| 福建连城冠豸山网格状丹霞地貌的空间展布特征和构造意义 |
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| 关键词:Longyan Global Geopark Cretaceous Danxia Guanzhaishan grid-like conjugate joints |
| 基金项目:本文由中国地质调查局地质调查项目“边疆地区世界级地质遗迹潜力区调查评价”(编号: DD20230100504)资助。 |
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| Spatial Distribution Pattern of the Danxia Landform in Guanzhaishan, Liancheng County, Fujian Province, and Its Structural Significance |
| In 2024, Longyan Geopark was successfully designated as a UNESCO Global Geopark. Within the park, the Danxia landform of Guanzhaishan is internationally renowned for its unique monoclinal Danxia structure. Guanzhaishan is within the Liancheng Basin, a distinctive NE–SW trending small continental basin formed in Fujian since the Late Mesozoic. This basin represents a sedimentary response to subduction of the Paleo-Pacific Plate. The famous monoclinal Danxia landscape of Guanzhaishan is developed in the eastern part of the basin. The primary landscape-forming stratum at Guanzhaishan is the Upper Cretaceous Chong’an Formation. This formation is widely exposed in the eastern basin, where it overlies the Shaxian Formation with a disconformable (locally conformable) contact. At the basin margins, it onlaps older strata. The top of the formation is not preserved. The Chong’an Formation comprises a thick succession of continental red beds, deposited in fluvial and alluvial fan environments, dominated by thick-bedded to massive coarse clastics. The rock assemblage consists of grayish-purple to purplish-red, thick-bedded to very thick-bedded polymictic conglomerates with high rock strength. Under the compressional stress of the Yanshan Orogeny, these purplish-red conglomerates developed grid-like conjugate joints following the principle of maximum effective moment. After the later Neotectonic uplift, fluvial erosion and weathering along these joints sculpted the unique grid-patterned Danxia landform. This process created the classic Danxia features such as cliff-top castles, stone walls, pillars, linear valleys, box canyons, and gorges. Guanzhaishan stands as a geological treasure of immense value in southeastern China, showcasing exceptional geological heritage. |
| LIU Gang,ZHENG Yuan,WANG Min,SUN Wenyan.2026.Spatial Distribution Pattern of the Danxia Landform in Guanzhaishan, Liancheng County, Fujian Province, and Its Structural Significance[J].Acta Geoscientica Sinica,47(2):399-408. |
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