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Geochemical, biostratigraphic, and high-resolution geochronological constraints on the waning stage of Emeishan Large Igneous Province
Zhong, Yuting1; Mundil, Roland2; Chen, Jun1; Yuan, Dongxun (袁东勋)3,4; Denyszyn, Steven W.5; Jost, Adam B.6; Payne, Jonathan L.7; He, Bin1; Shen, Shuzhong (沈树忠)8; Xu, Yigang1
2020-09-01
Source PublicationGEOLOGICAL SOCIETY OF AMERICA BULLETIN
ISSN0016-7606
Volume132Issue:9-10Pages:1969-1986
Abstract

The initiation and peak magmatic periods of the Emeishan Large Igneous Province (LIP) are well constrained by both biostratigraphic and radioisotopic dating methods; however, the age of cessation of volcanism is poorly constrained and continues to be debated. Marine carbonates interbedded with volcanic ashes across the Guadalupian-Lopingian boundary (GLB) are widespread in south China, and these ashes provide an opportunity to study its timing, origin, and potential relationship with the Emeishan LIP. Here we present biostratigraphic constraints, mineralogical and geochemical characteristics, and high-resolution geochronology of ash layers from the Maoershan and Chaotian sections. Stratigraphic correlation, especially conodont biostratigraphy, confines these ashes to the early Wuchiapingian. Those altered ashes are geochemically akin to alkali tonsteins from the coal seams of the lower Xuanwei/Lungtan Formation in southwest China. The ashes postdating the GLB yield a coherent cluster of zircon U-Pb ages with weighted mean Pb-206/U-238 ages of 258.82 +/- 0.61 Ma to 257.39 +/- 0.68 Ma, in agreement with the ages of intrusive rocks (259.6 +/- 0.5 Ma to 257.6 +/- 0.5 Ma) in the central Emeishan LIP. Moreover, the epsilon(Hf(t)) values of zircons from the ashes vary from +2.5 to +10.6, a range consistent with that of the Emeishan LIP. The results collectively suggest that the early Wuchiapingian volcanic ashes are a product of extrusive alkaline magmatism and most likely mark the waning stage of the Emeishan volcanism, which may have continued until ca. 257.4 Ma in the early Wuchiapingian.

DOI10.1130/B35464.1
Indexed BySCI
Language英语
WOS KeywordZIRCON U-PB ; LATE PERMIAN COAL ; HF ISOTOPE CONSTRAINTS ; SW CHINA IMPLICATIONS ; SOUTH CHINA ; MASS EXTINCTION ; TRIASSIC BOUNDARY ; EASTERN YUNNAN ; CONODONT BIOSTRATIGRAPHY ; ALKALINE MAGMATISM
Funding ProjectStrategic -Priority Research Program (B) of the Chinese Academy of Sciences[XDB 18000000] ; National Science Foundation of China[41420104003] ; National Science Foundation of China[41403004]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000565754100011
Funding OrganizationStrategic -Priority Research Program (B) of the Chinese Academy of Sciences ; National Science Foundation of China
PublisherGEOLOGICAL SOC AMER, INC
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/32250
Collection中国科学院南京地质古生物研究所
Corresponding AuthorZhong, Yuting
Affiliation1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
2.Berkeley Geochronol Ctr, Berkeley, CA 94709 USA
3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, 39 East Beijing Rd, Nanjing 210008, Peoples R China
4.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, 39 East Beijing Rd, Nanjing 210008, Peoples R China
5.Univ Western Australia, Sch Earth Sci, Perth, WA 6009, Australia
6.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA
7.Stanford Univ, Dept Geol Sci, Stanford, CA 94305 USA
8.Nanjing Univ, Sch Earth Sci & Engn, Nanjing 210023, Peoples R China
Recommended Citation
GB/T 7714
Zhong, Yuting,Mundil, Roland,Chen, Jun,et al. Geochemical, biostratigraphic, and high-resolution geochronological constraints on the waning stage of Emeishan Large Igneous Province[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2020,132(9-10):1969-1986.
APA Zhong, Yuting.,Mundil, Roland.,Chen, Jun.,Yuan, Dongxun .,Denyszyn, Steven W..,...&Xu, Yigang.(2020).Geochemical, biostratigraphic, and high-resolution geochronological constraints on the waning stage of Emeishan Large Igneous Province.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,132(9-10),1969-1986.
MLA Zhong, Yuting,et al."Geochemical, biostratigraphic, and high-resolution geochronological constraints on the waning stage of Emeishan Large Igneous Province".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 132.9-10(2020):1969-1986.
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