It is well-known that a fairly large tract of country of Sikang (ChineseTibet) is occupied by various kinds of metamorphic rocks; but our knowledgeof their nature and origin is as yet far from complete. In thi8 connexion, the
.1946. A Preliminary Study of Progressive Metamorphism in the Country around Tienwan, Sikang[J]. Acta Geologica Sinica(),26(0):129-161
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