PGE distribution in the Chromite bearing mafic-ultramafic Kondapalli Layered Complex, Krishna district, Andhra Pradesh, India

The Kondapalli Layered Complex (KLC) is a dismembered mafic-ultramafic layered intrusion, mainly composed of gabbroic and anorthositic rocks with subordinate ultramafics and chromitite. Chromitite occurs as lenses, pods, bands and disseminations. Platinum group of minerals (PGMs) occur as inclusions...

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Main Authors: Meshram Tushar M., Nannaware Shraddha. B., Nannaware B., Bhatacharjee Shantanu, Waghmare Minakshi. M., Rajakumar T.
Format: Article
Language:English
Published: De Gruyter 2015-09-01
Series:Open Geosciences
Subjects:
Online Access:https://doi.org/10.1515/geo-2015-0018
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author Meshram Tushar M.
Nannaware Shraddha. B.
Nannaware B.
Bhatacharjee Shantanu
Waghmare Minakshi. M.
Rajakumar T.
author_facet Meshram Tushar M.
Nannaware Shraddha. B.
Nannaware B.
Bhatacharjee Shantanu
Waghmare Minakshi. M.
Rajakumar T.
author_sort Meshram Tushar M.
collection DOAJ
description The Kondapalli Layered Complex (KLC) is a dismembered mafic-ultramafic layered intrusion, mainly composed of gabbroic and anorthositic rocks with subordinate ultramafics and chromitite. Chromitite occurs as lenses, pods, bands and disseminations. Platinum group of minerals (PGMs) occur as inclusions within chromite and silicates. The study indicates an inhomogeneous distribution of PGMs and distinct dominance of IPGEs over the PPGEs. The average ΣPGE content of chromite of KLC varies from 64 ppb to 576 ppb with Pt ranging from 5 to 495 ppb, Pd 5 to 191 ppb, Ir 3 to 106 ppb, Ru 3 to 376 ppb and Rh 3 to 135 ppb. The PGMs identified in the KLC indicate primary deposition of the IPGE, preceding chromite, indicating its orthomagmatic nature. Most of the PGM grains are usually below 10 μm. The identified PGMs are Laurite (RuS2), irarsite (Ir, As, S), iridosmine (Os, Ir), undetermined Os-Ir sulphide and Ru-Os-Ir-Zn alloys. Chromite also contains inclusions of pentlandite, millerite, chalcopyrite and pyrite. Study indicating that the KLC have orthomagmatic origin for PGE which are dominated by IPGE group and formed under surpa-subduction zone peridotite setting.
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spelling doaj.art-4a70a264efb14306996b3dfa1ccbdd372022-12-21T22:00:48ZengDe GruyterOpen Geosciences2391-54472015-09-017110.1515/geo-2015-0018geo-2015-0018PGE distribution in the Chromite bearing mafic-ultramafic Kondapalli Layered Complex, Krishna district, Andhra Pradesh, IndiaMeshram Tushar M.0Nannaware Shraddha. B.1Nannaware B.2Bhatacharjee Shantanu3Waghmare Minakshi. M.4Rajakumar T.5Geological Survey of India, southern region, Hyderabad-68, Andhra Pradesh, IndiaGeological Survey of India, southern region, Hyderabad-68, Andhra Pradesh, IndiaGeological Survey of India, southern region, Hyderabad-68, Andhra Pradesh, IndiaGeological Survey of India, southern region, Hyderabad-68, Andhra Pradesh, IndiaGeological Survey of India, southern region, Hyderabad-68, Andhra Pradesh, IndiaGeological Survey of India, southern region, Hyderabad-68, Andhra Pradesh, IndiaThe Kondapalli Layered Complex (KLC) is a dismembered mafic-ultramafic layered intrusion, mainly composed of gabbroic and anorthositic rocks with subordinate ultramafics and chromitite. Chromitite occurs as lenses, pods, bands and disseminations. Platinum group of minerals (PGMs) occur as inclusions within chromite and silicates. The study indicates an inhomogeneous distribution of PGMs and distinct dominance of IPGEs over the PPGEs. The average ΣPGE content of chromite of KLC varies from 64 ppb to 576 ppb with Pt ranging from 5 to 495 ppb, Pd 5 to 191 ppb, Ir 3 to 106 ppb, Ru 3 to 376 ppb and Rh 3 to 135 ppb. The PGMs identified in the KLC indicate primary deposition of the IPGE, preceding chromite, indicating its orthomagmatic nature. Most of the PGM grains are usually below 10 μm. The identified PGMs are Laurite (RuS2), irarsite (Ir, As, S), iridosmine (Os, Ir), undetermined Os-Ir sulphide and Ru-Os-Ir-Zn alloys. Chromite also contains inclusions of pentlandite, millerite, chalcopyrite and pyrite. Study indicating that the KLC have orthomagmatic origin for PGE which are dominated by IPGE group and formed under surpa-subduction zone peridotite setting.https://doi.org/10.1515/geo-2015-0018platinum group of mineralschromitites and ultramafics
spellingShingle Meshram Tushar M.
Nannaware Shraddha. B.
Nannaware B.
Bhatacharjee Shantanu
Waghmare Minakshi. M.
Rajakumar T.
PGE distribution in the Chromite bearing mafic-ultramafic Kondapalli Layered Complex, Krishna district, Andhra Pradesh, India
Open Geosciences
platinum group of minerals
chromitites and ultramafics
title PGE distribution in the Chromite bearing mafic-ultramafic Kondapalli Layered Complex, Krishna district, Andhra Pradesh, India
title_full PGE distribution in the Chromite bearing mafic-ultramafic Kondapalli Layered Complex, Krishna district, Andhra Pradesh, India
title_fullStr PGE distribution in the Chromite bearing mafic-ultramafic Kondapalli Layered Complex, Krishna district, Andhra Pradesh, India
title_full_unstemmed PGE distribution in the Chromite bearing mafic-ultramafic Kondapalli Layered Complex, Krishna district, Andhra Pradesh, India
title_short PGE distribution in the Chromite bearing mafic-ultramafic Kondapalli Layered Complex, Krishna district, Andhra Pradesh, India
title_sort pge distribution in the chromite bearing mafic ultramafic kondapalli layered complex krishna district andhra pradesh india
topic platinum group of minerals
chromitites and ultramafics
url https://doi.org/10.1515/geo-2015-0018
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