Geochemical characterization of a reconstructed 1110 Ma Large Igneous Province
1110 Ma Large Igneous Province (LIP) fragments in the Kalahari craton, southern Africa (Umkondo LIP); Dronning Maud Land, Antarctica; Bundelkhand portion of Indian craton (Mahoba dolerite dykes); Congo craton (Huila-Epembe dolerite dykes); and Amazonia (Rincon del Tigre-Huanchaca LIP) have been reco...
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Language: | English |
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Online Access: | http://ir.gig.ac.cn/handle/344008/48875 https://doi.org/10.1016/j.precamres.2019.105382 |
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ftchacadscgigcas:oai:ir.gig.ac.cn:344008/48875 2023-05-15T13:35:51+02:00 Geochemical characterization of a reconstructed 1110 Ma Large Igneous Province Choudhary, Babita R. Ernst, Richard E. Xu, Yi-Gang Evans, David A. D. de Kock, Michiel O. Meert, Joseph G. Ruiz, Amarildo S. Lima, Gabrielle A. 2019-09-15 http://ir.gig.ac.cn/handle/344008/48875 https://doi.org/10.1016/j.precamres.2019.105382 英语 eng ELSEVIER PRECAMBRIAN RESEARCH http://ir.gig.ac.cn/handle/344008/48875 doi:10.1016/j.precamres.2019.105382 Geology Mesoproterozoic Large Igneous Province Geochemistry-reconstruction 1110 Ma dykes swarms Umkondia Geosciences Multidisciplinary DYKE SWARMS KALAHARI CRATON MAGMATIC EVENTS CENTRAL INDIA PLATE MOTION 2.5 GA MANTLE EVOLUTION ETENDEKA VOLCANISM 期刊论文 2019 ftchacadscgigcas https://doi.org/10.1016/j.precamres.2019.105382 2020-12-22T07:22:26Z 1110 Ma Large Igneous Province (LIP) fragments in the Kalahari craton, southern Africa (Umkondo LIP); Dronning Maud Land, Antarctica; Bundelkhand portion of Indian craton (Mahoba dolerite dykes); Congo craton (Huila-Epembe dolerite dykes); and Amazonia (Rincon del Tigre-Huanchaca LIP) have been reconstructed as a single LIP with plume centre beneath the NW part of the Kalahari Craton. This paper offers the best estimates for the paleoposition of the Indian and Amazonian cratons along with conjoined Kalahari-SF/Congo reconstruction. This 1110 Ma mafic magmatism is dominantly tholeiitic, ranging from basalt to andesitic basalt in composition, generated over a range of mantle melting depths [(Gd/Yb)N = 1.2-2.3], exhibit low to high contamination with crustal components (negative Nb anomalies, eNd (0 to -12), and elevated Th/Yb). The data fall into two Groups based on TiO2 content, with Group 1 (low Ti) of andesitic basalt composition, and Group 2 (high Ti) exhibiting a basaltic affinity. Group 1 magmas were generated in the spinel lherzolite field followed by significant contamination likely during passage through metasomatised lithospheric mantle in crustal magma chambers. A greater melting depth reaching into the garnet lherzolite field is proposed for the Group 2 magmas. The majority of Group 2 units are located in the Kalahari and Congo cratons, and this reflects onset of deeper melting closer to the interpreted plume axis in our reconstruction. Report Antarc* Antarctica Dronning Maud Land Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences) Dronning Maud Land Indian Tigre ENVELOPE(-67.700,-67.700,-67.183,-67.183) Precambrian Research 332 105382 |
institution |
Open Polar |
collection |
Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchacadscgigcas |
language |
English |
topic |
Geology Mesoproterozoic Large Igneous Province Geochemistry-reconstruction 1110 Ma dykes swarms Umkondia Geosciences Multidisciplinary DYKE SWARMS KALAHARI CRATON MAGMATIC EVENTS CENTRAL INDIA PLATE MOTION 2.5 GA MANTLE EVOLUTION ETENDEKA VOLCANISM |
spellingShingle |
