Enriched Subcontinental Upper Mantle beneath Southern India: Evidence from Pb, Nd, Sr, and C-O Isotopic Studies on Tamil Nadu Carbonatites

Autor:	Shrivinas G. Viladkar, Manfred Schidlowski, Ernst Pernicka, Fatemeh Schmidt, Ulrich Kramm, Helmut Schleicher, V. Subramanian, Wolfgang Todt
Rok vydání:	1998
Předmět:	Isochron Isotope Stable isotope ratio Rare-earth element Geochemistry Mineralogy Mantle (geology) language.human_language Geophysics Geochemistry and Petrology Isotope geochemistry Tamil Carbonatite language Geology
Zdroj:	Journal of Petrology. 39:1765-1785
ISSN:	1460-2415 0022-3530
DOI:	10.1093/petroj/39.10.1765
Popis:	The major, trace and rare earth element distributions as well as the contrast to the lead data, the Nd–Sr isotope data show a clear Nd, Sr, Pb, C and O isotope geochemistry of four carbonatite signature of a mantle source excluding crustal contamination. The occurrences (Sevattur, Jogipatti, Samalpatti, Pakkanadu) from Tamil data are compatible with either an EM I-like mantle component Nadu, southern India, have been investigated. The majority of these 800 my ago or a mixing process between two mantle reservoirs. carbonatites are highly enriched in light rare earth elements (LREE) and exhibit stable isotope patterns similar to those reported for primary mantle-derived carbonatitic melts. In Sevattur, a welldefined lead/lead isochron yields an age of 801 ± 11 Ma for ankeritic carbonatites. Most of the samples from the other Tamil
Databáze:	OpenAIRE
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