| 王秀全,徐书奎,赵彦巧.豫西张家河岩体LA-ICP-MS锆石U-Pb定年及成岩构造环境探讨[J].矿产勘查,2019,(2):165-173 |
| 豫西张家河岩体LA-ICP-MS锆石U-Pb定年及成岩构造环境探讨 |
| LA-ICP-MS zircon U-Pb dating and diagenetic tectonic environment of Zhangjiahe rock mass in western Henan Province |
| 投稿时间：2018-11-29 |
| DOI： |
| 中文关键词: 张家河岩体 锆石U-Pb 崤山 豫西 |
| 英文关键词: Zhangjiahe rock mass, zircon U-Pb, Lushan, western Henan |
| 基金项目:河南省两权价款地质科研项目(项目编号:豫国土资函[2015]258号,04)资助。 |
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| 中文摘要: |
| 豫西崤山与毗邻的小秦岭、熊耳山同属华北地块南缘,成矿地质条件优越。区内太华岩群主要出露新太古代中酸性侵入岩体,但这些岩体的形成时代、地球化学特征、成岩动力学背景等仍未得到深入研究和测定。文章对崤山中北部张家河富钾花岗岩体开展了LA-ICP-MS锆石U-Pb定年,显示张家河富钾花岗岩体锆石U-Pb年龄为(2500±17)Ma,形成时代为新太古代晚期；地球化学特征显示其测点数据落入I-型花岗岩系列和埃达克岩范围,富集轻稀土,亏损重稀土,LaN/YbN比值(介于8.39～34.20)大于1, Y元素含量介于11.16×10-6～12.11×10-6之间。综合认为张家河岩体具埃达克岩属性,属亚碱性同熔型花岗岩(Ⅰ型),应是新太古代晚期地壳增厚的产物。 |
| 英文摘要: |
| The Yushan Mountain in western Henan Province and the adjacent Xiaoqinling and Xiong'er Mountains belong to the same complex of Hua bears on the southern margin of the North China Block, with excellent metallogenic geological conditions. There are many intrusive rock masses in the area, but the formation age, geochemical characteristics, and diagenetic dynamics of these rock masses have not been thoroughly studied and measured. In this paper, the LA-ICP-MS zircon U-Pb dating of the Zhangjiahe rock mass in the middle and northern part of Songshan Mountain was carried out. It shows that the zircon U-Pb age of the Zhangjiahe rock mass is 2500±17 Ma, and the age is the late Neoarchean stage. Through the study of the geochemical characteristics of the Zhangjiahe rock mass, it is believed that the Zhangjiahe rock mass is of adakite nature and is subalkaline and fused granite (type I). It should be the product of the mixing effect of crust-derived magma and mantle-derived magma. |
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