Cumulate Xenoliths in the Lodgepole, Enos Mountain and Susie Peak Intrusions: A Guide
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The Lodgepole, Enos Mountain and Susie Peak plutons represent multiple intrusions of intermediate magma that were emplaced at depths ranging from near-surface to 2 km during the Late Cretaceous....These intrusions lie, respectively, 8, 9 and 12 km north of the nearest outcrops of the Stillwater Complex. The Lodgepole intrusion is composed of an early, dacitic phase and a later, dioritic phase; the diorite contains abundant xenoliths (maximum 31 cm diameter) in the area north of Clover Basin near its west margin. These xenoliths include foliated mafic amphibolite, gneiss, Paleozoic sedimentary rocks and mafic cumulates. Smaller xenoliths of similar rock types are found in the Enos Mountain and Susie Peak intrusions....Mineral compositions and textures lead to the conclusion that the cumulate xenoliths were brought up from a buried underlying extension of the Stillwater Complex. Less
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Topics: Geology & the Dynamic Earth
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