琼州海峡西段第四纪沉积相与环境  

QUATERNARY SEDIMENTARY FACIES AND ENVIRONMENT OF WESTERN Q10N6ZHOU STRAIT

作　　者：冯伟文[1] 范时清[2] 

机构地区：[1]中国科学院南海海洋研究所 [2]中国科学院南海海洋研究所

出　　处：《热带海洋》1990年第2期39-39,共1页

摘　　要：对琼州海峡西段表层和柱状采样的沉积物,进行了~(14)C放射性年代、氨基酸年代估计及微体化石、矿物与地球化学分析。初步划分了柱状沉积物层序、确定了所研究的沉积物的年代和沉积类型。研究结果表明,本区在早更新世早期为浅海环境,气候温暖,形成了富含微体化石的浅海相地层;随后本区东部隆升为陆,而西部及北部湾部分区域,随着气候波动、海平面相对升降则交替出现了滨海相与陆相环境。全新世期间,该区形成了浅海海峡环境。The study area is located in 109°40' - 110°20' E , 20°-20°20' N which is the western Qiongzhou Strait, east of Beibu Gulf in the northwestern South China Sea. The inlerpretalional study for surfacial and piston coring sediment Samples obtained by R/V Shiyan Ⅱ in September 1985, from this area is based on methods of carbon-14 dating, fossil amino-acid geoperiodical estimating, microfossil assemblages, mineralogy and geochemistry.This study shows that there are five types of sarfacial sedimentary deposits in the area and three chronoliths in the Holocene Core HS-20 (196cm in length, 16m in water depth): 1. open shallow sea deposit; 2. beach deposit; 3. deposit of land weathering remains; 4. shallow sea-type strait current deposit; 5. Holocene beachy clay-bearing silt deposit, which includes three chronoliths of climatic sub-periods since 4800±50 years B.P.

关 键 词：第四纪 沉积相 环境 

分 类 号：P534.63[天文地球—第四纪地质学]