Cited by 162Geological and Geochemical AnalysisPaleontology and Stratigraphy of FossilsGeochemistry and Geochronology of Asian Mineral Deposits

Further SHRIMP geochronology on the early Cambrian of South China

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Compston, W., Zhang, Z., Cooper, J. A., Ma, G., Jenkins, R.J.F.·2008·American Journal of Science

Abstract

Zircon ^206^Pb/^238^U ages are reported for bentonites from two Cambrian sections in South China, the Meishucun and the Fandian. The analyzed zircons vary widely in age because of the presence of detrital and altered grains. Spot ages were corrected for calibration drift during analysis, and the age of reference zircon SL13 was calibrated as 580 Ma against other standards using SIMS. Use of mixture modeling was essential to resolve the different age components and to identify the volcanic ages. Two age groups occur within the Meishucun Bed 5 bentonite, of which the larger at 518.7 ± 2.5 Ma (σ) is interpreted as a post depositional zircon growth event and the other at 539.4 ± 2.9 Ma as the volcanic age. Bentonites from the Meishucun Bed 9 and its Fandian equivalent have two age groups, 526.5 ± 1.1 Ma and 540.2 ± 1.0 Ma. We interpret the younger of these as the tuff magmatic age and the older as detrital. Small shelly fossils indicate Meischucunian Bed 5 is an equivalent of the late Nemakit Daldynian, and its 539.4 ± 2.9 Ma age both closely times the base of the Cambrian and is a maximum for the basal Tommotian. The 526.5 ± 1.1 Ma for Bed 9 and its equivalents approximates the close of the Tommotian.

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Crossref · 10.2475/04.2008.01

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  • A single preserved prominent positive peak from the same rising trend is present in the Watsonella crosbyi (SSF3) Assemblage Zone of the Middle Meishucunian Stage in South China and is older than 526.5 ± 1.1 Ma.

    “A single preserved prominent positive peak from the same rising trend is present in the Watsonella crosbyi (SSF3) Assemblage Zone of the Middle Meishucunian Stage in South China and is older than 526.5 ± 1.1 Ma”

    From Chronology of early Cambrian biomineralization (2012) · cites this paper as Compston et al . 2008

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Authors
Compston, W., Zhang, Z., Cooper, J. A., Ma, G., & Jenkins, R. J. F.
Affiliations
  • Australian National University (AU)
  • South Australian Museum (AU)
Corresponding author
Compston, W.
ORCID
Ma, G.
Venue
American Journal of Science
Published
2008-04-01
Volume
308
Issue
4
Pages
399-420
ISSN
0002-9599 (ISSN-L)
OpenAlex
W2005740401
Cited by
159
References
28
Citations by year
2026: 10 · 2025: 20 · 2024: 18 · 2023: 7 · 2022: 11 · 2021: 10 · 2020: 9 · 2019: 10 · 2018: 11 · 2017: 11 · 2016: 5 · 2015: 10 · 2014: 6 · 2013: 6 · 2012: 5
FWCI
3.01
Type
journal article
Language
en
Open access
Locations
  • American Journal of Science (publishedVersion)
  • Adelaide Research & Scholarship (AR&S) (University of Adelaide) (submittedVersion)
  • ANU Open Research (Australian National University) (submittedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Social Sciences › Economics, Econometrics and Finance › Economics and Econometrics › Geochemistry and Geochronology of Asian Mineral Deposits
Keywords
Lower Cambrian, zircon U-Pb geochronology, bentonite, South China, Tommotian, small shelly fossils, tuff, detrital zircon, Cambrian stratigraphy

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