晋陕交界涑水杂岩LA-ICP-MS锆石U-Pb年龄和Hf同位素组成及其地质意义
发布时间：2018-10-10 13:26
【摘要】：涑水杂岩作为华北克拉通南部早前寒武纪变质基底杂岩的重要组成部分,以中条山地区出露最好且研究程度最高。在晋陕交界处的韩城和河津地区也有零星的古老变质基底杂岩出露,通常认为是中条山地区涑水杂岩的西延。用LA-ICP-MS锆石U-Pb方法测得研究区内的基底岩石角闪斜长片麻岩、透辉斜长片麻岩和二长花岗片麻岩原岩的形成年龄分别为2260±28Ma、2053±34Ma和2098±27Ma,表明晋陕交界处涑水杂岩的形成年龄明显小于中条山地区的涑水杂岩,其形成时代主要应为古元古代早期,而非太古宙。锆石Hf同位素显示,所分析的锆石多数具有低ε_(Hf)(t)值,最低可达-6,其二阶段模式年龄为2630~2933Ma,表明这些形成于古元古代的岩石为太古宙岩石再循环的产物,暗示在晋陕交界处可能存在太古宙的古老地壳物质,同时也支持华北克拉通南部太古宙地块划分的推论。
[Abstract]:Sushui complex is an important part of the early Precambrian metamorphic basement complex in the southern North China Craton. There are also sporadic old metamorphic basement complexes in Hancheng and Hejin areas at the junction of Shanxi and Shaanxi, which are generally considered to be the westward extension of Sushui complex in Zhongtiaoshan area. The hornblende gneiss of the basement rock in the study area was measured by LA-ICP-MS zircon U-Pb method. The age of formation of the granitic gneiss is 2260 卤28 Ma, 2053 卤34Ma and 2098 卤27 Ma, respectively, indicating that the age of the Sushui complex at the junction of Shanxi and Shaanxi is obviously smaller than that of the Sushui complex in Zhongtiaoshan area. The main age of its formation is early Gu Yuan. Not Archean. The Hf isotopes of zircon show that most of the zircon analyzed have low 蔚 _ (Hf) (t) value and the lowest 蔚 _ (Hf) (t) value, with a two-stage model age of 2630 ~ 2933 Ma, indicating that the rocks formed in Gu Yuan ancient times are the products of the recirculation of Archean rocks. It suggests that the Archean ancient crustal material may exist at the junction of Shanxi and Shaanxi, and it also supports the inference of the division of Archean blocks in the southern part of North China Craton.
【作者单位】： 大陆动力学国家重点实验室 西北大学地质学系;
【基金】：国家自然科学基金项目《国家创新研究群体:大陆构造与动力学》(批准号:41421002)、《华北克拉通南缘早前寒武纪构造-热事件及其地质意义》(批准号:41672188)、《华北克拉通南缘豫陕地区古元古代构造-热事件研究》(批准号:41272004)
【分类号】：P597;P588.3
本文编号：2261952
[Abstract]:Sushui complex is an important part of the early Precambrian metamorphic basement complex in the southern North China Craton. There are also sporadic old metamorphic basement complexes in Hancheng and Hejin areas at the junction of Shanxi and Shaanxi, which are generally considered to be the westward extension of Sushui complex in Zhongtiaoshan area. The hornblende gneiss of the basement rock in the study area was measured by LA-ICP-MS zircon U-Pb method. The age of formation of the granitic gneiss is 2260 卤28 Ma, 2053 卤34Ma and 2098 卤27 Ma, respectively, indicating that the age of the Sushui complex at the junction of Shanxi and Shaanxi is obviously smaller than that of the Sushui complex in Zhongtiaoshan area. The main age of its formation is early Gu Yuan. Not Archean. The Hf isotopes of zircon show that most of the zircon analyzed have low 蔚 _ (Hf) (t) value and the lowest 蔚 _ (Hf) (t) value, with a two-stage model age of 2630 ~ 2933 Ma, indicating that the rocks formed in Gu Yuan ancient times are the products of the recirculation of Archean rocks. It suggests that the Archean ancient crustal material may exist at the junction of Shanxi and Shaanxi, and it also supports the inference of the division of Archean blocks in the southern part of North China Craton.
【作者单位】： 大陆动力学国家重点实验室 西北大学地质学系;
【基金】：国家自然科学基金项目《国家创新研究群体:大陆构造与动力学》(批准号:41421002)、《华北克拉通南缘早前寒武纪构造-热事件及其地质意义》(批准号:41672188)、《华北克拉通南缘豫陕地区古元古代构造-热事件研究》(批准号:41272004)
【分类号】：P597;P588.3
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