辽东湾湾口海域柱样沉积物的粒度变化及其影响因素  

VARIATION IN GRAIN-SIZE DISTRIBUTION PATTERN OF THE SOUTHEASTERN LIAODONG BAY AND ITS IMPACT FACTORS

作　　者：赵京涛[1,2] 胡邦琦[1,2] 李军[1] 白凤龙[1] 徐东浩[1,3] 李国刚[4] 张现荣[1] 

机构地区：[1]国土资源部海洋油气资源与环境地质重点实验室,青岛海洋地质研究所,青岛266071 [2]中国科学院边缘海地质重点实验室,中国科学院南海海洋研究所,广州510301 [3]吉林大学地球科学学院,长春130061 [4]国家海洋局北海海洋工程勘察研究院,青岛266033

出　　处：《海洋地质与第四纪地质》2013年第6期19-27,共9页Marine Geology & Quaternary Geology

基　　金：辽东湾近海海砂及相关资源潜力调查(1212011088110);国家自然科学基金项目(41206049);中国科学院边缘海地质重点实验室开放基金项目(MSGL12-1);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(MRE201231)

摘　　要：通过对辽东湾湾口海域两根柱样沉积物（LDC30和LDC25孔）的岩性和粒度参数特征分析，并结合前人研究结果，对该海域早全新世以来的沉积环境和物源演变过程进行了探讨。结果表明，两孔的岩性和粒度特征均可划分为上下两层，上层沉积物的砂含量和平均粒径均明显大于下部。两孔下层沉积物为该海域全新世海侵开始至约高海平面（～7kaBP），海平面逐渐升高过程中的滨岸浅海沉积，而上层沉积物为全新世最大海平面以来的潮流沉积产物。同时，LDC30和LDC25孔的物质来源在上下两层不一，主要受控于海平面变化导致的沉积环境演变和气候变化控制的河流沉积物输入。Based on the lithology and grain-size parameters of the two piston cores（LDC30 and LDC25） ,we studied the changes in sedimentary environment and provenance of the southeastern Liaodong Bay since early Holocene. The lithology and grain-size parameters of the two cores display two step variations, and the sand content and mean grain-size of the upper layers are obviously larger than that in the lower parts. It suggests that the lower section of the sediments is mainly deposited under a nearshore shallow marine environment during the early Holocene transgression,whereas the upper section deposited in the tidal envi- ronment since the highest sea level stand （〈7 kaBP）. The sediment provenance of these two sections in the piston cores is also different with each other,under the control of sedimentary environment changes caused by sea level fluctuation and the terrigenous input variation related to the East Asian summer monsoon.

关 键 词：沉积物粒度 潮流沉积 海平面变化 辽东湾 

分 类 号：P736.21[天文地球—海洋地质]