The role of crustal and mantle sources in the genesis of granitoids of the Antarctic Peninsula and adjacent crustal blocks
Magmatic rocks from the Antarctic Peninsula show marked variations in isotope composition, which reflect changes in the geodynamic evolution of the peninsula through time. Most Antarctic Peninsula granitoids formed as a result of subduction: they fall on well-defined trends on plots of Nd, Pb-207/Pb...
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ftuglasgow:oai:eprints.gla.ac.uk:603 2024-06-02T07:55:44+00:00 The role of crustal and mantle sources in the genesis of granitoids of the Antarctic Peninsula and adjacent crustal blocks Millar, I.L. Willan, R.C.R. Wareham, C.D. Boyce, A.J. 2001 text https://eprints.gla.ac.uk/603/ https://eprints.gla.ac.uk/603/1/Journ_Geol_Soc_158%285%29_855-867.pdf http://www.ingentaconnect.com/content/geol/jgs;jsessionid=2c0c3b2lngepy.henrietta? en eng Geological Society https://eprints.gla.ac.uk/603/1/Journ_Geol_Soc_158%285%29_855-867.pdf Millar, I.L., Willan, R.C.R., Wareham, C.D. and Boyce, A.J. <http://eprints.gla.ac.uk/view/author/1919.html> (2001) The role of crustal and mantle sources in the genesis of granitoids of the Antarctic Peninsula and adjacent crustal blocks. Journal of the Geological Society <https://eprints.gla.ac.uk/view/journal_volume/Journal_of_the_Geological_Society.html>, 158(5), pp. 855-867. QE Geology Articles PeerReviewed 2001 ftuglasgow 2024-05-06T14:55:59Z Magmatic rocks from the Antarctic Peninsula show marked variations in isotope composition, which reflect changes in the geodynamic evolution of the peninsula through time. Most Antarctic Peninsula granitoids formed as a result of subduction: they fall on well-defined trends on plots of Nd, Pb-207/Pb-204 and delta O-18 against Sr-87/Sr-86(i). between a component derived from subduction-modified mantle or juvenile basaltic underplate (epsilon Nd-i gt 6, Pb-207/Pb-204=15.61, delta O-18=5.5 parts per thousand, Sr-87/Sr-86 lt 0.704) and an end- member interpreted as a melt of Proterozoic lower crust (epsilon Nd=-7, Pb-207/Pb-204=15.67, delta O-18=10 parts per thousand, Sr-87/Sr-86=0.709). A small group of granitoids. emplaced before or during Gondwana break-up, plot on distinct trends towards high Sr-87/Sr-86(i) compositions. reflecting mixing between melts derived from Proterozoic lower crust and melts of middle-upper crustal rocks (epsilon Nd-i=-9, Pb- 207/Pb-204=15.64, delta O-18=10 parts per thousand, Sr-87/Sr- 86=0.726). with little or no input of new material derived from the mantle or from juvenile basaltic underplate. These granitoids are thought to have formed as a result of crustal attenuation during the initial rifting phase of Gondwana break- up. Similar trends are shown by data from granitoids of the adjacent crustal blocks of West Antarctica, The isotope data suggest that an enriched Ferrar/Karoo-type lithosphere was not involved in the genesis of granitoids of the Antarctic Peninsula or of the Ellsworth-Whitmore Mountains crustal block. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica West Antarctica University of Glasgow: Enlighten - Publications Antarctic The Antarctic Antarctic Peninsula West Antarctica Whitmore Mountains ENVELOPE(-104.000,-104.000,-82.500,-82.500) |
institution |
Open Polar |
collection |
University of Glasgow: Enlighten - Publications |
op_collection_id |
ftuglasgow |
language |
English |
topic |
QE Geology |
spellingShingle |
QE Geology Millar, I.L. Willan, R.C.R. Wareham, C.D. Boyce, A.J. The role of crustal and mantle sources in the genesis of granitoids of the Antarctic Peninsula and adjacent crustal blocks |
topic_facet |
QE Geology |
