| 梁猛,王之晟,马国祥,王晓奇,李继木.河北围场朝阳地晚泥盆世侵入岩的发现及锆石U-Pb年代学证据[J].矿产勘查,2020,11(2):221-231 |
| 河北围场朝阳地晚泥盆世侵入岩的发现及锆石U-Pb年代学证据 |
| Discovery and zircon U-Pb ages characteristics of Late Devonian intrusive rocks in Weichang Chaoyangdi,Hebei Province |
| 投稿时间：2019-07-12 |
| DOI： |
| 中文关键词: 二长花岗岩 锆石U-Pb年龄 地球化学特征 古亚洲洋俯冲 晚泥盆世侵入岩 朝阳地 围场 河北省 |
| 英文关键词: monzonitic granite,U-Pb age of zircon,geochemical characteristics,Ancient Asian Ocean subduction,Late Devonian intrusive rocks,Chaoyangdi, Weichang,Hebei Province |
| 基金项目:中国地质调查局项目(1212011120674、1212011220420)和中国核工业地质局铀矿地勘费项目(编号:201910)联合资助。 |
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| 中文摘要: |
| 河北省围场县朝阳地晚泥盆世侵入岩岩性主要为二长花岗岩,LA-ICP-MS锆石U-Pb测年为(375.3±2.2)Ma和(382.8±2.1)Ma；二长花岗岩A12O3含量14.41%～17.08%、CaO 0.77%～3.15%、(K2O+Na2O)7.03%～8.63%。铝饱和指数A/CNK为0.92～1.30,在CIPW标准矿物计算中出现刚玉分子,未出现透辉石,表明该岩体为一套强过铝质亚碱性S型花岗岩。(La/Yb)N=9.91～29.93,LREE/HREE=11.35～16.61,δEu无异常,在配分曲线上显示左高右低的特征。微量元素富集Rb、Ba、K、Sr、Hf等大离子亲石元素,亏损Ta、Nb、P、Ti等高场强元素,由此可看,研究区晚泥盆世花岗岩属较典型的S型岛弧花岗岩。结合岩石地球化学、区域地质特征,认为该期侵入岩为岛弧构造背景,其形成与古亚洲洋向南俯冲有关。 |
| 英文摘要: |
| According to this study,the lithology of the Late Devonian intrusive rocks in Chaoyangdi,Weichang county,Hebei Province is mainly monzonitic granite,and the U-Pb dating of zircon is 375. 3Ma±2. 2Ma and 382. 8Ma±2. 1Ma. The Composition content of monzonitic granite is A12O314. 41%-17. 08%,CaO 0. 77%-3. 15%,(K2O+Na2O)7. 03%-8. 63%. Aluminum saturation index A/CNK is 0. 92-1. 30. Corundum molecule appears in CIPW standard mineral calculation,while diopside does not appear,indicating that this rock mass is a set of strong super aluminoussubalkaline S-type granite. (La/Yb) N=9. 91-29. 93,LREE/HREE=11. 35-16. 61,δEu is normal,showing the characteristics of high left and low right on the partition curve. Trace elements enriched large ionic lithophile elements such as Rb,Ba,K,Sr,Hf,etc.,and depleted high-field elements such as Ta,Nb,P,Ti,etc. This rock mass belongs to island arc granite. It can be seen that the Late Devonian granite in the study area is a typical S-type island arc granite. According to the petrogeochemistry and regional geological characteristics,the intrusive rocks in this period are considered to be the island arc tectonic background,which is related to the southward subduction of the Ancient Asian Ocean. |
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