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Tectonic breccias--conduits for ore-bearing and metasomatic fluids in the Jabiluka unconformity-type uranium-gold deposit, Northern Territory, Australia

Conference · · Geol. Soc. Am., Abstr. Programs; (United States)
OSTI ID:6330310
;
The distribution of strata-bound uranium ore in the highly chloritized Early Proterozoic metasedimentary rocks at Jabiluka, Australia, is controlled by shear zones associated with repeated episodes of brittle deformation. Based on extensive study of drill-hole core, the authors proposed tectonic control of ore distribution contrasts with most previous Jabiluka models that emphasize carbonate solution and collapse as the primary cause of brecciation. The strata-bound character of the ore, which is predominantly in chlorite, chlorite+graphite, and siliceous breccias, is a function of the susceptibility of specific rock types to shear and fracture. The siliceous breccias, which may in part be preferentially brecciated and silicified magnesite and dolomite, commonly contain fragments of sheared and strained quartz in recrystallized quartz matrix. Mineralized schist fragments and broken uraninite veins in breccias indicate that some of the brecciation occurred after a major mineralizing event. Brecciated zones and fractures are cemented and filled by quartz and by Mg-rich chlorite and 7A amesite. The presence of at least three generations of quartz in siliceous breccias and a number of optically, and in some cases chemically, distinguishable chlorites in chlorite breccias indicates that repeated pulses of fluids moved through the broken rocks. The circulation of these fluids redistributed and possibly further concentrated preexisting ore.
Research Organization:
Geological Survey, Denver, CO (USA)
OSTI ID:
6330310
Report Number(s):
CONF-8510489-
Conference Information:
Journal Name: Geol. Soc. Am., Abstr. Programs; (United States) Journal Volume: 17
Country of Publication:
United States
Language:
English

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GEOLOGIC MODELS
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MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
METAMORPHIC ROCKS
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