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PLATINUM-GROUP ELEMENTS MINERALIZATION IN THE OPHIOLITES OF INDUS SUTURE ZONE, EASTERN LADAKH,THE HIMALAYA

地学前缘 2000年第S1期7卷 428-429页

作者： N.Siva Siddaiah\+1, A.Masuda\+2[WT5,5”BX](1 Wadia Institute of Himalayan Geology,33,General Mahadeo Singh Road,Dehra Dun\|248 001,India 2 Department of Chemistry,The University of Electro\|Communications,Chofu,Tokyo 182,Japan)

Platinum\|Group Elements (PGE) along with other highly siderophile elements (HSE) are quantitatively fractionated into the core and mantle,leaving the crust strongly depleted during the formation of the ***,the transfer of PGE and other HSE from the mantle may occur by tectonic emplacement of mantle material into the crust or by crystallization of the mantle derived magma in the *** formation and emplacement of ophiolites,is therefore,a suitable transfer mechanism in the enrichment of PGE and other metallic mineral *** of this,in recent years,a great deal of attention is being paid in studying the ophiolites in order to better understand the core\|mantle interaction,chemical evolution of the upper mantle and to explore their noble metal *** ophiolites along the Indus Suture Zone (ISZ) in the Himalayas are tectonically related to India\|Eurasia *** their detailed geochemical evolution history and economic potentiality (chromite,PGE,gold and Ni\|sulfides) is not evaluated so *** ophiolite of the eastern Ladakh is one of the ophiolitic suites along the *** general geology of the area was presented in several research *** paper presents the geology,mineralogy and geochemistry of the chromitites and reports on the first platinum\|group elements mineralization to have been discovered.

关键词： PGE concentrations nidar ophiolite Indus Suture Zone Him alayas

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OCCURRENCE OF HIGH-PRESSURE RODINGITES IN THE OPHIOLITES OF INDUS SUTURE ZONE, EASTERN LADAKH,THE HIMALAYA:TECTONIC AND METALLOGENIC SIGNIFICANCE

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地学前缘 2000年第S1期7卷 115-116页

作者： N.Siva Siddaiah[WT5,5”BX](Wadia Institute of Himalayan Geology,33,General Mahadeo Singh Road,Dehra Dun\|248001,India,Fax:91\|135\|625212)

Recently,considerable attention is being paid in studying the high\|pressure (rodingites and eclogites etc)crustal segments for understanding the architecture and evolution of collision *** paper presents the geology,mineralogy and geochemistry of the rodingites,the first reported occurrence in eastern Ladakh,the *** ophiolite is one of the well exposed,nearly a complete ophiolite of the Indus Suture Zone present in the eastern *** studies across the nidar ophiolite in the nidar—Kyun Tso section unraveled the occurrence of relatively strongly developed *** are very hard and *** occur as layers and also as boudins within and at the contacts of the *** rodingites are fine to medium *** is the dominant rodingite mineral and occurs as well developed *** places grossular has coronitic ***,clinozosite,rutile and opaques are the other main Ca\|rich minerals present in *** matrix of the rodingite minerals is highly *** rodingite mineral assemblage indicates the development of rodingite in the pressure and temperature range of 18～25 kbar and 700 to 800℃,*** have high abundances (mass fraction) of CaO (10%～12%) and Al\-2O\-3 (12%) contents and generally low in SiO\-2 (46%) and MgO (7%～8%) *** have chondrite\|normalized Rare Earth Element (REE) abundances of 25 to 40× on the LREE and 37 to 50× on the MREE and 15 to 24× on the *** the REE patterns tend to be concave\|upwards,or relatively light\|REE depleted with almost no Eu\|*** geologic occurrence,the mineralogy and geochemical (major,trace and REE) data of the rodingites indicate that they were initially gabbros/basalt that have undergone Ca\|metasomatism during serpentinization,followed by high\|pressure recrystallization to rodingites.

关键词： high\|pressure rodingites nidar ophiolite ISZ Himalaya

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