浙江晚中生代雁荡山地貌成因及其与火山构造协同性演化规律

浙江雁荡山是东南沿海一座典型的晚中生代破火山，以发育丰富的白垩纪流纹质火山岩地貌为特色，主要包括火山岩相剖面和火山岩地貌两种类型地质遗迹。本次通过详细的野外地质调查、岩石学研究及遥感图像分析，进一步将其中火山岩相剖面划分为溢流相、基底涌流相、火山碎屑流相、空落相剖面地质遗迹四小类；火山岩地貌分为叠嶂、锐峰和岩洞地貌地质遗迹三小类，并综合分析了其分布规律与成因演化过程。研究表明这些地质遗迹的分布和演化明显受到火山构造与火山岩相的控制。另外，研究区显著发育3级夷平面，反映其至少经历过3期隆升- 剥蚀事件，是太平洋板块、菲律宾海板块与欧亚大陆板块相互作用的动力学过程及印度板块碰撞远程效应的综合影响结果，同时其也是研究流纹质火山岩地貌成因与演化过程的理想基地。

Late Mesozoic geomorphic origin of Yandangshan and its synergistic evolution with volcanic structures in Zhejiang Province

The Yandangshan of Zhejiang Province is a typical Late Mesozoic caldera in coastal southeastern China. It characterized by the various rhyolitic volcanic rock landscapes, which mainly include two types of geoheritages: volcanic lithofacies sections and volcanic rock landforms. In this paper, we conducted detailed field geological survey and petrological studies, as well as remote- sensing image analyses. The volcanic lithofacies profile is further divided into four sub- types of geoheritages: effusive facies, base surging facies, pyroclastic flowing facies, and air- falling facies; the landscapes of volcanic rocks are further divided into three sub- types of geoheritages, which are tiered peaks, sharp peaks and rock caves, respectively. Additionally, the distribution and evolution process of the Yandangshan caldera are comprehensively analyzed in this paper, and they are obviously affected by the volcanic structures and volcanic lithofacies. We conclude that at least three ancient planation surfaces are developed in the studied area, implying that it has experienced at least three uplifting- erosion events. It is the result of the geodynamic process of the interaction between the Pacific Plate- Eurasian, Philippines Sea Plate- Eurasian and the far- field effects of the Indian- Eurasian collision. It is an attractive study based on the geomorphological origin and evolution of the rhyolite volcanic landscape.