Continental growth histories revealed by detrital zircon trace elements; a case study from India

Simultaneous acquisition of detrital zircon Pb-Pb ages and trace element abundances from grains collected across the Indian craton, spanning ∼3 b.y., reveals prominent shifts in Eu/Eu* and light and middle to heavy rare earth element ratios. These shifts correspond to a ca. 3.0-2.2 Ga interval of cr...

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Bibliographic Details
Published in:Geology (Boulder) 2018-03, Vol.46 (3), p.275-278
Main Authors: McKenzie, N. Ryan, Smye, Andrew J, Hegde, Venkatraman S, Stockli, Daniel F
Format: Article
Language:English
Subjects:
absolute age
Accretion
Asia
Case studies
chemical fractionation
chemical ratios
continental crust
Continental margins
Cratons
crust
Crustal thickness
Deposition
Earth
fractional crystallization
Gallium
geochemistry
Geochronology
Geology
igneous and metamorphic rocks
India
Indian Peninsula
Lead
Magma
magmas
metals
nesosilicates
orthosilicates
Pb/Pb
Petrology
Phanerozoic
Radiometric dating
Rare earth elements
rare earths
Ratios
silicates
Thickening
thickness
Trace elements
Zircon
zircon group
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Summary:Simultaneous acquisition of detrital zircon Pb-Pb ages and trace element abundances from grains collected across the Indian craton, spanning ∼3 b.y., reveals prominent shifts in Eu/Eu* and light and middle to heavy rare earth element ratios. These shifts correspond to a ca. 3.0-2.2 Ga interval of crustal thickening during Indian craton formation, followed by a period wherein arc magmatism occurred along thinner craton margins from ca. 1.9 to 1.0 Ga, with arc magmatism concentrated along attenuated continental margins after ca. 1.0 Ga. Similar temporal shifts in trace element concentrations are recognized in global whole-rock compilations. We propose that the post-1.0 Ga increase in juvenile magmatism reflects a switch to lateral arc terrane accretion as the primary style of continental growth over the past billion years.
ISSN:0091-7613
1943-2682
DOI:10.1130/G39973.1