Morphology of Molar-Tooth Structures in Neoproterozoic and Its Indication Significance for the Depositional Environment of Jinshitan Area in Dalian, Eastern Liaoning Province

• 责任者：Peng Nan (Key Laboratory of Exploration Technologies for Oil and Gas Resources ; Ministry of Education ; School of Geophysics and Oil Resources ; Yangtze University ; Jingzhou 434023 ; China) ; Kuang Hongfei
• 刊名：Acta Petrologica et Mineralogica
• 出版年：2010
• 卷期：29(2)
• 关键词：碳酸盐岩 ; carbonate rocks ; 辽宁 ; Liaoning Province
• 页码：p.189-198
• 图表：6 illus., 1 table, 42 refs.
• 分类号：0802
• issnNo：ISSN1000-6524
• isbnNo：CN11-1966/P

Exemplified by “molar tooth” (MT) from Neoproterozoic Xingmincun Formation of Jinshitan in Dalian, this paper studied its morphological characteristics and analyzed its indication significance for sedimentary environment. A series of MT with complicated morphologies are developed in limestone of Upper Xingmingcun Formation. On the basis of a detailed observation, molar teeth are divided into ribbon, short-straight bar, worm, filamentous, dotted and detritus forms, with the ribbon form being dominant. Some sedimentary rhythms composed of silt-carbonates, micrite-carbonates, laminated carbonates and mud-carbonates were identified. Molar teeth were formed in the lower part of shallow subtidal-intertidal microfacies. It is thus concluded that different sets of morphology represent different lithofacies or rhythmic units, showing the indication significance for the morphology of MT.