Abstract: Based on the study of the genesis of granite in Dashiqiao borate district, considers that the granite in the area is a kind of stratified migmatitized granite. The direct result of this hypothesis is the discovery of three mediumsized borate deposits in Dashiqiao area. The granite, which is transitional to its host rock granulite, possesses some special structure and texture, fluctuating largely in its chemical component concentration. Granite displays an oversaturated Al, a higher AKCN and a higher Ti. Its petrochemical components and oxygen isotope δ¹⁸O of higher than 10‰ reveal features of migmatization. The granite is consistent with its host rock granulitite in REE. In granite, LR/HR is 3.86 on average, negative Eu anomaly is evident, δEu is 0.62 and Eu/Sm is 0.163 on average, suggesting its similarity to crust granites and sedimentary rocks. Hence, the granite in the area is considered as stratified migmatized granite, rather than magmatic granite formed by diapirism.

Key words: Dashiqiao borate deposit, migmatized granite, petrochemistry, REE