福建省泉州市第四纪沉积物粒度特征及沉积环境分析

Grain-Size Characteristics of Quaternary Sediments and Its Sedimentary Environment Implication in Quanzhou City, Fujan Province

中文关键词:  粒度分析,沉积环境,第四纪,泉州,福建

英文关键词:Grain size analysis,Sedimentary environment,Quaternary,Quanzhou City,Fujian Province

中文摘要:

      对福建省泉州市钻孔,进行详细的第四纪沉积物粒度分析,同时结合地质背景、岩性等资料,得出了研究区第四纪以来沉积环境及其演变的认识。采用MS-2000型激光粒度分析仪进行测试,所测数据利用计算机整理,绘制出沉积物粒度频率曲线、概率累积曲线和粒度众数分布曲线图。根据曲线变化情况,进行沉积环境及其演变解释。区内第四纪沉积环境和沉积物的成因类型分为3个类型,晋江河道以冲积相为主,山前高地以洪冲积为主,盆地主体区域以海湾相为主。第四纪以来泉州盆地环境演化经历了:更新统中期龙海组洪积和洪冲积→更新统晚期东山组洪积和洪冲积→全新统长乐组海湾相沉积。

英文摘要:

      On the basis of the grain size data from sediments of bore cores,geology background and lithology in the Quanzhou City, Fujian Province, the Quaternary sedimentary environment and its evolutional stages are treated in detail. The grain size parameter of 39 sediment samples obtained from MS-2000 Laser Grain Size Analyzer has been illustrated in the frequency curves, cumulative frequency curves on probability scale, and modal curves. For the implication of the grain size distribution, the results show that the segments of the modal curves are obvious and have concordance with the segments of the cumulative frequency curves on probability scale, so that modal curves have an important significance in explanation of hydrodynamic sorting.The three types of formation causes be reflected in Quanzhou basin: the alluvial facies in Jinjiang riverway, and the pluvial facies and alluvial facies in highland, and the bay milieu facies in basin. The three evolutional stages during the Quaternary of Quanzhou basin are recognized in the following: 1) the alluvial facies and pluvial facies of the Longhai Formation during the middle Pleistocene; 2) the alluvial facies and pluvial-alluvial facies of the Dongshan Formation during the late Pleistocene; 3) the bay milieu facies of the Changle Formation in the Holocene age.