What besides redox conditions? Impact of sea-level fluctuations on redox-sensitive trace-element enrichment patterns in marine sediments

Peng, Junwen

doi:10.1007/s11430-021-9959-8

Cited by 5 publications

(3 citation statements)

References 57 publications

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“…Barium (Ba), a crucial nutrient for marine phytoplankton (Schoepfer et al., 2015), when normalized to aluminum content (Ba/Al), served as a proxy for primary productivity (Tribovillard et al., 2006). Iron‐sulfur‐carbon (Fe‐S‐C) ternary diagrams have been extensively used to determine redox conditions in both ancient and modern marine sediments (Arthur & Sageman, 1994; Dean & Arthur, 1989; Peng, 2022). In this context, the sulfur/iron (S/Fe) ratio is particularly telling.…”

Section: Methodsmentioning

confidence: 99%

Orbital and Millennial‐Scale Cycles Through the Hirnantian (Late Ordovician) in Southern China

Jin,

Cao,

Hou

et al. 2024

Geochem Geophys Geosyst

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The Hirnantian period, making the end of the Ordovician with significant mass extinctions and large ice‐sheets, is a critical interval for studying paleoclimate variations. This research represents the first cyclostratigraphic study of this period, utilizing high‐resolution (1 mm sampling rate) geochemical data from the ∼7‐m thick SH‐1 drill core, capturing the latest Ordovician glaciation. Our analysis identifies the presence of Milankovitch cycles with periods of 17–21, ∼33, and ∼100‐kyr, suggesting an optimal sedimentation rate of 3.1 m/Myr. Notably, we detected signals of millennial‐scale variability, aligning with the ∼1.5‐kyr Dansgaard‐Oeschger and ∼2.4‐kyr Hallstatt heliomagnetic cycles, even in deposits lacking visible laminae alternation. This finding bolsters the hypothesis of an external origin for these millennial‐scale features. Additionally, our reconstruction of sea‐level variations, using principal component analysis and sedimentary noise modeling, reveals two intervals of sea‐level fall and one sea‐level rise, linked to an astronomical forcing cycle of ∼1.2‐Myr. The obliquity band power‐total power ratios correspond to ∼1.2‐Myr periodicities for s4‐s3 term. The synchronization of ∼1.2‐Myr cycle minimum with a sea‐level drop (low PC1 value) suggests that glacio‐eustatic variations were influenced by ∼1.2‐Myr obliquity modulation cycles. This research enhances our understanding of glacio‐eustasy during the latest Ordovician from an astronomical perspective, offering valuable insights into the interplay between orbital cycles and Earth's paleoclimate.

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Section: Methodsmentioning

confidence: 99%

Orbital and Millennial‐Scale Cycles Through the Hirnantian (Late Ordovician) in Southern China

Jin,

Cao,

Hou

et al. 2024

Geochem Geophys Geosyst

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“…The C-S-Fe three-terminal diagram has been widely used in the restoration of the paleoredox environment in sediments (Dean and Arthur, 1989;Arthur and Sageman, 1994). According to the C-S-Fe three-terminal diagram, S/Fe can be used to evaluate paleoredox environments (Dean and Arthur, 1989;Peng, 2022). The concentration of the element Mo in sediments usually occurs in strongly-reducing water environments (Algeo and Tribovillard, 2009;Tribovillard et al, 2012).…”

Section: Content Of Elementsmentioning

confidence: 99%

Factors Controlling Organic Matter Enrichment in Alkaline Lacustrine Source Rocks: A Case Study of the Late Paleozoic Fengcheng Formation in the Junggar Basin, NW China

Huang

Jiang

et al. 2023

Acta Geologica Sinica (Eng)

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The Late Paleozoic Fengcheng Formation shale (LPF shale) in Junggar Basin, NW China, is the oldest alkaline source rocks discovered in the world, which provides a unique perspective for exploring organic matter (OM) enrichment in alkaline lake environment. Combined with the organic carbon isotope profile and paleoenvironment proxies, this study reveals that the LPF shale was deposited in an arid climate with high salinity and strong reductive environment, accompanied by frequent volcanic activities. High TOC values are concentrated in two intervals with frequent fluctuations in OM types. A negative excursion due to changes in sedimentary OM source is found in δ13Corg profile. The excursion corresponds to the OM enrichment interval and accompanied by abnormally high values of Sr/Ba and Sr/Cu. This implies that the extreme arid climate has led to high salinity, resulting in strong reducibility and changes in paleontological assemblages, which in turn controlled the differential enrichment of OM. The Fengcheng Fm. high‐quality source rocks are the result of the combined action of climate events, volcanism, high‐salinity water environment, and superior hydrocarbon‐generating organisms. The results provide new insights into the formation conditions of terrestrial alkaline high‐quality source rocks and control factors of alkaline OMs enrichment.

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“…Dilution of organic matter is a complex function of sedimentation rates [8,9] and biogenic alteration of inorganic matter [2,10]. The redox conditions of seawater also have a significant effect on the preservation of organic matter and can prevent its oxidation and destruction in sediments [11][12][13][14][15]. Organic matter enrichment in shales has been explained by two distinct models, i.e., the primary productivity and preservation models [5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Organic Matter Enrichment Mechanisms in the Lower Cambrian Shale: A Case Study from Xiangandi #1 Well

Zhou,

Feng,

Zhang

et al. 2024

Minerals

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In order to investigate the effect of primary productivity, organic matter dilution, and preservation on the accumulation of organic matter, geochemical data, and proxies of primary productivity, clastic influx, and redox conditions were obtained for organic-rich shales in the Cambrian Niutitang Formation. The primary productivity (total organic carbon [TOC], Mo, P, Ba, and Babio) and redox (Ni/Co, V/Cr, U/Al, and Th/U) proxies suggest the organic-rich shales were deposited in anoxic-euxinic conditions during periods of high primary productivity. Pyrite in the Niutitang Formation comprises spherical framboids, which also indicate that anoxic bottom waters were present during organic matter deposition. High primary productivity enhanced the organic C flux into the thermocline layer and bottom waters, which lead to the development of anoxic bottom waters owing to O2 consumption by microorganisms and organic matter degradation. The anoxic bottom waters were beneficial for the preservation of organic matter. In addition, Ti/Al ratios correlate well with TOC contents throughout the Niutitang Formation, indicating that clastic input increased the burial rate and prevented organic matter degradation during deposition. Therefore, the accumulation of organic matter in the Niutitang Formation was controlled mainly by primary productivity rather than bottom-water redox conditions.

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What besides redox conditions? Impact of sea-level fluctuations on redox-sensitive trace-element enrichment patterns in marine sediments

Cited by 5 publications

References 57 publications

Orbital and Millennial‐Scale Cycles Through the Hirnantian (Late Ordovician) in Southern China

Orbital and Millennial‐Scale Cycles Through the Hirnantian (Late Ordovician) in Southern China

Factors Controlling Organic Matter Enrichment in Alkaline Lacustrine Source Rocks: A Case Study of the Late Paleozoic Fengcheng Formation in the Junggar Basin, NW China

Organic Matter Enrichment Mechanisms in the Lower Cambrian Shale: A Case Study from Xiangandi #1 Well

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