Climate change in the subtropical Paleo-Tethys before the late Ordovician glaciation
Zhang, Yuchen1,2,3; Tang, Peng(唐鹏)1; Jin, Jisuo3; Sun, Shuo3; Zhang, Xiaole(张晓蕾)1; Huang, Pu(黄璞)1; Sun, Jue(孙珏)1; Wang, Yi(王怿)1

The latest Katian (Late Ordovician) is marked by the third biodiversity climax of the Great Ordovician Biodiversification Event (GOBE) prior to the Late Ordovician mass extinction (LOME). In this study, the Chemical Index of Alteration (CIA) is used to determine the paleoenvironmental change recorded in the Arisu Member, the Siltstone Member, and the Sandstone Member of the Terekawat (= Tierekeawati) Formation (upper Katian) in the Tarim Basin, northwestern China. CIA values from these members are plotted in A-CN-K ternary diagrams respectively. Linear regression and 95% confidence interval estimation results indicate that these deposits were derived from the same parent rock, and the corrected CIA (CIA(corr).) values reveal significant paleo-climate changes during Late Ordovician. Sea-surface temperatures (SSTs) have been estimated by comparing 31 modern estuary systems. These data show that the CIA(corr)(.) values dropped from 77.41 to 64.83, corresponding to an interpreted temperature drop from 20.5 to 10.2 degrees C in the Dicellograptus complexus graptolite Biozone of the upper Katian (Ka-4). CIA(corr). values varied within a range of 67.63-70.16, implying temperature fluctuations between 12.5 and 14.6 degrees C in the lower to middle Paraorthograptus pacificus Biozone. CIA(corr). values rose again from 69.09 to 76.05, corresponding to a temperature rise from 13.7 to 19.4 degrees C in the upper Paraorthograptus pacificus graptolite Biozone of the latest Katian. This is interpreted to be a cooling and warming cycle, corresponding to the mid-Boda cooling and the late-Boda warming events. This study suggests that the climate change during late Katian was more intense than previous thought, especially in subtropical zones of Paleo-Tethys. This cooling event enhanced the thermohaline ocean circulation and became one of the major factors causing the well-known late Katian faunal dispersal (i.e. the Boda event). Hirnantian glaciation would have further promoted global oceanic cooling, over-stressed the ecosystems, and triggered the LOME.

KeywordChemical Index of Alteration (CIA) Tarim Basin Late Katian Mid-Boda cooling Confidence interval estimation
Indexed BySCI
Funding ProjectNational Natural Science Foundation of China[41872035] ; National Natural Science Foundation of China[41530103] ; National Natural Science Foundation of China[41972011] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB26000000] ; China Scholarship Council[201906340065] ; IGCP project[653]
WOS Research AreaPhysical Geography ; Geology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary
WOS IDWOS:000630930800002
Funding OrganizationNational Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; China Scholarship Council ; IGCP project
Document Type期刊论文
Corresponding AuthorZhang, Yuchen; Tang, Peng(唐鹏)
Affiliation1.Chinese Acad Sci, State Key Lab Palaeobiol & Stratig, Ctr Excellence Life & Paleoenvironm, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China
2.Univ Sci & Technol China, Hefei 230026, Peoples R China
3.Western Univ, London, ON N6A 3K7, Canada
Recommended Citation
GB/T 7714
Zhang, Yuchen,Tang, Peng,Jin, Jisuo,et al. Climate change in the subtropical Paleo-Tethys before the late Ordovician glaciation[J]. GLOBAL AND PLANETARY CHANGE,2021,199:8.
APA Zhang, Yuchen.,Tang, Peng.,Jin, Jisuo.,Sun, Shuo.,Zhang, Xiaole.,...&Wang, Yi.(2021).Climate change in the subtropical Paleo-Tethys before the late Ordovician glaciation.GLOBAL AND PLANETARY CHANGE,199,8.
MLA Zhang, Yuchen,et al."Climate change in the subtropical Paleo-Tethys before the late Ordovician glaciation".GLOBAL AND PLANETARY CHANGE 199(2021):8.
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