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Mesoproterozoic

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Xingxingxia Gr

Xingxingxia Gr

Period: 
Mesoproterozoic

Age Interval: 
Jixianian (Calymmian) Jx (3)


Province: 
Xinjiang

Type Locality and Naming

Eastern Middle Tianshan. The Xingxingxia Gr was named by Lu Qing, Gao Zhenjia et al. in 1961. The naming section is located at Xingxing Mountain, near Xingxing Gorge, Hami City, Xinjiang Weiwuerzhu Zizhiqu (Xinjiang Uygur Autonomous Region). The reference section is located north of Jianshanzi, Hami County, Xinjiang Weiwuerzhu Zizhiqu (Xinjiang Uygur Autonomous Region).

Synonym: （星星峡群）


Lithology and Thickness

The group is dark-grey to grey gneiss and schist, accompanied with minor marble, locally migmatite. The Lower part is dominated by biotite hornblende quartz schist, gneiss and migmatite, replaced upward by biotite quartz schist, hornblende quartz schist and marble bands. Top part consists of muscovite marble and crystalline limestone. The total thickness may reach 4300 m


Lithology Pattern: 
Gneiss


Relationships and Distribution

Lower contact

Bottom is not seen.

Upper contact

Top is in conformable contact with Kawabulak Gr (it is also termed Jianshanzi Gr).

Regional extent

Eastern Middle Tianshan. It is exposed in Xingxingxia, Jianshanzi, and Kalatag south of Hami City, Kawabulak and Kumux south of Shanshan County. Among these areas it is more seriously metamorphosed in Xingxing Gorge and Kumux, where most rocks were metamorphosed into a migmatite level.


GeoJSON

null

Fossils


Age 

The gneiss is dated by U-Pb (whole-rock) at 1400 ±73 Ma and by Pb-Pb isochron at 1311.9 Ma. However, SHRIMP U-Pb dates of 1436 ±13 Ma and 1405.2 ±7.8 Ma are acquired from the granodioritte gneiss in the Xingxingxia Fm (Hu Aiqing et al., 2006). Shown on schematic stratigraphic column as spanning the Changchengian (Statherian); but dates imply middle Jixian => put as lower to middle Jixianian (Calymmian) here.

Age Span: 

    Beginning stage: 
Calymmian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,600.00

    Ending stage: 
Calymmian

    Fraction up in the ending stage: 
0.7

    Ending date (Ma):  
1,460.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Extracts from The Mesoproterozoic Erathem (chapter in Stratigraphic Lexicon of China, draft of 2022) by Gao Linzhi, Ding Xiaozhong, Zhang Chuanheng, Zhang Heng.