Kulumuti Gr
Type Locality and Naming
It was named by the Party of Regional Geological Survey, the Xinjiang Bureau of Geology in 1965 and published by Wang Wuyan in 1990. The type section is at northeast of Altay City, and the reference section is located on the eastern bank of Ertix River, south of Haizikou, northeast Fuyun (Koktokay) County, in the Xinjiang Uygur Zizhiqu.
Synonym: (库鲁木提群); Kelumute Fm. Mu Enzhi (1964) quoted the Kelumute Rock Series proposed by Yuan Fuli and renamed it the Kelumute Gr. He indicated that the Kelumute Rock Series comprised light gray green sandstone, siltstone and schist intercalated with abundant round-gravels and conglomerate, exposed in Kurt, Karamelei River reaches and the Kayelete and Kelumute “two river originating” Songmukedaban, and yielded fossils anthozoa and brachiopod such as the striking one Spirifer pedaschenkowi (i.e., Tannuspirifer). According to the description mentioned above, the Kelumute Gr must include not only the strata in Altay area but also the Upper Silurian subsystem observed in eastern Junggar. Therefore, the name Kelumute Gr with no type section indicated can hardly be used. Although the names “the Kelumute Gr” and “the Kulumuti Gr” share the same origination, the name “Kulumuti Gr” with distinct implication and defined type section should be accepted.
Lithology and Thickness
It can be subdivided into two subgroups. Lower subgroup, 5297 m in apparent thickness, is mainly composed of gray andalusite-, or staurolite-, or cordierite-mica schist, mica-quartz schist and quartzite. Upper subgroup, 900 m in apparent thickness, is dominated by gray, gray green meta-sandstone with minor siltstone and quartzose sandstone.
Relationships and Distribution
Lower contact
No boundaries of the Kulumuti Gr with its underlying Fm is yet observed. However, in the area north of Fuyun, there exists quartzose sandstone about 100 m in thickness in between the group with the underlying Ordovician, which indicates that there might be hiatuses between the Kulumuti Gr with both its underling and overlying formations. Regionally, the next older unit is the Balhaba Fm of upper Ordovician.
Upper contact
No boundaries of the Kulumuti Gr with its overlying Fm is yet observed. However, in the area north of Fuyun, there exists quartzose sandstone about 100 m in thickness in between the group with the overlying Devonian, which indicates that there might be hiatuses between the Kulumuti Gr with both its underling and overlying formations.
Regional extent
The group is exposed in the Altay Mts. area with a northwest-southeast strike and with its thickness decreasing from northwest to southeast.
GeoJSON
Age
Depositional setting
Additional Information