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Type: Journal article
Title: Gemstone mineralization in the palghat-cauvery shear zone system (Karur-Kangayam Belt), Southern India
Author: Santosh, M.
Collins, A.
Citation: Gondwana Research, 2003; 6(4):911-918
Publisher: Int Assoc Gondwana Research
Issue Date: 2003
ISSN: 1342-937X
Statement of
M. Santosh and Alan S. Collins
Abstract: We summarize here the occurrence of a number of semiprecious stones within a major gemstone belt in the Palghat-Cauvery shear zone system close to the northern margin of the Madurai Granulite Block, southern India. The gem mineralization in this belt includes different varieties of corundum (star ruby, sapphire), cordierite (iolite), feldspar (moonstones and sunstone of various hues), beryl (emerald, aquamarine), chrysoberyl (alexandrite), kornerupine, topaz, spinel, crystal quartz and amethyst, among others. Gem mineralisation has not been directly dated, but is associated with pegmatites that crosscut rocks metamorphosed in late Neoproterozoic/Early Cambrian times. Similar aged gem mineralization occurs south of the Achankovil Shear Zone in southern India, as well as in Sri Lanka and Madagascar and strengthen the view of a broad late Neoproterozoic-early Cambrian gemstone province in central Gondwana. The ruby mineralization within this belt can be correlated with similar occurrences in eastern Madagascar, supporting a correlation between the Malagasy Betsimisaraka suture zone and the Palghat-Cauvery shear zone system in southern India.
Keywords: gemstone mineralization
Palghat-Cauvery shear zone system
Gondwana assembly
Description: Copyright © 2003 International Association for Gondwana Research, Japan.
DOI: 10.1016/S1342-937X(05)71035-2
Grant ID: 13377005
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