Mound‐forming cold‐water corals and bryozoans in the Early Palaeocene of Denmark
Abstract The Faxe Quarry in south‐east Denmark offers excellent exposures of Early Palaeocene, Danian deep‐water intercalated coral and bryozoan mounds that form complexes at least 40 m thick and a few kilometres wide along and over submarine highs. The coexisting coral and bryozoan mounds represent...
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crwiley:10.1111/sed.12424 2024-04-14T08:16:08+00:00 Mound‐forming cold‐water corals and bryozoans in the Early Palaeocene of Denmark Bjerager, Morten Sheldon, Emma Lauridsen, Bodil W. Brasier, Alexander Geocenter Danmark Carlsbergfondet 2017 http://dx.doi.org/10.1111/sed.12424 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fsed.12424 https://onlinelibrary.wiley.com/doi/pdf/10.1111/sed.12424 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Sedimentology volume 65, issue 4, page 1331-1353 ISSN 0037-0746 1365-3091 Stratigraphy Geology General Earth and Planetary Sciences General Environmental Science journal-article 2017 crwiley https://doi.org/10.1111/sed.12424 2024-03-19T11:01:14Z Abstract The Faxe Quarry in south‐east Denmark offers excellent exposures of Early Palaeocene, Danian deep‐water intercalated coral and bryozoan mounds that form complexes at least 40 m thick and a few kilometres wide along and over submarine highs. The coexisting coral and bryozoan mounds represent two different biogenic carbonate factories with a highly dynamic interplay during growth. The sedimentary facies, mound geometries and the density, diversity and palaeoecology of the associated benthic invertebrates and nannofossils allow recognition of six successive growth units. Unit 1 represents an outer shelf bryozoan mound belt characterized by an oligotrophic cool‐water nannofossil assemblage. Unit 2 comprises a mixed faunal assemblage of bryozoans and octocorals with an initial sparse colonization of hexacorals. The nannofossil assemblage records a decrease in diversity and an increase in warm water forms. Unit 3 marks the onset of dense colonization of the scleractinian coral Dendrophyllia candelabrum with associated low‐diversity macrofauna and nannofossil assemblages. Unit 4 represents the main coral build‐up phase with frame‐building hexacorals of Dendrophyllia and Faxephyllia associated with a high‐diversity invertebrate fauna, and relatively low‐diversity nannofossil assemblages. Unit 5 represents the late coral mound phase showing extensive lateral distribution and finally death and erosion of the coral mounds. This event was contemporaneous with a warming trend in the pelagic environment. The succeeding Unit 6 marks the burial and overgrowth of the coral mound complex by bryozoan‐rich sediments. The coral mound complex in the Faxe Quarry initiated and terminated in global nannofossil zone NP 3 and regional nannofossil zones NNT p2G–3 suggesting a mound growth duration of ca 300 kyr and a mean vertical accretion of the coral mound of 13 cm kyr −1 . The mound complex probably serves as the best‐exposed analogue to modern deep and cold‐water coral mounds in the North Atlantic. Article in Journal/Newspaper North Atlantic Wiley Online Library Sedimentology 65 4 1331 1353 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
topic |
Stratigraphy Geology General Earth and Planetary Sciences General Environmental Science |
spellingShingle |
Stratigraphy Geology General Earth and Planetary Sciences General Environmental Science Bjerager, Morten Sheldon, Emma Lauridsen, Bodil W. Mound‐forming cold‐water corals and bryozoans in the Early Palaeocene of Denmark |
topic_facet |
Stratigraphy Geology General Earth and Planetary Sciences General Environmental Science |
description |
Abstract The Faxe Quarry in south‐east Denmark offers excellent exposures of Early Palaeocene, Danian deep‐water intercalated coral and bryozoan mounds that form complexes at least 40 m thick and a few kilometres wide along and over submarine highs. The coexisting coral and bryozoan mounds represent two different biogenic carbonate factories with a highly dynamic interplay during growth. The sedimentary facies, mound geometries and the density, diversity and palaeoecology of the associated benthic invertebrates and nannofossils allow recognition of six successive growth units. Unit 1 represents an outer shelf bryozoan mound belt characterized by an oligotrophic cool‐water nannofossil assemblage. Unit 2 comprises a mixed faunal assemblage of bryozoans and octocorals with an initial sparse colonization of hexacorals. The nannofossil assemblage records a decrease in diversity and an increase in warm water forms. Unit 3 marks the onset of dense colonization of the scleractinian coral Dendrophyllia candelabrum with associated low‐diversity macrofauna and nannofossil assemblages. Unit 4 represents the main coral build‐up phase with frame‐building hexacorals of Dendrophyllia and Faxephyllia associated with a high‐diversity invertebrate fauna, and relatively low‐diversity nannofossil assemblages. Unit 5 represents the late coral mound phase showing extensive lateral distribution and finally death and erosion of the coral mounds. This event was contemporaneous with a warming trend in the pelagic environment. The succeeding Unit 6 marks the burial and overgrowth of the coral mound complex by bryozoan‐rich sediments. The coral mound complex in the Faxe Quarry initiated and terminated in global nannofossil zone NP 3 and regional nannofossil zones NNT p2G–3 suggesting a mound growth duration of ca 300 kyr and a mean vertical accretion of the coral mound of 13 cm kyr −1 . The mound complex probably serves as the best‐exposed analogue to modern deep and cold‐water coral mounds in the North Atlantic. |
author2 |
Brasier, Alexander Geocenter Danmark Carlsbergfondet |
format |
Article in Journal/Newspaper |
author |
Bjerager, Morten Sheldon, Emma Lauridsen, Bodil W. |
author_facet |
Bjerager, Morten Sheldon, Emma Lauridsen, Bodil W. |
author_sort |
Bjerager, Morten |
title |
Mound‐forming cold‐water corals and bryozoans in the Early Palaeocene of Denmark |
title_short |
Mound‐forming cold‐water corals and bryozoans in the Early Palaeocene of Denmark |
title_full |
Mound‐forming cold‐water corals and bryozoans in the Early Palaeocene of Denmark |
title_fullStr |
Mound‐forming cold‐water corals and bryozoans in the Early Palaeocene of Denmark |
title_full_unstemmed |
Mound‐forming cold‐water corals and bryozoans in the Early Palaeocene of Denmark |
title_sort |
mound‐forming cold‐water corals and bryozoans in the early palaeocene of denmark |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1111/sed.12424 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fsed.12424 https://onlinelibrary.wiley.com/doi/pdf/10.1111/sed.12424 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Sedimentology volume 65, issue 4, page 1331-1353 ISSN 0037-0746 1365-3091 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/sed.12424 |
container_title |
Sedimentology |
container_volume |
65 |
container_issue |
4 |
container_start_page |
1331 |
op_container_end_page |
1353 |
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1796314704781508608 |