Skip to main content
×
Home
    • Aa
    • Aa

Oxygen and carbon isotope stratigraphy of early Cambrian carbonates in southeastern Newfoundland and England

  • M. D. Brasier (a1), M. M. Anderson (a2) and R. M. Corfield (a1)
Abstract
Abstract

Carbonate rocks have been sampled through predominantly siliciclastic sediments above the Precambrian-Cambrian global stratotype level in southeastern Newfoundland to assess their potential for oxygen and carbon isotope stratigraphy. Comparable successions were sampled at Nuneaton and Comley in England. Greatly depleted δ18O signals are attributed to widespread thermal alteration during deep burial and granitic intrusion, including within the stratotype region. Carbon isotope ratios appear to have been less affected and these are described from nine sections. A provisional, composite δ13C curve is based on non-ferroan, pink nodular and bedded micrites. Several δ13C excursions occur in the fossiliferous Bonavista Group and allow the position of the Tommotian-Atdabanian boundary to be identified. Chemostratigraphic correlation of the new Precambrian-Cambrian boundary stratotype may, however, prove difficult because of the lack of suitable, well-preserved carbonates. The search must begin for a comparable reference section allowing global correlation of the boundary level using chemostratigraphy as well as biostratigraphy.

Copyright
Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

K. Bell , J. Blenkinsop & D. F. Strong 1977. The geochronology of some granitic bodies from eastern Newfoundland and its bearing on Appalachian evolution. Canadian Journal of Earth Sciences 14, 456–76.

S. Bengtson & T. P. Fletcher 1983. The oldest sequence of skeletal fossils in the Lower Cambrian of south-eastern Newfoundland. Canadian Journal of Earth Sciences 20, 525–36.

M. D. Brasier 1980. The Lower Cambrian transgression and glauconite-phosphorite facies in western Europe. Journal of the Geological Society, London137, 695703.

R. M. Corfield , J. E. Cartlidge I. Premoli-Silva & R. A. Honsley 1991. Oxygen and carbon isotope stratigraphy of the Palaeogene and Cretaceous limestones in the Bottaccione Gorge and the Contessa Highway sections, Umbria, Italy. Terra Nova 3, 414–22.

B. H. Corliss 1985. Microhabitats of benthic foraminifera within deep-sea sediments. Nature 314, 435–8.

E. L. Grossman 1984. Stable isotope fractionation in live benthic foraminifera from the southern California borderland. Palaeogeography, Palaeoecology, Palaeoclimatology47, 301–27.

H. Irwin & C. Curtis 1977. Isotopic evidence for source of diagenetic carbonates formed during burial of organic-rich sediments. Nature 269, 209–13.

I. E. Krogh , D. F. Strong , S. J. O'brien & V. S. Papezik 1988. Precise U-Pb zircon dates from the Avalon Terrane in Newfoundland. Canadian Journal of Earth Sciences 25, 442–53.

M. J. le Bas 1972. Caledonian igneous rocks beneath central and eastern England. Proceedings of the Yorkshire Geological Society 39, 7184.

M. Magaritz , W. T. Holser & J. L. Kirschvink 1986. Carbon-isotope events across the Precambrian-Cambrian boundary on the Siberian Platform. Nature 320, 258–9.

J. D. Marshall & M. Ashton 1980. Isotopic and trace element evidence for submarine lithification of hard-grounds in the Jurassic of England. Sedimentology 27, 271–89.

M. Moczydlowska & G. Vidal 1988. How old is the Tommotian? Geology 16, 166–8.

O. M. Narbonne , P. M. Myrow , E. Landing & M. Anderson 1987. A candidate stratotype for the Precambrian-Cambrian boundary, Fortune Head, Burin Peninsula, southeastern Newfoundland. Canadian Journal of Earth Sciences 24, 1277–93.

N. Rast , B. H. O'brien & R. F. L. Wardle 1976. Relationships between Precambrian and Lower Palaeozoic rocks of the ‘Avalon Platform’ in New Brunswick, the northeast Appalachians and the British Isles. Tectonophysics 30, 315–38.

S. A. Smith & R. N. Hiscott 1984. Latest Precambrian to Early Cambrian basin evolution, Fortune Bay, New-foundland: fault-bounded basin to platform. Canadian Journal of Earth Sciences 21, 1379–92.

H. P. Taylor 1977. Water/rock interactions and the origin of H2O in granite batholiths. Journal of the Geological Society, London133, 509–58.

M. E. Tucker & V. P. Wright 1990. Carbonate Sedimentology. Oxford: Blackwell Scientific.

R. D. Tucker & T. C. Pharaoh 1991. U-Pb zircon ages for Late Precambrian igneous rocks in southern Britain. Journal of the Geological Society, London148, 435–44.

E. Vincent , J. S. Killingley & W. H. Berger 1981. Stable isotope composition of benthic foraminifera from the equatorial Pacific. Nature 289, 639–42.

D. F. Williams , I. Lerche & W. E. Full 1988. Isotope Chronostratigraphy, Theory and Methods. San Diego: Academic Press.

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Geological Magazine
  • ISSN: 0016-7568
  • EISSN: 1469-5081
  • URL: /core/journals/geological-magazine
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 6 *
Loading metrics...

Abstract views

Total abstract views: 57 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 26th March 2017. This data will be updated every 24 hours.