江西省丹霞地貌特征及其控制因素探讨
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本文为国家自然科学基金项目“赣粤闽地区丹霞地貌形成与演化过程中岩相控制作用研究”(编号41772197)和江西省技术创新引导类计划项目(编号20212AEI91008)联合资助的成果。


Characteristics and controlling factors of danxia landscapes in Jiangxi Province
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    摘要:

    江西省的丹霞地貌主要分布在30余个白垩纪红层盆地中,总共有228处,数量位居全国之首,以鹰潭市龙虎山世界地质公园的丹霞地貌最为典型和知名。根据形态特征,将江西省的丹霞地貌划分为山峰、陡崖、崩积体、峡谷、洞穴及其他微地貌等六大类。燕山构造旋回晚期(主要是白垩纪),在地壳伸展拉张的构造背景下,江西省形成了一系列北东走向的陆相断陷盆地,从盆地边缘到中心依次沉积红色冲洪积扇相砾岩、河湖相砂岩和泥岩,在信江盆地的中部还发育沙漠相风成砂岩。红层岩相是丹霞地貌演变的基本物质基础,对丹霞地貌的分布具有重要影响。在喜马拉雅构造旋回中,这些红层被构造抬升、切割,随后在风化、流水侵蚀及崩塌等外动力地质作用下形成了红色陡崖坡及一系列侵蚀地貌,即丹霞地貌。以龙虎山世界地质公园核心景区仙水岩为例,用面积高程积分方法对江西省丹霞地貌的演化阶段及其主控因素进行了分析。仙水岩景区地层出露一致,丹霞地貌整体处于老年早期的残丘阶段,地貌侵蚀程度较强;由于水系溯源侵蚀,景区内不同部位地貌的演化阶段、类型及面积高程积分值(HI值)不尽相同。本文对江西省丹霞地貌基本特征及控制因素的分析和总结研究将加深对各类丹霞地貌成因的理解,推动丹霞地貌国际化进程,也为其他湿润气候区丹霞地貌地质遗迹的合理利用提供参考。

    Abstract:

    In Jiangxi Province, danxia landscapes dominantly develop within thirty red terrestrial basins of the Cretaceous Period in eastern and southeastern areas. There are totally 228 danxia landscape sites in Jiangxi Province, the most of any provincial administrative region, with Longhushan UNESCO Global Geopark most typical and wellknown. Based on the morphological characteristics, they can be divided into six categories, namely peak, cliff, rockfall, canyon, cavity, and other microlandforms. A series of northeasttrending fault basins were generated under the tectonic setting of crustal extension during the late Yanshanian Orogenic Cycle (dominantly Cretaceous) in South China. Paleoenvironments changed from the margin to the center of the basin, resulting in variations of depositional systems and lithofacies from alluvial fan conglomerates to river and lacustrine sandstones and mudstones in sequence with eolian sandstones in the middle of the Xinjiang basin. Lithofacies of red beds were the foundation of landscape evolution and had an important influence on the spatial distribution of danxia landscapes. The red beds were tectonically uplift and dissected during the Himalaya Orogenic Cycle to form spectacular red cliffs and a range of erosional landforms, that is danxia landscape, by exogenic geological processes including weathering, water erosion and rock collapse. The evolution stage and controlling factors of danxia landscapes are analysed by hypsometry on the example of the core scenic area Xianshuiyan within the Longhushan UNESCO Global Geopark. The danxia landscape in the Xianshuiyan scenic area is early latestaged with residual hills and strongly eroded landforms. The stratigraphic outcrop and lithology of the Xianshuiyan area are consistent, thus the differences in the landscape evolution stages, landform types and hypsometric integral (HI) values between the geomorphic units in this area were caused by headward erosion of river systems. This review work on the spatial distribution and evolution of the danxia landscapes in Jiangxi Province is significant because it not only improves understanding of formation processes of various types of danxia landscapes and international comparison and communication, but it is also beneficial for reasonable utilization of the danxia landscape geoheritages in other humid areas.

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陈留勤,郭福生,邵崇建,楼法生,李斌,黎广荣,郄海满,吴知勇,姜勇彪,刘富军.2022.江西省丹霞地貌特征及其控制因素探讨[J].地质学报,96(11):4023-4037.
Chen Liuqin, Guo Fusheng, Shao Chongjian, Lou Fasheng, Li Bin, Li Guangrong, Qie Haiman, Wu Zhiyong, Jiang Yongbiao, Liu Fujun.2022. Characteristics and controlling factors of danxia landscapes in Jiangxi Province[J]. Acta Geologica Sinica,96(11):4023-4037.

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  • 收稿日期:2022-04-09
  • 最后修改日期:2022-05-14
  • 在线发布日期: 2022-12-21