Need to intensify base metal exploration activities in Mikir Hills, northeastern India

Precambrian shield areas are often metal-enriched. Unlike many other contemporary shields, the Mikir Hills, however, does not have any history of metal production in the past. Ultrabasic–basic–intermediate to acid and alkaline magmatics of Precambrian to Cretaceous age depict evidences of mineraliza...

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Bibliographic Details
Published in:Current science (Bangalore) 2010-09, Vol.99 (5), p.656-662
Main Author: Majumdar, D.
Format: Article
Language:English
Subjects:
Age
Base metals
Charge coupled devices
Copper
Cratons
Geochemistry
Geochronology
Geology
Granite
Mineralization
Minerals
Precambrian supereon
Pyrites
RESEARCH COMMUNICATIONS
Rocks
Shields
Signatures
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Summary:Precambrian shield areas are often metal-enriched. Unlike many other contemporary shields, the Mikir Hills, however, does not have any history of metal production in the past. Ultrabasic–basic–intermediate to acid and alkaline magmatics of Precambrian to Cretaceous age depict evidences of mineralization in the shield. Poor understanding of the geological and geo-chronological events is responsible for branding barren signature to the shield. Recently generated geo-chronological data on mineralized Palaeoproterozoic granitoids of the shield provide cognizance to its geological evolution. The merit of metallogenic appraisal brightens as the geochronological data produced recently indicate the existence of granitoids of Palaeoproterozoic age in this craton. Moreover, recent studies have revealed that a majority of felsic to intermediate magmatics with distinct mineralization signatures are mantle-derived I-type granitoids and their metal contents are derived from similar source region. Features of hypogene alteration found prominence in a studied mineralized porphyry granitoid of Kuthori–Bagori locality of Kaziranga magmatic suite having calc-alkaline affinity. Local and regional-scale shearing has been observed and the structural elements are oriented in NNE–SSW to NE–SW directions. They are sporadically mineralized throughout the craton.
ISSN:0011-3891