New age constraints for orogenic collapse and voluminous late-tectonic
Summary The southern third of the more than 8000 km long, Late Neoproterozoic/Early Paleozoic East African-Antarctic Orogen in Dronning Maud Land and northern Mozambique is characterised by lateral extrusion, late tectonic extensional shearing and large volumes of late tectonic igneous rocks. We pro...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.582.8485 2023-05-15T13:47:30+02:00 New age constraints for orogenic collapse and voluminous late-tectonic British Geological Survey Kingsley Dunham Centre Nottingham Ng Gg The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.582.8485 http://nora.nerc.ac.uk/5600/1/Jacobs_et_al_2007.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.582.8485 http://nora.nerc.ac.uk/5600/1/Jacobs_et_al_2007.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://nora.nerc.ac.uk/5600/1/Jacobs_et_al_2007.pdf text ftciteseerx 2016-08-28T00:03:41Z Summary The southern third of the more than 8000 km long, Late Neoproterozoic/Early Paleozoic East African-Antarctic Orogen in Dronning Maud Land and northern Mozambique is characterised by lateral extrusion, late tectonic extensional shearing and large volumes of late tectonic igneous rocks. We provide new SHRIMP data for extensional shearing and the timing of late-tectonic igneous activity. The new geochronological ages for the late tectonic granitoid intrusions range between 508-500 Ma, whilst metamorphism along a significant extensional shear zone was dated at c. 510 Ma. The granitoids are part of a> 15,000 km2 large igneous province that can be traced to the Lurio Belt in northern Mozambique. The granitoids have A2-type geochemistry and are thought to represent lower crustal partial melting, that probably resulted from asthenosphere influx after part of the orogen root had delaminated. The northern margin of this large igneous province appears as a tectonic boundary, the Lurio Belt. Text Antarc* Antarctic Dronning Maud Land Unknown Antarctic Dronning Maud Land |
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English |
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Summary The southern third of the more than 8000 km long, Late Neoproterozoic/Early Paleozoic East African-Antarctic Orogen in Dronning Maud Land and northern Mozambique is characterised by lateral extrusion, late tectonic extensional shearing and large volumes of late tectonic igneous rocks. We provide new SHRIMP data for extensional shearing and the timing of late-tectonic igneous activity. The new geochronological ages for the late tectonic granitoid intrusions range between 508-500 Ma, whilst metamorphism along a significant extensional shear zone was dated at c. 510 Ma. The granitoids are part of a> 15,000 km2 large igneous province that can be traced to the Lurio Belt in northern Mozambique. The granitoids have A2-type geochemistry and are thought to represent lower crustal partial melting, that probably resulted from asthenosphere influx after part of the orogen root had delaminated. The northern margin of this large igneous province appears as a tectonic boundary, the Lurio Belt. |
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The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
British Geological Survey Kingsley Dunham Centre Nottingham Ng Gg |
spellingShingle |
British Geological Survey Kingsley Dunham Centre Nottingham Ng Gg New age constraints for orogenic collapse and voluminous late-tectonic |
author_facet |
British Geological Survey Kingsley Dunham Centre Nottingham Ng Gg |
author_sort |
British Geological Survey |
title |
New age constraints for orogenic collapse and voluminous late-tectonic |
title_short |
New age constraints for orogenic collapse and voluminous late-tectonic |
title_full |
New age constraints for orogenic collapse and voluminous late-tectonic |
title_fullStr |
New age constraints for orogenic collapse and voluminous late-tectonic |
title_full_unstemmed |
New age constraints for orogenic collapse and voluminous late-tectonic |
title_sort |
new age constraints for orogenic collapse and voluminous late-tectonic |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.582.8485 http://nora.nerc.ac.uk/5600/1/Jacobs_et_al_2007.pdf |
geographic |
Antarctic Dronning Maud Land |
geographic_facet |
Antarctic Dronning Maud Land |
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Antarc* Antarctic Dronning Maud Land |
genre_facet |
Antarc* Antarctic Dronning Maud Land |
op_source |
http://nora.nerc.ac.uk/5600/1/Jacobs_et_al_2007.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.582.8485 http://nora.nerc.ac.uk/5600/1/Jacobs_et_al_2007.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766247233879015424 |