OSL and pollen concentrate 14C dating of dammed lake sediments at Maoxian, east Tibet, and implications for two historical earthquakes in AD 638 and 952

Xu, Hongyan; Jiang, Hanchao; Yu, Shi‐Yong; Yang, Haijun; Chen, Jie

doi:10.1016/j.quaint.2014.09.045

Cited by 36 publications

(35 citation statements)

References 63 publications

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“…The Diaolin chronology was generated with a combination of OSL and radiocarbon dates (Xu et al 2015). We collected eight samples for OSL analyses throughout the section by cleaning the exposed surface, inserting metal tubes into the outcrop, and placing the capped samples immediately into sealed black bags (Xu et al 2015).…”

Section: Methodsmentioning

confidence: 99%

“…We collected eight samples for OSL analyses throughout the section by cleaning the exposed surface, inserting metal tubes into the outcrop, and placing the capped samples immediately into sealed black bags (Xu et al 2015). OSL dating was conducted at the State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration (IGCEA).…”

Section: Methodsmentioning

confidence: 99%

“…The cosmic ray contribution to the dose rate was calculated from the burial depth and the altitude of the samples (Aitken 1998). Four new (this study) and four previously published (Xu et al 2015) OSL dates were combined to generate the initial chronology. To augment the OSL-based chronology, we include previously published pollen concentrate AMS 14 C dates from the base of the section (Tables 1, 2 ;Figs.…”

Section: Methodsmentioning

confidence: 99%

“…2a). The exposed section is underlain ([6.25 m) by a conglomerate layer of phyllite and overlain (0.93-0 m) by well-rounded sandy gravel (Xu et al 2015).…”

Section: Study Sitementioning

confidence: 99%

“…About 70-90 % of the regional precipitation falls between June and September in association with the EASM. During winter and spring, localized foehn winds, driven by the AWM, transport dust to the study area Tang et al 2013;Jiang et al 2014;Xu et al 2015). There is strong regional vegetation zonation with altitude, characterized by broadleaf and subalpine coniferous forests, arid valley shrubs, and subalpine meadows (Zhang et al 2007).…”

Section: Study Sitementioning

confidence: 99%

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Decadal- to centennial-scale East Asian summer monsoon variability during the Medieval Climate Anomaly reconstructed from an eastern Tibet lacustrine sequence

Jiang

Shevenell

et al. 2015

J Paleolimnol

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Instrumental data suggest changes in the intensity of the East Asian Monsoon system over the past century, possibly in response to anthropogenic climate change. To understand modern observations and explore past variations in East Asian summer monsoon (EASM) strength, we conducted grain size, geochemical, and pollen assemblage studies on a lacustrine sediment sequence from an earthquakedammed paleolake on the eastern Tibetan Plateau. The chronology, generated from eight optically stimulated luminescence and two pollen concentrate radiocarbon dates, indicates deposition of the lacustrine sequence between 600 and 1250 C.E. Fine grain sizes and low arboreal pollen percentages are associated with regional aridity (790-916, 1020-1080, 1125-1150 C.E.) and a weak EASM, whereas coarser grain sizes and higher arboreal pollen percentages are associated with increased precipitation and a stronger EASM (1090-1125, 1160-1230 C.E.). Although observed variations in our paleodata are predominantly driven by climate, the sequence is also influenced by regional tectonics, as evident from seismites, a *90-year hiatus (917-1004 C.E.) during a period of regional seismicity, and an abrupt increase in regional sedimentation rates. Human disturbance is also observed to increase during weak EASM intervals. On decadal to millennial scales, our paleodata are highly correlated with reconstructions of EASM strength from northeastern China and sea surface temperature reconstructions from the tropical Pacific Ocean, indicating that the Medieval Climate Anomaly was associated with a strong EASM and prolonged La Niña-like state. Our data also suggest decadal-scale EASM variability associated with solar intensity, but an inconsistent response suggests additional complexity in EASM forcing. The inverse relationship between modern EASM weakening with anthropogenic warming, and a strong EASM during the warm Medieval Climate Anomaly, suggests that the complexity of the decadal to centennial-scale EASM response may be related to changes in the mean state of the tropical Pacific Ocean.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…2a). The exposed section is underlain ([6.25 m) by a conglomerate layer of phyllite and overlain (0.93-0 m) by well-rounded sandy gravel (Xu et al 2015).…”

Section: Study Sitementioning

confidence: 99%

Section: Study Sitementioning

confidence: 99%

See 3 more Smart Citations

Decadal- to centennial-scale East Asian summer monsoon variability during the Medieval Climate Anomaly reconstructed from an eastern Tibet lacustrine sequence

Jiang

Shevenell

et al. 2015

J Paleolimnol

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A continuous 13.3-ka paleoseismic record constrains major earth- quake recurrence in the Longmen Shan collision zone

Shi

Jiang

Alsop

et al. 2021

Preprint

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Thrust collision zones with low slip rates along the plate boundary are significant areas of stress accumulation and prone to develop more destructive earthquakes with longer recurrence intervals. Such regions are often classified as low seismic risk if they lack continuous records of large earthquakes, such as the eastern Tibetan Plateau before the 2008 M w 7.9 Wenchuan earthquake. Here, we provide a continuous seismic record in the Longmen Shan thrust fault zone spanning 13,000 years based on detailed investigation of the soft-sediment deformation structures and seismites in the Lixian lacustrine sequence. The recurrence time of large earthquakes (M ≥ 8.1) is 1,200 years, which is significantly shorter than the previous estimate of 2,000-6,000 years. The Maoxian-Wenchuan fault is the main fault that triggered the deformation in the Lixian lacustrine sediments. In addition, earthquake recurrence in the warm period is more frequent than that in the cold period, which should arouse our attention for the seismic study of tectonically active regions.

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Electrical resistivity tomography revealing possible breaching mechanism of a Late Pleistocene long-lasted gigantic rockslide dam in Diexi, China

et al. 2023

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OSL and pollen concentrate 14C dating of dammed lake sediments at Maoxian, east Tibet, and implications for two historical earthquakes in AD 638 and 952

Cited by 36 publications

References 63 publications

Decadal- to centennial-scale East Asian summer monsoon variability during the Medieval Climate Anomaly reconstructed from an eastern Tibet lacustrine sequence

Decadal- to centennial-scale East Asian summer monsoon variability during the Medieval Climate Anomaly reconstructed from an eastern Tibet lacustrine sequence

A continuous 13.3-ka paleoseismic record constrains major earth- quake recurrence in the Longmen Shan collision zone

Electrical resistivity tomography revealing possible breaching mechanism of a Late Pleistocene long-lasted gigantic rockslide dam in Diexi, China

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