Astronomical constraints on deposition of the Middle Triassic Chang 7 lacustrine shales in the Ordos Basin, Central China

Zhang, Rui; Jin, Zhijun; Liu, Quanyou; Huang, Zhenkai; Shi, Jingli; Ge, Yunjin; Du, Kefeng

doi:10.1016/j.palaeo.2019.04.030

Cited by 39 publications

(53 citation statements)

References 40 publications

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“…The South China block gradually converged with the North China Plate in the north and the Gondwana block group in the west, resulting in the Qinling-Dabie-Sulu orogenic belts (Deng et al, 2008;Wang et al, 2010;Chen et al, 2011). Zou et al, 2012;Yang and Deng, 2013;Yang et al, 2017;Zhang et al, 2019;. The map also shows the orogenic belts around the basin.…”

Section: Geologic Setting Tectonic Background In the Ordos Basinmentioning

confidence: 99%

“…The position of the studied well (An-35) and outcrop (MTG) are indicated by a red circle and star. (C) Lithology and division of the Yanchang Formation (Zhang et al, 2019 The Ordos Basin is a craton basin with an area of approximately 38 × 104 km 2 (Yang and Deng, 2013). The stratigraphic sequence thickness is about 4-5 km, which deposits from the Proterozoic to the Cenozoic (Zou et al, 2012).…”

Section: Geologic Setting Tectonic Background In the Ordos Basinmentioning

confidence: 99%

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Zircon U–Pb Dating of Tuff Layers in the Middle–Upper Triassic Strata of Successions and Sedimentation of Chang 7 Member in the Ordos Basin, China

Gou

Liu

et al. 2022

Front. Earth Sci.

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During the Late Triassic, the southern margin of the Ordos Basin was influenced by the Indosinian Movement, in response to closure of the Paleo-Tethys Ocean. Thinly bedded tuff layers are exposed near the base of the Middle–Upper Triassic formations (Chang 8/7/6 members) in the Ordos Basin. Tuff samples from drilling core (well An-35) and outcrop (Motiangou section) samples in the Yanchang Formation were studied by the detailed field work. Igneous zircon crystals were picked and analyzed by the instruments of cathodoluminescence and laser ablation inductively coupled plasma mass spectrometery (LA-ICP-MS). The timing of volcanic activity was determined by means of high-precision zircon age. Combining tectonic setting and paleogeographic reconstruct, the ages of tuff layers indicate that volcanic activities occurred at three peaks (241.6 ± 1.1 Ma, 240.2 ± 1.1 Ma, and 233.5 ± 1.2 Ma) from the top of Chang 8 Member to the Chang 7 Member. The results implied that the volcanic activities lasted from Ladinian to Carnian, as well as define the sedimentary duration of the Chang 7 Member with a deposition rate of 1.34 cm/ka.

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Section: Geologic Setting Tectonic Background In the Ordos Basinmentioning

confidence: 99%

Section: Geologic Setting Tectonic Background In the Ordos Basinmentioning

confidence: 99%

Zircon U–Pb Dating of Tuff Layers in the Middle–Upper Triassic Strata of Successions and Sedimentation of Chang 7 Member in the Ordos Basin, China

Gou

Liu

et al. 2022

Front. Earth Sci.

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“…The age for the lower boundary of the YC 7, obtained from zircon U-Pb radiometric dating of tuff layers, has been widely reported (Zhang et al, 2019). These ages include 241.3 AE 2.4 or 239.7 AE 1.7 Ma by zircon SHRIMP dating (Wang et al, 2014), 241.5 AE 0.074 or 241.4 AE 0.061 Ma by the CA-TIMS (chemical abrasion thermal ionization mass spectrometry) method (Liu et al, 2018) and 239.0 AE 1.8 Ma by the ID-TIMS (isotope dilution thermal ionization mass spectrometry) method (Deng et al, 2018).…”

