摘要
本文主要对广东佛山西樵和邻近的粤东北的临江地层剖面MIS5a网纹红土的主量元素含量进行了研究。结果表明,这两个剖面MIS5a红土的SiO2、Al2O3、TOFE(Fe2O3+FeO)含量、硅铝率n(SiO2)/n(Al2O3)和化学蚀变指数CIA值与我国中亚热带和南亚热带红土都有明显的差异,而与热带地区——海南岛和雷州半岛红土中相应的地球化学指标比较接近。此前,在研究区碧寿洞和罗沙岩洞穴发现的MIS5a大熊猫—剑齿象动物化石群中,都含有热带动物成员——长臂猿(Hylobates sp.)、犀(Rhinoceros sp.)、中国犀(Rhinoceros sinensis)、华南巨獏(Megatapirus cf.angustus)和亚洲象(Elephas sp.)。据此提出,西樵山和邻近地区MIS5a网纹红土代表了热带气候环境;MIS5a期间南岭以南广东境内的生物气候带属于边缘热带范围。
Objectives:Numerous researches in lakes and ice cores of the Qinghai—Tibet Plateau,Chinese loess and cave records show that the Asian monsoon variety since MIS5 recorded the strong orbital-driven evidence,and that MIS1~5 and even MIS5a—e are the most basic characteristic periods during the D/O cycle processes.The vast redearth of southern China is an important area influenced by the Asian monsoon,especially the East Asian monsoon.However,there has been little research,so far,on how it responded to the characteristic periods since MIS5.We study the'Xiqiao section'and the stratigraphic investigation in the vicinity of the Xiqiaoshan area in South China to reconstruct the climate and environmental changes in southern China during MIS5.Methods:We analysed the contents of the main chemical oxides SiO2,Al2O3 and TOFE(Fe2O3+FeO)in sections,and discussed the distribution of main elements SiO2,Al2O3,TOFE(Fe2O3+Fe O).Also,we calculated the n(SiO2)/n(Al2O3)ratio(mole ratio)and alteration index CIA.Results:The results show that the contents of SiO2,Al2O3,TOFE,ratios of n(SiO2)/n(Al2O3),and alteration index(CIA)values in the red clay of MIS5a in both sections are significantly different from those of the mid-subtropical and southern subtropical regions of China,but quite similar with those of the tropics areas of Hainan Island and Leizhou Peninsula,especially,much close to those in Leizhou Peninsula.Moreover,tropics animals of Giant panda—saber—toothed elephant fauna of MIS5a,Hylobates sp.Rhinoceros sinensis,Megatapirus cf.angustus and Elephas ap.were discovered in Bishou Cave in the study area,to the west of the study area nearly150 km from Xiqiao Mountain,tropics memebers of Giant panda—saber—toothed elephant fauna of MIS5a,Megatapirus cf.angustus,Rhinoceros sp.and Rhinoceros sinensis were also found in Luoshayan Cave.Therefore,it is suggested that the red clay of MIS5a in Xiqiao Mountain and nearby areas indicates the tropical climate in MIS5a andthe bioclimatic zone during MIS5a in Guangdong south to Nanling Mountain probably belongs to the edge of tropical climate.Conclusions:The result of this study has proved regional response to the global climate change at low latitudes in China during that period,and provided particular evidence to support the orbital driving force theory of climate evolution in geochemistry and paleontology.
作者
牛东风
李保生
舒培仙
王丰年
琚琛琪
李志文
温小浩
司月君
郭亿华
王晨
NIU Dongfeng;LI Baosheng;SHU Peixian;WANG Fengnian;JU Chenqi;LI Zhiwen;WEN Xiaohao;SI Yuejun;GUO Yihua;WANG Chen(Lingnan Normal University,Zhanjiang,Guangdong,524048;South China Normal University,Guangzhou,Guangdong,510631;State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an,Shaanxi,710061;Huizhou University,Huizhou,Guangdong,516007;East China University of Technology,Nanchang,Jiangxi,330013;Nanning Normal University,Nanning,Guangxi,530001;Guangzhou Institute of Geography,Guangzhou,Guangdong,510070)
出处
《地质论评》
CAS
CSCD
北大核心
2019年第5期1217-1228,共12页
Geological Review
基金
国家自然科学基金资助项目(编号:41471159,41071136,415723451)
广东省自然科学基金项目(编号:2015A030310183)的成果~~
作者简介
牛东风,男,1978年生,博士,高级实验师,主要从事第四纪地质学研究与教学工作,Email:33845410@qq.com;通讯作者:李保生,男,1951年生,博士,教授,主要从事全球变化研究;Email:libsh@scnu.edu.cn。
