地质学报2012，Vol.86Issue(3)：514-521,8.DOI:11-1951/P.20120307.1327.007
山东鲁山混合岩表面发现第四纪冰川剥蚀的直接证据——颤痕
A Direct Erosion Evidence of Quaternary Glaciation-Chatter Marks Found in Mt.Lushan, Shandong Province, East of China
摘要
Abstract
This paper reports the discovery of chatter marks on the glaciated bedrock in Mt. Lushan, Shandong Province, east of China. Chatter marks are series of small, curved fractures found on glaciated bedrock surfaces, formed by moving rock fragments frozen at the base of glacial ice. A single chatter mark is perpendicular to the moving direction of the overlying ice, and the arcuate fracture is convex downward. The fracture extends deeply into the bedrock at the center of a chatter mark, and becomes shallower gradually toward the two ends. The authors of this paper analyzed the mechanism of chatter marks. We believe that chatter marks are a series of en echelon R-shear fractures on the bedrock surface. Chatter marks are not only the direct evidences of ice moving over the bedrock, and can show the moving direction of the former disappeared glacier. Apart from chatter marks found in Mt. Lushan, there are other related landform evidences, such as, giant erratics, lateral moraines, potholes and scour grooves or troughs, showing the existence of Quaternary glaciation in the east of China. The controversy on the Quaternary glaciation in the east of China has lasted for more than 80 years, and the discovery of chatter marks in Mt. Lushan provides a direct evidence for the existence of Quaternary glaciation in the east of China.关键词
山东鲁山/混合岩/第四纪/冰川剥蚀/颤痕Key words
Mt. Lushan, Shandong Province/ migmatite/ Quaternary/ glacial erosion/ chatter marks引用本文复制引用
吕洪波,徐兴永,易亮,李萍..山东鲁山混合岩表面发现第四纪冰川剥蚀的直接证据——颤痕[J].地质学报,2012,86(3):514-521,8.基金项目
本文为山东省自然科学基金资助课题“中国东部第四纪冰川地貌研究”(编号Y2008E20)资助的成果. （编号Y2008E20）
