红土·黄土·全球变化  

RED SOIL, LOESS AND GLOBAL CHANGE

作　　者：朱照宇[1] 王俊达[1] 黄宝林[1] 余素华[1] 向明菊[1] 张国梅 梁俊平[1] 江伟华 梁池生 王庆广 谢光国 孟玲 

机构地区：[1]中国科学院广州地球化学研究所,广东省地质矿产局水文工程地质一大队,中国科学院生态环境研究中心

出　　处：《第四纪研究》1995年第3期267-277,共11页Quaternary Sciences

基　　金：国家自然科学基金;北京中关村联合分析测试中心测试基金

摘　　要：华南热带区红土的分期及其时间序列和红土中的古环境记录及其与全球变化的关联是华南第四纪研究中的两大重要问题。本文重点讨论了多旋回的红土－沉积系列和红土－火山岩系列的时代及其环境记录所反映的华南气候、构造环境变迁的多旋回性，并指出红土系列也是全球变化的良好信息载体之一，华南环境变迁的多旋回性与黄土－古土壤系列、冰碛系列以及河－湖相系列所记录的全球变化的多旋回性振荡有某种程度的相似性。准周期为０．８Ｍａ、０．４Ｍａ、０．１－０．０８Ｍａ和０．０４－０．０２Ｍａ的环境变化在不同地区、不同时段有不同的反映。Red soil areas in the tropical and subtropical zones of South China play a veryimportant role in Quaternary environmental research of China because some sectionsconsisting of volcanic rocks, sediments and red soils remain almost intact.In this article, we suggest a concept of 'red soil sequence', which can be defined as a general continuous profile which has its time-scale and is built by a certain alternation of red soils and other materials including sediments or volcanic rocks.There are two main types of red soil sequences to be identified in the Leizhou Peninsula: red soil-sediment sequence and the red soil-volcanic rock sequence.The red soil-sediment sequence consists of seven main cycles, of which four cycles fall in the Zhanjiang Formation (Q1), two cycles in the Beihai Formation (Q,)and one cycle in the Basuo Formation (Q2). In the Zhanjiang Formation, the upper part of each cycle consists of variegated clay (weathered red clay) and the lower part of silt, sand and gravels. All the Zhanjiang Formation can be dividedinto 23-25 secondary sedimentary cycles. In the two cycles of the Beihai Formationeach consist of silt-sand-gravel layers and the middle contains a lot of tektites withan age of about 0.70 Ma.B.P. The Basuo Formation consists mainly of sand sediments.Prom the sedimentary rate, it is estimated that the possible ages of the bottoms ofthe seven main cycles are 0.03-0. 127, 0.452, 0.859, 1.274, 1.605, 2.001 and 2.440 MaB. P. and that the lasting time of each cycle is about 0.4Ma.The red soil-volcanic rock sequence contains volcanic rocks of several stagessuch as the Shimaoling volcanic stage, the Huguangyan volcanic stage and the LatePleistocene volcanic stage. This sequence recorded nine to twelve cycles since EarlyPleistocene.The study of red soil and paleoenronment was carried out on the basis of analyses of geochemistry, palynology, paleomagnetism, clay minerals and organic geochemistry. The red soil is higher in Al,Ga and Fe and lower in Si,Mg and S thanother in sequences. It contains a lot of

关 键 词：红土 黄土 古土壤 全球变化 第四纪 

分 类 号：P534.63[天文地球—第四纪地质学] P531[天文地球—古生物学与地层学]