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加拿大苏必利尔省南部Agawa混合岩区的新U-Pb矿物年龄与邻近高级变质和低级变质区已发表的年龄一起,揭示了随深度加深,深成岩和变质过程有逐渐变年轻的图式,并提供了控制晚期太古宙克拉通化机制的见解。已报道了下列年龄:(1)第一代锆石年龄约2670Ma,第二代锆石年龄约2660Ma和独居石年龄为2649±1.5Ma,上述矿物均采自混合岩中的淡色层;(2)第一代锆石年龄
The new U-Pb mineral age in the Agawa mixed rock area in southern Superior, Canada, together with the published age of the adjacent high-grade metamorphic and lower-grade metamorphic areas, reveals a gradual, younger pattern of deep diagenesis and metamorphism as depth increases The idea of controlling the mechanism of the late Archean cratonization. The following ages have been reported: (1) the first generation of zircons is about 2670 Ma, the second generation of zircons is about 2660 Ma and the age of the monazite is 2649 ± 1.5 Ma, all of the above minerals are taken from the light-colored layers of the mixed rock; (2 The first generation of zircon age