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Ordovician reef and mound evolution : the Baltoscandian picture

KRÖGER, BJÖRN; HINTS, LINDA and LEHNERT, OLIVER LU (2016) In Geological Magazine p.1-24
Abstract

The widespread growth of reefs formed by a framework of biogenic constructors and frame-lacking carbonate mounds began on Baltica during Ordovician time. Previously, Ordovician reef and mound development on Baltica was considered to be sporadic and local. A review of all known bioherm localities across the Baltic Basin reveals a more consistent pattern. Ordovician bioherms grew in a wide E–W-aligned belt across the Baltic Basin and occur in several places in Norway. Substantial reef development began simultaneously across the region during the late Sandbian – early Katian interval and climaxed during the late Katian Pirgu age. The current spatiotemporal distribution of bioherms is a result of interdependent factors that involve original... (More)

The widespread growth of reefs formed by a framework of biogenic constructors and frame-lacking carbonate mounds began on Baltica during Ordovician time. Previously, Ordovician reef and mound development on Baltica was considered to be sporadic and local. A review of all known bioherm localities across the Baltic Basin reveals a more consistent pattern. Ordovician bioherms grew in a wide E–W-aligned belt across the Baltic Basin and occur in several places in Norway. Substantial reef development began simultaneously across the region during the late Sandbian – early Katian interval and climaxed during the late Katian Pirgu age. The current spatiotemporal distribution of bioherms is a result of interdependent factors that involve original drivers of reef development such as relative sea level, climate during the time of deposition and effects of post-depositional erosion. Oceanographic conditions were likely more favourable during times of cooler global climates, low sea level and glacial episodes. At the same time, the likelihood that bioherms are preserved from long-term erosion is higher when deposited during low sea level in deeper parts of the basin. A main factor controlling the timing of the reef and mound evolution was Baltica's shift toward palaeotropical latitudes during Late Ordovician time. The time equivalence between initial reef growth and the Guttenberg isotope carbon excursion (GICE) suggests that global climatic conditions were important.

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organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Baltoscandia, bioherm, carbonate platform, Great Ordovician Biodiversity Event (GOBE), mud mounds
in
Geological Magazine
pages
24 pages
publisher
Cambridge University Press
external identifiers
  • scopus:84973348807
  • wos:000402811500002
ISSN
0016-7568
DOI
10.1017/S0016756816000303
language
English
LU publication?
yes
id
001eccfb-2328-4543-96fb-0a43410a9402
date added to LUP
2017-01-24 10:37:15
date last changed
2017-10-22 05:25:27
@article{001eccfb-2328-4543-96fb-0a43410a9402,
  abstract     = {<p>The widespread growth of reefs formed by a framework of biogenic constructors and frame-lacking carbonate mounds began on Baltica during Ordovician time. Previously, Ordovician reef and mound development on Baltica was considered to be sporadic and local. A review of all known bioherm localities across the Baltic Basin reveals a more consistent pattern. Ordovician bioherms grew in a wide E–W-aligned belt across the Baltic Basin and occur in several places in Norway. Substantial reef development began simultaneously across the region during the late Sandbian – early Katian interval and climaxed during the late Katian Pirgu age. The current spatiotemporal distribution of bioherms is a result of interdependent factors that involve original drivers of reef development such as relative sea level, climate during the time of deposition and effects of post-depositional erosion. Oceanographic conditions were likely more favourable during times of cooler global climates, low sea level and glacial episodes. At the same time, the likelihood that bioherms are preserved from long-term erosion is higher when deposited during low sea level in deeper parts of the basin. A main factor controlling the timing of the reef and mound evolution was Baltica's shift toward palaeotropical latitudes during Late Ordovician time. The time equivalence between initial reef growth and the Guttenberg isotope carbon excursion (GICE) suggests that global climatic conditions were important.</p>},
  author       = {KRÖGER, BJÖRN and HINTS, LINDA and LEHNERT, OLIVER},
  issn         = {0016-7568},
  keyword      = {Baltoscandia,bioherm,carbonate platform,Great Ordovician Biodiversity Event (GOBE),mud mounds},
  language     = {eng},
  month        = {06},
  pages        = {1--24},
  publisher    = {Cambridge University Press},
  series       = {Geological Magazine},
  title        = {Ordovician reef and mound evolution : the Baltoscandian picture},
  url          = {http://dx.doi.org/10.1017/S0016756816000303},
  year         = {2016},
}