CAJ | 학술논문

　　对准噶尔盆地东北部Db1井中生界晚三叠世?中晚侏罗世三组砂岩样品,共计199颗锆石进行了显微结构和LA-ICP-MS U-Pb定年分析。根据锆石矿物特征,阴极发光图像和年龄分布特征,结合区域沉积古流体系的地质约束,对研究区晚三叠世?中晚侏罗世的沉积物源环境及其地质构造意义进行了讨论。结果表明：碎屑锆石主要物源可能包括准噶尔盆地内部、准北周缘造山带,碎屑锆石U-Pb年龄以较宽的时域分布在150～1224 Ma,并在统计分布上存在4个主要的538～360 Ma,354～271 Ma,267～208 Ma,185～150 Ma年龄区间及对应的510,490,410,330,290,250,162 Ma 7个峰值年龄。碎屑锆石出现162 Ma的峰值年龄,反映了燕山运动对准噶尔地区的影响。
　　대준갈이분지동북부Db1정중생계만삼첩세?중만주라세삼조사암양품,공계199과고석진행료현미결구화LA-ICP-MS U-Pb정년분석。근거고석광물특정,음겁발광도상화년령분포특정,결합구역침적고류체계적지질약속,대연구구만삼첩세?중만주라세적침적물원배경급기지질구조의의진행료토론。결과표명：쇄설고석주요물원가능포괄준갈이분지내부、준북주연조산대,쇄설고석U-Pb년령이교관적시역분포재150～1224 Ma,병재통계분포상존재4개주요적538～360 Ma,354～271 Ma,267～208 Ma,185～150 Ma년령구간급대응적510,490,410,330,290,250,162 Ma 7개봉치년령。쇄설고석출현162 Ma적봉치년령,반영료연산운동대준갈이지구적영향。
Three groups of sandstone samples in ages ranging from the Late Triassic to Mid-Late Jurassic were collected from the Dbl well in the northern Jungger Basin. The U-Pb ages of 237 single zircon grains contained in the sandstone samples were anslyzed by the LA-ICP-MS method. According to the mineralogical characteristics, zircon cathodoluminescence image and the age distribution characteristics, combined with the constraints of palaeocurrent, the sediment sources and geological significance were discussed. It is shown that the main source for detrital zircon in Junggar Basin might include an internal and quasi north peripheral orogenic belt. Detrital zircon U-Pb ages were in a wild range of 150～1 224 Ma, and four major age groups, i.e. 538～360 Ma, 354～271 Ma, 267～208 Ma, 185～150 Ma had existed, corresponding to seven major peak age at 510, 490, 410, 330, 290, 250, 162 Ma. Detrital zircons had a peak age 162 Ma, implying that the Yanshanian movement had affected the tectonic evolution in the northern Jungger Basin.