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- W302651132 abstract "Field characteristics, petrography, and geochemistry of granitoids associated with major W skarn deposits in the Cordillera have been examined to determine magmatic processes or parameters critical for mineralization. Approximately 30 W-bearing systems were examined as well some barren or Mo-related granitoids of similar age. Granitoids which are nearly devoid of Ti-bearing phases such as sphene, ilmenite, and titanomagnetite and exhibit a low Fe/sup +3//Fe/sup +2/ ratio in biotite appear to be correlated with higher grade deposits. Incorporation of W in Ti sites in these minerals may occur early in the crystallization sequence and reduce the amount of W available for incorporation into a magmatic aqueous phase and subsequent ore fluid. Mesozoic granitoids west of the Sr/sub i/ = .708 line in Nevada and California are also correlated with larger W deposits compared to granitoids east of that line. Possibly, assimilation or melting of some pelitic sediment versus assimilation of Precambrian crust during petrogenesis may alter fO/sub 2/ and volatile fugacities sufficient to account for these differences in granitoid mineralogy and W mineralization. Two end-member processes of fluid transport were noted in the granitoids examined. First, moderate albitization and myrmekite development may mark the path of interstial transport of the magmaticmore » component of the ore fluid through proximal ore-related granitoids. Alternatively, transport occurs via quartz veins through a proximal granitoid with magmatic ore fluids originating from a younger source intrusion removed some distance from the skarn.« less" @default.
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- W302651132 date "1985-01-01" @default.
- W302651132 modified "2023-09-26" @default.
- W302651132 title "Characterization of granitoid rocks associated with tungsten skarn deposits of the North American Cordillera" @default.
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