| 甘肃多坝沟地区黑云斜长片麻岩锆石U-Pb年龄和Hf同位素特征 |
| |
| 引用本文： | 朱涛,王洪亮,徐学义,赵燕,李智佩,朱小辉.甘肃多坝沟地区黑云斜长片麻岩锆石U-Pb年龄和Hf同位素特征[J].地质通报,2018,37(4):682-692. |
| |
| 作者姓名： | 朱涛 王洪亮 徐学义 赵燕 李智佩 朱小辉 |
| |
| 作者单位： | 国土资源部岩浆作用成矿与找矿重点实验室/中国地质调查局造山带地质研究中心/中国地质调查局西安地质调查中心;大陆动力学国家重点实验室;西北大学地质学系 |
| |
| 基金项目： | 国家自然科学基金项目《敦煌地区高镁闪长岩成因与深部地球动力学过程研究》（批准号：41702235）、中国地质调查局项目《西北基础地质综合调查与片区总结》（编号：1212011220649）和《祁连成矿带肃南—大柴旦地区地质矿产调查》（编号：DD20160012） |
| |
| 摘 要： | 通过对多坝沟地区敦煌杂岩中黑云斜长片麻岩LA-ICP-MS锆石U-Pb年龄和Lu-Hf同位素的研究,对敦煌杂岩的形成时代和敦煌地块的前寒武纪地壳生长演化进行探讨。锆石U-Pb年代学研究表明,710Ma代表了敦煌杂岩的最大沉积时代,黑云斜长片麻岩发育422Ma的早古生代变质事件,表明敦煌地块卷入了早古生代古亚洲洋俯冲-碰撞的演化过程。锆石Hf同位素研究结果表明,敦煌地块具有幕式生长特征,经历了约2.7Ga、2.5Ga、2.3Ga、2.0Ga和1.8Ga多个地壳生长时期。黑云斜长片麻岩发育的约0.9Ga和约0.8Ga的峰值年龄表明,敦煌地块新元古代构造热事件可与塔里木克拉通对比。
|
| 关 键 词： | 多坝沟 敦煌杂岩 碎屑锆石U-Pb年龄 锆石Lu-Hf同位素 |
| 收稿时间： | 2017/7/7 0:00:00 |
| 修稿时间： | 2018/2/6 0:00:00 |
Zircon U-Pb age and Hf isotopes of the biotite plagioclase genesis in Duobagou area, Gansu Province |
| |
| ZHU Tao,WANG Hongliang,XU Xueyi,ZHAO Yan,LI Zhipei and ZHU Xiaohui.Zircon U-Pb age and Hf isotopes of the biotite plagioclase genesis in Duobagou area, Gansu Province[J].Geologcal Bulletin OF China,2018,37(4):682-692. |
| |
| Authors: | ZHU Tao WANG Hongliang XU Xueyi ZHAO Yan LI Zhipei and ZHU Xiaohui |
| |
| Institution: | Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Ministry of Land and Resources/Research Center for Orogenic Geology/CGS, Xi''an Center of Geological Survey, CGS, Xi''an 710054, Shaanxi, China,Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Ministry of Land and Resources/Research Center for Orogenic Geology/CGS, Xi''an Center of Geological Survey, CGS, Xi''an 710054, Shaanxi, China,Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Ministry of Land and Resources/Research Center for Orogenic Geology/CGS, Xi''an Center of Geological Survey, CGS, Xi''an 710054, Shaanxi, China,State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi''an 710069, Shaanxi, China,Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Ministry of Land and Resources/Research Center for Orogenic Geology/CGS, Xi''an Center of Geological Survey, CGS, Xi''an 710054, Shaanxi, China and Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Ministry of Land and Resources/Research Center for Orogenic Geology/CGS, Xi''an Center of Geological Survey, CGS, Xi''an 710054, Shaanxi, China |
| |
| Abstract: | The LA-ICP-MS zircon U-Pb age and zircon Lu-Hf isotope were analyzed for biotite-plagioclase gneiss from Duoba-gou area, Dunhuang terrain, with the purpose of determining the formation age of the Dunhuang complex and discussing the crustal growth and evolution history of the Dunhuang terrain during Precambrian. Zircon U-Pb dating results indicate that the maximum depositional age of supracrustal rocks from the Dunhuang complex is ca. 710Ma. Additionally, the studied biotite-plagioclase gneiss indicates a metamorphic event at 422Ma, suggesting that the Precambrian Dunhuang terrain might have been involved in the subduc-tion-collision process of the Paleo-Asian Ocean during Early Paleozoic. Zircon Hf isotopes show that the Dunhuang terrain experi-enced episodic crustal growth events at ca. 2.7Ga, ca.2.5Ga, ca. 2.3Ga, ca. 2.0Ga and ca. 1.8Ga, suggesting episodic crustal growth. It is considered that the tectonic attribute could be compared with that of the Tarim craton during Neoproterozoic, as shown by the peak age at ca. 0.9Ga and ca. 0.8Ga. |
| |
| Keywords: | Duobagou area Dunhuang complex detrital zircon U-Pb age zircon Lu-Hf isotope |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地质通报》浏览原始摘要信息 |
| 点击此处可从《地质通报》下载免费的PDF全文 |
|
