Astrochronology of the Middle Jurassic Buqu Formation (Tibet, China) and its implications for the Bathonian time scale

Cheng, Leli; Wang, Jian; Wan, Youli; Fu, Xiugen; Zhong, Liangxuanzi

doi:10.1016/j.palaeo.2017.08.018

Cited by 9 publications

(8 citation statements)

References 25 publications

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“…over 0.45 km/Ma. This accumulation rate is consistent with that obtained for the Buqu Formation at Well QZ11 (0.15–0.395 km/Ma with optimal value of 0.268 km/Ma, Cheng, Wang, Wan, Fu, & Zhong, ). The high accumulation rates in a short time interval resemble those for Andean hinterland basins (Horton, and references therein).…”

Section: Discussionsupporting

confidence: 90%

Subsidence and exhumation of the Mesozoic Qiangtang Basin: Implications for the growth of the Tibetan plateau

Zhang

Sinclair

et al. 2019

Basin Research

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The subsidence and exhumation histories of the Qiangtang Basin and their contributions to the early evolution of the Tibetan plateau are vigorously debated. This paper reconstructs the subsidence history of the Mesozoic Qiangtang Basin with 11 selected composite stratigraphic sections and constrains the first stage of cooling using apatite fission track data. Facies analysis, biostratigraphy, palaeo-environment interpretation and palaeo-water depth estimation are integrated to create 11 composite sections through the basin. Backstripped subsidence calculations combined with previous work on sediment provenance and timing of deformation show that the evolution of the

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Section: Discussionsupporting

confidence: 90%

Subsidence and exhumation of the Mesozoic Qiangtang Basin: Implications for the growth of the Tibetan plateau

Zhang

Sinclair

et al. 2019

Basin Research

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“…(2016), Huang (2018), Cheng et al. (2017), and our results (Table 1) suggest that the Laskar et al. (2004) solution is fairly robust for the Middle Jurassic.…”

Section: Geologic Setting Facies and Methodssupporting

confidence: 64%

“…Berger et al, 1989;Laskar et al, 2004) with percent uncertainties from Meyers et al (2012) and Waltham (2015). Although the astronomical solution >50 Ma has considerable uncertainty due to the apparent chaotic behavior of the solar system, Table 1 shows that published empirical data of Ikeda et al (2016), Huang (2018), Cheng et al (2017), and our results (Table 1) suggest that the Laskar et al (2004) solution is fairly robust for the Middle Jurassic. Conversion from stratigraphic position to floating time scale was done using estimated sedimentation rate to determine the wavelength (m) of the tuning cycle, in this case the metronomic 173 kyr cycle (Laskar, 2020).…”

Section: Time Series Analysismentioning

confidence: 62%

“…A dominant obliquity signal is evident in Bajocian‐Bathonian, color rank and chert abundance in deep water pelagic facies, Italy (Huang, 2018; Ikeda et al., 2016), and in gamma‐ray logs and resistivity logs of cyclic carbonate‐evaporite platform facies, China (Cheng et al., 2017). The abundant evidence for cool conditions and ice in the Bajocian‐Bathonian suggests that glacioeustasy drove sea level changes at the Milankovitch scale (Dera et al., 2011; Nunn & Price, 2010; Price, 1999; Ruebsam & Schark, 2021).…”

Section: Discussionmentioning

confidence: 99%

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Milankovitch Record From Middle Jurassic Platform Supports Moderate Coolhouse Glaciation

