NDLI: Evolution of strontium isotopic composition of seawater from Late Permian to Early Triassic based on study of marine carbonates, Zhongliang Mountain, Chongqing, China

Content Provider	Springer Nature Link
Author	Huang, SiJing Qing, HaiRuo Huang, PeiPei Hu, ZuoWei Wang, QingDong Zou, MingLiang Liu, HaoNian
Copyright Year	2008
Abstract	Collected from a Late Permian to Early Triassic sedimentary section in the Zhongliang Mountain of Chongqing, Southwest China, sixty marine carbonate samples were measured for the $^{87}$Sr/$^{86}$Sr ratios, and corresponding evolution curve was constructed. The concentrations of SiO$_{2}$, CaO, MgO, Mn and Sr are used to evaluate reservation of strontium isotopic composition for original seawater and the credibility of the dissolution method for sample preparation. The results show that most of the samples (except seven samples with the Mn/Sr ratios higher than 2) contain the original geochemistry signatures of ancient seawater. Compared to the published $^{87}$Sr/$^{86}$Sr ratios from the Late Permian to Early Triassic, our database reported here is the largest and the curve constructed is the most complete. The strontium isotopic curve from Late Permian to Early Triassic is consistent globally and exhibits a general trend of steady increase during this period. The minimum of $^{87}$Sr/$^{86}$Sr ratios (0.707011) occurs in the Late Permian (30 m in thickness below the Permian-Triassic boundary), and the maximum (0.708281), near the Early-Middle Triassic boundary. The lack of land plants and the rapid continental weathering result in the increase of $^{87}$Sr/$^{86}$Sr ratios during the interval. The Permian-Triassic boundary in Zhongliang Mountain Section has been accepted internationally. The $^{87}$Sr/$^{86}$Sr ratios of six samples near the boundary vary from 0.70714 to 0.70715 with an average of 0.70714, which is consistent with the value of 0.70715 (samples are from articulate brachiopod shells) from Korte et al. published in 2006 (within the error range in experiment). Accordingly, the strontium isotope composition in the Permian-Triassic boundary in this paper is of global significance. It can be confirmed that the $^{87}$Sr/$^{86}$Sr ratios of the seawater in the Permian-Triassic transition are in the range of 0.70714–0.70715.
Starting Page	528
Ending Page	539
Page Count	12
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	51
Issue Number	4
e-ISSN	18622801
Language	English
Publisher	SP Science in China Press
Publisher Date	2008-03-26
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	Zhongliang Mountain Chongqing Late Permian-Early Triassic paleoseawater strontium isotope composition Geosciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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