Unusual Mantle Mineral Group from Chromitite Orebody Cr-11 in Luobusa Ophiolite of Yarlung-Zangbo Suture Zone, Tibet  

作　　者：徐向珍 杨经绥 陈松永 方青松 白文吉 巴登珠 

机构地区：[1]Key Laboratory for Continental Dynamics of the Ministry of Land and Resources,Tibet Center for Continental Dynamics,Institute of Geology,Chinese Academy of Geological Sciences [2]The Second Field Team,Geology Bureau of Xizang

出　　处：《Journal of China University of Geosciences》2009年第2期284-302,共19页中国地质大学学报（英文版）

基　　金：supported by China Geological Survey (Nos. 1212010610107 and 1212010610105);the National Natural Science Foundation of China (No. 40610098)

摘　　要：A wide variety of unusual mantle has been reported from podiform chromitite orebodies Cr-31 and Cr-74 in the Luobusa （罗布莎） ophiolite, Tibet. A detailed investigation of chromitite ore- body Cr-ll, located in the Kangjinla （康金拉） district at the eastern end of the ophiolite, has revealed many of the same minerals, including diamond, moissanite, and some native elements, alloys, oxides, sulphides, silicates, carbonates, and tungstates. This orebody is particularly rich in diamonds, with over 1 000 grains recovered from about 1 100 kg sample of chromitite. More detailed studies and experiments are needed to understand the origin and significance of these unusual minerals because they have not been found in situ. It is a great breakthrough in mineralogical research that we have picked up more than 40 kinds of minerals from the Kangjinla chromite deposit in Luobusa. It is notable that a large amount of diamonds were firstly discovered from the Kangjinla chromite deposit as well as many other unusual minerals, such as moissanites, rutiles, native irons, and metal alloys. Especially, that diamond was found again in different chromitites in the same ophiolite belt provided new key evidence for discussing the origin of the diamond and the hosted chromitite and ophiolite. The mantle mineral group in Tibet has great significance in mineralogy and geodynamics.A wide variety of unusual mantle has been reported from podiform chromitite orebodies Cr-31 and Cr-74 in the Luobusa （罗布莎） ophiolite, Tibet. A detailed investigation of chromitite ore- body Cr-ll, located in the Kangjinla （康金拉） district at the eastern end of the ophiolite, has revealed many of the same minerals, including diamond, moissanite, and some native elements, alloys, oxides, sulphides, silicates, carbonates, and tungstates. This orebody is particularly rich in diamonds, with over 1 000 grains recovered from about 1 100 kg sample of chromitite. More detailed studies and experiments are needed to understand the origin and significance of these unusual minerals because they have not been found in situ. It is a great breakthrough in mineralogical research that we have picked up more than 40 kinds of minerals from the Kangjinla chromite deposit in Luobusa. It is notable that a large amount of diamonds were firstly discovered from the Kangjinla chromite deposit as well as many other unusual minerals, such as moissanites, rutiles, native irons, and metal alloys. Especially, that diamond was found again in different chromitites in the same ophiolite belt provided new key evidence for discussing the origin of the diamond and the hosted chromitite and ophiolite. The mantle mineral group in Tibet has great significance in mineralogy and geodynamics.

关 键 词：diamond CHROMITITE Kangjinla Luobusa Tibet. 

分 类 号：P597.3[天文地球—地球化学]