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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Subduction-accretion-collision history along the Gondwana suture in southern India: A laser ablation ICP-MS study of zircon chronology
Journal of Asian Earth Sciences, Volume 40, No. 1, Year 2011
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Description
We report the petrological characteristics and preliminary zircon geochronology based on laser ablation ICP mass spectrometry of the various units in an accretionary belt within the Palghat-Cauvery Shear/Suture Zone in southern India, a trace of the Cambrian Gondwana suture. Zircons extracted from a plagiogranite in association with an ophiolite suite within this suture possess internal structure that suggests magmatic crystallization, and yield mid Neoproterozoic 206Pb/238U age of 817±16Ma (error: 1σ) constraining the approximate timing of birth of the Mozambique Ocean floor. Compiled age data on zircons separated from a quartzite and metamorphosed banded iron formation within the accretionary belt yields a younger intercept age of 759±41Ma (error: 1σ) which we relate to a mid Neoproteozoic magmatic arc. Detrital zircons extracted from the quartzite yield 207Pb/206Pb age peaks of about 1.9-2.6Ga suggesting that they were sourced from multiple protolithis of Neoarchean and Paleoproterozoic. Metamorphic overgrowths on some zircon grains record ca. 500-550Ma ages which are in good harmony with the known ages for the timing of high-grade metamorphism in this zone during the final stage of continent collision associated with the birth of the Gondwana supercontinent in the latest Neoproterozoic-Cambrian. The preliminary geochronological results documented in our study correlate with the subduction-accretion-collision history associated with the closure of the Mozambique Ocean and the final amalgamation of the Gondwana supercontinent. © 2010 Elsevier Ltd.
Authors & Co-Authors
Sato, Kei
Japan, Tokyo
Japan Society for the Promotion of Science
Australia, Canberra
The Australian National University
Santosh, M. Warrier
United States, St. Louis
Saint Louis University
Japan, Kochi
Kochi University
Tsunogae, Toshiaki
Japan, Tsukuba
University of Tsukuba
Chetty, Talari R.K.
India, Hyderabad
National Geophysical Research Institute India
Hirata, Takafumi
Japan, Kyoto
Kyoto University
Statistics
Citations: 89
Authors: 5
Affiliations: 7
Identifiers
Doi:
10.1016/j.jseaes.2010.08.008
ISSN:
13679120
Study Locations
Mozambique