A probable Early Triassic age for the Miers Bluff Formation, Livingston Island, South Shetland Islands
Fifteen samples of very low-grade mudstones from two widely separated sections in the Miers Bluff Formation on Hurd Peninsula yield an Rb-Sr errorchron (MSWD=8.9) corresponding to an age of 243 ± 8 Ma. This age is interpreted as representing effective homogenization, on a kilometres scale, during tu...
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Cambridge University Press
1994
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ftnerc:oai:nora.nerc.ac.uk:516575 2023-05-15T14:14:51+02:00 A probable Early Triassic age for the Miers Bluff Formation, Livingston Island, South Shetland Islands Willan, R. C. R. Pankhurst, R. J. Hervé, F. 1994-09 http://nora.nerc.ac.uk/id/eprint/516575/ https://doi.org/10.1017/S095410209400060X unknown Cambridge University Press Willan, R. C. R.; Pankhurst, R. J.; Hervé, F. 1994 A probable Early Triassic age for the Miers Bluff Formation, Livingston Island, South Shetland Islands. Antarctic Science, 6 (3). 401-408. https://doi.org/10.1017/S095410209400060X <https://doi.org/10.1017/S095410209400060X> Earth Sciences Publication - Article PeerReviewed 1994 ftnerc https://doi.org/10.1017/S095410209400060X 2023-02-04T19:44:39Z Fifteen samples of very low-grade mudstones from two widely separated sections in the Miers Bluff Formation on Hurd Peninsula yield an Rb-Sr errorchron (MSWD=8.9) corresponding to an age of 243 ± 8 Ma. This age is interpreted as representing effective homogenization, on a kilometres scale, during turbidite deposition and diagenesis in early Triassic times. The initial 87Sr/86Sr ratio 0.7085 ± 0.0003 represents a mature crustal source and is consistent with the re-working of material comparable to that eroded from the Chilean fore-arc accretionary complex. Four further samples, collected near to a zone of quartz-carbonate veins, lie to the right of the errorchron, with two samples having unusually low Sr contents. These samples fall on a 113 Ma reference line and indicate metasomatic disturbance in Cretaceous times. Metasomatism was probably related to hydrothermal alteration accompanying widespread silicification and quartz veining on western Hurd Peninsula. A mid-to late Cretaceous age for metasomatic disturbance agrees with field relations which indicate that the hydrothermal activity preceded or was coeval with the mid- to late Cretaceous period of volcanism on Livingston Island. Hence the hydrothermal rocks are not related to the Eocene Barnard Point pluton, as previously suggested. Article in Journal/Newspaper Antarctic Science Livingston Island South Shetland Islands Natural Environment Research Council: NERC Open Research Archive South Shetland Islands Livingston Island ENVELOPE(-60.500,-60.500,-62.600,-62.600) Miers ENVELOPE(163.850,163.850,-78.100,-78.100) Hurd ENVELOPE(-60.366,-60.366,-62.682,-62.682) Hurd peninsula ENVELOPE(-60.366,-60.366,-62.676,-62.676) Miers Bluff ENVELOPE(-60.438,-60.438,-62.720,-62.720) Antarctic Science 6 3 401 408 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Willan, R. C. R. Pankhurst, R. J. Hervé, F. A probable Early Triassic age for the Miers Bluff Formation, Livingston Island, South Shetland Islands |
topic_facet |
Earth Sciences |
description |
Fifteen samples of very low-grade mudstones from two widely separated sections in the Miers Bluff Formation on Hurd Peninsula yield an Rb-Sr errorchron (MSWD=8.9) corresponding to an age of 243 ± 8 Ma. This age is interpreted as representing effective homogenization, on a kilometres scale, during turbidite deposition and diagenesis in early Triassic times. The initial 87Sr/86Sr ratio 0.7085 ± 0.0003 represents a mature crustal source and is consistent with the re-working of material comparable to that eroded from the Chilean fore-arc accretionary complex. Four further samples, collected near to a zone of quartz-carbonate veins, lie to the right of the errorchron, with two samples having unusually low Sr contents. These samples fall on a 113 Ma reference line and indicate metasomatic disturbance in Cretaceous times. Metasomatism was probably related to hydrothermal alteration accompanying widespread silicification and quartz veining on western Hurd Peninsula. A mid-to late Cretaceous age for metasomatic disturbance agrees with field relations which indicate that the hydrothermal activity preceded or was coeval with the mid- to late Cretaceous period of volcanism on Livingston Island. Hence the hydrothermal rocks are not related to the Eocene Barnard Point pluton, as previously suggested. |
format |
Article in Journal/Newspaper |
author |
Willan, R. C. R. Pankhurst, R. J. Hervé, F. |
author_facet |
Willan, R. C. R. Pankhurst, R. J. Hervé, F. |
author_sort |
Willan, R. C. R. |
title |
A probable Early Triassic age for the Miers Bluff Formation, Livingston Island, South Shetland Islands |
title_short |
A probable Early Triassic age for the Miers Bluff Formation, Livingston Island, South Shetland Islands |
title_full |
A probable Early Triassic age for the Miers Bluff Formation, Livingston Island, South Shetland Islands |
title_fullStr |
A probable Early Triassic age for the Miers Bluff Formation, Livingston Island, South Shetland Islands |
title_full_unstemmed |
A probable Early Triassic age for the Miers Bluff Formation, Livingston Island, South Shetland Islands |
title_sort |
probable early triassic age for the miers bluff formation, livingston island, south shetland islands |
publisher |
Cambridge University Press |
publishDate |
1994 |
url |
http://nora.nerc.ac.uk/id/eprint/516575/ https://doi.org/10.1017/S095410209400060X |
long_lat |
ENVELOPE(-60.500,-60.500,-62.600,-62.600) ENVELOPE(163.850,163.850,-78.100,-78.100) ENVELOPE(-60.366,-60.366,-62.682,-62.682) ENVELOPE(-60.366,-60.366,-62.676,-62.676) ENVELOPE(-60.438,-60.438,-62.720,-62.720) |
geographic |
South Shetland Islands Livingston Island Miers Hurd Hurd peninsula Miers Bluff |
geographic_facet |
South Shetland Islands Livingston Island Miers Hurd Hurd peninsula Miers Bluff |
genre |
Antarctic Science Livingston Island South Shetland Islands |
genre_facet |
Antarctic Science Livingston Island South Shetland Islands |
op_relation |
Willan, R. C. R.; Pankhurst, R. J.; Hervé, F. 1994 A probable Early Triassic age for the Miers Bluff Formation, Livingston Island, South Shetland Islands. Antarctic Science, 6 (3). 401-408. https://doi.org/10.1017/S095410209400060X <https://doi.org/10.1017/S095410209400060X> |
op_doi |
https://doi.org/10.1017/S095410209400060X |
container_title |
Antarctic Science |
container_volume |
6 |
container_issue |
3 |
container_start_page |
401 |
op_container_end_page |
408 |
_version_ |
1766287224756764672 |