Sedimentary record of climate change across the Eocene/Oligocene transition from the Qaidam Basin, northeastern Tibetan Plateau

Wang, Yadong; Shen, Yuan; Zuyi, Tao; Liu, Xiaoyan; Liu, Yongjiang; Miao, Yunfa

doi:10.1016/j.palaeo.2020.110203

Cited by 9 publications

(3 citation statements)

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“…Therefore, the enrichment of calcite cements and calcretes in the fluvial plain silts and muds of Unit 5 suggest that its lake margin has a low-gradient slope. Lacustrine-palustrine carbonates have also been widely found in the SYS Formation (Unit 5) of other regions in the Qaidam Basin (Wang et al, 2021). The common deficiency of calcite cements in the siliciclastic rocks of Unit 1 suggests a high-gradient lake margin.…”

Section: Discussionmentioning

confidence: 98%

“…This global cooling event has been widely recorded in the sediments of the Qaidam Basin (e.g. Wang et al, 2021;Wu et al, 2021;Yang et al, 2021). For example, leaf wax δ 2 H values of the Cenozoic deposits (Hongsanhan section) in the NW Qaidam Basin are lowest after the E/O transition, indicating a wetter climate during the Oligocene (Wu et al, 2021).…”

Section: On Carbonate Abundance and Lithofaciesmentioning

confidence: 89%

“…Owing to the asynchronous uplifting and thrusting of the periphery mountain ranges (Cheng et al, 2021; Yin et al, 2007), the depocenter(s) and perennial lake(s) of the Qaidam Basin changed location, geometry and size frequently (Bao et al, 2017; Guo et al, 2020; Guo, Liu, Huang, et al, 2018; Guo, Liu, Yu, et al, 2018; Li et al, 2016; Ma et al, 2017; Meng & Fang, 2008; Yin et al, 2008; Zhuang et al, 2011). Meanwhile, in response to the Cenozoic increasingly cooling global climates (Zachos et al, 2001) and regional dynamic climates with periodic shifts between dry and moist conditions (Rieser et al, 2009; Zhuang et al, 2014), the migrating lake(s) also experienced periodic expansion and shrinkage (Guo et al, 2020; Guo, Liu, Huang, et al, 2018; Guo, Liu, Yu, et al, 2018; Wang et al, 2021; Wu et al, 2021). As a result, the basin fills were dominated by mixtures of siliciclastic–carbonate–evaporite assemblages that are difficult to differentiating tectonic and climatic controls.…”

Section: Introductionmentioning

confidence: 99%

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Tectonic and climatic controls on carbonate sedimentation in active orogen proximal lakes, Cenozoic Qaidam Basin, northern Tibetan Plateau

Guo

Wen

et al. 2023

Basin Research

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Palustrine‐lacustrine carbonates of the well‐dated Xichagou section (ca. 43 to ca. 13 Ma) next to the active Altyn Tagh Fault (ATF) are investigated in terms of abundance, lithofacies, strontium, carbon and oxygen isotopes, to differentiate tectonic and climatic controls on the evolution of intermontane lakes in the Tibetan Plateau. Volumetrically dominant siliciclastic strata document five depositional stages: mid‐Eocene alluvial fan (onshore), late Eocene fan delta (nearshore), Oligocene semi‐deep lake (offshore), early Miocene braided fluvial delta (nearshore) and mid‐Miocene fluvial plain (onshore). Carbonates are most abundant in the middle three lacustrine stages and contain various lithofacies, including calcretes, microbialites, grainstones and marlstones. Oxygen isotopes show two positive excursions (−1.17‰ and −2.59‰) at the first nearshore and late offshore stages, indicating two relatively saline stages linked to the Eocene and late Oligocene global warming climates. Carbon isotopes show a positive excursion (from −4.0‰ to +2.9‰) at the middle semi‐deep lake stage and meanwhile strontium isotopes of carbonates show a large negative excursion (from 0.7120‰ to 0.7113‰), both in response to the early Oligocene global humid and cooling climate and resultant lake expansion at the Qaidam Basin. Except for this lake expansion event, the first‐order lake transgressing, shallowing and regressing evolution at the Xichagou section were not consistent with Cenozoic global climatic change trends. Instead, the two‐stage strike‐slip faulting of the ATF probably induced the northeastward and eastward migration of basin depocenter and resulted in the lake transgression‐regression at the Xichagou section. The widespread presence and relatively minor variation in oxygen isotopes (from −7.5‰ to −7.0‰) of early Miocene microbialites in the northern Tibetan Plateau suggest a warm climate and a low relief before ca. 15 Ma.

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Section: Discussionmentioning

confidence: 98%