interpreted as fohg during subduction-rebkd &tic plutmism W
formed the East Sikhore-Aline contineaid margin arc. (2) Irl the Russian Now& contiatling frem & early Lgtc C-ous st%
several zones of the Eastern Asia be& along with formation of gtvd new zones. 'I'ho zontS, which wed in ot rn b