古地理学报
古地理學報
고지이학보
JOURNAL OF PALAEOGEOGRAPHY
2014年
4期
537-547
,共11页
邱余波%伊海生%王果%张占峰%刘俊平%蒋宏%罗星刚%杜默%张磊
邱餘波%伊海生%王果%張佔峰%劉俊平%蔣宏%囉星剛%杜默%張磊
구여파%이해생%왕과%장점봉%류준평%장굉%라성강%두묵%장뢰
伊犁盆地南缘%洪海沟地区%西山窑组%砂岩型铀矿%沉积相
伊犛盆地南緣%洪海溝地區%西山窯組%砂巖型鈾礦%沉積相
이리분지남연%홍해구지구%서산요조%사암형유광%침적상
southern margin of Ili Basin%Honghaigou area%Xishanyao Formation%sandstone-type uranium deposit%sedimentary facies
研究伊犁盆地南缘洪海沟地区主力含铀层系---中侏罗统西山窑组上段的沉积特征,为该区下一步铀矿地质勘查提供理论依据。根据沉积结构、岩性组合、沉积韵律、沉积构造、测井曲线等特征,认为西山窑组上段在洪海沟地区主要发育曲流河沉积。根据连井剖面特征,以及砂体厚度、砂地比等沉积特征在平面上的变化,洪海沟地区西山窑组上段沉积相的平面分布规律明显,中间为沿北西-南东向展布的曲流河道,河道南部为河漫沼泽,北部为河漫滩。综合研究区岩性、构造、铀源等成矿条件,西山窑组上段赋存的铀矿体主要受河道砂体展布方向、河道砂体厚度、砂体粒度、砂体中的泥岩夹层、地层产状等因素控制。
研究伊犛盆地南緣洪海溝地區主力含鈾層繫---中侏囉統西山窯組上段的沉積特徵,為該區下一步鈾礦地質勘查提供理論依據。根據沉積結構、巖性組閤、沉積韻律、沉積構造、測井麯線等特徵,認為西山窯組上段在洪海溝地區主要髮育麯流河沉積。根據連井剖麵特徵,以及砂體厚度、砂地比等沉積特徵在平麵上的變化,洪海溝地區西山窯組上段沉積相的平麵分佈規律明顯,中間為沿北西-南東嚮展佈的麯流河道,河道南部為河漫沼澤,北部為河漫灘。綜閤研究區巖性、構造、鈾源等成礦條件,西山窯組上段賦存的鈾礦體主要受河道砂體展佈方嚮、河道砂體厚度、砂體粒度、砂體中的泥巖夾層、地層產狀等因素控製。
연구이리분지남연홍해구지구주력함유층계---중주라통서산요조상단적침적특정,위해구하일보유광지질감사제공이론의거。근거침적결구、암성조합、침적운률、침적구조、측정곡선등특정,인위서산요조상단재홍해구지구주요발육곡류하침적。근거련정부면특정,이급사체후도、사지비등침적특정재평면상적변화,홍해구지구서산요조상단침적상적평면분포규률명현,중간위연북서-남동향전포적곡류하도,하도남부위하만소택,북부위하만탄。종합연구구암성、구조、유원등성광조건,서산요조상단부존적유광체주요수하도사체전포방향、하도사체후도、사체립도、사체중적니암협층、지층산상등인소공제。
Studying sedimentary characteristics of the Upper Xishanyao Formation, which is the main uranium-bearing stratum in Honghaigou area of southern margin in Ili Basin,will provide important theory evidence for further uranium exploration in study area.Based on the characters of sedimentary tex-tures,lithologic associations, sedimentary rhythms, sedimentary structures, and logging curves, the Upper Xishanyao Formation can be considered as meandering channel facies in Honghaigou Area.Com-bined with the connected well's profiles,the lateral changes of sedimentary characteristics including the thickness of sand body,the ratio of sand to stratum,sedimentary facies of Middle Jurassic Upper Xishan-yao Formation was clear,which showed that there was meandering channel along northwest-southeast in the middle part,a flood swamp in the south and a floodplain in the north.By summarizing and analyzing the metallogenic conditions in study area,including lithology,tectonic setting,and uranium source,the uranium ore bodies occurred in the Upper Xishanyao Formation in Honghaigou area were mainly controlled by the distribution direction,thickness,grain size,the mudstone intercalations in sandbody,and the oc-currence of stratum.