Xinglongshan Gr
Type Locality and Naming
Central-south Gansu. The Xinglongshan Gr was named by Qu Zhanru in 1962. The naming section is located at Xinglong Gorge, Yuzhong County, southeast of Lanzhou City, Gansu Province.
Synonym: （兴隆山群）
Lithology and Thickness
The group consists of low-grade metamorphosed volcanic clastic rocks. It is subdivided into lower and upper formation complexes on the basis of the characteristics of the lithological assemblage. Lower formation complex is composed of low-grade metamorphosed intermediate basic volcanic rock, volcaniclastics and clastic rock, accompanied with some layers of limestone. It is recorded to about 1000 m thickness. Upper formation complex is phyllite sandwiched with clastic rock, metamorphosed volcaniclastics and minor iron ore. It is about 800 m thick. It is laterally quite changeable both in lithological character and thickness. It is thickening from east to west and simultaneously the volcanic rock decreases (thins), but the clastic rock increases (thickens). The total thickness is up to 2000 m.
Relationships and Distribution
Lower contact
Regionally, the group contacts conformably with metamorphosed clastic rock of the underlying Huluhe Fm (Not in Lexicon).
Upper contact
Schematic stratigraphic column shows a major discontinuity to the overlying Lower Cretaceous
Regional extent
Central-south Gansu. The Xinglongshan Gr is distributed in Xinglong Mountain, southeast of Lanzhou City, stretching in northwest-southeast direction.
GeoJSON
Fossils
Age
Depositional setting
Additional Information