摘要
在甜水海地区北部发现一处新近纪浅成侵入岩岩体,对其进行岩石学特征、地球化学和LA-ICP-MS锆石U-Pb年代学研究。结果显示岩体侵位时间为(8.09±0.16)Ma,形成时代为晚中新世。地球化学分析显示,岩石具有轻稀土元素富集,铕负异常,Th、La、Hf明显富集的特征。通过类比研究,其岩浆源可能来自中上地壳,形成于印度板块与欧亚板块碰撞后青藏高原隆升的陆内构造演化过程,为地幔上拱、烘烤上地壳岩石使其局部熔融、上侵而成。
A neogene hypabyssal intrusive rock mass was found in the northern part of the Tianshuihai area.The petrological characteristics,geochemistry and LA-ICP-MS zircon U-Pb dating were studied.The results showed that the emplacement time of the rocks was(8.09±0.16)Ma and the formation age was late Miocene.Geochemical analysis shows that the characteristic of the rocks in enrichment of LREE,negative anomaly of Eu,obvious enrichment of Th,La,Hf and obvious loss of Ba and Ta.At the same time,the analogy study shows that the rocks are hypabyssal intrusive rocks,the magma source may come from the middle and upper crust,formed by the upper crust rocks partially meltedand invaded,due to baking of the arched mantle,in the process of intracontinental tectonic evolution on Tibetan plateau upliftafter the collision of the Indian plate and the Eurasian plate.
作者
赵波
李有波
陈思尧
孙勇
Zhao Bo;Li Youbo;Chen Sirao;Sun Yong(Regional Geological Survey Party,Bureau of Geology and Mineral Exploration of Sichuan Province,Chengdu,Sichuan,610213,China;Sichuan Institute of Geological Survey,Chengdu,Sichuan,610213,China)
出处
《新疆地质》
CAS
CSCD
北大核心
2020年第3期319-324,共6页
Xinjiang Geology
基金
新疆维吾尔自治区地质勘查基金项目新疆甜水海地区1∶5万I44E003007等四幅区域地质调查(K15-1-LQ07)资助。
