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- W4324363432 abstract "The terminal Ediacaran was a critical period in Earth history due to the coincidence of climate change, seawater chemistry variability, biological innovation, and tectonic activity. The Wushi–Aksu area in the NW Tarim Block contains widely distributed terminal Ediacaran outcrops, providing important sedimentological and paleo-environmental information. A detailed investigation of the Ediacaran Xiaoerbulake–Xigou (XG) and Shayilike (SA) outcrop sections in the NW Tarim Block identified 14 types of lithofacies: mudstone (F1), sandstone (F2), conglomerate (F3), mixed siliciclastic–dolomicrite (F4), mixed siliciclastic–dolograinstone (F5), mixed siliciclastic–dolo-oolite (F6), dolomicrite (F7), dolograinstone (F8), dolo-oolite (F9), planar–wavy stromatolitic dolomite (F10), domal stromatolitic dolomite (F11), stratiform-like thrombolitic dolomite (F12), domal thrombolitic dolomite (F13), and foamy microbial dolomite (F14). A model of the depositional evolution of the Ediacaran Qigebrak Formation in the study area was established, which indicates a shift in the depositional system from an early mixed carbonate–siliciclastic tidal-flat environment to a late carbonate platform, and the Tabei massif was confirmed as the provenance of terrigenous detrital input in early mixed tidal flats. The Ce anomalies of the carbonate fraction ranged from negligible (Ce/Ce* = 1.18 ± 0.18) in the lower mixed carbonate–siliciclastic system to clearly negative (Ce/Ce* = 0.74 ± 0.10) in the upper carbonate-platform facies, indicating the progressive oxidation of shallow seawaters. The coupled evolution of depositional systems and paleo-redox conditions may explain the positive anomaly of ∼ 7‰ in the lower part of δ13Ccarb profiles (i.e., in the mixed carbonate–siliciclastic facies). In the early mixed carbonate–siliciclastic system, terrigenous input provided nutrients, enhancing primary productivity and increasing the burial of organic carbon in the suboxic environment, resulting in an increase in 13C levels in seawater and a positive δ13Ccarb anomaly. This study highlights the contribution of regional sedimentary environments to the positive δ13Ccarb anomaly, indicating that caution is necessary in its application in global Ediacaran correlations." @default.
- W4324363432 created "2023-03-16" @default.
- W4324363432 creator A5008506855 @default.
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- W4324363432 creator A5071030446 @default.
- W4324363432 date "2023-06-01" @default.
- W4324363432 modified "2023-09-24" @default.
- W4324363432 title "The coupled evolution of depositional systems and paleo-redox conditions was recorded in terminal Ediacaran sedimentary succession in the Tarim Block, NW China" @default.
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