Husinec,

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2023

Paleoceanog and Paleoclimatol

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There are few documentations of far‐field effects of coolhouse glaciation and its signature preserved within Middle Jurassic carbonate platforms. Through outcrop logging and time series analysis we document the cyclostratigraphy of the upper Bajocian‐Bathonian interval of the Adriatic Platform, Croatia. The 200 m thick, ∼3.3 Myr duration cyclic platform record consists of peritidal carbonate parasequences (n = 109) with high‐energy grainstone‐rudstone bases fining up into micritic carbonate caps. There is little evidence of long‐term exposure near purported sequence boundaries, indicating the succession is conformable above the parasequence scale. Time series were constructed using Dunham rank and stratigraphic position, and parasequence thickness and stratigraphic position. A statistical estimation of accumulation rates using average spectral misfit (ASM) and correlation coefficient (COCO) methods that compare spectral peaks with an astronomical model at various sedimentation rates suggests that these rates ranged from 4.5 to 6 cm/kyr, which is compatible with long‐term rates based on thickness divided by duration. The time series analysis of rank series and cycle thickness series indicates long‐term obliquity modulation (∼1 Myr), short obliquity modulation (173 kyr), strong obliquity, and weak precession. The 173 kyr cycle is particularly evident in the cycle thickness series. The similarity of the spectra to the obliquity‐dominated Cenozoic coolhouse supports moderate southern hemisphere glaciation driving glacioeustatic sea level changes during the Middle Jurassic.

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“…In addition, study on the climatic changing during the Jurassic period in the Qiangtang Basin has been undertaken (Fang, Song, et al, 2016;Fang, Wu, et al, 2016;Han, Hu, Kemp, & Li, 2018). Milankovitch forcing in the Buqu Formation was also identified (Cheng, Wang, Wan, Fu, & Zhong, 2017).The QTKT1 well, which was drilled in 2016 in the Northern Qiangtang Depression by the Chengdu Center of the China Geological Survey, has allowed further studies of Jurassic environment and resources in the Eastern Tethys. The depth of this well is 4,696 m and it is the deepest well drilled in the Qiangtang Basin.…”

Section: Introductionmentioning

confidence: 99%

Demise of the Middle Jurassic carbonate platform: Responses to sea‐level fall in the Qiangtang Basin, Eastern Tethys

Gao

et al. 2020

Geological Journal

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Many studies have been focused on the development of carbonate platforms, however, the controlling factors of their evolution are still unclear. The QTKT1 well, drilled in 2016 by the Chengdu Center of the China Geological Survey at the Northern Qiangtang Depression, has allowed further studies of Jurassic environments and resources in the Eastern Tethys. In this study, we investigate variations in spectral gamma‐ray logs and CaCO3 content and perform a cyclostratigraphic analysis in the Xiali mudstones and Buqu limestones and Xiali mudstone to analyse causes for the demise of the Middle Jurassic carbonate platform in the Qiangtang Basin. The concentrations of Th, K, U, and Th/U and Th/K ratios increase suddenly from the Buqu Formation to the Xiali Formation, suggesting increased terrigenous input and/or decreased carbonate production rates. Cyclostratigraphic analysis detects the existence of astronomical cycles and an abrupt change in sediment accumulation rates within the target intervals. Combined with sedimentary facies analysis, our research suggests that the demise of the Middle Jurassic carbonate platform may have been caused by terrigenous detrital inputs into the Qiangtang Basin. High‐frequency sea‐level fluctuations increased terrestrial inputs and carbonate production rates at the orbital scale. The regression happened before the facies change and controlled terrestrial inputs at a larger scale, which resulted in the demise of the carbonate platforms. Contrary to the Western Tethys, a regression took place from the Bathonian to Callovian ages in the Qiangtang Basin, Eastern Tethys, which increased the exposure levels. The large exposure led to significant erosion, accelerated detrital input from the land to the Northern Qiangtang Depression, reduced carbonate production as well as resulted in the demise of the Buqu carbonate platform. The relative sea‐level fall is mainly the result of the regional tectonism during this period.

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Astrochronology of the Middle Jurassic Buqu Formation (Tibet, China) and its implications for the Bathonian time scale

Cited by 9 publications

References 25 publications

Subsidence and exhumation of the Mesozoic Qiangtang Basin: Implications for the growth of the Tibetan plateau

Subsidence and exhumation of the Mesozoic Qiangtang Basin: Implications for the growth of the Tibetan plateau

Milankovitch Record From Middle Jurassic Platform Supports Moderate Coolhouse Glaciation

Demise of the Middle Jurassic carbonate platform: Responses to sea‐level fall in the Qiangtang Basin, Eastern Tethys

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