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Preliminary Mo isotope data of Phanerozoic clastic sediments from the northern margin of the Yangtze block and its implication for paleoenvironmental conditions

Content Provider	Springer Nature Link
Author	Zhou, Lian Gao, Shan Chris, Hawkesworth Corey, Archer Xie, ShuCheng
Copyright Year	2008
Abstract	Mo isotopes along with Nd isotopes and other geochemical characteristics of the Phanerozoic clastic sediments from the northern margin of the Yangtze block were analyzed by MC-ICP-MS and some other techniques, spanning the period from Cambrian to Jurassic. The δ$^{98}$Mo values and ε$_{Nd}$(t) in these sedimets were observed to exhibit a large range of variation (−0.65‰2+1.87‰, −1.46–−10.90, respectively). Specifically, the sample from Late Permian Maokou Formation has relatively positive values in both δ$^{98}$Mo and ε$_{Nd}$(t) (+0.97‰, −1.46, respectively). These elevated values are proposed to relate to the input of a large quantity of H$_{2}$S and HS$^{−}$ into the contemporaneous seawater by the volcanic eruption of the Emeishan mantle plume. Introduction of these sulfide gases would cause MoO$_{4}$ $^{2−}$ to be transferred into MoS$_{4}$ $^{2−}$, favoring the preferential deposition of the heavy Mo isotope as MoS$_{4}$ $^{2−}$ and thus leaving a positive Mo isotope value. The sample from Late Permian Changxing Formation has a significantly elevated δ$^{98}$Mo value of +1.87‰, in association with the relatively negative ε$_{Nd}$(t) (−10.90) and remain the relatively higher content of both TOC and total sulfur (TS) (1.52%, 2.02%, respectively). This infers the presence of the enhanced primary productivity and high organic burial during the Changxing period. The production of a huge quantity of HS$^{−}$ and H$_{2}$S by the sulfate-reducing reaction led to the existence of the elevated seawater δ$^{98}$Mo values during the Changxing period. The preliminary Phanerozoic data reported here allow us to propose that the Mo isotope signature preserved in reductive sediments is related to the regional tectonic settings and the associated environmental conditions, and thus the measurement of δ$^{98}$Mo promotes our understanding on the evolution of the paleoenvironmental event in the Earth history.
Starting Page	822
Ending Page	829
Page Count	8
File Format	PDF
ISSN	10016538
Journal	Chinese Science Bulletin
Volume Number	54
Issue Number	5
e-ISSN	18619541
Language	English
Publisher	SP Science in China Press
Publisher Date	2008-11-22
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	molybdenum isotope clastic sediment paleoenvironmental event Engineering Earth Sciences Chemistry/Food Science Physics Life Sciences Science
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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