南海西北海盆晚中新世以来浊积体地震相特征及海平面变化.pdfVIP

热带海洋学报 JOURNAL OF TROPICAL OCEANOGRAPHY 2012 年 第 31 卷 第 3 期: 113−119 海洋地质学 doi:10.3969/j.issn.1009-5470.2012.03.015 南海西北海盆晚中新世以来浊积体地震相特征及海平面变化 高红芳 , 510760 : 3 , , -, , , , , , , : ; ; ; ; 中图分类号: P736; P738 文献标识码: A 文章编号: 1009-5470(2012)03-0113-07 Seismic facies’ characteristic of turbidites and sea level change in the northwest sub-basin of South China Sea since late Miocene GAO Hong-fang Guangzhou Marine Geological Survey, Guangzhou 510760, China Abstract: Using the recent high-resolution seismic data of three years, the author analysed the seismic facies combination and inner feature of turbidites in detail and discussed the change of sea level combining turbidites’ characteristics evolution of different epochs and different layers since late Miocene in the northwest sub-basin of the South China Sea (SCS). The turbidites exhibit with channel-levee complex during late Miocene to Pliocene and with lobe facies that channel facies is not distinguished during Quaternary. It is the prominent trait of turbidity action in the northwest sub-basin of the SCS since late Miocene that channels incised continually and retreats from abyssal plain towards the slope. The channel evolving process displays an ascending trend as a whole of sea level since late Miocene. The turbidites seismic facies’ change in the inner sequence reveals the sea level went through respectively not less than two ascending-descending cycles during late Miocene and Pliocene and sea level is early ascending stage after descending quickly during Quaternary. The sea level’s changing tr