Title: MAGMATIC, METAMORPHIC AND MIGMATIC ROCKS OF THE MOUNT JOLMO LUNGMA REGION IN SOUTHERN TIBET, CHINA
Abstract: There were three magmatic episodes in the described territory. Their sequence and distribution were discussed. There are various kinds of skarns and andalusite hornfels. The migmatites reveal potash- and sodium-metasomatism. It is suggested that the fluid of alkali-silicates was originated from the deep crust, and the alkali material themselves were primarily products of the deep rocks.Based upon their occurrence, stratigraphical position, grade of metamorphism, and index minerals, the Jolmo Lungma Group can be classified into the muscovite-, two-mica-, almandine-, staurolite- and kyanite- zones. They all represent a medium grade of metamorphism, being a progressive metamorphic sequence of the almandine-amphi-bolite-facies.The territory studied has two episodes of regional metamorphism, viz: 640-660×106 yrs of Precambrian, and 10-20× 106 yrs of Miocene. Products of the first episode of metamorphism were modified by the second episode of metamorphism, with expressions of regressive metamorphism.
Publication Year: 1973
Publication Date: 1973-01-01
Language: en
Type: article
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Cited By Count: 3
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