Glacigenic Characteristics of the Luoquan Formation and Sediment Gravity Flow Reworking on It
Glacigenic Characteristics of the Luoquan Formation and Sediment Gravity Flow Reworking on It作者机构：China University of Geosciences Wuhan Hubei China
出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报(英文版))
年 卷 期：1988年第1卷第3期
页 面：325-339页
学科分类：0709[理学-地质学] 0819[工学-矿业工程] 07[理学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0816[工学-测绘科学与技术]
主 题：Glacigenic Characteristics of the Luoquan Formation and Sediment Gravity Flow Reworking on It
摘 要：The origin of the Luoquan Formation which occurs along the southern margin of the North China Blockhas long been argued. Based on recent work. the Formation is considered as a glacial sedimentary sequencepartially reworked by sediment gravity flow. The major evidence for the glacigene of Luoquan Formationdiamictites is as follows: 1, a striated and polished pavement with various features resulting from glacialabrasion and plucking, such as crescentic gouge, crescentic fracture, streamlined form and glaciated step; *** diamictites with striated clast. faceted clast and iron-shaped stone formed by glaciation; 3. rhythmitewith dropstones; 4. a glacial sedimentary sequence bearing advance-retreat cycles; and 5. wide distribution ofthe diamictites. Glacial deposits can be distinguished from sediment gravity flow deposits by the features men-tioned above. Some characteristics of sediment gravity flow existing in the Luoquan Formation diamictites in-dicate that glacial deposits might have been partially reworked by sediment gravity flow. Therefore, this papersuggests that the Luoquan Formation diamictite is a result of a glacial event rather than a mud flow *** primary tillites are the principal contribution of the Luoquan Formation, while sediment gravity flow de-posits are the redeposited diamictites and should be termed as glacigenic sediment gravity flow deposits.
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