期刊
SEDIMENTARY GEOLOGY
卷 192, 期 1-2, 页码 19-55出版社
ELSEVIER
DOI: 10.1016/j.sedgeo.2006.03.024
关键词
supersequence; mixed carbonate-siliciclastic sequence; lower Paleozoic; Taebaeksan Basin; North China Platform
类别
This study focuses on the sequence stratigraphic implications of the Taebaek Group (Cainbrian-Ordovician), a mixed carbonate-siliciclastic sequence (ca. 1200 m thick), in the mideastempart of the Korean peninsula. The group contains 11 lithologic units (formations) that can be partitioned into four packages (supersequences I-IV). Each package comprises alternation of siliciclastic and carbonate successions, corresponding to the second-order sequence (supersequence) formed in a period of 10-100 m.y. Supersequence I (Jangsan/Myeonsan, Myobong, and Daegi fms) represents the initial inundation and subsequent drowning during the late Early to middle Middle Cambrian. It experienced the drowning between the middle and late Middle Cambrian, forming type-3 sequence boundary. Supersequence H (Sesong and Hwajeol fms) was formed by prolonged marine flooding during the late Middle and Late Cambrian. It was terminated. by a large supply of siliciclastics due to the rejuvenation of the drainage basin, and the subsequent shallowing at the Cambrian-Ordovician boundary (type-2 sequence boundary). Supersequence III (Dongjeom, Dumugol, and Makgol fms) comprises the lowstand coarse-grained siliciclastics, transgressive shale by marine flooding, and shallow platform carbonates by highstand progradation in the Early Ordovician. Following the large-scale eustatic fall of sea level in the earliest Middle Ordovician, supersequence IV (Jigunsan and Dawibong fms) formed on the subaerial exposure surface (type-1 sequence boundary) by resumed marine flooding in the Middle Ordovician. This study provides basis for basin-scale correlation with the coeval sequences in northeastern China. (c) 2006 Elsevier B.V. All rights reserved.
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