摘要
沂蒙山世界地质公园是岱崮地貌的命名地。作为一种新地貌类型,其成因、形成年代及演化等方面尚存在争议。基于此,本次研究通过野外崮体特征调查,总结了岱崮地貌的特征,对地层及河谷横剖面实测和光释光(OSL)测年,估算岱崮地貌开始形成的年代。研究结果表明,岱崮地貌特征与地层岩性相关。顶部寒武系张夏组厚层石灰岩,因抗风化和侵蚀能力较强,且发育垂直节理而形成“顶平”“身陡”的崮顶;下部岩性以泥岩、粉砂岩夹薄层灰岩为主,因抗风化能力较弱而形成坡缓的山麓,二者共同构成“方山”特征。利用不同时期河流阶地的年龄,计算河流侵蚀下切速率,并以此估算岱崮地貌开始形成的时间约为1.77 Ma。岱崮地貌的演化过程可划分为4个主要阶段:(1)寒武纪时期的物质基础形成阶段;(2)受构造运动抬升,地层逐渐出露地表,岱崮地貌进入地貌塑形阶段;(3)受流水、风力和重力崩塌作用影响,岱崮地貌进入发育成熟阶段;(4)最后岱崮地貌顶部灰岩坍塌而进入消亡阶段。本研究有助于加深对岱崮地貌的全面认识及其科学价值的挖掘,也有助于世界地质公园地质科学知识的普及。
The Yimengshan UNESCO Global Geopark(UGGp)is the origin of the“Daigu Landform”.Through field investigation of the characteristics of Gu landform,based on the measurement of river valley stratigraphy and profiles,and using the OSL dating of the river terrace to calculate the cutting rate,the formation time of Daigu Landform has been determined.The results show that the geomorphological features of the Daigu Landform are related to the strata lithology of the Gu body.Daigu Landform is a type of mesa structure,with a flat top,steep margin and gentle slope.Gu body is mainly composed of two strata with different lithologies:The top comprises Cambrian limestone with strong weathering resistance but develops many joints,while the Gu body with weak erosion resistance is dominated by mudstone and siltstone.We estimated that the formation time is about 1.77 Ma by using the erosion rate,based on the dating results of the river terrace.The Daigu Landform formation and evolution can be divided into four main stages:(1)the material was formed in the Early Cambrian;(2)tectonic uplift,and the strata gradually exhumed and the shaping stage began;(3)long-term weathering and denudation of various external forces,such as surface water that gradually created the mature Daigu Landform;(4)the landform ended its development when the upper limestone collapsed.The systematic study of the Daigu Landform has great importance in understanding the Daigu Landform and its scientific value,which also contributes to the spreading of geoscience knowledge of UGGps.
作者
蔡胤璐
武法东
韩晋芳
黄震
周莹
刘宝印
谌杨杨
CAI Yinlu;WU Fadong;HAN Jinfang;HUANG Zhen;ZHOU Ying;LIU Baoyin;CHEN Yangyang(College of Applied Science and Technology,Beijing Union University,Beijing 100101,China;School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China;China Tourism Academy,Beijing 100005,China;Country Garden Service Co.,LTD,Foshan,Guangdong 528300,China;Beijing Huaqingyuan Technology Group Co.,LTD,Beijing 100048,China;Administration for Yimengshan UNESCO Global Geopark,Linyi,Shandong 273300,China;Planning and Natural Resources Bureau of Mengyin County,Linyi,Shandong 276000,China)
出处
《现代地质》
CAS
CSCD
北大核心
2023年第4期1065-1074,共10页
Geoscience
关键词
岱崮地貌
地貌特征
河流阶地
沂蒙山世界地质公园
Daigu Landform
characteristic
river terrace
Yimengshan UNESCO Global Geopark
作者简介
蔡胤璐,女,博士,讲师,1988年出生,第四纪地质学专业,主要从事地质遗迹评价与规划、旅游地学研究。Email:309697233@qq.com;通信作者:武法东,男,教授,博士生导师,1953年出生,第四纪地质学专业,主要从事第四纪地质学、沉积学、地质遗迹保护及地质公园建设方面的教学与研究。Email:wufd@cugb.edu.cn。
