Samples from the Lomonosov Ridge place new constraints on the geological evolution of the Arctic Ocean
A number of rock samples were collected from two dredge positions on the Lomonosov Ridge at water depths of 2–3.5 km. The dredge samples are dominated by sediments deformed and metamorphosed under greenschist-facies conditions 470 myr ago according to 40 Ar/ 39 Ar dating of metamorphic muscovite. Th...
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ftdatacite:10.6084/m9.figshare.c.3852151 2023-05-15T14:54:43+02:00 Samples from the Lomonosov Ridge place new constraints on the geological evolution of the Arctic Ocean C. Knudsen J. R. Hopper P. R. Bierman M. Bjerager T. Funck P. F. Green J. R. Ineson P. Japsen C. Marcussen S. C. Sherlock T. B. Thomsen 2017 https://dx.doi.org/10.6084/m9.figshare.c.3852151 https://figshare.com/collections/Samples_from_the_Lomonosov_Ridge_place_new_constraints_on_the_geological_evolution_of_the_Arctic_Ocean/3852151 unknown Figshare https://dx.doi.org/10.1144/sp460.17 CC BY 4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Geology FOS Earth and related environmental sciences Collection article 2017 ftdatacite https://doi.org/10.6084/m9.figshare.c.3852151 https://doi.org/10.1144/sp460.17 2021-11-05T12:55:41Z A number of rock samples were collected from two dredge positions on the Lomonosov Ridge at water depths of 2–3.5 km. The dredge samples are dominated by sediments deformed and metamorphosed under greenschist-facies conditions 470 myr ago according to 40 Ar/ 39 Ar dating of metamorphic muscovite. This shows that the Lomonosov Ridge was involved in a major Mid-Ordovician orogenic event that correlates with early arc–terrane accretion observed in northern Ellesmere Island, Svalbard, and other parts of the Caledonian belt. Detrital zircon age spectra of these metasediments span the Mesoproterozoic–Palaeoproterozoic with a main peak at around 1.6 Ga, and a pattern similar to that known from Caledonian metasedimentary rocks in East Greenland and northern Norway, as well as from Cambrian sediments in Estonia and Palaeozoic sediments on Novaya Zemlya. A second population of dredge samples comprises undeformed, non-metamorphic sandstones and siltstones. Detrital zircons in these sediments span the Palaeoproterozoic with a few Archaean zircons. Both rock types are covered by an up to 8 Ma ferromanganese crust and are evaluated to represent outcrop, and apatite fission-track data from three of the rock samples indicate that exposure at the seabed corresponds to a regional event of uplift and erosion that affected the Arctic in the Late Miocene. The data from the Lomonosov Ridge suggest that the 470 Ma orogenic event extended from Scotland and northern Scandinavia into the Arctic, including Svalbard, the Pearya Terrane and the Chukchi Borderlands. Article in Journal/Newspaper Arctic Arctic Ocean Chukchi East Greenland Ellesmere Island Greenland Lomonosov Ridge Northern Norway Novaya Zemlya Svalbard DataCite Metadata Store (German National Library of Science and Technology) Arctic Arctic Ocean Svalbard Ellesmere Island Greenland Norway |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geology FOS Earth and related environmental sciences |
spellingShingle |
Geology FOS Earth and related environmental sciences C. Knudsen J. R. Hopper P. R. Bierman M. Bjerager T. Funck P. F. Green J. R. Ineson P. Japsen C. Marcussen S. C. Sherlock T. B. Thomsen Samples from the Lomonosov Ridge place new constraints on the geological evolution of the Arctic Ocean |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
A number of rock samples were collected from two dredge positions on the Lomonosov Ridge at water depths of 2–3.5 km. The dredge samples are dominated by sediments deformed and metamorphosed under greenschist-facies conditions 470 myr ago according to 40 Ar/ 39 Ar dating of metamorphic muscovite. This shows that the Lomonosov Ridge was involved in a major Mid-Ordovician orogenic event that correlates with early arc–terrane accretion observed in northern Ellesmere Island, Svalbard, and other parts of the Caledonian belt. Detrital zircon age spectra of these metasediments span the Mesoproterozoic–Palaeoproterozoic with a main peak at around 1.6 Ga, and a pattern similar to that known from Caledonian metasedimentary rocks in East Greenland and northern Norway, as well as from Cambrian sediments in Estonia and Palaeozoic sediments on Novaya Zemlya. A second population of dredge samples comprises undeformed, non-metamorphic sandstones and siltstones. Detrital zircons in these sediments span the Palaeoproterozoic with a few Archaean zircons. Both rock types are covered by an up to 8 Ma ferromanganese crust and are evaluated to represent outcrop, and apatite fission-track data from three of the rock samples indicate that exposure at the seabed corresponds to a regional event of uplift and erosion that affected the Arctic in the Late Miocene. The data from the Lomonosov Ridge suggest that the 470 Ma orogenic event extended from Scotland and northern Scandinavia into the Arctic, including Svalbard, the Pearya Terrane and the Chukchi Borderlands. |
format |
Article in Journal/Newspaper |
author |
C. Knudsen J. R. Hopper P. R. Bierman M. Bjerager T. Funck P. F. Green J. R. Ineson P. Japsen C. Marcussen S. C. Sherlock T. B. Thomsen |
author_facet |
C. Knudsen J. R. Hopper P. R. Bierman M. Bjerager T. Funck P. F. Green J. R. Ineson P. Japsen C. Marcussen S. C. Sherlock T. B. Thomsen |
author_sort |
C. Knudsen |
title |
Samples from the Lomonosov Ridge place new constraints on the geological evolution of the Arctic Ocean |
title_short |
Samples from the Lomonosov Ridge place new constraints on the geological evolution of the Arctic Ocean |
title_full |
Samples from the Lomonosov Ridge place new constraints on the geological evolution of the Arctic Ocean |
title_fullStr |
Samples from the Lomonosov Ridge place new constraints on the geological evolution of the Arctic Ocean |
title_full_unstemmed |
Samples from the Lomonosov Ridge place new constraints on the geological evolution of the Arctic Ocean |
title_sort |
samples from the lomonosov ridge place new constraints on the geological evolution of the arctic ocean |
publisher |
Figshare |
publishDate |
2017 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.3852151 https://figshare.com/collections/Samples_from_the_Lomonosov_Ridge_place_new_constraints_on_the_geological_evolution_of_the_Arctic_Ocean/3852151 |
geographic |
Arctic Arctic Ocean Svalbard Ellesmere Island Greenland Norway |
geographic_facet |
Arctic Arctic Ocean Svalbard Ellesmere Island Greenland Norway |
genre |
Arctic Arctic Ocean Chukchi East Greenland Ellesmere Island Greenland Lomonosov Ridge Northern Norway Novaya Zemlya Svalbard |
genre_facet |
Arctic Arctic Ocean Chukchi East Greenland Ellesmere Island Greenland Lomonosov Ridge Northern Norway Novaya Zemlya Svalbard |
op_relation |
https://dx.doi.org/10.1144/sp460.17 |
op_rights |
CC BY 4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.3852151 https://doi.org/10.1144/sp460.17 |
_version_ |
1766326474207395840 |