Qiaoenbulak Gr
Type Locality and Naming
Aksu-Kalpin region. The Qiaoenbulak Gr was named by Zhang Tairong et al. in 1977 and formally published by Gao Zhenjia in the same year. The typical section is situated in Qiaoenbulak (south of Suogedantawu Mountain) in Wushi County and the reference section is on the south of Yourmeinak, Xinjiang Weiwuerzhu Zizhiqu (Xinjiang Uygur Autonomous Region).
Synonym: （乔恩布拉克群）
Lithology and Thickness
The Qiaoenbulak Gr is suite of deep-sea clastic rock, representing the deposit of turbidity flow of submarine fan. Based on lithology, the Qiaoenbulak Group is subdivided into four formations (Gao Zhenjia, 1993), in ascending order, the Xifangshan Fm, Dongqiaoenbulak Fm, Muyangtan Fm and Dongwu Fm. This formation is dominated by greenish gray feldspathic sandstone, lithic sandstone, siltstone, sandy conglomerate and conglomerate, with low-maturity, poorly sorted, single and persistent lithology, well-graded beds and incomplete Bouma sequences. The middle part shows coarse debris flows. The total thickness is 2000 m
Relationships and Distribution
Lower contact
The bottom is not seen.
Upper contact
It is disconformably overlain by the Sugaitebulak Fm (Sugetbulak Fm) or Yourmeinak Fm. However, regionally, there seems to be the Aksu Gr also below the Yourmeinak Fm.
Regional extent
Aksu-Kalpin region. Yourmeinak, Xinjiang.
GeoJSON
Fossils
Age
Depositional setting
Additional Information
The calcareous siltstone of the Muyangtan Formation was dated as 774±33 Ma by the U-Pb whole rock method (Zhu Jiechen and Sun Wenpeng, 1987).