Tectono-depositional pattern and evolution of the middle Yangtze Platform (South China) during the late Ediacaran

Ding, Yi; Chen, Daizhao; Zhou, Xiqiang; Guo, Chuan; Huang, Taiyu; Zhang, Gongjing

doi:10.1016/j.precamres.2019.105426

Cited by 29 publications

(30 citation statements)

References 58 publications

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“…On the eastern flank of the uplift, palaeo-weathering crust (rich in Fe oxides) was preserved on the top of the Nantuo diamictites at Huaqiao (Figures 2 and 3c), indicating the glacial sediments experienced subaerial exposure before deposition of the Doushantuo Formation. The widespread occurrence of wavy to coarse planar or horizontal laminations in the thick-bedded to massive cherts of the overlying Liuchapo Formation at this locality (Figure 3d) are similar to the microbial laminations occurring in the equivalent shallow-water platform Dengying Formation (dolostones), suggestive of microbial mats formed on the tidal (intertidal-supratidal) flat (e.g., Ding et al, 2019). Penecontemporaneous silification of the microbial dolomites in the silica-supersaturated seawater could have perfectly preserved the primary structures of microbial carbonates probably by accelerating seafloor subsidence due to tectonic extension beyond the principal Yangtze Platform (Chen et al, 2009;.…”

Section: Ediacaran Upliftmentioning

confidence: 59%

“…Penecontemporaneous silification of the microbial dolomites in the silica‐supersaturated seawater could have perfectly preserved the primary structures of microbial carbonates probably by accelerating seafloor subsidence due to tectonic extension beyond the principal Yangtze Platform (Chen et al, 2009; Wang et al, 2012). Farther eastward to Dalongtan, hummocky cross‐stratification occurs extensively in the Liuchapo Formation (Figure 3e), also suggesting a shallow water regime (above storm wave‐base) during deposition (Ding et al, 2019).…”

Section: Geological Settingmentioning

confidence: 97%

“…Farther eastward to Dalongtan, hummocky cross-stratification occurs extensively in the Liuchapo Formation (Figure 3e), also suggesting a shallow water regime (above storm wave-base) during deposition (Ding et al, 2019).…”

Section: Ediacaran Upliftmentioning

confidence: 98%

“…During the Ediacaran‐Cambrian (E‐C) transition (ca. 551–525 Ma), the Yangtze Block experienced intense extensional activity and block tilting (Ding et al, 2019; Korsch, Mai, Sun, & Gorter, 1991). As a result, a series of carbonate platforms were developed on palaeohighs that were separated by narrow intraplatform or interplatform basins where chert and black shale were exclusively deposited (Chen, Wang, Qing, Yan, & Li, 2009; Ding et al, 2019; Wang et al, 2012).…”

Section: Geological Settingmentioning

confidence: 99%

“…551–525 Ma), the Yangtze Block experienced intense extensional activity and block tilting (Ding et al, 2019; Korsch, Mai, Sun, & Gorter, 1991). As a result, a series of carbonate platforms were developed on palaeohighs that were separated by narrow intraplatform or interplatform basins where chert and black shale were exclusively deposited (Chen, Wang, Qing, Yan, & Li, 2009; Ding et al, 2019; Wang et al, 2012). This inherited carbonate platform‐basin configuration exerted a fundamental control on the subsequent deposition of extensive black shales during the marine transgression in the Early Cambrian.…”

Section: Geological Settingmentioning

confidence: 99%

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Redox fluctuations and organic accumulation on the outer shelf of the Early Cambrian (Ages 2–3) Yangtze sea: Geochemical records on a seaward submarine sill

et al. 2020

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The Early Cambrian was a critical interval marked by dramatic oceanic, geochemical, and biological changes in Earth's history. Although numerous studies have documented oceanic redox changes and revealed a heterogeneous pattern from the inner shelf to outer shelf margin in the Yangtze Block, less attention has been paid to their palaeogeographic-specific occurrences, particularly in the deeper basinal regime during that time. To better understand marine redox variations and organic accumulation across the entire outer shelf-basin transect, we selected a coeval organic-rich section (i.e., Guantang section, western Hunan) deposited on a farther seaward submarine sill for a comparison. Integrated geochemical data of iron speciation, redoxsensitive trace element [i.e., molybdenum (Mo) and uranium (U)] concentrations and total organic carbon (TOC) contents as well as P/Al and Ba/Al ratios, in combination with previously published data from the outer shelf slope-basin, reveal an overall high TOC content on the sill and further attest to the occurrence of a fluctuating euxinic water wedge overlying the deep ferruginous water on the outer shelf slope to basin transect in the presence of oceanic upwelling system. The fluctuating euxinic watermass could be dynamically advanced upslope and retreated downslope in the pace of sea-level rise and fall. All these signify the critical roles of palaeogeographic setting and eustatic changes in controlling the spatiotemporal productivity and redox fluctuations in the Yangtze sea during the Early Cambrian.

