Ordovician reef and mound evolution : the Baltoscandian picture

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http://hdl.handle.net/10138/308333

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Kröger , B , Hints , L & Lehnert , O 2017 , ' Ordovician reef and mound evolution : the Baltoscandian picture ' , Geological Magazine , vol. 154 , no. 4 , pp. 683-706 . https://doi.org/10.1017/S0016756816000303

Title: Ordovician reef and mound evolution : the Baltoscandian picture
Author: Kröger, Björn; Hints, Linda; Lehnert, Oliver
Contributor organization: Finnish Museum of Natural History
Natural Sciences Unit
Date: 2017-07
Language: eng
Number of pages: 24
Belongs to series: Geological Magazine
ISSN: 0016-7568
DOI: https://doi.org/10.1017/S0016756816000303
URI: http://hdl.handle.net/10138/308333
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 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.
Subject: carbonate platform
bioherm
mud mounds
Baltoscandia
Great Ordovician Biodiversity Event (GOBE)
DRILLCORE STANDARD SUCCESSION
CARBONATE MUD-MOUNDS
MIDDLE ORDOVICIAN
BALTIC SEA
NORTH-AMERICA
OSLO REGION
DELTA-C-13 CHEMOSTRATIGRAPHY
VASALEMMA FORMATION
WATER CONDITIONS
PLATFORM MARGIN
1171 Geosciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: closedAccess
Self-archived version: submittedVersion


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