Accretion Rates of Meteorites and Cosmic Dust in the Early Ordovician-Reference-Cited by-同舟云学术

Accretion Rates of Meteorites and Cosmic Dust in the Early Ordovician

Published:1997-10-03 Issue:5335 Volume:278 Page:88-90
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Schmitz Birger¹²³⁴,Peucker-Ehrenbrink Bernhard¹²³⁴,Lindström Maurits¹²³⁴,Tassinari Mario¹²³⁴

Affiliation:

1. B. Schmitz, Department of Marine Geology, Earth Sciences Centre, University of Göteborg, S-413 81 Göteborg, Sweden.

2. B. Peucker-Ehrenbrink, Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution (WHOI), Woods Hole, MA 02543, USA.

3. M. Lindström, Department of Geology and Geochemistry, University of Stockholm, S-106 91 Stockholm, Sweden.

4. M. Tassinari, Paleo Geology Center, Fabriksgatan 4, S-531 30 Lidköping, Sweden.

Abstract

Abundant fossil meteorites in marine, condensed Lower Ordovician limestones from Kinnekulle, Sweden, indicate that accretion rates of meteorites were one to two orders of magnitude higher during an interval of the Early Ordovician than at present. Osmium isotope and iridium analyses of whole-rock limestone indicate a coeval enhancement of one order of magnitude in the influx rate of cosmic dust. Enhanced accretion of cosmic matter may be related to the disruption of the L chondrite parent body around 500 million years ago.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference27 articles.

1. Schmitz B., Lindström M., Asaro F., Tassinari M., Earth Planet. Sci. Lett. 145, 31 (1996).

2. Os isotope analyses were as described [

3. Hauri E. H., Hart S. R., ibid. 114, 353 (1993);

4. ] (8). Os was extracted from the samples by means of a NiS fire assay followed by distillation and a single ion-exchange resin bead clean-up step. Isotopic measurements were done by negative thermal ionization mass spectrometry at WHOI using the single-collector NIMA-B. Os data were blank-corrected using an average total procedural blank of 1.55 pg of Os per gram of fusion reagent with a mean 187 Os/ 186 Os ratio of 2.571. Re was measured on different sample splits by isotope dilution inductively coupled plasma–mass spectrometry at MIT. Typical uncertainties for Re concentrations are <5%.

5. Element results were obtained by instrumental neutron activation analysis (INAA) at ACTLABS Ontario [see (1)]. 87 Sr/ 86 Sr ratios were determined with a Finnigan MAT 261 mass spectrometer as described (B. Schmitz S. L. Ingram D. T. Dockery G. Åberg Chem. Geol. Isotope Geosci. in press).

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