四川得荣地区格绒组火山岩地球化学特征及构造意义  

Geochemical Characteristics and Tectonic Significance of the Volcanic Rocks of the Gerong Formation in Derong Area,Sichuan Province

作　　者：骆志红[1] 贾志泉[1] 邓红 郝娇 罗林洪 LUO Zhihong;JIA Zhiquan;DENG Hong;HAO Jiao;LUO Linhong(Geological Team,BGEEMRSP,Chengdu 611230)

机构地区：[1]四川省地质矿产勘查开发局一0八地质队,成都611230

出　　处：《四川地质学报》2023年第3期501-504,511,共5页Acta Geologica Sichuan

基　　金：中国地质调查局《四川省白松-奔都地区1:5万H47E018014、H47E019014、H47E019015、H47E020014、H47E020015五幅区域地质矿产调查》项目(编码:12120114014701)项目资助。

摘　　要：格绒组是产于中咱地块的一套以浅海碳酸盐岩为主,局部含细碎屑岩和基性火山岩的岩石组合,在得荣县城一带有着巨厚的海相玄武岩,是古生代扬子陆块西缘被动陆缘裂谷盆地的产物。格绒组火山以玄武岩为主,含少量玄武岩安山岩,主量元素中具有高Na、Ti、低K的主量元素岩石地球化学特征,具有轻稀土富集、重稀土亏损,大离子亲石元素和放射性元素不同程度富集,非活动性元素低度亏损的微量元素特征。根据对地层沉积环境分析结合微量元素构造判别,格绒组火山岩产出于板内构造环境。The Gezong Formation is a set of rock assemblages mainly composed of shallow marine carbonate rocks,and locally containing fine clastic rocks and basic volcanic rocks.There are extremely thick marine basalts in the area of Derong County,which is the products of passive continental rift basin in the western margin of the Yangtze craton.The Gezong Formation volcano is dominated by basalt,containing a small amount of basalt andesite,and has geochemical characteristics of high Na,Ti and low K in the main elements.The Gezong Formation volcano samples are enriched in light rare earth enrichment,depleted in heavy rare earth.The large ion lithophile elements and radioactive elements are enriched to different degrees,and lowerdepleted the inactive elements.According to the analysis of sedimentary environment and structural discrimination of trace elements,the volcanic rocks of Gezong formation are formed in the tectonic environment of the plate.

关 键 词：格绒组 岩石地球化学 玄武岩 被动陆缘 裂离 

分 类 号：P595[天文地球—地球化学]