Grain-size Characteristics of Quaternary Sediments in Zhangzhou City,Fujan Province and Their Environmental Implication
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摘要: 对福建省漳州市不同沉积相带(河道沉积相带和海湾沉积相带)的两个钻孔进行详细的第四纪沉积物激光粒度分析,综合研究区内代表性钻孔的岩性和岩相等资料,得出了研究区第四系沉积环境及其演化的认识。采用MS—2000型激光粒度分析仪进行测试,对测试数据进行整理和分析,绘制出频率曲线图、概率累积曲线图和粒度众数分布曲线图等,并进行沉积环境的解释。在粒度分析曲线解释意义上,提出激光粒度分析方法做出的粒度众数曲线能够较灵敏地反映沉积环境及其水动力条件的变化,可以作为环境分析的辅助手段。在环境解释方面,漳州盆地第四纪环境演化经历了:①晚更新世中期龙海组冲洪积;②晚更新世晚期东山组冲积;③全新世早、中期长乐组下部海积;④全新世晚期长乐组上部洪冲积的演变过程。Abstract: On the basis of the grain size data from the samp les of two bore holes in the Zhangzhou City, Fujian Province, and the stream channel facies belt and estuarine facies belt, the Quaternary sedimentary environment and its evolution are discussed in details. The grain size parameters of 91 sediment samples obtained from MS 22000 Laser Grain Size Analyzer have been illustrated in frequency curves, cumulative frequency curves on probability scale, and modal curves. For the imp lication of the grain size distribution, the results show that the segments of the modal curves are obvious and have concordance with the segment of the cumulative frequency curves on probability scale, so that modal curves have an important significance in explanation of hydrodynamic sorting. The four evolutional stages during the Quaternary in the Zhangzhou basin are recognized as follows: 1) the alluvial facies and pluvial facies of the Longhai Formation during the middle Late Pleistocene; 2) the alluvial facies of the Dongshan Formation during the late Late Pleistocene; 3) the bay milieu or estuarine facies of lower part of the Changle Formation in the early and middle Holocene in age; 4) the alluvial facies and pluvial facies of upper part of the Changle Formation in the late Holocene in age.
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Key words:
- grain size analysis /
- sedimentary environment /
- Quaternary /
- Zhangzhou City /
- Fujian Province
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