| 内蒙古扎鲁特旗白音高老组火山岩锆石U-Pb年龄、地球化学特征及其地质意义 |
| |
| 引用本文： | 王亚东,王之晟,卢天军,王晓奇,王洪志,马国祥.内蒙古扎鲁特旗白音高老组火山岩锆石U-Pb年龄、地球化学特征及其地质意义[J].矿物岩石,2019(3):17-25. |
| |
| 作者姓名： | 王亚东 王之晟 卢天军 王晓奇 王洪志 马国祥 |
| |
| 作者单位： | 核工业二四三大队 |
| |
| 基金项目： | 中国地质调查局项目“内蒙古1∶5×104工农屯（L51E021003）等六幅区域地质矿产调查”（2017021610111) |
| |
| 摘 要： | 内蒙古扎鲁特旗地区发育的白音高老组,其岩性主要为一套酸性火山岩组成。锆石U-Pb测年结果显示白音高老组火山岩的年龄为127 Ma±1.2 Ma(MSWD=0.80)。为早白垩世。岩石地球化学数据表明:白音高老组火山岩具有高硅富碱(wSiO2平均为75.84%,wNa2O+K2O平均为8.63%)、贫镁(0.05%~0.12%)、贫钙(0.18%~0.28%)的特征。相对富集元素Rb,Th和U;亏损元素Sr,Ti,P。稀土总量(ΣREE)偏低(ΣREE介于125.10×10-6~158.20×10-6之间)。(La/Sm)N介于3.15~5.20之间,轻稀土元素分馏较为明显;具有明显的负Eu异常(δEu平均值0.40);稀土元素分配模式为右倾型。研究显示,该地区火山岩具有A型花岗岩的特征,其形成机制由下地壳玄武质岩石部分熔融,与蒙古-鄂霍茨克洋的演化有关,形成于造山后的伸展环境。
|
| 关 键 词： | 扎鲁特旗 白音高老组 U-PB测年 火山岩 岩石地球化学 |
ZIRCON U-Pb AGE AND GEOCHEMICAL CHARACTERISTICS OF THE VOLCANIC ROCKS OF THE BAYAN GOL FORMATION IN THE JARUD BANNER,INNER MONGOLIA AND ITS GEOLOGICAL SIGNIFICANCE |
| |
| Wang Yadong,Wang Zhisheng,Lu Tianjun,Wang Xiaoqi,Wang Hongzhi,Ma Guoxiang.ZIRCON U-Pb AGE AND GEOCHEMICAL CHARACTERISTICS OF THE VOLCANIC ROCKS OF THE BAYAN GOL FORMATION IN THE JARUD BANNER,INNER MONGOLIA AND ITS GEOLOGICAL SIGNIFICANCE[J].Journal of Mineralogy and Petrology,2019(3):17-25. |
| |
| Authors: | Wang Yadong Wang Zhisheng Lu Tianjun Wang Xiaoqi Wang Hongzhi Ma Guoxiang |
| |
| Institution: | (The NO.243 of nuclear industry,Chifeng 024000,China) |
| |
| Abstract: | The Bayan Gol Formation in the Jarud Banner,Inner Mongolia consists of mainly acid volcanic rocks.Zircon U-Pb dating shows that the dated age of The Bayan Gol Formation volcanic rocks is 127Ma±1.2Ma(MSWD=0.80)and belongs to early Cretaceous volcanic product.Geochemical analysis indicates that the volcanic rocks are characterized by high content of w(SiO2)(average 75.84%),alkali(average 8.63%),and low w (MgO)(0.05%~0.12%),w (CaO)(0.18%~0.28%).The rocks are obviously rich in Rb,Th,U and poor in Sr,Ti and P,with low contents of ΣREE(125.10×10^-6~158.20×10^-6).Fractional distillation of HREE is obvious with Eu negative anomaly(δEu average 0.40).REE distribution pattern is right inclined type of LREE enrichment.It shows that the rhyolite in Bayan Gol Formation in the Jarud Banner is characteristic of A type granite and derived from partial melting of lower crustal basalt rocks.It is considered that the basalt is related to evolution of the Mongolian-Okhotsk Ocean and formed in a post orogenic extensional setting. |
| |
| Keywords: | Jarud Banner Bayan Gol Formation U-Pb dating volcanic rocks petrogeochemistry |
| 本文献已被 维普 等数据库收录！ |
|
