Pollen and fossil wood's linkage with Mi-1 Glaciation in northeastern Tibetan Plateau, China

Miao, Yunfa; Fang, Xiaomin; Song, Chunhui; Yan, Xiaoli; Xu, Li; Chen, Chuan-Fei

doi:10.1016/j.palwor.2013.06.001

Cited by 8 publications

(3 citation statements)

References 32 publications

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“…Previous studies of the basin have focused primarily on the sedimentology (Yin and Harrison, 2000;Wang et al, 2002;Zhou et al, 2002), tectonic evolution (Spurlin et al, 2005), tectonic-magmatic activity, and chronology (Yang and Wang, 1988;Deng et al, 2001;Spurlin et al, 2005;Zhu et al, 2006). Though only briefly mentioned regarding the Nangqian Basin, palynology has been extensively applied as a biostratigraphic tool for other petroleum-producing basins Zhang and Zhan, 1991;Gao et al, 2000) and to assess the changes in Cenozoic climate captured in the geological record of plateau basins of the TP, such as the Qaidam Basin (Xu et al, 1958;Zhu et al, 1985;Wang et al, 1999;Lu et al, 2010;Ji et al, 2011;Miao et al, 2011Miao et al, , 2012Miao et al, , 2013aCai et al, 2012;Herb et al, 2015;Wei et al, 2015), Jiuquan Basin (Miao et al, 2007;Zhang et al, 2015), Guide Basin (Pares et al, 2003), Lanzhou Basin (Flynn et al, 1999;Miao et al, 2013b), Xining-Minhe-Lanzhou Basin (Dupont-Nivet et al, 2008;Miao, 2010;Hoorn et al, 2012;Miao et al, 2013c;Bosboom et al, 2014), Hoh Xil Basin (Liu et al, 2003;Miao et al, 2016a), Tianshan Mountain (Chen et al, 2002;Sun et al, 2004), Tarim Basin (Sun et al, 1999;…”

Section: Geological Settingmentioning

confidence: 99%

A late Eocene palynological record from the Nangqian Basin, Tibetan Plateau: Implications for stratigraphy and paleoclimate

Qin

Vajda

et al. 2017

Palaeoworld

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With the uplifting, large-scale thrusting and striking of the Tibetan Plateau, several Paleogene intracontinental basins formed within the northern Tibetan Plateau (TP). Stratigraphical and paleoenvironmental studies of the sedimentary successions within these basins are critical for understanding Paleogene climatological changes in Eurasia. The Nangqian Basin, one of such basins, formed in the Yushu area of the northeastern Tibetan Plateau. A set of lacustrine sediments, dominated by red clasolite, marlite, and gypsum, developed in the Yang Ala section in this basin. Paleontological records from the Nangqian Basin remain poorly known. Here, we investigate the palynological assemblages of one sedimentary succession at the Yang Ala section that belongs to the Gongjue Formation, and their implications regarding the geological age and paleoclimate are discussed. The results reveal that the assemblages are dominated mainly by angiosperm pollen (tricolpates and tricolporate), including Nitrariadites (Pokrovskaja), Quercoidites, and Labitricolpites, followed by gymnosperm pollen taxa, such as Ephedripites and Taxodiaceaepollenites, and sparse pteridophyte spores produced by ferns. A late Eocene age is inferred based on palynostratigraphy and comparison with other pollen assemblages in the TP. A relatively dry climate with brief humid periods is indicated by the high abundance of xerophytic pollen taxa, such as Ephedripites and Nitrariadites, which are associated with broadleaved deciduous and evergreen plants. The characteristics of the pollen assemblages from the studied Yang Ala section are consistent with other Cenozoic palynofloras from the Mahalagou Formation in the Xining Basin and with those of the Yaxicuo Group in the Hoh Xil Basin. These results provide an improved stratigraphical scheme for parts of the Cenozoic and enrich the current knowledge of the vegetation history of the northeastern Tibetan Plateau.

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Section: Geological Settingmentioning

confidence: 99%

A late Eocene palynological record from the Nangqian Basin, Tibetan Plateau: Implications for stratigraphy and paleoclimate

Qin

Vajda

et al. 2017

Palaeoworld

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“…This result is completely opposite to the picture of the cryosphere depicted in the literature; i.e., a build-up of Antarctic ice sheets reaching the present-day volume or larger, but with an ice-free Arctic (Zachos et al, 2001;Pekar and DeConto, 2006;Liebrand et al, 2011;Mawbey and Lear, 2013). Terrestrial pollen data from Denmark (Śliwińska et al, 2014), northeastern Tibet (Miao et al, 2013), and the North American Atlantic coastal plain (Kotthoff et al, 2013) support our interpretation; they show the sudden and brief expansion of conifer forests during the Mi-1 event, indicating cooling of 2-4 °C in the NH highmiddle latitude regions. This supporting evidence, with our own results, calls for a forcing mechanism that was able to drive the significant NH cooling during this episode.…”

