Shabugengci Fm
Type Locality and Naming
Southwestern-most Inner Mongolia. The Shabugengci Fm was named by the No. 103 Party of Geology, Inner Mongolia Bureau of Geology in 1962. The typical locality is Shabugengci and Gezihudug Village northwest of Bayan Nuru, Alxa Zuo-qi, Inner Mongolia. Lowermost formation in Nuorgong Gr.
Synonym: （沙布更茨组）
Lithology and Thickness
The Shabugengci Fm is mainly composed of littoral clastic rock e.g. quartzite and leuco-leptite. It is subdivided into three members: The lower part of the Lower member is composed of grey-white muscovite quartz schist, the upper part g grey-black carbonaceous muscovite quartz schist intercalated with grey-white thin-bedded quartzite and black slate, occasionally with limestone lenses (about 300 m thick). Middle member is white medium-thick-bedded quartzite with thin-bedded quartzite and black slate, locally pebbly quartzite or conglomerate (over 800 m thick). Upper member consists of slate and quartzite (635 m thick). Owing to metamorphism, the formation around Gezihudug has garnet and diopside mineral crystals often seen in slate of upper member. It is stable both in lithological character and litho-facies, but greatly variable in thickness (from 1400 to 2759 m).
Relationships and Distribution
Lower contact
It is in unconformable contact with the underlying Alxa Gr.
Upper contact
It is in conformable contact with Taklinobo Fm (Tekelin’aobao Fm)
Regional extent
Southwestern-most Inner Mongolia. It is distributed only in Shabugengci, Gezihudug and Mailizhi Obo, west of Bayan Nuru-Zhonggaxiu, Inner Mongolia.
GeoJSON
Fossils
Age
Depositional setting
Additional Information
Reliable isotopic chronological data was lacking as of this 2019 Lexicon entry.