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Mangzongrong Formation
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Mangzongrong Fm base reconstruction

Mangzongrong Fm


Period: 
Permian

Age Interval: 
P1-2 (53), Artinskian through Kungurian stages (middle Cisuralian through Guadalupian epochs; mid-Early through Middle Permian)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located at Mangzongrong about over 70 km to the northwest of the Zhada County Town in the western part of the Ali Region, Tibet. It was named by Liang Dingyi et al., in 1991.


Lithology and Thickness

Clastics. Lower Member of the formation is composed of grey-yellow sandy conglomerate, conglomerate, quartz-sandstone and a part of pebble-bearing slate, with a thickness of 150 m. Middle Member is composed of grey-green sandstone, greywacke, and a small amount of sandy limestone and pebble-bearing slate, with a thickness of 250-350 m; being in a conformable contact with the Lower Member. Upper member is composed of grey-green siltstone and black shale, with a thickness of 15-60 m, and is in a conformable contact with the underlying Middle Member.


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Mayang Fm,

Upper contact

Disconformable contact or locally in an unconformable contact with the overlying Danggongla Fm of the Lower Triassic

Regional extent

Distributed in the vicinity of Mayang area, Zhada County.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[78.48,33.22],[79.47,32.49],[80.27,31.68],[80.96,30.64],[80.83,30.68],[80.04,31],[79.32,31.73],[78.9,32.44],[78.48,33.22]]]]}}

Fossils

Lower Member yields brachiopod fauna represented by Stepanoviella. Middle Member yields a great amount of spiriferoids represented by Neospirifer, Fusispirifer, Spiriferella, and trachyostracous productoids represented by Taeniothaerus, Aulosteges, belonging to the Taeniothaerus assemblage; the corals are represented by the Lytvolasma fauna; and the bivalves are represented by Delponella, which are comparable with the fauna of the Quburiga Fm in the Mount Qomolangma region. Upper Member yields brachiopods represented by Neospirifer, Fusispirifer, Aulosteges, Spiriferella, Mayangella, etc., among which many of them are the predominant kinds of fossils in the Mangzongrong Fm, but no Taeniothaerus has been found and instead there had newly occurred the Lamnimargus himalayaensis, belonging to the Fusispirifer-Lamnimargus assemblage,


Age 

Lower Member belongs to the Longlinian Stage of the Chuanshanian Epoch = Artinskian Stage (middle Cisuralian Epoch; mid-Early Permian). Middle Member belongs to the Qixia’an Subepoch = Kungurian Stage (late-Cisuralian Epoch; late-Early Permian). Upper Member belongs to the late stage of the Middle Permian Epoch

Age Span: 

    Beginning stage: 
Artinskian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
290.51

    Ending stage: 
Wordian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
264.34

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing

GeoJSON estimate by Longgang Ye and Yuyin Li (Chengdu Univ. Tech. students)