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The mineral chemistry of pyroxenite xenoliths in the volcanic rocks of Hoh Xil and their significance
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The mineral chemistry of pyroxenite xenoliths in the volcanic rocks of Hoh Xil and their significance
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Journal Article
The mineral chemistry of pyroxenite xenoliths in the volcanic rocks of Hoh Xil and their significance
2001
Overview
The pyroxenite xenoliths in the volcanic rocks of Hoh Xil consist of clinopyroxenes and orthopyroxenes. The mineral composition of these pyroxenes is similar to that of mantle xenoliths including peridotite and pyroxenite from China and abroad, and different from that of granulites. The pyroxenes formed at 1101–1400°C (averaging 1250°C) and under 30–60 kb (averaging 46 kb). We deduced that the magma was derived from the mantle at a depth of more than 150 km, which fits in with the geophysical conclusion that the low-velocity layer existed in the mantle under 150 km.
