| 火久伟,黄登鹏,李生宝,晏齐胜.西藏打加错东地区典中组火山岩地球化学特征、年代学特征及地质意义[J].矿产勘查,2019,(6):1285-1295 |
| 西藏打加错东地区典中组火山岩地球化学特征、年代学特征及地质意义 |
| Geochemical , chronological characteristics and geological significance of the volcanic rocks of the Dianzhong Formation in the eastern Dajiacuo area, Tibet |
| 投稿时间：2019-01-10 |
| DOI： |
| 中文关键词: 打加错东 地球化学特征 锆石U-Pb 俯冲-碰撞 典中组 |
| 英文关键词: the eastern Dajiacuo,geochemical characteristics,zircon U-Pb,subduction-collision,Dianzhong formation |
| 基金项目:中国地质调查局项目(编号:12120113034400)资助。 |
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| 中文摘要: |
| 林子宗群火山岩是在青藏高原南部广泛发育的新生代火山岩,形成于新特斯洋闭合向印度－亚洲大陆碰撞过渡的背景下。在昂仁县打加错东一带,林子宗群火山岩各组地层的界定主要基于区域地层对比,且未进行细致的年代学研究,尤其是针对本区林子宗群火山岩地层的主体典中组火山岩地层,未进行细致的同位素测年和地球化学特征研究。为进一步了解位于冈底斯带中西部打加错东地区的林子宗群火山岩与其东部火山岩之间的关系,笔者对打加错东地区的林子宗群火山岩进行岩石学、岩石地球化学、锆石U-Pb同位素测年等研究,来进一步确定该区火山岩的形成年龄、地球化学特征及其岩浆演化过程,并探讨打加错东地区林子宗群火山岩的成因及其构造动力学意义。 |
| 英文摘要: |
| Linzizongqun volcanic rock is a new generation of volcanic rock widely developed in the southern part of the Qinghai-Tibet Plateau. It was formed under the background of the transition from the closure of the Xintesi to the Indian-Asian continent collision. In the east area of Dajiacuo in Anren County, the definition of each group of Linzizongqun volcanic rocks is mainly based on regional stratigraphic comparisons. No detailed chronology studies have been conducted, especially for the main body of the Linzizongqun volcanic rock strata in this area. The volcanic rock formation, No detailed isotopic dating and geochemical characteristics were studied. In order to limit the relationship between the Linzizongqun volcanic rock in the Sandsan region in the central and western part of the Ganges Belt and its eastern volcanic rock, the author conducted a Zircon U-Pb isotope geochemical survey of the Linzizongqun volcanic rock in the eastern part of the Karma region. To determine the formation age, geochemical characteristics and magmatic evolution of volcanic rocks in the area, the genesis and tectonic dynamics of the volcanic rocks in the East are further discussed. |
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