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... Hutuo Group is distributed mainly on the southern flank of the Wutai Moutains with a total area of 1700 km 2 , and unconform- ably overlies the Wutai Group and late Archean granitoids (Fig. 3) (Bai, 1986;Wu et al., 2008;Zhang et al., 2006a;Du et al., 2012). The Hutuo Group can be subdivided into three lithostratigraphic units, from bottom to top, the Doucun Subgroup, Dongye Subgroup and Guojiazhai Subgroup. They are mainly composed of low-green- schist facies metamorphosed sedimentary rocks, including con- glomerate, sandstone, phyllite, slate, dolomitic marble, with basic volcanic rocks locally. Wu et al. (1986) first obtained an ID-TIMS zircon U-Pb age of 2366 + 103/À94 Ma from basalt of the Qingshi- cun Formation of the Doucun Subgroup, which suggested that the Hutuo Group formed in the Paleoproterozoic. Wilde et al. (2004b) reported a SHRIMP zircon U-Pb age of 2087 ± 9 Ma from meta-fel- sic tuff in the Wutai area, further constraining the age of the Hutuo Group as Paleoproterozoic. Du et al. (2010) obtained the SHRIMP zircon U-Pb age of 2140 ± 9 Ma from the basalt-andesite at the base of the Hutuo Group, and defined the base of the Hutuo Group as middle Paleoproterozoic in ...
