Cosmic spherules from Widerøefjellet, Sør Rondane Mountains (East Antarctica)
A newly discovered sedimentary accumulation of micrometeorites in the Sør Rondane Mountains of East Antarctica, close to the Widerøefjellet summit at ~2750 meter above sea level, is characterized in this work. The focus here lies on 2099 melted cosmic spherules larger than 200 μm, extracted from 3.2...
Published in: | Geochimica et Cosmochimica Acta |
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2020
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Online Access: | https://oro.open.ac.uk/68084/ https://oro.open.ac.uk/68084/1/Goderis%20et%20al.%20CS_depository.pdf https://oro.open.ac.uk/68084/8/68084.pdf https://doi.org/10.1016/j.gca.2019.11.016 |
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ftopenunivgb:oai:oro.open.ac.uk:68084 2023-06-11T04:07:14+02:00 Cosmic spherules from Widerøefjellet, Sør Rondane Mountains (East Antarctica) Goderis, Steven Soens, Bastien Huber, Matthew McKibben, Seann van Ginneken, Matthias Van Maldeghem, Flore Debaille, Vinciane Greenwood, Richard C. Franchi, Ian Cnudde, Veerle Van Malderen, Stijn Vanhaeke, Frank Koeberl, Christian Topa, Dan Claeys, Philippe 2020-02-01 application/pdf https://oro.open.ac.uk/68084/ https://oro.open.ac.uk/68084/1/Goderis%20et%20al.%20CS_depository.pdf https://oro.open.ac.uk/68084/8/68084.pdf https://doi.org/10.1016/j.gca.2019.11.016 unknown https://oro.open.ac.uk/68084/1/Goderis%20et%20al.%20CS_depository.pdf https://oro.open.ac.uk/68084/8/68084.pdf Goderis, Steven; Soens, Bastien; Huber, Matthew; McKibben, Seann; van Ginneken, Matthias; Van Maldeghem, Flore; Debaille, Vinciane; Greenwood, Richard C. <http://oro.open.ac.uk/view/person/rg839.html>; Franchi, Ian <http://oro.open.ac.uk/view/person/iaf2.html>; Cnudde, Veerle; Van Malderen, Stijn; Vanhaeke, Frank; Koeberl, Christian; Topa, Dan and Claeys, Philippe (2020). Cosmic spherules from Widerøefjellet, Sør Rondane Mountains (East Antarctica). Geochimica et Cosmochimica Acta, 270 pp. 112–143. Journal Item Public PeerReviewed 2020 ftopenunivgb https://doi.org/10.1016/j.gca.2019.11.016 2023-05-28T06:02:42Z A newly discovered sedimentary accumulation of micrometeorites in the Sør Rondane Mountains of East Antarctica, close to the Widerøefjellet summit at ~2750 meter above sea level, is characterized in this work. The focus here lies on 2099 melted cosmic spherules larger than 200 μm, extracted from 3.2 kg of sampled sediment. Although the Widerøefjellet deposit shares similarities to the micrometeorite traps encountered in the Transantarctic Mountains, both subtle and more distinct differences in the physicochemical properties of the retrieved extraterrestrial particles and sedimentary host deposits are discernable (e.g., types of bedrock, degree of wind exposure, abundance of metal-rich particles). Unlike the Frontier Mountain and Miller Butte sedimentary traps, the size fraction below 240 μm indicates some degree of sorting at Widerøefjellet, potentially through the redistribution by wind, preferential alteration of smaller particles, or processing biases. However, the cosmic spherules larger than 300 μm appear largely unbiased following their size distribution, frequency by textural type, and bulk chemical compositions. Based on the available bedrock exposure ages for the Sør Rondane Mountains, extraterrestrial dust is estimated to have accumulated over a time span of ~1 to 3 Ma at Widerøefjellet. Consequently, the Widerøefjellet collection reflects a substantial reservoir to sample the micrometeorite influx over this time interval. Petrographic observations and 3D microscopic CT imaging are combined with chemical and triple-oxygen isotopic analyses of silicate-rich cosmic spherules larger than 325 μm. The major element composition of 49 cosmic spherules confirms their principally chondritic parentage. For 18 glassy, 15 barred olivine, and 11 cryptocrystalline cosmic spherules, trace element concentrations are also reported on. Based on comparison with evaporation experiments reported in literature and accounting for siderophile and chalcophile element losses during high-density phase segregation and ejection, ... Article in Journal/Newspaper Antarc* Antarctica East Antarctica The Open University: Open Research Online (ORO) East Antarctica Frontier Mountain ENVELOPE(160.333,160.333,-72.983,-72.983) Miller Butte ENVELOPE(160.250,160.250,-72.700,-72.700) Sør Rondane Mountains ENVELOPE(25.000,25.000,-72.000,-72.000) Sør-Rondane ENVELOPE(25.000,25.000,-72.000,-72.000) Transantarctic Mountains Widerøefjellet ENVELOPE(23.259,23.259,-72.150,-72.150) Geochimica et Cosmochimica Acta 270 112 143 |
institution |
Open Polar |
collection |
The Open University: Open Research Online (ORO) |
op_collection_id |
ftopenunivgb |
language |
unknown |
description |
