Discovery of mantle and lower crust xenoliths from early Cretaceous volcanic rocks of southwestern Tianshan, Xinjiang

被引：13

作者：

Han, BF ^{[1
]}

Wang, XC ^{[1
]}

He, GQ ^{[1
]}

Wu, TR ^{[1
]}

Li, MS ^{[1
]}

Liu, YL ^{[1
]}

Wang, SG ^{[1
]}

机构：

[1] Peking Univ, Dept Geol, Beijing 100871, Peoples R China

来源：

CHINESE SCIENCE BULLETIN | 1999年 / 44卷 / 12期

关键词：

mantle; lower crust; xenolith; megacryst; volcanic rock; southwestern Tianshan;

D O I：

10.1007/BF02886139

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 xenoliths 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.

引用

页码：1119 / 1123

页数：5

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