Fractals - Geomathematics: Theoretical Foundations, Applications and Future Developments - page 392

Fig. 10.17 Regional
geology map of the Iskut
River area according to
Anderson ( 1993 ) (Source:
Cheng et al. 1996 , Fig. 7)
predominantly hydrothermal types havebeendocumented(B.C.MinfileMap
104B, 1989; Anderson 1993 ). The area is underlain by Paleozoic and Mesozoic
sedimentary, volcanic and plutonic rocks and has been subjected to low-grade
regional metamorphism, heterogeneous penetrative deformation and complex
fault history. Paleozoic sedimentary and volcanic rocks are mainly exposed in
the central and western parts of the NTS 104B map sheet. Major rock types
include greenstones, limestones, shales and clastic sedimentary rocks. Mesozoic
assemblages are divided into three major groups (Anderson 1993 ): (1) Upper
Triassic Stuhini group (volcanic and clastic sedimentary sequences); (2) Lower
and Middle Jurassic Hazelton Group (volcanic and clastic sedimentary
sequences); (3) Middle and Upper Jurassic Bowser Lake group (clastic sedimen-
tary sequences) which outcrop mainly in the northeastern parts of the map sheet.
Paleozoic and early Mesozoic rocks (up to Middle Jurassic) were intruded during
two episodes of magmatism. Late Triassic plutonic rocks consist of I-type horn-
blende-biotite metadiorite, quartz monzonite and monzodiorite. Early Jurassic
plutonic activity was characterized in the southwestern parts of NTS 104B
by biotite-hornblende granodiorite and quartz monzodiorite intrusions. In the
northeastern area alkali-feldspar-rich, biotite- or hornblende-rich syenite, quartz
monzonite and alkali-feldspar porphyry intrusions predominate. Stockwork
vein-type epithermal precious-metal mineralization and mesothermal base- and