Section: Discussionmentioning

confidence: 73%

Southward shift of the Intertropical Convergence Zone due to Northern Hemisphere cooling at the Oligocene-Miocene boundary

Hyeong

Lee

Seo

et al. 2014

Geology

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The Mi-1 glaciation (ca. 23 Ma), which marks the Oligocene-Miocene boundary, was an aberrant cooling event that led to a build-up of the Antarctic ice sheet, which reached the near-modern volume (or greater) from its ephemeral or partial existence. An increase of ~1‰ in the d 18 O of benthic foraminifera during this interval has been attributed to the development of Antarctic ice sheets and deep-water cooling. Without definitive evidence, Northern Hemisphere (NH) glaciation has not been a material consideration for the d 18 O increase. Here we investigate the interhemispheric temperature contrast during Mi-1, with the movement of the Intertropical Convergence Zone (ITCZ) at a site (10°31′N) in the East Pacific (Integrated Ocean Drilling Program Site U1333), to understand NH cooling and the possibility of NH glaciation. The measured 143 Nd/ 144 Nd, 87 Sr/ 86 Sr, and clay mineral compositions of eolian dust fractions indicate unequivocally the deposition of Asian dust during Mi-1, and of Central American and South American dust before and after Mi-1. This is attributed to the southward displacement of the ITCZ over Site U1333 during Mi-1. The ITCZ shifts toward the warmer hemisphere. Thus our results suggest that the cooling during Mi-1 was more significant in the NH than in the Southern Hemisphere, which underwent a sudden expansion of continental ice sheets. Our data call for a forcing mechanism to drive significant NH cooling during this episode. Based on the available data, we propose that the widespread growth of NH ice sheets and/or changes in the production of North Atlantic-origin deep water could be possible causes of the NH cooling at that time.

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“…This most apparent explanation for the change of organic matter source at ~23 Ma is the Mi-1 Glaciation as revealed by the compiled oxygen isotope records (Zachos et al, 2001). Palynological results from the Xining Basin showed the cold-tolerant conifers shrived while thermophilic plants declined during the Mi-1 Glaciation at ~23 Ma (Miao et al, 2013a). While during the interval of ~18 to 14 Ma, the (C 17 -C 21 )/(C 27 -C 31 ) ratio and C 27 /C 31 value were decreasing, while the δ 13 C org values exhibited an opposite variation, which suggested that C 4 grasses gradually flourished when the warm and wet climate shifted to warm and dry conditions during the MMCO (Zachos et al, 2001;Westerhold et al, 2020).…”

Section: Comparison With Regional and Over-regional Paleoclimate Recordsmentioning

confidence: 99%

Paleoclimate Variations Spanning the Past 29–4 Ma Inferred From Lipid Biomarkers and Carbon Isotopes in the Linxia Basin, Northeast Tibetan Plateau

et al. 2022

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Thick and continuous deposits in the Linxia Basin, located in the landing area of westerlies and monsoons, offer a good opportunity for understanding the climatic evolution and tectonic activities. However, detailed paleoclimate reconstruction based on lipid biomarkers was rare, which limited our further knowledge, even though there were some relevant reports regarding pollen assemblages, microbial communities. In the present study, we conducted systematic analyses on the lipid biomarkers and carbon isotope values of the sediments, in an effort to reconstruct the evolution history of paleoclimate and figure out the potential driving mechanism. Our results showed that the organic matter was from mixed sources including lower organisms and terrestrial higher plants. The organic matter sources varied in response to the change of paleoclimate conditions as revealed by the lipid-derived proxies and organic carbon isotopes. Significant climatic events like late Oligocene Warming, Mid-Miocene Climatic Optimum and aridification at ∼8.5 Ma were observed throughout the sequence. Our results further indicated that the paleoclimate conditions in the study area primarily followed the pace of long-term global cooling, and the aridification at ∼8.5 Ma was associated with the uplift of the Tibetan Plateau.

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Pollen and fossil wood's linkage with Mi-1 Glaciation in northeastern Tibetan Plateau, China

Cited by 8 publications

References 32 publications

A late Eocene palynological record from the Nangqian Basin, Tibetan Plateau: Implications for stratigraphy and paleoclimate

A late Eocene palynological record from the Nangqian Basin, Tibetan Plateau: Implications for stratigraphy and paleoclimate

Southward shift of the Intertropical Convergence Zone due to Northern Hemisphere cooling at the Oligocene-Miocene boundary

Paleoclimate Variations Spanning the Past 29–4 Ma Inferred From Lipid Biomarkers and Carbon Isotopes in the Linxia Basin, Northeast Tibetan Plateau

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