Discovery of mantle and lower crust xenoliths from early Cretaceous volcanic rocks of southwestern Tianshan, Xinjiang |
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Authors: | Baofu Han Xuechao Wang Guoqi He Tairan Wu Maosong Li Yulin Liu Shiguang Wang |
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Institution: | (1) Department of Geology, Peking University, 100871 Beijing, China |
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Abstract: | In Tuoyun area of southwestern Tianshan, mantle and lower crust xenoliths are present in the volcanic rocks with ages of 101–123
Ma. Mantle xenoliths include mineral megacrysts such as kaersutite and pargasite, feldspar, biotite, and rare pyroxene and
rock fragments such as perodotite, pyroxenite, amphibolite, and rare glimmerite. Lower crust xeno-liths are mainly banded
and massive granulite. The volcanic rocks were produced by within-plate magmatism. Occurrence of hydrous and volatile mineral
megacrysts, amphibolite, and some pyroxenite containing hydrous and volatile minerals indicates that mantle metasomatism was
intense. Undoubtedly, this discovery is very important to understanding of the crust-mantle structure and geodynamic background
in depth in southwestern Tianshan and geological correlation with adjacent regions. |
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Keywords: | mantle lower crust xenolith megacryst volcanic rock southwestern Tianshan |
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