Mafic volcanic rocks on King Island, Tasmania: evidence for 579 Ma break-up in east Gondwana
The eastern coast of King Island in southeastern Australia exposes a thick, well-preserved sequence of latest Neoproterozoic volcanic, and related shallow intrusive rocks. These rocks are associated with shallow marine carbonates and siltstones and pass up into massive conglomerates representing a m...
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ftunivtasecite:oai:ecite.utas.edu.au:32658 2023-05-15T17:34:16+02:00 Mafic volcanic rocks on King Island, Tasmania: evidence for 579 Ma break-up in east Gondwana Meffre, S Direen, N Crawford, AJ Kamenetsky, VS 2004 https://doi.org/10.1016/j.precamres.2004.08.004 http://ecite.utas.edu.au/32658 en eng Elsevier Science BV http://dx.doi.org/10.1016/j.precamres.2004.08.004 Meffre, S and Direen, N and Crawford, AJ and Kamenetsky, VS, Mafic volcanic rocks on King Island, Tasmania: evidence for 579 Ma break-up in east Gondwana, Precambrian Research, 135, (3) pp. 177-191. ISSN 0301-9268 (2004) [Refereed Article] http://ecite.utas.edu.au/32658 Earth Sciences Geology Igneous and Metamorphic Petrology Refereed Article PeerReviewed 2004 ftunivtasecite https://doi.org/10.1016/j.precamres.2004.08.004 2019-12-13T21:11:54Z The eastern coast of King Island in southeastern Australia exposes a thick, well-preserved sequence of latest Neoproterozoic volcanic, and related shallow intrusive rocks. These rocks are associated with shallow marine carbonates and siltstones and pass up into massive conglomerates representing a marine flooding event and unconformity, during continental break-up and subsequent volcanic passive margin formation. Unusual differentiated sills (Grimes Intrusive suite) with extreme internal variation (wehrlite to andesite compositions) intrude deformed Proterozoic metasediments of the Rodinian basement. A thin, basal tholeiitic basaltic volcanic unit (City of Melbourne Volcanics) is less contaminated than the underlying sills, and preceded eruption of a thick sequence of highly depleted picritic pillows, sub-aerial flows and hyaloclastites (Shower Droplet Volcanics). The picrite sequence is overlain by thick tholeiitic basalts and reworked volcanogenic conglomerates (Bold Head Formation) that show a strong compositional similarity to enriched mid ocean ridge basalts. Both the picrites and the upper tholeiitic basalts are not crustally contaminated and have an Nd-Sm isochron age of 579 16 Ma with initial Nd of +4.2. The lithostratigraphy and range of compositions represented are analogous to early magmatism associated with continental break-up and volcanic passive margin formation, including voluminous Seaward Dipping Reflector Sequences, in the Mesozoic North Atlantic volcanic margins. 2004 Elsevier B.V. All rights reserved. Article in Journal/Newspaper North Atlantic eCite UTAS (University of Tasmania) King Island ENVELOPE(-58.100,-58.100,-62.000,-62.000) Precambrian Research 135 3 177 191 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Geology Igneous and Metamorphic Petrology |
spellingShingle |
Earth Sciences Geology Igneous and Metamorphic Petrology Meffre, S Direen, N Crawford, AJ Kamenetsky, VS Mafic volcanic rocks on King Island, Tasmania: evidence for 579 Ma break-up in east Gondwana |
topic_facet |
Earth Sciences Geology Igneous and Metamorphic Petrology |
description |
The eastern coast of King Island in southeastern Australia exposes a thick, well-preserved sequence of latest Neoproterozoic volcanic, and related shallow intrusive rocks. These rocks are associated with shallow marine carbonates and siltstones and pass up into massive conglomerates representing a marine flooding event and unconformity, during continental break-up and subsequent volcanic passive margin formation. Unusual differentiated sills (Grimes Intrusive suite) with extreme internal variation (wehrlite to andesite compositions) intrude deformed Proterozoic metasediments of the Rodinian basement. A thin, basal tholeiitic basaltic volcanic unit (City of Melbourne Volcanics) is less contaminated than the underlying sills, and preceded eruption of a thick sequence of highly depleted picritic pillows, sub-aerial flows and hyaloclastites (Shower Droplet Volcanics). The picrite sequence is overlain by thick tholeiitic basalts and reworked volcanogenic conglomerates (Bold Head Formation) that show a strong compositional similarity to enriched mid ocean ridge basalts. Both the picrites and the upper tholeiitic basalts are not crustally contaminated and have an Nd-Sm isochron age of 579 16 Ma with initial Nd of +4.2. The lithostratigraphy and range of compositions represented are analogous to early magmatism associated with continental break-up and volcanic passive margin formation, including voluminous Seaward Dipping Reflector Sequences, in the Mesozoic North Atlantic volcanic margins. 2004 Elsevier B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Meffre, S Direen, N Crawford, AJ Kamenetsky, VS |
author_facet |
Meffre, S Direen, N Crawford, AJ Kamenetsky, VS |
author_sort |
Meffre, S |
title |
Mafic volcanic rocks on King Island, Tasmania: evidence for 579 Ma break-up in east Gondwana |
title_short |
Mafic volcanic rocks on King Island, Tasmania: evidence for 579 Ma break-up in east Gondwana |
title_full |
Mafic volcanic rocks on King Island, Tasmania: evidence for 579 Ma break-up in east Gondwana |
title_fullStr |
Mafic volcanic rocks on King Island, Tasmania: evidence for 579 Ma break-up in east Gondwana |
title_full_unstemmed |
Mafic volcanic rocks on King Island, Tasmania: evidence for 579 Ma break-up in east Gondwana |
title_sort |
mafic volcanic rocks on king island, tasmania: evidence for 579 ma break-up in east gondwana |
publisher |
Elsevier Science BV |
publishDate |
2004 |
url |
https://doi.org/10.1016/j.precamres.2004.08.004 http://ecite.utas.edu.au/32658 |
long_lat |
ENVELOPE(-58.100,-58.100,-62.000,-62.000) |
geographic |
King Island |
geographic_facet |
King Island |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://dx.doi.org/10.1016/j.precamres.2004.08.004 Meffre, S and Direen, N and Crawford, AJ and Kamenetsky, VS, Mafic volcanic rocks on King Island, Tasmania: evidence for 579 Ma break-up in east Gondwana, Precambrian Research, 135, (3) pp. 177-191. ISSN 0301-9268 (2004) [Refereed Article] http://ecite.utas.edu.au/32658 |
op_doi |
https://doi.org/10.1016/j.precamres.2004.08.004 |
container_title |
Precambrian Research |
container_volume |
135 |
container_issue |
3 |
container_start_page |
177 |
op_container_end_page |
191 |
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1766133054019993600 |