Geology Mesoproterozoic Large Igneous Province Geochemistry-reconstruction 1110 Ma dykes swarms Umkondia Geosciences Multidisciplinary DYKE SWARMS KALAHARI CRATON MAGMATIC EVENTS CENTRAL INDIA PLATE MOTION 2.5 GA MANTLE EVOLUTION ETENDEKA VOLCANISM Choudhary, Babita R. Ernst, Richard E. Xu, Yi-Gang Evans, David A. D. de Kock, Michiel O. Meert, Joseph G. Ruiz, Amarildo S. Lima, Gabrielle A. Geochemical characterization of a reconstructed 1110 Ma Large Igneous Province |
topic_facet |
Geology Mesoproterozoic Large Igneous Province Geochemistry-reconstruction 1110 Ma dykes swarms Umkondia Geosciences Multidisciplinary DYKE SWARMS KALAHARI CRATON MAGMATIC EVENTS CENTRAL INDIA PLATE MOTION 2.5 GA MANTLE EVOLUTION ETENDEKA VOLCANISM |
description |
1110 Ma Large Igneous Province (LIP) fragments in the Kalahari craton, southern Africa (Umkondo LIP); Dronning Maud Land, Antarctica; Bundelkhand portion of Indian craton (Mahoba dolerite dykes); Congo craton (Huila-Epembe dolerite dykes); and Amazonia (Rincon del Tigre-Huanchaca LIP) have been reconstructed as a single LIP with plume centre beneath the NW part of the Kalahari Craton. This paper offers the best estimates for the paleoposition of the Indian and Amazonian cratons along with conjoined Kalahari-SF/Congo reconstruction. This 1110 Ma mafic magmatism is dominantly tholeiitic, ranging from basalt to andesitic basalt in composition, generated over a range of mantle melting depths [(Gd/Yb)N = 1.2-2.3], exhibit low to high contamination with crustal components (negative Nb anomalies, eNd (0 to -12), and elevated Th/Yb). The data fall into two Groups based on TiO2 content, with Group 1 (low Ti) of andesitic basalt composition, and Group 2 (high Ti) exhibiting a basaltic affinity. Group 1 magmas were generated in the spinel lherzolite field followed by significant contamination likely during passage through metasomatised lithospheric mantle in crustal magma chambers. A greater melting depth reaching into the garnet lherzolite field is proposed for the Group 2 magmas. The majority of Group 2 units are located in the Kalahari and Congo cratons, and this reflects onset of deeper melting closer to the interpreted plume axis in our reconstruction. |
format |
Report |
author |
Choudhary, Babita R. Ernst, Richard E. Xu, Yi-Gang Evans, David A. D. de Kock, Michiel O. Meert, Joseph G. Ruiz, Amarildo S. Lima, Gabrielle A. |
author_facet |
Choudhary, Babita R. Ernst, Richard E. Xu, Yi-Gang Evans, David A. D. de Kock, Michiel O. Meert, Joseph G. Ruiz, Amarildo S. Lima, Gabrielle A. |
author_sort |
Choudhary, Babita R. |
title |
Geochemical characterization of a reconstructed 1110 Ma Large Igneous Province |
title_short |
Geochemical characterization of a reconstructed 1110 Ma Large Igneous Province |
title_full |
Geochemical characterization of a reconstructed 1110 Ma Large Igneous Province |
title_fullStr |
Geochemical characterization of a reconstructed 1110 Ma Large Igneous Province |
title_full_unstemmed |
Geochemical characterization of a reconstructed 1110 Ma Large Igneous Province |
title_sort |
geochemical characterization of a reconstructed 1110 ma large igneous province |
publisher |
ELSEVIER |
publishDate |
2019 |
url |
http://ir.gig.ac.cn/handle/344008/48875 https://doi.org/10.1016/j.precamres.2019.105382 |
long_lat |
ENVELOPE(-67.700,-67.700,-67.183,-67.183) |
geographic |
Dronning Maud Land Indian Tigre |
geographic_facet |
Dronning Maud Land Indian Tigre |
genre |
Antarc* Antarctica Dronning Maud Land |
genre_facet |
Antarc* Antarctica Dronning Maud Land |
op_relation |
PRECAMBRIAN RESEARCH http://ir.gig.ac.cn/handle/344008/48875 doi:10.1016/j.precamres.2019.105382 |
op_doi |
https://doi.org/10.1016/j.precamres.2019.105382 |
container_title |
Precambrian Research |
container_volume |
332 |
container_start_page |
105382 |
_version_ |
1766071191306502144 |