On the timing and forcing mechanism of a mid-Miocene arid climate transition at the NE margins of the Tibetan Plateau: stratigraphic and sedimentologic evidence from the Sikouzi Section

Lin, Xiubin; Wyrwoll, Karl-Heinz; Chen, Hanlin; Cheng, Xiaogan

doi:10.1007/s00531-015-1213-z

Cited by 9 publications

(9 citation statements)

References 39 publications

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“…Conclusively, the activation of tectonics in the Subei area since 13.7 Ma is the fundamental cause of the change of magnetic properties. This is in accordance with other reports concerning the uplift history of the northern Tibetan Plateau (Li JJ et al, 1997; Sun JM et al, 2005; Bovet et al, 2009; Li JF et al, 2014; Wang CS et al, 2014; Zhuang GS et al, 2014; Lin X et al, 2015; Lin XB et al, 2016; He PJ et al, 2018).…”

Section: Discussionsupporting

confidence: 93%

“…Stage II (17−14 Ma): the ratios of IRM 100mT /IRM 30mT , IRM 100mT /IRM 60mT , and IRM 100mT /SIRM show their highest values while the S ratio is at its minimum (Figure 5), indicating high values of the relative concentrations of hematite, thus the climate condition in this stage must be the warmest and the most humid of the Miocene. This warm phase corresponds to the MMCO (Miller et al, 1991; Wright et al, 1992; Flower and Kennett, 1994; Zachos et al, 2001; Sun JM and Zhang ZQ, 2008; Zan JB et al, 2015; Lin XB et al, 2016; Guan C et al, 2019). Stage III (14−9.7 Ma): decreasing ratios of IRM 100mT /IRM 30mT , IRM 100mT /IRM 60mT , and IRM 100mT /SIRM and increasing values of the S ratio are consistent with lower relative‐concentrations of hematite and thus suggestive of a weakening weathering process under a cooling climate.…”

Section: Discussionmentioning

confidence: 99%

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Paleoclimatic and provenance implications of magnetic parameters from the Miocene sediments in the Subei Basin

Sun

Zhang

et al. 2020

Earth and Planetary Physics

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Key Points:Variations of environmental magnetic parameters of the Miocene sediments were established in the Subei Basin q The increased bulk susceptibility, SIRM, ARM, and HIRM were related to tectonic uplift induced provenance change since 13.7 Ma q The parameters of susceptibility ratios, redness and S ratio are climate-dependent, indicating a warmest and humid climate during the middle Miocene Optimum q Abstract: Thick sediments from foreland basins usually provide valuable information for understanding the relationships between mountain building, rock denudation, and sediment deposition. In this paper, we report environmental magnetic measurements performed on the Miocene sediments in the Subei Basin, northeastern Tibetan Plateau. Our results show two different patterns. First, the bulk susceptibility and SIRM, ARM, and HIRM mainly reflect the absolute-concentration of magnetic minerals; all have increased remarkably since 13.7 Ma, related to provenance change rather than climate change. Second, the ratios of IRM 100mT /SIRM, IRM 100mT /IRM 30mT , and IRM 100mT /IRM 60mT , together with the redness and S ratio, reflect the relative-concentration of hematite, being climate-dependent. Their vertical changes correlate in general with the long-term Miocene climatic records of marine oxygen isotope variations, marked by the existence of higher ratios between 17 and 14 Ma. This may imply that global climate change, rather than uplift of the Tibetan Plateau, played a dominant role in the long-term climatic evolution of the Subei area from the early to middle Miocene.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Paleoclimatic and provenance implications of magnetic parameters from the Miocene sediments in the Subei Basin

Sun

Zhang

et al. 2020

Earth and Planetary Physics

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“…Our newly estimated divergence time coincides with the increasingly colder and arid climates following the mid‐Miocene Climatic Optimum (MMCO, c . 17–15 Ma; Pound et al ., 2012; Lin et al ., 2016). Likewise, we here established with high confidence that the Chinese and Japanese lineages of C .…”

Section: Discussionmentioning

confidence: 99%

Genomic insights on the contribution of balancing selection and local adaptation to the long‐term survival of a widespread living fossil tree, Cercidiphyllum japonicum

et al. 2020

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Summary ‘Living fossils’ are testimonies of long‐term sustained ecological success, but how demographic history and natural selection contributed to their survival, resilience, and persistence in the face of Quaternary climate fluctuations remains unclear. To better understand the interplay between demographic history and selection in shaping genomic diversity and evolution of such organisms, we assembled the whole genome of Cercidiphyllum japonicum, a widespread East Asian Tertiary relict tree, and resequenced 99 individuals of C. japonicum and its sister species, Cercidiphyllum magnificum (Central Japan). We dated this speciation event to the mid‐Miocene, and the intraspecific lineage divergence of C. japonicum (China vs Japan) to the Early Pliocene. Throughout climatic upheavals of the late Tertiary/Quaternary, population bottlenecks greatly reduced the genetic diversity of C. japonicum. However, this polymorphism loss was likely counteracted by, first, long‐term balancing selection at multiple chromosomal and heterozygous gene regions, potentially reflecting overdominance, and, second, selective sweeps at stress response and growth‐related genes likely involved in local adaptation. Our findings contribute to a better understanding of how living fossils have survived climatic upheaval and maintained an extensive geographic range; that is, both types of selection could be major factors contributing to the species' survival, resilience, and persistence.

