Major oceanic redox condition change correlated with the rebound of marine animal diversity during the Late Ordovician

Zhang, Tonggang; Trela, Wiesław; Jiang, Shao‐Yong; Nielsen, Jens Kvist; Shen, Yanan

doi:10.1130/g32020.1

Cited by 35 publications

(27 citation statements)

References 28 publications

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“…The global sea-level fluctuations caused by growth and decay of Hirnantian icesheets are considered to have been an important influence on contemporaneous marine redox conditions (Lüning et al, 2000;Landing, 2011), although the exact nature of these effects has been debated. In most shallow-marine sections globally (i.e., shelf settings at water depths b 200 m), the onset of the Hirnantian glaciation was marked by enhanced oxygenation and its termination by a shift toward more reducing conditions (Yan et al, 2012;Zhang et al, 2011;Zhou et al, 2012). In general, this pattern reflects shallowing of sections within the ocean-surface layer during the peak of the glaciation, and deepening into the upper thermocline region during the subsequent deglaciation.…”

Section: Hirnantian Glacio-eustasymentioning

confidence: 99%

Global and regional controls on marine redox changes across the Ordovician-Silurian boundary in South China

Liu

Algeo

et al. 2016

Palaeogeography, Palaeoclimatology, Palaeoecology

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The Ordovician-Silurian (O-S) transition coincided with significant environmental and biological changes. In South China, the Yangtze Platform experienced both global and regional events at this time, including sea-level fluctuations, tectonic movements, volcanic eruptions, mass extinction, and widespread anoxia. The O-S transitional strata of the Yangtze Platform comprise organic-rich black shales that are an important oil source rock. To explore the evolution of watermass chemistry and its relationship to organic matter accumulation, we conducted an integrated Fe-S-C geochemical study (i.e., Fe-speciation, δ 13 C org , δ 34 S py , pyrite-S and TOC) of the O-S boundary sections at Datianba (Chongqing Municipality) and Shuanghe (Sichuan Province). These sections were located in the restricted inner Yangtze Sea, in contrast to the previously studied Wangjiawan section, which was deposited in a more open setting of the outer Yangtze Sea. In contrast to the well-oxygenated conditions at Wangjiawan, the Datianba and Shuanghe sections record persistently anoxic, and episodically euxinic, conditions during the Hirnantian, which can be explained by the unique paleogeography and restricted hydrography of the inner Yangtze Sea. We propose that the regional Kwangsian Orogeny, which was driven by collision of the Yangtze and Cathaysia blocks, played a key role in basin development, watermass chemistry changes, and accumulation of Wufeng Formation black shales within the Yangtze Sea. The more widespread black shales of the Lower Silurian Lungmachi Formation were linked to the post-Hirnantian global marine transgression.

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Section: Hirnantian Glacio-eustasymentioning

confidence: 99%

Global and regional controls on marine redox changes across the Ordovician-Silurian boundary in South China

Liu

Algeo

et al. 2016

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…The shallowest part of the JCF and beginning of the Wólka Formation are characterized by the lack of framboids which suggest oxic conditions in the water column (Fig.5). Sustainable growth of oxygenation in the water column has been documented by the gray-green claystone and marly mudstones from the Wólka Formation (Trela 2007, Zhang et al 2011. Beginning of the Wólka Formation sedimentation coincides in time with the interval of low sea-level documented on the Baltica (Ashgill Lowstand Interval, see.…”

Section: Discussionmentioning

confidence: 99%

“…The aim of this research is to reconstruct palaeoredox conditions during sedimentation of the JCF deposits, using for the first time pyrite framboid diameter study and compare the obtained results with sedimentological and geochemical data published elsewhere (Trela 2007, Zhang et al 2011). …”

Section: Pyrite Framboid Diameter Studymentioning

confidence: 99%

Ordovician Jeleniów Claystone Formation of the Holy Cross Mountains, Poland – Reconstruction of redox conditions using pyrite framboid study

Smolarek¹,

Marynowski²,

Trela³

2014

Contemporary Trends in Geoscience

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The aim of this research is to reconstruct palaeoredox conditions during sedimentation of the Jeleniów Claystone Formation deposits, using framboid pyrite diameter measurements. Analysis of pyrite framboids diameter distribution is an effective method in the palaeoenvironmental interpretation which allow for a more detailed insight into the redox conditions, and thus the distinction between euxinic, dysoxic and anoxic conditions. Most of the samples is characterized by framboid indicators typical for anoxic/euxinic conditions in the water column, with average (mean) values ranging from 5.29 to 6.02 µm and quite low standard deviation (SD) values ranging from 1.49 to 3.0. The remaining samples have shown slightly higher values of framboid diameter typical for upper dysoxic conditions, with average values (6.37 to 7.20 µm) and low standard deviation (SD) values (1.88 to 2.88). From the depth of 75.5 m till the shallowest part of the Jeleniów Claystone Formation, two samples have been examined and no framboids has been detected. Because secondary weathering should be excluded, the lack of framboids possibly indicates oxic conditions in the water column. Oxic conditions continue within the Wólka Formation based on the lack of framboids in the ZB 51.6 sample.

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“…That can be proved by globally distributed deep-water graptolites such as U. austrodentatus, Undlograptus sinodentatus, etc. [8,12], and also by the globally anoxic event beginning at the Darriwillian [30]. The third type, namely bell-shaped patterns, exhibits a strong enrichment in middle rare earth element.…”

Section: Ree Distribution Patternsmentioning

confidence: 99%

The environmental index of the rare earth elements in conodonts: Evidence from the Ordovician conodonts of the Huanghuachang Section, Yichang area

et al. 2011

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High-resolution microanalysis was performed on conodonts collected from the Huanghuachang section in the Yichang area using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). This region is regarded as a standard section for the division and correlation of the Ordovician system in southern China. The results show that the values of (La/Yb) N and (La/Sm) N decrease, while the values of  Ce increase as seawater deepens and energy decreases. As the sedimentary environment changes from shallow-water carbonate platform to platform margin to open continental shelf to shelf basin, rare earth element distribution curves gradually transform from a right inclined pattern to a flat pattern to a left inclined pattern and a hat-shaped pattern. The present work proves that the values and distributive patterns of rare earth elements in conodonts correspond with the sedimentary environment, and therefore provide reliable evidence for the application of rare earth element concentrations of biogenic phosphates such as conodonts for palaeoenvironmental reconstructions.Ordovician, conodonts, rare earth elements, palaeoenvironmental, Yichang Citation:Chen X H, Zhou L, Wei K, et al. The environmental index of the rare earth elements in conodonts:

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Major oceanic redox condition change correlated with the rebound of marine animal diversity during the Late Ordovician

Cited by 35 publications

References 28 publications

Global and regional controls on marine redox changes across the Ordovician-Silurian boundary in South China

Global and regional controls on marine redox changes across the Ordovician-Silurian boundary in South China

Ordovician Jeleniów Claystone Formation of the Holy Cross Mountains, Poland – Reconstruction of redox conditions using pyrite framboid study

The environmental index of the rare earth elements in conodonts: Evidence from the Ordovician conodonts of the Huanghuachang Section, Yichang area

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