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Elevated flux of cosmic spherules (micrometeorites) in Ordovician rocks of the Durness Group, NW Scotland

Dredge, Ian; Parnell, John; Lindgren, Paula LU and Bowden, Stephen (2010) In Scottish Journal of Geology 46(1). p.7-16
Abstract

Limestone samples from the Cambro-Ordovician Durness Group were crushed, aciddigested and searched for evidence of micrometeorites. Eleven melted micrometeorites were extracted from the magnetic fraction of samples from the Balnakeil and Croisaphuill formations near the top of the group. Other formations in the Durness Group did not yield micrometeorites. Only melted spherules with a distinctive dendroidal crystalline structure (I-type cosmic spherules) were accepted as definite micrometeorites. They represent a flux of micrometeorites one to two orders of magnitude greater than at present. The micrometeoritebearing formations are of Arenig age, coincident with the onset of an enhanced flux of extraterrestrial material identified by the... (More)

Limestone samples from the Cambro-Ordovician Durness Group were crushed, aciddigested and searched for evidence of micrometeorites. Eleven melted micrometeorites were extracted from the magnetic fraction of samples from the Balnakeil and Croisaphuill formations near the top of the group. Other formations in the Durness Group did not yield micrometeorites. Only melted spherules with a distinctive dendroidal crystalline structure (I-type cosmic spherules) were accepted as definite micrometeorites. They represent a flux of micrometeorites one to two orders of magnitude greater than at present. The micrometeoritebearing formations are of Arenig age, coincident with the onset of an enhanced flux of extraterrestrial material identified by the occurrence of fossil meteorites in Sweden.

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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Scottish Journal of Geology
volume
46
issue
1
pages
10 pages
publisher
Geological Society of London
external identifiers
  • scopus:83155180132
ISSN
0036-9276
DOI
10.1144/0036-9276/01-394
language
English
LU publication?
no
id
f718d313-28b6-43e4-b14f-18c6e92a1267
date added to LUP
2017-06-26 09:54:39
date last changed
2018-05-29 10:28:35
@article{f718d313-28b6-43e4-b14f-18c6e92a1267,
  abstract     = {<p>Limestone samples from the Cambro-Ordovician Durness Group were crushed, aciddigested and searched for evidence of micrometeorites. Eleven melted micrometeorites were extracted from the magnetic fraction of samples from the Balnakeil and Croisaphuill formations near the top of the group. Other formations in the Durness Group did not yield micrometeorites. Only melted spherules with a distinctive dendroidal crystalline structure (I-type cosmic spherules) were accepted as definite micrometeorites. They represent a flux of micrometeorites one to two orders of magnitude greater than at present. The micrometeoritebearing formations are of Arenig age, coincident with the onset of an enhanced flux of extraterrestrial material identified by the occurrence of fossil meteorites in Sweden.</p>},
  author       = {Dredge, Ian and Parnell, John and Lindgren, Paula and Bowden, Stephen},
  issn         = {0036-9276},
  language     = {eng},
  number       = {1},
  pages        = {7--16},
  publisher    = {Geological Society of London},
  series       = {Scottish Journal of Geology},
  title        = {Elevated flux of cosmic spherules (micrometeorites) in Ordovician rocks of the Durness Group, NW Scotland},
  url          = {http://dx.doi.org/10.1144/0036-9276/01-394},
  volume       = {46},
  year         = {2010},
}