| 扬子北缘黄陵地区晚中生代盆地演化及其构造意义 |
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| 引用本文： | 渠洪杰,康艳丽,崔建军.扬子北缘黄陵地区晚中生代盆地演化及其构造意义[J].地质科学,2014,49(4):1070-1092. |
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| 作者姓名： | 渠洪杰 康艳丽 崔建军 |
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| 作者单位： | 中国地质科学院地质力学研究所 北京 100081 |
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| 基金项目： | 国家自然科学青年基金项目，中国地质调查项目 |
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| 摘 要： | 扬子北缘黄陵地区古构造应力场于晚中生代经历发生了重大转变，是扬子板块与华北板块在三叠纪碰撞造山之后陆内构造变形的体现。由黄陵背斜周缘晚中生代盆地充填记录所反映出这一变革的起始时间为中侏罗世晚期。早侏罗世-中侏罗世早期，盆地内沉积了以桐竹园组为代表的河流-湖泊相岩层，由沉积碎屑成分和古水流统计所得出的物源区为北部的秦岭地区，黄陵背斜上部可能也接受了碎屑沉积；中侏罗世晚期-晚侏罗世，沉积中心发生了改变，表现为仅仅在黄陵背斜西侧的秭归盆地内有所保存，沉积环境以曲流河到辫状河流和三角洲为主，物源区则局限于黄陵背斜；早白垩世初期，周坪盆地和宜昌盆地为沉积中心，近缘冲积扇和辫状河流体系占据主体，物源区依然为黄陵地区，两盆地在黄陵背斜南缘可能相连，黄陵背斜上部的原下侏罗统被剥蚀；早白垩世晚期-晚白垩世，远安盆地逐渐发育，盆地西缘为冲积扇-辫状河流体系，中、 东部则以曲流河-湖泊沉积环境为主体，并间有干旱沙漠环境。原型盆地再造结果显示，早侏罗世-中侏罗世早期盆地展布具有近东西向特点，古地貌总体呈现出北部为山脉、 南部为盆地的格局；中侏罗世晚期以来，盆地呈近南北向，黄陵背斜逐渐形成山脉，盆地位于其东西两侧。两期盆地沉积特征反映了扬子北缘古构造应力场由近南北向转变为近东西向的过程。
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| 关 键 词： | 黄陵背斜 砾石成分 古水流 物源 中侏罗世晚期 |
Late Mesozoic sedimentary basin evolution and tectonic implication in Huangling area,northern of Yangtze block |
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| Qu Hongjie,Kang Yanli,Cui Jianjun.Late Mesozoic sedimentary basin evolution and tectonic implication in Huangling area,northern of Yangtze block[J].Chinese Journal of Geology,2014,49(4):1070-1092. |
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| Authors: | Qu Hongjie Kang Yanli Cui Jianjun |
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| Institution: | Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081 |
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| Abstract: | There was an important change on the paleo-stress field during Late Mesozoic in Huangling area, northern of Yangtze block, which is the record reflects the intercontinental tectonic deformation of collision orogeny by Yangtze block and North China block. It is known from the basin-filling records that the starting time of the changing is the Late Middle Jurassic. From Early Jurassic to Early Middle Jurassic, the fluvial and lacustrine strata as Tongzhuyuan Fm. deposited in the basin with the provenance of Qinling Mountain in north, which is known from the sedimentary clastic composition and the paleocurrent statistics and might preserved the clastic deposition on the top of the Huangling uplift. From Late Middle Jurassic to Late Jurassic, the sedimentary center changed and only preserved in Zigui Basin in the west of Huangling uplift, the mainly sedimentary environment is meandering river and the provenance is limited in Huangling uplift. In Early Cretaceous, the sedimentary center is Zhouping Basin and Yichang Basin with the mainly proximal alluvial fan system and the provenance Huangling region, which was connected in the southern margin of the basin and Lower Jurassic on the top of Huangling uplift was denuded. From Late Early Cretaceous to Late Cretaceous, Yuanan Basin gradually developed as the alluvial fan-braided river system in the west margin, the meandering river-lake sedimentary environment in the east and middle, and arid desert environment in the middle of the basin. It is shown from the result of the prototype basin reconstruction that the characteristic of basin distribution on Early Jurassic to Early Middle Jurassic is nearly to east-west with the overall palaeo-geomorphology as the mountains in the north and basin in the south. Since the Late Middle Jurassic, the basin was nearly to north-south, and the basins located in the east and west side of Huangling uplift. The prototype basin reconstruction results show that basins controlled by north-south paleo-stress field before the Early Middle Jurassic, and then transformed into nearly east-west. |
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| Keywords: | Huangling anticline Gravel composition Paleocurrent Provenance Late Middle-Jurassic |
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