| 晚更新世以来台湾浅滩西部地层结构与古环境演化 |
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| 引用本文： | 王利波,李军,陈正新,赵京涛,白凤龙,胡邦琦,窦衍光,翟滨.晚更新世以来台湾浅滩西部地层结构与古环境演化[J].沉积学报,2014,32(6):1089-1099. |
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| 作者姓名： | 王利波 李军 陈正新 赵京涛 白凤龙 胡邦琦 窦衍光 翟滨 |
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| 作者单位： | 1.中国海洋大学海洋地球科学学院 山东青岛 266100; |
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| 基金项目： | 国家自然科学基金(批准号:41406074,40746036,41376079,41206049);国土资源部海洋油气资源与环境地质重点实验室开放基金(编号:MRE201234)资助 |
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| 摘 要： | 根据对台湾浅滩西部地质浅钻的沉积相、粒度和AMS 14C年代分析及高分辨率浅地层剖面解释,本文研究了浅滩大型沙波区的地层结构与沉积环境演化.台湾浅滩西部保存了三期海相层和两期陆相层.下部的海相层(DU6)可能形成于氧同位素5.1期,以潮间带—潮下带浅海沉积为主;中间的海相层(DU4)可能形成于氧同位素3期,以滨岸—潮间带沉积为主;上部的海相层(DU2和DU1)为形成于末次冰消期以来的海侵砂和潮流砂.两期陆相层(DU5和DU3)为沟谷充填沉积,可能形成于氧同位素4和2期.冰后期海侵过程形成的中粗砂层构成了沙波的基底部分(DU2).沙波的主体部分(DU1)形成于全新世高海平面以来,主要由中粗砂和含砾中粗砂组成.沙波的粒度频率分布曲线主要众数组分-1~3 Φ,形态尖陡;概率累积曲线多为两段式,跃移组分含量高于80%,悬移组分不足20%,滚动组分缺失或很少.潮流砂(DU1)的平均粒径与分选系数呈良好的正相关,反映潮流的淘洗作用越强,沉积物粒径越粗、分选越好.
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| 关 键 词： | 台湾浅滩 潮流沉积 沉积环境 晚更新世 |
| 收稿时间： | 2013-08-20 |
Late Pleistocene and Holocene Stratigraphy and Paleo- environmental Evolution in the Western Taiwan Shoal |
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| Institution: | 1.College of Marine Geosciences, Ocean University of China, Qingdao, Shandong 266100;2.Key Laboratory of Marine Hydrocarbon Resources and Environment Geology, Ministry of Land and Resources, Qingdao, Shandong 266071;3.Qingdao Institute of Marine Geology, Qingdao, Shandong 266071 |
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| Abstract: | Sediment core and high-resolution subbottom profiles from the western Taiwan Shoal were analyzed to research stratigraphic sequence, paleo-environmental development of the Shoal. According to the analyses of sedimentary characteristics, grain-sizes and AMS 14C dating, three marine strata and two terrestrial strata were recovered in the core, which were confidently correlated with seismic units in the profiles. The bottom marine strata (DU6) were mainly composed of intertidal and subtidal deposits and were formed in the Marine Isotope Stage (MIS) 5.1; the middle marine strata (DU4) mainly consisted of littoral and intertidal deposits and were formed in the MIS 3; the top marine strata (DU2 and DU1) were transgressive sands and tidal sands in the last deglaciation, respectively. The two terrestrial strata (DU5 and DU3) were incised valley filling deposits, and were formed in the MIS 4 and MIS 2, respectively. Transgressive medium - coarse sands (DU2) constructed the base of sand waves. The main body of sand waves (DU1), which had been formed since the high sea-level stage in Holocene, mainly consisted of medium - coarse sands and gravelly medium - coarse sands, with stable grain-size and good sorting on the top. Grain-size frequency distribution curves of sand waves have a modal number of -1 to 3 Φ; probability cumulative curves are two-segment pattern generally, with leap composition more than 80% and suspension composition less than 20%.Correlative analysis shows that there is a positive correlative between mean grain-size and sorting coefficient of tidal sand deposits (DU1), indicating that the stronger tidal current scouring the coarser grain-size and the better sorting is the sandy deposits. |
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