The amphibolite metamorphic zone located in Wulawusu-Deyanqimiao area ismetamorphosed amphibolite factes.The metamorphic grade, distribution,lithology, lithochemistry and REE patterns in theregion indicate that amphibolitemetamorphic zones of Wulawusu and Deyanqimiao are the same in forming environment and tectonic genesis.There are three whole-rock samples in Wulawusuzone and five in Deyanqimiao from amphibolite have been analysed and age ofSin -Nd isochron, (607 ? 46.5) Ma and (638 ? 13.5) Ma, has been determined.The data shows that the zones were not only same in forming period but alsopassed the stage of extended falled into pieces evolved in late Proterozoic-earlyPaleozoic.Sin-Nd isotopic isochron age represents the beginning of continentalmargin extended falled into pieces evolved.
Zhang Chen,Li Maosong,He Guoqi et al. AGE OF Sm -Nd ISOTOPIC ISOCHRON OF AMPHIBOLITE FACIES METAMORPHIC ZONE AND ITS SIGNIFICANCE IN WULAWUSU-DEYANQIMIAO AREA OF INNER MONGOLIA[J]. Chinese Journal of Geology, 1996, (1): 65-70.