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Article: Age and implications of the phosphatic Birmania Formation, Rajasthan, India

TitleAge and implications of the phosphatic Birmania Formation, Rajasthan, India
Authors
KeywordsNeoproterozoic
Red algae
Phosphorite
Microfossil
India
Detrital zircon
Issue Date2015
Citation
Precambrian Research, 2015, v. 267, p. 164-173 How to Cite?
Abstract© 2015 Elsevier B.V.The Birmania inlier in western Rajasthan, India, contains important phosphate deposits, the depositional age of which is poorly constrained. Here we provide the first direct age constraints for the phosphate-bearing Birmania Formation using a combination of paleontological and detrital zircon U-Pb data. The occurrence of the multicellular algal fossil Wengania exquisita in phosphatic chert of the Birmania Formation suggest that it was deposited during the Ediacaran. Detrital zircon age distributions contain prominent populations of 1.7-1.9 Ga grains, with subordinate younger grains that range from 650 to 980 Ma. The distribution broadly resembles those from Neoproterozoic strata from both cratonic and Himalayan India but, like zircon age distributions from the Marwar Group, lacks 1.0-1.2 Ga grains, which may suggest that both areas shared similar local sources. The lack of zircon grains younger than ~650. Ma is consistent with an Ediacaran depositional age because almost all Cambrian or younger strata from India have yielded Cambrian or latest Neoproterozoic age grains. These findings raise the possibility of a previously unrecognized late Neoproterozoic episode of phosphogenesis on the India craton. The presence of Wengania exquisita further supports strong palaeogeographic affinity between the India and South China during the Neoproterozoic and Cambrian.
Persistent Identifierhttp://hdl.handle.net/10722/230995
ISSN
2015 Impact Factor: 4.037
2015 SCImago Journal Rankings: 3.214

 

DC FieldValueLanguage
dc.contributor.authorHughes, Nigel C.-
dc.contributor.authorMyrow, Paul M.-
dc.contributor.authorMcKenzie, N. Ryan-
dc.contributor.authorXiao, Shuhai-
dc.contributor.authorBanerjee, Dhiraj M.-
dc.contributor.authorStockli, Daniel F.-
dc.contributor.authorTang, Qing-
dc.date.accessioned2016-09-01T06:07:20Z-
dc.date.available2016-09-01T06:07:20Z-
dc.date.issued2015-
dc.identifier.citationPrecambrian Research, 2015, v. 267, p. 164-173-
dc.identifier.issn0301-9268-
dc.identifier.urihttp://hdl.handle.net/10722/230995-
dc.description.abstract© 2015 Elsevier B.V.The Birmania inlier in western Rajasthan, India, contains important phosphate deposits, the depositional age of which is poorly constrained. Here we provide the first direct age constraints for the phosphate-bearing Birmania Formation using a combination of paleontological and detrital zircon U-Pb data. The occurrence of the multicellular algal fossil Wengania exquisita in phosphatic chert of the Birmania Formation suggest that it was deposited during the Ediacaran. Detrital zircon age distributions contain prominent populations of 1.7-1.9 Ga grains, with subordinate younger grains that range from 650 to 980 Ma. The distribution broadly resembles those from Neoproterozoic strata from both cratonic and Himalayan India but, like zircon age distributions from the Marwar Group, lacks 1.0-1.2 Ga grains, which may suggest that both areas shared similar local sources. The lack of zircon grains younger than ~650. Ma is consistent with an Ediacaran depositional age because almost all Cambrian or younger strata from India have yielded Cambrian or latest Neoproterozoic age grains. These findings raise the possibility of a previously unrecognized late Neoproterozoic episode of phosphogenesis on the India craton. The presence of Wengania exquisita further supports strong palaeogeographic affinity between the India and South China during the Neoproterozoic and Cambrian.-
dc.languageeng-
dc.relation.ispartofPrecambrian Research-
dc.subjectNeoproterozoic-
dc.subjectRed algae-
dc.subjectPhosphorite-
dc.subjectMicrofossil-
dc.subjectIndia-
dc.subjectDetrital zircon-
dc.titleAge and implications of the phosphatic Birmania Formation, Rajasthan, India-
dc.typeArticle-
dc.description.natureLink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.precamres.2015.06.012-
dc.identifier.scopuseid_2-s2.0-84937019994-
dc.identifier.volume267-
dc.identifier.spage164-
dc.identifier.epage173-

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