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Reorted in the present paper are some preliminary results of the studies on the petrochemistry and mineral compositions of various skarn zones in the Dapingdi iron deposit,the chemical compositions of iron ore and magnetite,and trace elements,sulfur isotopic compositions and F contents of skarns and iron ore.On the hasis of these data the authors have discussed the possibie relations between skarnization and the formation of iron ore.Moreover,the principal factors controlling skarnization and related mineralization are also discussed.It is suggested that skarnization and related mineralization are mainly controlled by the chemical composition,temperature,and pH and Eh of ore solutions.Pressure can only play a little role although it should be taken into consideration. 相似文献
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Melting experiments have been carried out on major rock types from the three rock belts in Southern Xizang. These rocks, being quite different in chemical composition, are representative of granites of Late Yenshanian, Early Himalayan and Late Himalayan periods in this area, Experimental water pressures are eontrolled at 2kb. Results show the beginning temperatures of melting for the seven rock types are : Gubug tourmaline-muscovite granite 615℃, Zayu coarse-grained gneiesose biotite-granite 635℃, Kangmar finegrained gneissose two-mica granite 640℃,Dala gneissese two-mica granite 645℃, Quxu biotite granite 660℃, Lhasa granodiorite 700℃, and Gyubge hypersthene diorite 740℃. The beginning temperature of melting decreases with decreasing granite age.Spatially the temperature of formation drops progressively southwards from Kangdese through Lhagoi Kangri to Himalaya rock belt. Additionally, the beginning temperature of melting varies with the contents of mafic minerals and differentiation index of the rocks. Our experimental and geological data suggest that the three rock belts in Southern Xizang are all of magmatic origin. Himalaya and Lhagoi Kangrl rock belts arc stemed from partial melting of continental material, whereas Kangdese rock belt probably from remelting or partial melting of oceanic crustal material. 相似文献
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