伊犁山间坳陷二叠系乌郎组熔积岩宿主地球化学特征及沉积环境意义  

The Geochemical Characteristics and Sedimentary Environment of the Sediments of Peperite When Permian Wulang Formation in the Yili Intermountain Depression

作　　者：杨德敏[1] 刘陈明[1] 那正清 杨国红[2] 唐娇[1] 彭明兴[1] 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)

机构地区：[1]云南国土资源职业学院,云南昆明650093 [2]四川省地质矿产勘查开发局攀西地质队,四川西昌615000

出　　处：《新疆地质》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。

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.

关 键 词：乌郎组 熔积岩 地球化学 沉积环境 

分 类 号：P618.14[天文地球—矿床学]