The Upper Ordovician Pagoda positive δ13C excursion (PPCE) on the Upper Yangtze Platform, South China

Ma, Xueying; Ogg, James G.; Lu, Yuanzheng; Fan, Ruihua; Huang, Chunju; Luo, Zhendong; Deng, Shuai

doi:10.1016/j.jseaes.2022.105373

Cited by 3 publications

(6 citation statements)

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“…The cyclostratigraphic results indicated the duration of the PPCE in the Liangcun and Sanquan sections. The duration of the PPCE in the Sanquan section was 4.37 myr and that in the Liangcun section was 3.75 myr (Ma et al, 2022).…”

Section: Defining the Chemostratigraphic And Stratigraphic Gap Underl...mentioning

confidence: 95%

“…PPCE developed in the Middle-Late Katian and Late Ordovician, while the Guttenberg δ 13 C Excursion (GICE) defined in the Baltoscandia and America, extended from the Late Sandbian to the Early Katian. Moreover, it was demonstrated that the PPCE (3.68-4.37 myr) and GICE (2.35 myr) events have different durations based on cyclostratigraphic results by Ma et al (2022). The unconformity most likely results in different durations of the PPCE.…”

Section: The Top Of the Pagoda Formation And Linxiang Formationmentioning

confidence: 96%

“…The Jiaodingshan section spreads into the Malie, Hanyuan, Yaan, and Sichuan provinces and is located 67 km northeast of the Hanyuan government office (102.87N, 29.4E) (Figure 1B). The Jiaodingshan is the eastern remnant of the Daxiangling Mountain Range, which shows a north-south trend 2A) (Ma et al, 2022).…”

Section: Study Sections and Lithologymentioning

confidence: 99%

“…All in all, combining these two methods, the δ 13 C and δ 18 O values in the study sections were considered to be reliable (Table 2). The isotopic results in the Sanquan and Hongyan sections are quoted from Ma et al (2019c), Ma et al (2022).…”

Section: Reliability Of the Isotopic Datamentioning

confidence: 99%

“…The P1 recognized in the Pagoda Formation is less completed in the Hongyan section than in the Sanquan section, which illustrates that the Pagoda Formation is in parallel unconformity contact with the underlying strata and the stratigraphic gap underlying the Pagoda Formation in the Sanquan section is larger than that in the Hongyan section. The comparison results and the duration time have been published in another study and will not be discussed in-depth (Ma et al, 2022).…”

Section: The Top Of the Pagoda Formation And Linxiang Formationmentioning

confidence: 99%

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Using chemostratigraphy and biostratigraphy methods to define the unconformity underlying the Upper Ordovician Pagoda Formation in the Upper Yangtze Platform

Ma,

Deng,

et al. 2023

Front. Earth Sci.

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The discovery of hydrocarbon in the Pagoda Formation in South China has received attention from the petroleum industry. This research paper identifies the discontinuity surface underlying the Pagoda Formation. The Upper Ordovician strata were correlated in different regions using the conodont biostratigraphy, and δ13C and δ18O isotope stratigraphy. The biostratigraphic result illustrates that three conodont zones can be established in each study section, and one to three conodont zones are missing in the lower Pagoda Formation and the strata underlying the Pagoda Formation of the Upper Yangtze Platform. Moreover, the chemostratigraphic result highlighted that the development of the lower δ13C isotope positive excursion events in the Xiaogangwan and Liangcun areas was less complete than that in the Jiaodingshan area. Combined with the cyclostratigraphic results, the development of the δ13C isotope positive excursion is not complete. The development of the δ13C excursion event is more complete in the south and east than in the center and north. This demonstrates that the Pagoda Formation began its deposition at different times and the transgression process may have advanced from the southeast to the north and that the contact between the Pagoda Formation and the underlying formation is not conformable. It is proposed that the Late Ordovician in the South China Plate was affected by the tectonic movement and the cooling paleoclimate at that time, which resulted in the discontinuity between the Pagoda Formation and the underlying strata. The unconformity could be the channel for hydrocarbon migration or for the high-quality oil and gas reservoirs being developed and preserved under the unconformity surface.

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Section: Defining the Chemostratigraphic And Stratigraphic Gap Underl...mentioning

confidence: 95%

Section: The Top Of the Pagoda Formation And Linxiang Formationmentioning

confidence: 96%

Section: Study Sections and Lithologymentioning

confidence: 99%

Section: Reliability Of the Isotopic Datamentioning

confidence: 99%

Section: The Top Of the Pagoda Formation And Linxiang Formationmentioning

confidence: 99%

See 3 more Smart Citations