The Neoarchaean Sittampundi Anorthosite Complex located in central Tamil Nadu represents layered sequence of chromitite and meta-anorthosite with discontinuous lenses of eclogite/garnet-pyroxene granulite. The chromitite hosting the PGE mineralisation occurs as discontinuous bands and lenses within the meta-anorthosite with width of the individual band/layer varies from a few centimeter to 5 m. It is made up of 30 to 70 % chromite/chrome-spinel, clino-amphibole (magnesio-hornblende/tschermakite) with minor clino-pyroxene (augite). Rutile occurs as main accessory along with magnetite and ilmenite. Chromite/chrome-spinel occurs in two generations – one as larger grains with inclusions of rutile and amphibole and the other as tiny interstitial grains amidst amphibole. The PGE mineralisation is mostly confined to the chromitite bands in the eastern part of the complex, while it is found both in chromitite and in the adjoining sulphide-bearing anorthosite in the western part. The PGE concentration in the chromitite ranges from 0.5 to 2.0 ppm (Pt + Pd) with occasional high values up to 25 ppm. The chromitite and the associated anorthosite show moderate to rich disseminations of sulphides viz. chalcopyrite, pyrite, pyrrhotite, pentlandite, polydymite and millerite in the western part around Tasampalaiyam. An array of PGM phases both as native metal as well as alloys in the form of sulphides, arsenides, tellurides and antimonides have been identified within the 3.6 km long PGE mineralised zone delineated in this complex.
Chromite and Sulphide Hosted PGE Mineralisation in Sittampundi Layered Anorthosite Complex, Tamil Nadu
₹300.00
The Neoarchaean Sittampundi Anorthosite Complex located in central Tamil Nadu represents layered sequence of chromitite and meta-anorthosite with discontinuous lenses of eclogite/garnet-pyroxene granulite. The chromitite hosting the PGE mineralisation occurs as discontinuous bands and lenses within the meta-anorthosite with width of the individual band/layer varies from a few centimeter to 5 m. It is made up of 30 to 70 % chromite/chrome-spinel, clino-amphibole (magnesio-hornblende/tschermakite) with minor clino-pyroxene (augite). Rutile occurs as main accessory along with magnetite and ilmenite. Chromite/chrome-spinel occurs in two generations – one as larger grains with inclusions of rutile and amphibole and the other as tiny interstitial grains amidst amphibole. The PGE mineralisation is mostly confined to the chromitite bands in the eastern part of the complex, while it is found both in chromitite and in the adjoining sulphide-bearing anorthosite in the western part. The PGE concentration in the chromitite ranges from 0.5 to 2.0 ppm (Pt + Pd) with occasional high values up to 25 ppm. The chromitite and the associated anorthosite show moderate to rich disseminations of sulphides viz. chalcopyrite, pyrite, pyrrhotite, pentlandite, polydymite and millerite in the western part around Tasampalaiyam. An array of PGM phases both as native metal as well as alloys in the form of sulphides, arsenides, tellurides and antimonides have been identified within the 3.6 km long PGE mineralised zone delineated in this complex.
Publication Mode |
Online |
---|---|
Publication Author |
S. Dhanendran, N. P. Nathan, R. Vijay Kumar, Laya M. B. Pillai, A. Balukkarasu |
Publication Language |
English |
Publication Type |
Conference Paper |
Publication Year |
2014 |
DOI |
10.17491/cgsi/2014/63385 |
You must be logged in to post a review.
Reviews
There are no reviews yet.