Abstract Views :213 |
PDF Views:2
Authors
Affiliations
1 Wadia Institute of Himalayan Geology, Northeast Unit, Itanagar-791113, IN
2 Department of Geology, D.M. College of Science, Imphal-795001, IN
3 Departrnent of Geology, D.M. College of Science, Imphal-795001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 5 (2008), Pagination: 739-743
Abstract
Platinum Group Elements (PGE) (Os, Ir, Ru, Rh, Pd, Pt) with Au and Ag content in ultramafic rocks (harzburgite, Iherzolite, wehrlite, dunite and tectonite) from the northern part (Ukhrul area) of the Manipur Ophiolite Complex (MOC), Indo-Myanmar range has been discussed briefly. The ultramafic rocks shows higher concentration of Palladium-group PGE (PPGE) (Rh = 4.4-6.6 ppb; Pd = 336-458 ppb; Pt = 34.6-36.4 ppb; Au = 38.8-116.8 ppb) and Ag (94-145 ppb) than the Iridium-Group PGE (IPGE) (0s = 2.4-5p.8pb; Ir = 3.2-4.8 ppb; Ru = 5.2-7 ppb). They are characterized by overall enrichment of PGE concentration (ΣPGE = 393.6-518.2 ppb) and high ratio of (Pt+Pd)/(Os+Ir+Ru) (24.18-35.23 ppb). The constancy of the ratios Ir/Os, Ru/Os, Ru/Ir suggests that these elements were in thermodynamic equilibrium during the crystallization. Cu/Pd ratios (1183-1473 ppb) in these rocks are lower than those in primitive mantles, probably suggests that the rocks contain cumulus sulphides. Preliminary studies indicate high concentration of PGE in the ultramafic rocks of MOC and further detail study is warranted to assess the economic feasibility of Platinum Group Elements and Gold.
Keywords
Platinum Group of Element, Ultramafics, Manipur Ophiolite Complex, Indo-Myanmar Range.
