CAJ | 학술논문

通过对库车坳陷北部野外露头侏罗系－新近系多套砾岩中砾石成分、砾石扁度、球度、砾径及沉积相类型等的分析，半定量评价了南天山山前砾石的沉积搬运距离。研究认为，侏罗系－新近系砾石搬运距离表现为由远及近的规律。剖面点处下侏罗统阿合组－阳霞组砾石搬运距离最远，计算出其搬运距离可达110～130 km；上侏罗统喀拉扎组砾石的搬运距离约为40 km；下白垩统亚格列木组－巴什基奇克组砾石搬运距离较近，约为20～45 km。古近系砾石沉积搬运距离约为20～50 km，新近系吉迪克组砾石的搬运距离最短，在20 km左右。结合前人磷灰石裂变径迹测年数据及研究成果，认为中、新生代天山存在晚三叠世—早侏罗世、晚侏罗世—早白垩世、晚白垩世—始新世及中新世以来4个隆升阶段，隆升范围两小两大。由砾石成分、砾态特征、砾径及砾石搬运距离反映的沉积物源区迁移等变化规律表明，砾岩沉积演化对天山4个阶段隆升的构造运动强烈程度具明显的响应。
통과대고차요함북부야외로두주라계－신근계다투력암중력석성분、력석편도、구도、력경급침적상류형등적분석，반정량평개료남천산산전력석적침적반운거리。연구인위，주라계－신근계력석반운거리표현위유원급근적규률。부면점처하주라통아합조－양하조력석반운거리최원，계산출기반운거리가체110～130 km；상주라통객랍찰조력석적반운거리약위40 km；하백성통아격렬목조－파십기기극조력석반운거리교근，약위20～45 km。고근계력석침적반운거리약위20～50 km，신근계길적극조력석적반운거리최단，재20 km좌우。결합전인린회석렬변경적측년수거급연구성과，인위중、신생대천산존재만삼첩세—조주라세、만주라세—조백성세、만백성세—시신세급중신세이래4개륭승계단，륭승범위량소량대。유력석성분、력태특정、력경급력석반운거리반영적침적물원구천이등변화규률표명，력암침적연화대천산4개계단륭승적구조운동강렬정도구명현적향응。
Samples from multiple sets of the Jurassic-Neogene conglomerate outcrops in Kuqa depression were collected and analyzed for the composition,flatness,sphericity,and size of gravel,and the sedimentary facies that had made everything happened,and for a semi-quantitative study of transportation distance of gravel in front of southern Tianshan Mountain.The results show a far-to-near pattern of gravel transport distance for the Jurassic-Neogene conglomerate.Gravels in the Lower Jurassic Ahe-Yangxia Formations migrated the farthest to 110-130 km,and those from the Neogene Jidike Formation moved the shortest at only 20 km.Between them,the gravels of the Upper Jurassic Kelaza Formation moved about 40 km,that of the Lower Cretaceous Yageliebu-Bashijiqike Formations ran at a distance range between 20 and 45 km and that in the Palaeo-gene conglomerate transported from 20 to 50 km.Combined with the previous apatite fission track data,the new results indi-cate that the uplift of the Tianshan Mountains can be divided into 4 stages( two of them were major unplifting and two of them were minor ones):the Triassic-Early Jurassic,Late Jurassic-Early Cretaceous,Late Cretaceous-Eocene,and Miocene-present.The composition,shape and size of the gravels as well as migration of provenance reflected by the gravel transport distance show that the sedimentary evolution of the conglomerate responded strongly to the 4 stages of uplifting process.