Section: Extreme Flood Events Formed During the Carnian Pluvial Episodementioning

confidence: 99%

“…2A), and the seventh member of the Triassic Yanchang Formation (YC 7) consists primarily of lacustrine facies and contains well‐developed deep‐lake turbidites (Figs 1C and 2A). From the chronological studies in the Ordos Basin (Wang et al., 2014; Deng et al., 2018; Liu et al., 2018; Chen et al., 2019; Zhang et al., 2019), the YC 7 times correspond to the Ladinian–Carnian age (Fig. 2A), which was characterized by increased global humidity (Trotter et al., 2015; Bernardi et al., 2018; Dal Corso et al., 2018, 2020; Sun et al., 2019).…”

Section: The Triassic Ordos Basin and Stratigraphymentioning

confidence: 99%

A giant lacustrine flood‐related turbidite system in the Triassic Ordos Basin, China: Sedimentary processes and depositional architecture

Chen

Xian

et al. 2021

Sedimentology

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Turbidites have been regarded as an important sedimentary infilling component in both oceans and lakes, but limited studies have been performed on the mechanisms governing the initiation and development of lacustrine turbidite systems. The present study offers unique insight into the controls and potential extent of ancient lacustrine turbidite systems by an investigation of the Triassic Ordos Lake, where a large turbidite system had been traced across >25 653 km 2 . This article shows by comparison that the Triassic Ordos Lake turbidite system is larger than all known modern and ancient lacustrine counterparts. The exceptionally large intracontinental sag basin provided a relatively unconfined environment for the development of the turbidite system, explaining its vast extent. Extraordinary flood events formed during the Carnian Pluvial Episode facilitated continuous sediment supply into the turbidite system, supporting its accumulation. Lacustrine flood-related turbidity currents travelled as sediment-laden turbulent flows, showing an increase in the proportion of suspended-load deposits and a decrease in the proportion of bed-load deposits downstream from the river mouth. Five architectural elements have been revealed, reflecting a distinctive assemblage of erosional bedforms and depositional bedforms in channel-lobe systems, and their recognition criteria were established. This study changes the traditional understanding of lacustrine turbidite systems, generally interpreted as having smaller sizes, and demonstrates likewise in the lacustrine realm, that extreme flood events can generate a world-class deep-water turbidite system, which can even be comparable with its submarine counterparts. This study also confirms that the combination of lowgradient slopes and a long-lived, mixed-load, prograding fluvial feeder system can produce exceptionally large-scale deep-lake flood-related turbidites. Furthermore, it has implications for the prediction of facies and reservoir quality in ancient lacustrine turbidite systems.

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“…MS is a measure of the degree of magnetization of a material in response to an applied magnetic field and reflects the abundance of paramagnetic minerals (e.g., Fe-oxides) in the sediment as a function of composition and a potential proxy for climate change. MS has proven a powerful tool in studies of astronomical cyclicity and terrestrial paleoclimate (Wu et al, 2013;Zhang et al, 2019). Magnetic measurements were made at the outcrop with a ca.…”

Section: Magnetic Measurementsmentioning

confidence: 99%

Supplemental Material: Climate forcing of terrestrial carbon sink during the Middle Jurassic greenhouse climate: Chronostratigraphic analysis of the Yan’an Formation, Ordos Basin, North China

Zhang¹,

Wang²,

al.³

2020

Preprint

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Astronomical constraints on deposition of the Middle Triassic Chang 7 lacustrine shales in the Ordos Basin, Central China

Cited by 39 publications

References 40 publications

Zircon U–Pb Dating of Tuff Layers in the Middle–Upper Triassic Strata of Successions and Sedimentation of Chang 7 Member in the Ordos Basin, China

Zircon U–Pb Dating of Tuff Layers in the Middle–Upper Triassic Strata of Successions and Sedimentation of Chang 7 Member in the Ordos Basin, China

A giant lacustrine flood‐related turbidite system in the Triassic Ordos Basin, China: Sedimentary processes and depositional architecture

Supplemental Material: Climate forcing of terrestrial carbon sink during the Middle Jurassic greenhouse climate: Chronostratigraphic analysis of the Yan’an Formation, Ordos Basin, North China

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