渐新世“雪球事件”的发现及其意义——基于全球冰斗系统的解读与研究  

Discovery and Significance of the Oligocene“Snowball Earth”Events——Interpretation and Research Based on Global Cirques System

作　　者：王照波[1,2,3] 王江月 WANG Zhaobo;WANG Jiangyue(Key Laboratory of Gold Mineralization Processes and Resources Utilization Subordinated to the Minis try of Land and Resources,Shandong Jinan 250013,China;Shandong Zhinanzhen Mineral Exploration Limited Corporation,Shandong Linyi 276006,China;Yimengshan National Geological Park Manage ment Office,Shandong Linyi 273304,China;Geography and Travel College of Qufu Normal University,Shandong Qufu 276800,China)

机构地区：[1]国土资源部金矿成矿过程与资源利用重点实验室,山东济南250013 [2]山东指南针矿产勘查有限公司,山东临沂276006 [3]沂蒙山国家地质公园管理局,山东临沂273304 [4]曲阜师范大学地理与旅游学院,山东日照276800

出　　处：《山东国土资源》2018年第9期1-8,共8页Shandong Land and Resources

基　　金：国土资源部金矿成矿过程与资源利用重点实验室开放课题(201403);山东指南针矿产勘查有限公司(ZNZ20180101)的联合资助

摘　　要：冰斗系统是冰斗作用以山体为载体进行剥蚀作用形成的结果,其在山体上形成的以缩口、三角脊、残弧等为代表的冰斗遗迹很难被后期的风化作用所消解,因此冰斗系统在解读古冰川作用中具有极为重要的意义。在对全球冰斗系统进行研究的过程中,发现了雪球事件,根据深海沉积物研究获得的环境变化信息,初步确定最近的一次雪球事件发生在渐新世,也即33.7~23.8Ma之间。研究发现雪球事件发生时,全球仅在赤道附近形成了4处陆生生物避难区,分别为刚果盆地、亚马逊盆地、阿拉弗拉海以及新加坡东部海域。研究认为,渐新世雪球事件塑造的冰斗地貌,是全球现代山区地貌的本底与基础。Cirques system is the result of denudation which takes mountain as a carrier by cirques action. The cirques relics it formed such as Cirques system Entrance, Triangular Ridge and Around Eluvium are hard to be eliminated by subsequent weathering. Therefore, the cirques system is of important significance in interpreting the ancient glaciation. Based on the research of the global cirques system, ＂Snowball Earth＂ events have been found. Based on the environmental change information obtained from deep sea sediment study. It is preliminarily determined that the latest snowball event occurred in the Oligocene, that is 33.7 -23.8Ma. It is found that during the ＂Snowball Earth＂ events , only four terrestrial biological refuge areas have been formed around the equator, including the Congo basin, the Amazon basin, the Arafura Sea and the southeast seas of Singapore. According to the study, the cirques landform formed by the ＂Snowball Earth＂ events in the Oligocene is the basic form of the modern mountain landscape in the world.

关 键 词：冰斗系统 冰斗地貌 陆生生物避难区 雪球事件 渐新世 

分 类 号：P343.6[天文地球—水文科学]