A newly discovered sedimentary accumulation of micrometeorites in the Sør Rondane Mountains of East Antarctica, close to the Widerøefjellet summit at ~2750 meter above sea level, is characterized in this work. The focus here lies on 2099 melted cosmic spherules larger than 200 μm, extracted from 3.2 kg of sampled sediment. Although the Widerøefjellet deposit shares similarities to the micrometeorite traps encountered in the Transantarctic Mountains, both subtle and more distinct differences in the physicochemical properties of the retrieved extraterrestrial particles and sedimentary host deposits are discernable (e.g., types of bedrock, degree of wind exposure, abundance of metal-rich particles). Unlike the Frontier Mountain and Miller Butte sedimentary traps, the size fraction below 240 μm indicates some degree of sorting at Widerøefjellet, potentially through the redistribution by wind, preferential alteration of smaller particles, or processing biases. However, the cosmic spherules larger than 300 μm appear largely unbiased following their size distribution, frequency by textural type, and bulk chemical compositions. Based on the available bedrock exposure ages for the Sør Rondane Mountains, extraterrestrial dust is estimated to have accumulated over a time span of ~1 to 3 Ma at Widerøefjellet. Consequently, the Widerøefjellet collection reflects a substantial reservoir to sample the micrometeorite influx over this time interval. Petrographic observations and 3D microscopic CT imaging are combined with chemical and triple-oxygen isotopic analyses of silicate-rich cosmic spherules larger than 325 μm. The major element composition of 49 cosmic spherules confirms their principally chondritic parentage. For 18 glassy, 15 barred olivine, and 11 cryptocrystalline cosmic spherules, trace element concentrations are also reported on. Based on comparison with evaporation experiments reported in literature and accounting for siderophile and chalcophile element losses during high-density phase segregation and ejection, ... |
format |
Article in Journal/Newspaper |
author |
Goderis, Steven Soens, Bastien Huber, Matthew McKibben, Seann van Ginneken, Matthias Van Maldeghem, Flore Debaille, Vinciane Greenwood, Richard C. Franchi, Ian Cnudde, Veerle Van Malderen, Stijn Vanhaeke, Frank Koeberl, Christian Topa, Dan Claeys, Philippe |
spellingShingle |
Goderis, Steven Soens, Bastien Huber, Matthew McKibben, Seann van Ginneken, Matthias Van Maldeghem, Flore Debaille, Vinciane Greenwood, Richard C. Franchi, Ian Cnudde, Veerle Van Malderen, Stijn Vanhaeke, Frank Koeberl, Christian Topa, Dan Claeys, Philippe Cosmic spherules from Widerøefjellet, Sør Rondane Mountains (East Antarctica) |
author_facet |
Goderis, Steven Soens, Bastien Huber, Matthew McKibben, Seann van Ginneken, Matthias Van Maldeghem, Flore Debaille, Vinciane Greenwood, Richard C. Franchi, Ian Cnudde, Veerle Van Malderen, Stijn Vanhaeke, Frank Koeberl, Christian Topa, Dan Claeys, Philippe |
author_sort |
Goderis, Steven |
title |
Cosmic spherules from Widerøefjellet, Sør Rondane Mountains (East Antarctica) |
title_short |
Cosmic spherules from Widerøefjellet, Sør Rondane Mountains (East Antarctica) |
title_full |
Cosmic spherules from Widerøefjellet, Sør Rondane Mountains (East Antarctica) |
title_fullStr |
Cosmic spherules from Widerøefjellet, Sør Rondane Mountains (East Antarctica) |
title_full_unstemmed |
Cosmic spherules from Widerøefjellet, Sør Rondane Mountains (East Antarctica) |
title_sort |
cosmic spherules from widerøefjellet, sør rondane mountains (east antarctica) |
publishDate |
2020 |
url |
https://oro.open.ac.uk/68084/ https://oro.open.ac.uk/68084/1/Goderis%20et%20al.%20CS_depository.pdf https://oro.open.ac.uk/68084/8/68084.pdf https://doi.org/10.1016/j.gca.2019.11.016 |
long_lat |
ENVELOPE(160.333,160.333,-72.983,-72.983) ENVELOPE(160.250,160.250,-72.700,-72.700) ENVELOPE(25.000,25.000,-72.000,-72.000) ENVELOPE(25.000,25.000,-72.000,-72.000) ENVELOPE(23.259,23.259,-72.150,-72.150) |
geographic |
East Antarctica Frontier Mountain Miller Butte Sør Rondane Mountains Sør-Rondane Transantarctic Mountains Widerøefjellet |
geographic_facet |
East Antarctica Frontier Mountain Miller Butte Sør Rondane Mountains Sør-Rondane Transantarctic Mountains Widerøefjellet |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_relation |
https://oro.open.ac.uk/68084/1/Goderis%20et%20al.%20CS_depository.pdf https://oro.open.ac.uk/68084/8/68084.pdf Goderis, Steven; Soens, Bastien; Huber, Matthew; McKibben, Seann; van Ginneken, Matthias; Van Maldeghem, Flore; Debaille, Vinciane; Greenwood, Richard C. <http://oro.open.ac.uk/view/person/rg839.html>; Franchi, Ian <http://oro.open.ac.uk/view/person/iaf2.html>; Cnudde, Veerle; Van Malderen, Stijn; Vanhaeke, Frank; Koeberl, Christian; Topa, Dan and Claeys, Philippe (2020). Cosmic spherules from Widerøefjellet, Sør Rondane Mountains (East Antarctica). Geochimica et Cosmochimica Acta, 270 pp. 112–143. |
op_doi |
https://doi.org/10.1016/j.gca.2019.11.016 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
270 |
container_start_page |
112 |
op_container_end_page |
143 |
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1768380215274242048 |