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关于东南极拉斯曼丘陵夕线片麻岩类原岩恢复问题的讨论
14 1 ( ( ) ; ) Vol. 14 No. 1
2007 1 Earth Science Frontiers ( China University of Geosciences, Beijing; eking University) Jan. 2007
1 1 1 2
任留东 , 耿元生 , 王彦斌 , 赵 越
11 , 100037
21 , 100081
1 1 1 2
Ren Liudong , Geng Yuansheng , Wang Yanbin , Zhao Yue
11 I nst it ut e of Geol og y , Ch ine se A ca demy of Ge ol ogi cal S ci ence s, Beij i ng 100037, Chi na
21 I nst it ut e of Geomechani cs , Ch inese A cad emy of Ge ol ogi cal S ci ence s, Beij i ng 100081, Chi na
Ren Liudong, Geng Yuansheng, Wang Yanbin, et al1 On the protolith of the sillimanite gneisses in the Larsemann Hills, East
Antarctica.Earth Science Fr ontiers , 200 , 14(1) : 0 5-084
Abstract: T he protoliths of the sillimanite gneisses from the Larsemann H ills, east Antarctica, and their adja-
cent area may be greywacke, sub-greywacke, quartz sandstone, pelite or shale. T he aluminum rich sediments
such as clays or shale need not correspond to sillimanite-rich gneisses. No known argillaceous rock equals to
sillimanite-rich gneiss in chemical composition. The source rock f rom which the sillimanite gneisses derive is
probably biotite plagioclase gneiss in the study area. It is the deformation-metamorphism process under pres-
sure and temperature condition, not the original rock composition, t hat controls the presence of sillimanite.
We suggest t hat t he sillimanite gneiss is a mixture of materials from the migrating felsic melt, the biotite-pla-
gioclase gneiss undergoing partial melting and the rest ites after the melt is removed. During metamorphism and
sillimanite formation the original rock changes its chemical composition and, t
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