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Xiangkuang Formation
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Xiangkuang Fm base reconstruction

Xiangkuang Fm

Period: 
Neoproterozoic

Age Interval: 
late Qingbaikouan (middle Tonian), Qb （26-a)


Province: 
Shandong

Type Locality and Naming

Northeast peninsula of Shandong. The Xiangkuang Fm was named by the Jiaodong (E. Shandong) Geological Survey of Changchun College of Geology in 1960. It was quoted by the Committee of Stratigraphy of China in 1962. The naming section is located in Xiangkuang Douya, Qixia County, Shandong Province.

Synonym: （香夼组）


Lithology and Thickness

The Xiangkuang Fm consists of a suite of pelitic carbonate. Lower part is mainly gray, blue gray, yellow gray, gray green marl with gray thin-bedded limestone and yellowish gray thin-bedded pelitic limestone with minor calcareous slate. Upper part consists of gray, yellowish gray and dark gray medium- to thick-bedded limestone, dolomitic limestone. In the top part, thick-bedded limestone includes minor black siliceous masses. It is about 1020 m in thick.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

In the bottom, brown gray thin-bedded marl rest conformably on the underlying yellow green slate at top of the Mashan Fm.

Upper contact

The blue gray dolomitic crystalline limestone at the top of the formation shows intrusive contact with granophyric textured granite. In many places, the top part is covered by Quaternary or Cretaceous strata.

Regional extent

Northeast peninsula of Shandong. The formation is distributed locally, which are mainly developed in the Xiangkuang Pb-Zn mine, cement factory and Douya, Qixia County, Shandong Province.


GeoJSON

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Fossils

Microplants: Trachysphaeridium sp., Lophominuscula sp., Paleamorpha punctulatea etc; Stromatolites are found in some places.


Age 

Late Qingbaikouan (middle Tonian) implied by overlying conformably on Mashan Fm (but had a Mesoproterozoic abbreviation and was not shown on strat column).

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
860.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
776.00

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.