摘要
熔积岩研究在沉积恢复、岩浆判别、构造研究等多方面具重要意义。目前的研究集中于熔积岩寄主和区域构造判别等,对熔积岩宿主研究较少。本文对下二叠统乌郎组二段熔积岩宿主中沉积环境敏感的微量、稀土元素开展研究。结果表明:ω(B)为23.1×10^(-6)~35.7×10^(-6),ω(Sr)为241×10^(-6)~344×10^(-6),[m(Sr)/m(Ba)]为0.49~0.98,反映出熔积岩在半咸水环境下沉积;V/(V+Ni)值为0.58~0.69,Th/U值为1.34~1.78,&U值为1.25~1.38,V/Cr值为1.26~1.74,得出熔积岩沉积水体分层,底层贫氧-弱厌氧的还原条件;Sr/Cu值为1.91~3.99,可知熔积岩沉积时期处于温暖湿热环境;ω(B)为23.1×10^(-6)~35.7×10^(-6),表明为陆相沉积。
The study of the peperite is significance in many aspects,such as sedimentary restoration,magmatic discrim-ination and structural research.At present,the research is focus on magmatic of the peperite and regional tectonic dis-crimination,but less on the sediments.In this paper,trace and rare earth elements in the sediments of peperite which Permian Wulang formation are studied.The results show that,the value ofω(B)(23.1×10^(-6)~35.7×10^(-6)),ω(Sr)(241×10^(-6)~344×10^(-6)),[m(Sr)/m(Ba)](0.49~0.98)reflects that the peperite is deposited in the brackish water environment.From the data of V/(V+Ni)(0.58~0.69),Th/U(1.34~1.78),&U(1.25~1.38),V/Cr(1.26~1.74)to know the reduction conditions of the sedimentary is oxygen poor.The value of Sr/Cu is 1.91~3.99,which indicates that the deposition period of the pe-perite is a hot environment.The valueω(B)is 23.1×10^(-6)~35.7×10^(-6),indicating continental sedimentation.
作者
杨德敏
刘陈明
那正清
杨国红
唐娇
彭明兴
Yang Demin;Liu Chenming;Na Zhengqing;Yang Guohong;Tang Jiao;Peng Mingxing(Yunnan Vocational College of Land and Resources,Kunming,Yunnan,650093,China;Panxi Geological Team,Sichuan Bureau of Geology and Mineral Exploration and Development,Xichang,Sichuan,615000,China)
出处
《新疆地质》
CAS
CSCD
2023年第2期155-158,共4页
Xinjiang Geology
基金
云南省教育厅科学研究基金(2018JJ569)资助。
关键词
乌郎组
熔积岩
地球化学
沉积环境
Wulang formation
Peperite
Geochemistry
Depositional environment
