Characteristics of hydrothermal sedimentation process in the Yanchang Formation, south Ordos Basin, China: Evidence from element geochemistry

Cong, He; Ji, Liming; Wu, Yuandong; Su, Ao; Zhang, Mingzhen

doi:10.1016/j.sedgeo.2016.09.001

Cited by 110 publications

(55 citation statements)

References 40 publications

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“…Rapid uplift of the Qinling Mountains caused by collision of the North China and the Yangtze landmasses (Zhang et al, ) induced rapid subsidence of the southern Ordos Basin during the early Chang 7 depositional period (Qiu et al, , ), resulting in intense and frequent volcanic and hydrothermal activities, which was responsible for the abundant tuff (alterated volcanic ash sediments) intervals (Figures e and a,c; Qiu, ; Zhang et al, ), seismites (Li et al, ; Qiu, ; Xia et al, ; Yang, Dou, et al, ), pyrite veins (Figure c), marcasite, gypsum, and manganese nodules (He, Ji, Wu, Su, & Zhang, ; Qiu, ; Zhang et al, ). Volcanic ash and hydrothermal fluids introduced abundant nutrients (e.g., P, Fe, Ni, Cu, and Zn) into the lake (Duggen, Croot, Schacht, & Hoffmann, ; Duggen et al, ; Eicher & Rounsefell, ; Kurenkov, ; Smith & White, ; Zhang et al, ; Zhang et al, ; Zhang et al, ).…”

Section: Discussionmentioning

confidence: 99%

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Palaeoproductivity and organic matter accumulation during the deposition of the Chang 7 organic‐rich shale of the Upper Triassic Yanchang Formation, Ordos Basin, China

et al. 2019

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The lacustrine Chang 7 organic‐rich shale of the Upper Triassic Yanchang Formation is a very important hydrocarbon source rock and contains high total organic carbon content (average = 5.54 wt.%). Previous studies suggest that deposits of the Chang 7 accumulated slowly under dominantly oxic–suboxic bottom‐water conditions occasionally interrupted by the establishment of anoxic conditions. However, questions remain regarding the role of palaeoproductivity in accumulation of the Chang 7 organic matter. Palaeoproductivity indicators, including P/Al, Ni/Al, Cu/Al, and Zn/Al, suggest that the deposition of the Chang 7 period was accompanied by high primary productivity level. Furthermore, productivity appears to have been highest in the middle and south‐east region of the lake, diminishing to the north‐east, the north‐west, and the south‐west. Elevated productivity resulted in the flux of large amounts of organic matter to the lake floor. Intermittent anoxic bottom‐water conditions caused by oxygen consumption during organic matter degradation favoured enhanced preservation of organic matter even under oxic–suboxic water column. Low sedimentation rate made the organic matter in sediments avoid dilution of terrigenous clastics, which made it play a positive role in the accumulation of organic matter.

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Section: Discussionmentioning

confidence: 99%

“…Accumulation model of organic matter during deposition of the Chang 7 shale, Ordos Basin (modified after He et al, ) [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Discussionmentioning

confidence: 99%

Palaeoproductivity and organic matter accumulation during the deposition of the Chang 7 organic‐rich shale of the Upper Triassic Yanchang Formation, Ordos Basin, China

et al. 2019

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“…Although the Late Triassic-Early Jurassic tectonothermal event in Ordos Basin has not been reported, it is believed that this tectonothermal event did occur and might only be distributed in the southwestern Ordos Basin. The reasons for this inference are as follows: 1) the partial annealed samples are just distributed in the southwestern Ordos Basin; 2) recent drilling discovered Late Triassic igneous rocks in the southwestern Ordos Basin; 3) 2D seismic interpretation found Late Triassic igneous intrusions; and 4) geochemical study suggested that the Late Triassic Yanchang Formation in the southwestern Ordos Basin received significant magmatic-hydrothermal input during deposition (He et al, 2016). Putting all these together, it is evident that during Late Triassic the southwestern Ordos Basin experienced a significant tectonothermal event, characterized by intense deep activity and thermal abnormality.…”

Section: Tectonic Significance Of the Prominent Zft Peak Age Populationsmentioning

confidence: 99%

“…of missing geologic time (Peters and Gaines, 2012;He et al, 2017;DeLucia et al, 2018). Erosion that formed the Great Unconformity has been causally linked to Rodinia breakup, Snowball Earth, and the Cambrian explosion (Peters and Gaines, 2012;Cox et al, 2016;He et al, 2016;DeLucia et al, 2018). Nevertheless, the timing and duration of denudation associated with formation of the Great Unconformity remain uncertain (He et al, 2017;DeLucia et al, 2018).…”

