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Article: Apatite (U-Th)/He thermochronometric constraints on the northern extent of the Deccan large igneous province

TitleApatite (U-Th)/He thermochronometric constraints on the northern extent of the Deccan large igneous province
Authors
KeywordsDeccan
large igneous province
apatite
thermochronometry
Bundelkhand craton
Issue Date2021
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/epsl
Citation
Earth and Planetary Science Letters, 2021, v. 571, p. article no. 117087 How to Cite?
AbstractThe volcanic emplacement and subsequent weathering of the Deccan Traps of India is believed to have had a significant influence in driving global climatic shifts from the Late Cretaceous and through the Cenozoic. The magnitude of the Deccan Traps' impact on Earth's surface environment is largely dependent on the speculated original footprint of the large igneous province. To test established estimates for the pre-erosive northern extent of the Deccan Traps, we applied low-temperature apatite (U-Th)/He thermochronology (AHe) on rocks from the Bundelkhand craton and overlying Proterozoic Vindhyan successions of central India ∼150–200 km northeast of the northernmost preservation of Deccan basalts. New AHe data reveal young ∼5–85 Ma AHe dates with low effective uranium concentrations (eU) between 5–22 ppm, with a steep positive date-eU correlation that plateaus at ∼350 Ma in grains with eU values >50 ppm. Inverse thermal history modeling—utilizing AHe diffusion parameters of the Radiation Damage Accumulation and Annealing Model (RDAAM)—indicate that observed AHe date-eU correlations are most consistent with thermal histories that require the craton and Vindhyan strata to be at or near surface temperatures by ∼66 Ma, followed by a discrete reheating event associated with Deccan volcanism. These results establish new minimal areal constraints for the northern extent of Deccan volcanism which thermally perturbed much of the Vindhyan succession. Thermal alteration of organic rich Vindhyan sediment may have provided an additional source of volatile emissions that facilitated late Maastrichtian warming at the onset of Deccan volcanism. New minimal northern constraints on Deccan volcanism additionally confirm that large volumes of Deccan basalts have been stripped away since the time of their emplacement, which poses considerable implications for unraveling their role in Cenozoic cooling.
Persistent Identifierhttp://hdl.handle.net/10722/302059
ISSN
2020 Impact Factor: 5.255
2020 SCImago Journal Rankings: 2.829

 

DC FieldValueLanguage
dc.contributor.authorCOLLEPS, CL-
dc.contributor.authorMc Kenzie, NR-
dc.contributor.authorGuenthner, WR-
dc.contributor.authorSharma, M-
dc.contributor.authorGibson, TM-
dc.contributor.authorStockli, DF-
dc.date.accessioned2021-08-21T03:30:58Z-
dc.date.available2021-08-21T03:30:58Z-
dc.date.issued2021-
dc.identifier.citationEarth and Planetary Science Letters, 2021, v. 571, p. article no. 117087-
dc.identifier.issn0012-821X-
dc.identifier.urihttp://hdl.handle.net/10722/302059-
dc.description.abstractThe volcanic emplacement and subsequent weathering of the Deccan Traps of India is believed to have had a significant influence in driving global climatic shifts from the Late Cretaceous and through the Cenozoic. The magnitude of the Deccan Traps' impact on Earth's surface environment is largely dependent on the speculated original footprint of the large igneous province. To test established estimates for the pre-erosive northern extent of the Deccan Traps, we applied low-temperature apatite (U-Th)/He thermochronology (AHe) on rocks from the Bundelkhand craton and overlying Proterozoic Vindhyan successions of central India ∼150–200 km northeast of the northernmost preservation of Deccan basalts. New AHe data reveal young ∼5–85 Ma AHe dates with low effective uranium concentrations (eU) between 5–22 ppm, with a steep positive date-eU correlation that plateaus at ∼350 Ma in grains with eU values >50 ppm. Inverse thermal history modeling—utilizing AHe diffusion parameters of the Radiation Damage Accumulation and Annealing Model (RDAAM)—indicate that observed AHe date-eU correlations are most consistent with thermal histories that require the craton and Vindhyan strata to be at or near surface temperatures by ∼66 Ma, followed by a discrete reheating event associated with Deccan volcanism. These results establish new minimal areal constraints for the northern extent of Deccan volcanism which thermally perturbed much of the Vindhyan succession. Thermal alteration of organic rich Vindhyan sediment may have provided an additional source of volatile emissions that facilitated late Maastrichtian warming at the onset of Deccan volcanism. New minimal northern constraints on Deccan volcanism additionally confirm that large volumes of Deccan basalts have been stripped away since the time of their emplacement, which poses considerable implications for unraveling their role in Cenozoic cooling.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/epsl-
dc.relation.ispartofEarth and Planetary Science Letters-
dc.subjectDeccan-
dc.subjectlarge igneous province-
dc.subjectapatite-
dc.subjectthermochronometry-
dc.subjectBundelkhand craton-
dc.titleApatite (U-Th)/He thermochronometric constraints on the northern extent of the Deccan large igneous province-
dc.typeArticle-
dc.identifier.emailMc Kenzie, NR: ryan00@hku.hk-
dc.identifier.authorityMc Kenzie, NR=rp02198-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.epsl.2021.117087-
dc.identifier.scopuseid_2-s2.0-85110442363-
dc.identifier.hkuros324174-
dc.identifier.volume571-
dc.identifier.spagearticle no. 117087-
dc.identifier.epagearticle no. 117087-
dc.publisher.placeNetherlands-

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