Abstract
Electron microprobe analyses and physical and optical properties of six garnets from plutonic rocks of the composite concentrically-zoned Werner batholith show that the garnets are dominantly almandine (65-70 percent) with lesser amounts of spessartine ( 13-29 percent), pyrope (2-11 percent), and grossular (1-5.6 percent). Garnets from two contaminated facies (diorite and granodiorite) of the batholith are interpreted as xenocrysts derived from surrounding pelitic metasediments, while those from an aplite dike which intrudes the granodiorite are considered to be phenocrysts.
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