Section: Tectonic Significance Of the Prominent Zft Peak Age Populationsmentioning

confidence: 99%

Decoding Provenance and Tectonothermal Events by Detrital Zircon Fission‐Track and U‐Pb Double Dating: A Case of the Southern Ordos Basin

Zhang

Liu

Yang

et al. 2019

Acta Geologica Sinica (Eng)

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Multi‐dating on the same detrital grains allows for determining multiple different geo‐thermochronological ages simultaneously and thus could provide more details about regional tectonics. In this paper, we carried out detrital zircon fission‐track and U‐Pb double dating on the Permian‐Middle Triassic sediments from the southern Ordos Basin to decipher the tectonic information archived in the sediments of intracratonic basins. The detrital zircon U‐Pb ages and fission‐track ages, together with lag time analyses, indicate that the Permian‐Middle Triassic sediments in the southern Ordos Basin are characterized by multiple provenances. The crystalline basement of the North China Craton (NCC) and recycled materials from pre‐Permian sediments that were ultimately sourced from the basement of the NCC are the primary provenance, while the Permian magmatites in the northern margin of NCC and Early Paleozoic crystalline rocks in Qinling Orogenic Collage act as minor provenance. In addition, the detrital zircon fission‐track age peaks reveal four major tectonothermal events, including the Late Triassic‐Early Jurassic post‐depositional tectonothermal event and three other tectonothermal events associated with source terrains. The Late Triassic‐Early Jurassic (225–179 Ma) tectonothermal event was closely related to the upwelling of deep material and energy beneath the southwestern Ordos Basin due to the coeval northward subduction of the Yangze Block and the following collision of the Yangze Block and the NCC. The Mid‐Late Permian (275–263 Ma) tectonothermal event was associated with coeval denudation in the northern part of the NCC and North Qinling terrane, resulting from the subduction of the Paleo‐Asian Ocean and Tethys Ocean toward the NCC. The Late Devonian‐early Late Carboniferous (348±33 Ma) tectonothermal event corresponded the long‐term denudation in the hinterland and periphery of the NCC because of the arc‐continent collisions in the northern and southern margins of the NCC. The Late Neoproterozoic (813–565 Ma) tectonothermal event was associated with formation of the Great Unconformity within the NCC and may be causally related to the Rodinia supercontinent breakup driven by a large‐scale mantle upwelling.

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“…This paradox caused by geochemistry could be due to the trace elements, the contents of which are under different influences such as terrestrial input, type of organic matter or early diagenesis (Tribovillard et al 2006). In the Chang 7 period, there were strong tectonic movements due to the Qinling Mountain subduction, making Chang 7 be accompanied by hydrothermal activity (He et al 2016) and volcanic eruptions (Qiu et al 2009). Consequently, the geochemical indicators are not technically reliable to identify the sedimentary environment of the Chang 7 period, and thus the issue needs further discussion.…”

Section: Introductionmentioning

confidence: 99%

The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China

Zhu

Cui

et al. 2019

Pet. Sci.

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The organic-rich shale of the Chang 7 member is the most important source rock in the Ordos basin. The sedimentary environment and the controlling factors of organic matter enrichment, however, are still in contention. In this investigation, the Yishicun outcrop, located on the south margin of the Ordos basin, has been considered for the study. X-ray diffraction, polarizing microscopy, field emission scanning electron microscopy and cathodoluminescence (CL) were used to investigate the petrological features of the organic-rich shale. The content of volcanic ash and the diameter of pyrite framboid pseudocrystals were measured to illustrate the relationship between oxygen level, ash content and the enrichment of organic matter. It has been found that the diameter of pyrite framboid pseudocrystals has a strong correlation with the total organic carbon, demonstrating that the redox status degree of the water column has a positive impact on the enrichment of organic matter. Additionally, with an increase in the ash content, the content of organic matter increased at first and then decreased, and reached a maximum when the ash content was about 6%, illustrating that the ash input has a double effect on the enrichment of organic matter.

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Characteristics of hydrothermal sedimentation process in the Yanchang Formation, south Ordos Basin, China: Evidence from element geochemistry

Cited by 110 publications

References 40 publications

Palaeoproductivity and organic matter accumulation during the deposition of the Chang 7 organic‐rich shale of the Upper Triassic Yanchang Formation, Ordos Basin, China

Palaeoproductivity and organic matter accumulation during the deposition of the Chang 7 organic‐rich shale of the Upper Triassic Yanchang Formation, Ordos Basin, China

Decoding Provenance and Tectonothermal Events by Detrital Zircon Fission‐Track and U‐Pb Double Dating: A Case of the Southern Ordos Basin

The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China

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