论文部分内容阅读
粤西残斑岩脉是由花岗斑岩脉遭受后期地质作用改造而成的 ,具有片状构造 ,片理产状与地层围岩一致。通过对该残斑岩的颗粒锆石U -Pb年龄测定 ,莸得两条不一致线 ,它们的下交点年龄分别为 40 4±6Ma和 42 8± 17Ma ,从而确定残斑岩脉的侵入年龄为 40 4～ 42 8Ma ,属加里东期。根据上交点年龄和2 0 7Pb/2 0 6Pb年龄推断 ,其源区物质较复杂 ,包含有 1737Ma、2 16 5Ma和 2 494Ma的物质 ,暗示粤西云开隆起区存在中、古元古代以及太古宙基底。
The remnant porphyry veins in western Guangdong are reconstructed by the post-geological geochemistry of the granite porphyry veins. They have a plate-like structure and are consistent with the surrounding rocks. By determining the zircon U-Pb age of the porphyry, two inhomogeneous lines were obtained and the ages of their next crosses were 40 4 ± 6Ma and 42 8 ± 17Ma, respectively. 40 4 ~ 42 8Ma, is Caledonian. According to the age at the crossing point and the age of 207Pb / 206Pb, the source material is more complex and contains 1737Ma, 2 16 5Ma and 2 494Ma, indicating that the Middle and Early Proterozoic and the Pacific The base of the universe.