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Luoquanzhan Formation

Luoquanzhan Fm

Period: 
Triassic

Age Interval: 
Late Triassic, (TJ11b)


Province: 
Heilongjiang

Type Locality and Naming

It is located at Beishan, Luoquanzhan, Dongning County, Heilongjiang. It was named by the comprehensive geological survey team of Jilin Geological Bureau from 1979 to 1980. And it was first publicly cited by Jilin Bureau of Geology and Mineral Resources in 1981.

Synonym:


Lithology and Thickness

It is dominated by the gray-white, yellow-green, gray-yellow rhyolite, rhyolite tuff, dacite and gray-green-yellow-brown tuffaceous fine sandstone, siltstone, tuff intercalated with gray thin argillaceous siltstone and mudstone. The thickness is 881.44 m.


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

Implied that the Nancun Fm is the next older regional unit. Its bottom with conglomerate is in unconformable contact with the underlying black slate of the Lower Permian Liangzichuan Fm. However, the "underlying" Nancun Fm is in unconformable contact with the Upper Kedao Fm of the late-Middle Permian.

Upper contact

Implied that the Songshushan Fm is the next younger regional unit.

Regional extent

This formation is mainly distributed in the area from Luoquanzhan to Nantianmen in Dongning, Heilongjiang, with little horizontal change.


GeoJSON

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Fossils

Plants: Neocalamites carrerei, N. hoerensis, Anomozamites minor, Pterophyllum sp., Nilssonia muensteri, Cycadocarpidium giganteum, C. swabii, Podozamites sp.


Age 

It was established three formations from bottom to top for the volcanic rock systems originally classified as Permian and Jurassic, namely Nancun Fm (neutral volcanic rock) and Luoquanzhan Fm (intermediate acidic volcanic rock, with plant fossils in the bottom sedimentary rock) and Songshushan Fm (medium-basic and acidic volcanic rocks), confirming that the age of the three formations is the Late Triassic. From 1982 to 1983, Mi Jiarong et al. thought that the Nancun Fm and Songshushan Fm may belong to the Permian, only Luoquanzhan Fm has the fossil evidence of the Late Triassic. This book adopts Mi 's opinion. [However, the schematic stratigraphic columns suggests that the Nancun Fm and Luoquanzhan Fm may be largely coeval; spanning most of Late Triassic.]

Age Span: 

    Beginning stage: 
Norian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
227.30

    Ending stage: 
Rhaetian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
201.36

Depositional setting

The tuff and siltstone at the bottom of this group are approximately the lake-swamp facies at the initial stage of the formation of the basin; the pyroclastic rocks at the bottom are volcanic eruptive facies; the acidic lava at the top are volcanic overflow facies.


Depositional pattern:  


Additional Information


Compiler:  

Cao Hongsheng, Shu Wenchao and Tong Jinnan.