Facies and diagenesis of some upper proterozoic dolomites of South China

Siegmund, Hendrik; Erdtmann, Bernd-Dietrich

doi:10.1007/bf02536942

Cited by 9 publications

(10 citation statements)

References 13 publications

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“…Given the presence of calcite pseudomorphs after gypsum crystals, the white calcite and chert nodules are interpreted as pseudomorphs after anhydrite, whereas the vugs may have resulted from wholesale dissolution of former evaporite minerals. This is in accordance with other reports of evaporite occurrences on the Dengying platform (Xi 1987;Siegmund and Erdtmann 1994;Steiner 2001;Zhu et al 2007;Lu et al 2013; see ''Depositional environments and facies development''). Taken together, a sub-to supratidal inner ramp environment above FWB is evident.…”

Section: Resultssupporting

confidence: 93%

“…Given these restrictions, the terms are only used as relative boundaries as the classical ramp model is considered appropriate to understand the general sedimentary development of the Shibantan basin. The occurrence of calcite pseudomorphs after evaporite minerals as well as of dissolution vugs in the XS-section is in good accordance with contemporaneous evaporites elsewhere on the platform (Xi 1987;Siegmund and Erdtmann 1994;Steiner 2001;Zhu et al 2007;Lu et al 2013). For instance, the lower Dengying Formation in eastern Yunnan (i.e.…”

Section: Resultssupporting

confidence: 62%

“…the Donglongtang Member) exhibits calcite pseudomorphs after gypsum crystals and stromatolitic structures, indicating deposition in a coastal tidal flat Lu et al 2013). Likewise, primary interbedding of evaporites and dolomites (now brecciated by dissolution of evaporites), dissolution vugs as well as features of meteoric diagenesis and karstification were observed in the Dengying Formation in Sansha (Hunan), indicating deposition in a restricted lagoonal environment that was repeatedly interrupted by periods of subaerial exposure (Siegmund and Erdtmann 1994). Furthermore, thick dolomites with anhydrite and up to 200-m halite were deposited in the Changnin Basin in south Sichuan (Xi 1987).…”

Section: Resultsmentioning

confidence: 90%

“…Furthermore, thick dolomites with anhydrite and up to 200-m halite were deposited in the Changnin Basin in south Sichuan (Xi 1987). The restricted conditions required to form evaporites were possibly caused by a temporarily rimmed morphology of the Ediacaran Yangtze platform (Zhu et al 2003Vernhet and Reijmer 2010;Jiang et al 2011) or the Jiangnan Uplift, which was situated between the platform in the east and the basin in the west (Xi 1987;Siegmund and Erdtmann 1994). However, the regional formation of evaporitic basins was possibly also controlled by fault-related subsidence (Xi 1987;Vernhet 2007;Vernhet et al 2007; see ''Development of the Shibantan basin'').…”

Section: Resultsmentioning

confidence: 97%

“…However, although significant evaporite deposits were reported for other areas of the Dengying platform (Xi 1987;Siegmund and Erdtmann 1994;Steiner 2001;Zhu et al 2007; see ''Depositional environments and facies development''), there is no evidence for significant amounts of evaporites in the area of Yichang. This implies that tectonic processes may have been crucial for the development of the Shibantan Member.…”

Section: Development Of the Shibantan Basinmentioning

confidence: 85%

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Depositional dynamics of a bituminous carbonate facies in a tectonically induced intra-platform basin: the Shibantan Member (Dengying Formation, Ediacaran Period)

Duda

Zhu

Reitner

2015

Carbonates Evaporites

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The Ediacaran Shibantan Member (Dengying Formation, South China) is characterised by a black, laminated bituminous limestone facies with diverse Ediacara-type organisms and trace fossils. However, still little is known about the evolution of the Shibantan basin and its sedimentary dynamics. A detailed sedimentological characterisation revealed that the Shibantan Member was deposited on a carbonate ramp system linked to an intraplatform basin. Evaporitic dolomites of the Hamajing Member (representing sub-to supratidal inner ramp environments above fair weather wave base) are sharply overlain by black, laminated limestones of the lower Shibantan Member, representing a subtidal lower-to middle ramp environment close to the storm wave base. This facies-shift implies a sudden local deepening event, probably due to a tectonically induced increase in subsidence. The Shibantan basin was subsequently filled as evidenced by the gradual transition into dark wavy dolomites deposited in a subtidal middle-ramp environment (i.e. between storm-and fair weather wave bases) and, eventually, the upper Dengying Formation (i.e. the Baimatuo Member), which represents the same depositional environments as the Hamajing Member. Sedimentation in the Shibantan basin was highly dynamic as evidenced by a distinct slumping horizon and mass-flow deposits, partly possibly due to synsedimentary tectonic processes. A microbial mat associated biota which includes Ediacara-type fossils is restricted to the lower Shibantan Member. The close spatial relationship between allochthonous event deposits and autochthonous fossil associations in this setting implies that the event deposits were not only important for the preservation of fossils, but probably also for the supply of nutrients.

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Section: Resultssupporting

confidence: 93%