USGS Professional Paper 1697 - Alaska Resources Library

to Albian pelecypods (Nokleberg and others, 1994c). The
volcanic rocks range between from tholeiitic and calc-alkalic.
In the Kema metallogenic belt, the volcanic rocks are mostly
intermediate and moderately felsic, mainly rhyolite and lesser
basalt with K-Ar ages of about 55 to 60 Ma. In contrast to the
nearby Taukiha metallogenic belt, the Kema metallogenic belt
contains mainly Ag-Au epithermal deposits and is hosted in
or near granitoid rocks of the East Sikhote-Alin belt where it
intrudes the Cretaceous island-arc rocks of the Kema terrane.
Luzhkinsky Metallogenic Belt of Sn Greisen, Sn
Polymetallic Vein, Sn Silica-Sulfide Vein, and
Porphyry Sn Deposits (Belt LZ), Southern Part of
Russian Southeast
The Luzhkinsky metallogenic belt of Sn greisen, Sn
polymetallic vein, and porphyry Sn deposits (fig. 79; tables
3, 4) occurs in the southern part of the Russian Southeast
(Gonevchuyk and Kokorin, 1998). The belt is hosted in the
Late Cretaceous and early Tertiary granitoid rocks of the
East Sikhote-Alin volcanic-plutonic belt, which intrude the
southern part of the Zhuravlesk-Tumnin turbidite basin terrane
(Nokleberg and others, 1994c, 1997c). The Luzhkinsky metallogenic
belt contains one of the major group of Sn mines in the
Russian Southeast (Vasilenko and others, 1986; Radkevich,
x x
Rhyolite
porphyry
Dacite
Granodiorite
porphyry
Sandstone
Siliceous
schist
Late Cretaceous
and early Tertiary
Late Jurassic and
Early Cretaceous
Early Late Cretaceous Metallogenic Belts (100 to 84 Ma; figs. 79, 80) 189
VI
Ore veins
Stockwork
1991; Gonevchuk and others, 1998). The significant deposits
in the belt are Sn silicate-sulfide vein deposits at Arsenyevsoe,
Khrustalnoe, and Vysokogorskoe (fig. 89), Sn polymetallic
vein deposits at Dalnetayozhnoe, Iskra (fig. 90), Nizhnee, and
Zimnee, a polymetallic vein deposit at Yuzhnoe, porphyry
Cu and porphyry Cu-Mo deposits at Lazurnoe, Malinovskoe,
Verkhnezolotoe, and Zarechnoe, porphyry Sn deposits at Yantarnoe
and Zvezdnoe, and Sn-W greisen deposits at Tigrinoe
and Zabytoe (table 4) (Nokleberg and others 1997a,b, 1998;
Gonevchuk and others, 1998).
Sn Greisen and Sn Polymetallic Vein Deposits
The Sn greisen and Sn polymetallic vein deposits of the
Luzhkinsky belt formed in the mid-Cretaceous and early Tertiary
between about 90 to 100 and 60 Ma (Gonevchuk and Korkorin,
1998). The older deposits formed in the early Late Cretaceous
(90 to 100 Ma) are typical Sn greisen deposits and are associated
with Li-F granitoid rocks. These Sn greisen deposits contain
notable amounts of W, as at the Tigrinoe deposit that occurs in the
eastern part of the metallogenic belt adjacent to the Samarka W
skarn accretionary metallogenic belt (fig. 79). Intermediate-age
deposits, formed in the late Late Cretaceous (75-85 Ma), are Sn
polymetallic vein deposits, as at Zimnee, which are interpreted
as forming in coeval andesite, monzodiorite, and granodiorite
intrusions. These Sn polymetallic vein deposits occur in the
western part of the Luzhkinsky metallogenic belt. The younger
0 40 m
Fault
Contact
Underground
level
0
I
II
III
IV
V
VI
VII
VIII
Figure 89. Vysokogorskoe Sn silicate-sulfide
vein deposit, Luzhkinsky metallogenic belt,
Russian Southeast. Schematic cross section.
Elevation 0 is sea level. Adapted from Gonevchuk
and others (1998). See figure 79 and table 4
for location.