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“…This combination has been abundantly applied in the southern Tibetan Plateau (e.g., Burbank et al, ; Finnegan et al, ; Thiede & Ehlers, ; Yang et al, ; Yu et al, ; Zeitler et al, ; Zhang et al, ) but limited in the endorheic Northwest China due to the modern arid environment. The lack of studies combining provenance, low‐temperature thermochronology, and morphological analyses leads to a widespread debate on the Cenozoic growth of the northern Tibetan Plateau (Figure ; e.g., Allen et al, ; Jolivet et al, , ; Tapponnier et al, ; Wang et al, , ; Dai et al, ; Wang et al, ; Yin, Dang, Wang, et al, , Yin, Dang, Zhang, et al, ; Liu et al, ; Liu et al, ; Clark et al, ; Zheng et al, , ; Clark, ; Lin et al, , ; Zhuang et al, , ; Jian et al, , ; Dai et al, ; Yuan et al, ; Yu, Fu, et al, , Yu, Huang, et al, ; Cheng et al, ; Zuza et al, ; Wei et al, ; Zhang et al, ; Li, Wu, & Yu, ; Li, Yan, et al, ; McRivette et al, ). For example, in the central segment of the northern Qaidam basin, researchers came to different conclusions using similar methods (e.g., Bush et al, ; Ji et al, ; Lu & Xiong, ; Wang et al, ; Zhuang et al, ).…”

Section: Introductionmentioning

confidence: 99%

Landscape and Tectonic Evolution of Bayin River Watershed, Northeastern Qaidam Basin, Northern Tibetan Plateau: Implications for the Role of River Morphology in Source Analysis and Low‐Temperature Thermochronology

Guo

Guan

et al. 2019

JGR Earth Surface

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The Bayin River, the largest river in the northeastern Qaidam basin, plays an important role in the source-to-sink system and landscape evolution at the basin-mountain boundary between the Qilian Mountains and the Qaidam basin in the northern Tibetan Plateau. In this study, we conduct field observation, topographic analysis, zircon U-Pb dating, and apatite (U-Th)/He dating to constrain the landscape and tectonic evolution of the Bayin River watershed. Bedrock zircon U-Pb dating indicates the age group of 420-450 Ma for far-source sediments and the age group of >1,700 Ma for near-source sediments in the Bayin River watershed. Detrital zircon U-Pb dating results from the Mesozoic and Cenozoic strata in the Bayin River watershed reveal that the most important source transition occurred during the Cretaceous. The Zongwulong Mountains gradually uplifted throughout the Cenozoic, along with decreasing far source and increasing near source based on detrital zircon U-Pb dating. Rapid uplift occurred across the Qilian Mountains during the late Cenozoic, leading to high normalized steepness indices, young apatite (U-Th)/He ages, and deep incised valleys at the basin-mountain transition zone. The knickpoints caused by the latest headward erosion just reach an elevation of~3,800 m on the river longitudinal profiles, indicating that the latest uplift magnitude is~300-400 m relative to the basin surface of the Qaidam basin. Elevation distribution and apatite (U-Th)/He ages reveal that river incision leads to high relief in the Zongwulong Mountains and influences its tectonic evolution. . Landscape and tectonic evolution of Bayin River watershed, northeastern Qaidam basin, northern Tibetan Plateau: Implications for the role of river morphology in source analysis and low-temperature thermochronology.

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On the timing and forcing mechanism of a mid-Miocene arid climate transition at the NE margins of the Tibetan Plateau: stratigraphic and sedimentologic evidence from the Sikouzi Section

Abstract: we explore this question in the context of regional-scale climate dynamics and propose that the onset of drier conditions over the study area was a response to atmospheric subsidence driven by circulation changes related to the growth of the Tibetan Plateau.

Cited by 9 publications

References 39 publications

Paleoclimatic and provenance implications of magnetic parameters from the Miocene sediments in the Subei Basin

Paleoclimatic and provenance implications of magnetic parameters from the Miocene sediments in the Subei Basin

Genomic insights on the contribution of balancing selection and local adaptation to the long‐term survival of a widespread living fossil tree, Cercidiphyllum japonicum

Landscape and Tectonic Evolution of Bayin River Watershed, Northeastern Qaidam Basin, Northern Tibetan Plateau: Implications for the Role of River Morphology in Source Analysis and Low‐Temperature Thermochronology

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