description |
Magmatic rocks from the Antarctic Peninsula show marked variations in isotope composition, which reflect changes in the geodynamic evolution of the peninsula through time. Most Antarctic Peninsula granitoids formed as a result of subduction: they fall on well-defined trends on plots of Nd, Pb-207/Pb-204 and delta O-18 against Sr-87/Sr-86(i). between a component derived from subduction-modified mantle or juvenile basaltic underplate (epsilon Nd-i gt 6, Pb-207/Pb-204=15.61, delta O-18=5.5 parts per thousand, Sr-87/Sr-86 lt 0.704) and an end- member interpreted as a melt of Proterozoic lower crust (epsilon Nd=-7, Pb-207/Pb-204=15.67, delta O-18=10 parts per thousand, Sr-87/Sr-86=0.709). A small group of granitoids. emplaced before or during Gondwana break-up, plot on distinct trends towards high Sr-87/Sr-86(i) compositions. reflecting mixing between melts derived from Proterozoic lower crust and melts of middle-upper crustal rocks (epsilon Nd-i=-9, Pb- 207/Pb-204=15.64, delta O-18=10 parts per thousand, Sr-87/Sr- 86=0.726). with little or no input of new material derived from the mantle or from juvenile basaltic underplate. These granitoids are thought to have formed as a result of crustal attenuation during the initial rifting phase of Gondwana break- up. Similar trends are shown by data from granitoids of the adjacent crustal blocks of West Antarctica, The isotope data suggest that an enriched Ferrar/Karoo-type lithosphere was not involved in the genesis of granitoids of the Antarctic Peninsula or of the Ellsworth-Whitmore Mountains crustal block. |
format |
Article in Journal/Newspaper |
author |
Millar, I.L. Willan, R.C.R. Wareham, C.D. Boyce, A.J. |
author_facet |
Millar, I.L. Willan, R.C.R. Wareham, C.D. Boyce, A.J. |
author_sort |
Millar, I.L. |
title |
The role of crustal and mantle sources in the genesis of granitoids of the Antarctic Peninsula and adjacent crustal blocks |
title_short |
The role of crustal and mantle sources in the genesis of granitoids of the Antarctic Peninsula and adjacent crustal blocks |
title_full |
The role of crustal and mantle sources in the genesis of granitoids of the Antarctic Peninsula and adjacent crustal blocks |
title_fullStr |
The role of crustal and mantle sources in the genesis of granitoids of the Antarctic Peninsula and adjacent crustal blocks |
title_full_unstemmed |
The role of crustal and mantle sources in the genesis of granitoids of the Antarctic Peninsula and adjacent crustal blocks |
title_sort |
role of crustal and mantle sources in the genesis of granitoids of the antarctic peninsula and adjacent crustal blocks |
publisher |
Geological Society |
publishDate |
2001 |
url |
https://eprints.gla.ac.uk/603/ https://eprints.gla.ac.uk/603/1/Journ_Geol_Soc_158%285%29_855-867.pdf http://www.ingentaconnect.com/content/geol/jgs;jsessionid=2c0c3b2lngepy.henrietta? |
long_lat |
ENVELOPE(-104.000,-104.000,-82.500,-82.500) |
geographic |
Antarctic The Antarctic Antarctic Peninsula West Antarctica Whitmore Mountains |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula West Antarctica Whitmore Mountains |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica West Antarctica |
op_relation |
https://eprints.gla.ac.uk/603/1/Journ_Geol_Soc_158%285%29_855-867.pdf Millar, I.L., Willan, R.C.R., Wareham, C.D. and Boyce, A.J. <http://eprints.gla.ac.uk/view/author/1919.html> (2001) The role of crustal and mantle sources in the genesis of granitoids of the Antarctic Peninsula and adjacent crustal blocks. Journal of the Geological Society <https://eprints.gla.ac.uk/view/journal_volume/Journal_of_the_Geological_Society.html>, 158(5), pp. 855-867. |
_version_ |
1800750843047182336 |