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|Title:||ARE THE VINJAMUR ROCKS CARBONATITES OR META-LIMESTONES|
|Publisher:||GEOLOGICAL SOC INDIA|
|Citation:||JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA, 46(2), 125-137|
|Abstract:||New whole-rock rare earth element (REE) data for the metacarbonate rocks interbedded with schists at Vinjamur in the Nellore Schist Belt of Andhra Pradesh, show low total REE contents (Sigma 9-128 ppm) that are inconsistent with an igneous carbonatitic origin but which correspond more closely with a sedimentary limestone origin. The REE data of these rocks however, do not give absolute discrimination between marbles of meta-limestone and metacarbonatite origin. Micro-probe analytical data give better discrimination, and the chemical compositions of the calcite, micas, amphibole, plagioclase, apatite, monazite and staurolite in the Vinjamur marbles give strong and consistent evidence of a metamorphosed sedimentary rather than an igneous origin.|
|Appears in Collections:||Article|
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