Kalagang Fm
Type Locality and Naming
The type section is located in the eastern part of the Harjiawu area to the southeast of Jimunai County, Xinjiang. It was named by the 3rd Regional Geological Survey Expedition under the Xinjiang Geological Bureau in 1959, and was cited officially by Dou Yawei, Sun Zhehua in 1985.
Lithology and Thickness
Volcaniclastics. It is divisible into two parts: The Lower part of the formation consists of grey-green coarse-grained sandstone, pebble-bearing sandstone, siltstone, dacite and volcanic breccia. The base of the formation is composed of grey-green coarse-grained sandstone, intercalated with pebble-bearing sandstone. The Upper part of the formation is composed of yellow-brown purple acidic tuff, tuffaceous conglomerate, rhyolite, felsitic porphyry and andesite. Total thickness is 1437 m
Relationships and Distribution
Lower contact
Conformable contact with the underlying Harjiawu Fm
Upper contact
Unconformable contact with the overlying strata (Zhaheba Fm)
Regional extent
Distributed in the Tiebuke Mt. and on the northern slope of the Sawur Mt. in its eastern segment. Northwesterly from the Harjiawu area to the Jimunai County the contact between the Kalagang Fm and the Harjiawu Fm is obviously an unconformable one. In the Naohaizhu-wankala area its Lower Subformation is composed of coal-bearing clastic rocks, while its Upper Subformation consists of volcaniclastic rocks, with a thickness of 513-762 m. Westerly it has gradually been changing to pyroxene andesitic porphyrite, andesitic volcanic breccia and basalt.
GeoJSON
Fossils
Yields Angaropteridium-Zamiopteris plant assemblage
Age
Depositional setting
It is interpreted as continental lava and volcaniclastic deposits.
Additional Information