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Daguding Formation
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Daguding Fm base reconstruction

Daguding Fm

Period: 
Jurassic

Age Interval: 
Late Jurassic, (39a; TJ95a)


Province: 
Jiangxi

Type Locality and Naming

Type section at the Daguding hill close to Jinshanqing Palace, southwest of Guixi County, Jiangxi Province. Named by Northeastern Jiangxi Regional Geological Survey Team, Beijing College of Geology, 1961, Explanatory Text of Integrative Regional Geological Survey of the Shangrao District, Jiangxi.

Synonym: Daguding Member (of Wuyi Fm before becoming Wuyu Gr)


Lithology and Thickness

Purple-red breccia tuff and ignimbrite, interlayered with rhyolite, siltstone and sandy conglomerate (Lower); purple-red and gray-green andesite, agglomerate, tuffaceous breccia and tuff


Lithology Pattern: 
Volcanic ash


Relationships and Distribution

Lower contact

Upper contact

Uncertain due to complexity in stratigraphic nomenclature; but Ehuling Fm is used here as next younger formation – see Additional information.

Regional extent


GeoJSON

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Fossils


Age 

Shown as Berriasian-early Valanginian by Xi et al (2019; Cretaceous integrated stratigraphy and timescale of China); but LA-ICP-MS zircon U-Pb ages are ca. 162-160 Ma range (summary in Xing, G.F., et al., 2021, "Mesozoic-Cenozoic volcanic cycle … East China". Jour. Earth Sci.) = early Oxfordian"These age data indicate that the Ehuling Fm mainly spans 142–129 Ma, Daguding Fm 144–128.5 Ma, and Shixi Fm 142–128 Ma, demonstrating that the Wuyi Gr was formed during the Berriasian-Hauterivian [Tithonian-mid-Hauterivian in GTS2020 age model] of the early Early Cretaceous and the three subordinate formations are almost coeval. [quote from Li, Xianghui et al., 2019. "Refined chronostratigraphy of the late Mesozoic terrestrial strata in South China and its tectono-stratigraphic evolution", Gondwana Res. 66: 143-167. https://doi.org/10.1016/j.gr.2018.09.006] => for graphic purposes retaining the "traditional" upward succession in a stratigraphic column, then Daguding Fm placed here as Tithonian; Ehuling Fm as Berriasian; and Shixi Fm as Valanginian-earliest Hauterivian.

Age Span: 

    Beginning stage: 
Tithonian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
149.24

    Ending stage: 
Tithonian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
143.10

Depositional setting


Depositional pattern:  


Additional Information

"The age distribution shows that the Daguding Fm, Ehuling Fm, and Shixi Fm of the Wuyi Gr were not continuously upward succeeded but prograded laterally in the Ganzhou Basin (see Section 5.1). The procedure of the progradation could be interpreted as follows: the Daguding Fm was firstly founded, and it is the representative of the earliest volcanic eruption for theWuyi Gr; the Ehuling Fm had been laterally and distally accumulated while the Daguding Fm was succeeded by the persistent volcanism; the Shixi Fm had thereafter been deposited and constructed with pyroclastics and sediments in a further distal basin far away fromcraters. The three formations show different contact relationship in the Xinjiang Basin, where the Daguding Fm may have been underlain by the Ehuling Fmand Shixi Fm, and the latter two formations were mostly coeval." [quote from Li, Xianghui et al., 2019. "Refined chronostratigraphy of the late Mesozoic terrestrial strata in South China and its tectono-stratigraphic evolution", Gondwana Res. 66: 143-167. https://doi.org/10.1016/j.gr.2018.09.006]


Compiler:  

Wan Xiaoqiao; with items added fom Li et al., 2019.