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Section: Ediacaran Upliftmentioning

confidence: 59%

Section: Geological Settingmentioning

confidence: 97%

Section: Ediacaran Upliftmentioning

confidence: 98%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

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Redox fluctuations and organic accumulation on the outer shelf of the Early Cambrian (Ages 2–3) Yangtze sea: Geochemical records on a seaward submarine sill

et al. 2020

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Hydrothermal silicification in Ediacaran Dengying Formation fourth member deep dolomite reservoir, Central Sichuan Basin, China: Implications for reservoir quality

Wang

Jiang

Yang³

et al. 2023

Geological Journal

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The Ediacaran Dengying Formation fourth member in Central Sichuan Basin is the deep dolomite gas reservoir with the largest natural gas reserves in China, providing an excellent example for understanding the effect of hydrothermal silicification on deep dolomite reservoir quality. By integrating petrology, geochemistry and physical property measurement, this study aims to reveal the genesis of different quartz phase and their corresponding diagenetic events, and to discuss the temporal relationship of diagenetic events and their effects on the quality of deep dolomite reservoir in Dengying fourth member. Three phases of quartz cement are identified in Ediacaran Dengying Formation deep dolomite reservoirs of Central Sichuan Basin as follows: (1) first‐stage quartz filled in primary reservoir spaces, (2) second‐stage quartz mainly filled in secondary reservoir spaces, and (3) third‐stage quartz filled in secondary reservoir spaces with Mississippi Valley‐Type minerals. By analysing petrographic and temporal relationships between these fabrics, it is suggested that the first‐stage quartz precipitated during the syndiagenetic stage, the second‐stage quartz precipitated during middle diagenetic stage, and the third‐stage quartz precipitated during middle diagenetic stage as well. Silicification during syndiagenetic stage is characterized by replacement of cryptocrystalline quartz and cementation of first‐stage quartz within matrix dolomite (MD). After syndiagenetic silicification, the mineral composition of the MD changed from magnesium calcium carbonate to silica, and the later constructive diagenetic alterations were almost ineffective. The distribution of syndiagenetic silicification during syndiagenetic stage gradually decreases from the platform‐interior to the platform‐margin. The second‐stage and third‐stage quartz cements, derived from two‐stage hydrothermal silicification in the middle stage, are both destructive for reservoir preservation. This study, combined with coeval vapour–liquid inclusions Th data and thermal‐burial models, constrains the time of the second‐stage quartz to ca. 403–408 Ma, suggesting an hydrothermal silicification related to the Caledonian movement. The time of the third‐stage quartz cement is constrained to ca. 259.4 Ma, associated with Late Permian eruption of Emeishan flood basalts.

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Facies analysis and depositional evolution of Lower–Middle Ordovician carbonates in the Shuntuoguole Low Uplift of Tarim Basin (NW China)

Han,

Chen,

Cao

et al. 2023

Facies

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Tectono-depositional pattern and evolution of the middle Yangtze Platform (South China) during the late Ediacaran

Cited by 29 publications

References 58 publications

Redox fluctuations and organic accumulation on the outer shelf of the Early Cambrian (Ages 2–3) Yangtze sea: Geochemical records on a seaward submarine sill

Redox fluctuations and organic accumulation on the outer shelf of the Early Cambrian (Ages 2–3) Yangtze sea: Geochemical records on a seaward submarine sill

Hydrothermal silicification in Ediacaran Dengying Formation fourth member deep dolomite reservoir, Central Sichuan Basin, China: Implications for reservoir quality

Facies analysis and depositional evolution of Lower–Middle Ordovician carbonates in the Shuntuoguole Low Uplift of Tarim Basin (NW China)

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