SEDIMENTARY FILLING EVOLUTION OF CHENGDU BASIN IN LATE CENOZOIC
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摘要:
成都盆地为龙门山构造带与龙泉山褶断带之间的陆相沉积盆地, 盆内充填了巨厚的晚新生代半固结-松散沉积物. 通过盆地的沉积特征及充填过程分析, 认为在沉积过程中发生了两次沉积-构造转换及可容纳空间的改变, 并导致了沉积中心从龙门山逆冲推覆构造带前缘迁移至大邑-彭州断裂带下盘地区. 沉积特征显示以冲积扇和河流相为主. 其中上新世大邑砾岩期以冲积扇相为主, 仅分布于蒲江-新津-成都-德阳一线以西地区; 早-中更新世时期以冲积扇与河流相沉积为主, 蒲江-新津-成都-德阳一线以西地区为冲积扇分布区, 以东为河流相分布为主; 晚更新世-全新世以河流沉积为主, 但东、西两区域的沉积物来源和水系特征存在明显差异. 本研究可为成都市地下空间三维地质结构建模、地下空间资源潜力评价、矿产资源及人文资源的赋存层位等研究提供依据.
Abstract:Chengdu Basin, a continental sedimentary basin between Longmenshan tectonic belt and Longquanshan fold fault belt, is filled with huge thick Late Cenozoic semi-consolidated and loose sediments. Based on the analysis of sedimentary characteristics and filling process of the basin, it is considered that there are twice sedimentary-tectonic transformations and changes in accommodation space during the sedimentary process, which leads to the migration of sedimentary center from the front of Longmenshan thrust tectonic belt to the footwall area of Dayi-Pengzhou fault belt. The sedimentary characteristics show that the basin is mainly alluvial fan and fluvial facies. The Pliocene Dayi conglomerate stage is dominated by alluvial fan facies, distributed only on the west of Pujiang-Xinjin-Chengdu-Deyang line. During the Early-Middle Pleistocene, alluvial fan and fluvial facies deposits are predominant, with the west of Pujiang-Xinjin-Chengdu-Deyang line as the alluvial fan area and the east as the fluvial facies area. The Late Pleistocene-Holocene is mainly fluvial deposits, but the sediment sources and drainage characteristics between the east and west areas are obviously different. The study may provide a basis for 3D geological structure modeling of underground space, potential evaluation of underground space resources, as well as occurrence horizon of mineral and human resources in Chengdu City.
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Key words:
- Chengdu Basin /
- Late Cenozoic /
- sedimentary center /
- alluvial fan facies /
- fluvial facies /
- underground space
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