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SUPRA-SUBDUCTION ZONE ENVIRONMENT AND ECONOMIC potentiAL OF THE NIDAR OPHIOLITE OF INDUS SUTURE ZONE, EASTERN LADAKH,THE HIMALAYA

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地学前缘 2000年第S1期7卷 434-435页

作者： N.Siva Siddaiah[WT5,5”BX](Wadia Institute of Himalayan Geology,33,General Mahadeo Singh Road,Dehra Dun\|248001,India)

Ophiolites along the indus Suture Zone (ISZ) are important not only for the information they provide about the India\|Eurasia collision,but may also contain economic mineral deposits (chrome,noble metals,and Ni\|sulfides).Several ophiolites occur in the ISZ,and the Nidar ophiolite is one that occurs on the eastern *** paper presents the geochemistry of ultramafic rocks from the Nidar ophiolite to understand tectonic environment and economic *** ophiolite consists of pillow lavas,radiolarian cherts,rodingites,peridotites and *** lower part of the ophiolite consists of tectonized harzburgite,hosting dunite enveloped podiform *** transition zone between upper mantle and lower oceanic crust is characterized by serpentinized dunite with disseminations of *** in Nidar have low whole\|rock values of w (TiO\-2)(0 02%～0 03%), w (Al\-2O\-3)(2%～3%), w (CaO)(0.5%), w (Zr)(40×10 -6 ),and w (Y)(30×10 -6 ),and enriched in refractory elements such as w (Cr)((3000～5000)×10 -6 )and w (Ni)((3000～4000)×10 -6 ).Thus,the Nidar peridotites are more depleted in elements partitioned into the liquid,such as Al and Ca and the moderately refractory element *** peridotites have fractionated chondrite\|normalized PGE *** geochemical characteristics suggests their formation by high degrees of partial melting in a supra\|subduction zone environment,where melting was enhanced by addition of *** Cr # of 0.82 in the chromite of the chromitites also suggests a depleted mantle source and a supra\|subduction zone environment for the host *** formed in supra\|subduction zone setting are very conducive for many metallic and non\|metallic mineral deposits.

关键词： supra\|subduction zone ophiolites mineral potenti al Himalaya

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