傅里叶变换红外光谱(FTIR)方法在南海定量矿物学研究中的应用:以MD01-2393孔为例  

Application of Fourier Transform Infrared (FTIR) Spectroscopy in Quantitative Mineralogy of the South China Sea: Example of Core MD01-2393

作　　者：刘志飞[1] Christophe Colin Alain Trentesaux 

机构地区：[1]同济大学海洋地质教育部重点实验室 [2]Laboratoire Orsayterre, FRE 2566, BAT. 504, Université de Paris XI, 91405 Orsay, France [3]PBDS Laboratoire, UMR 8110 CNRS, Université de Lille Ⅰ, 59655 Villeneuve d'Ascq, France

出　　处：《地球科学（中国地质大学学报）》2005年第1期25-29,共5页Earth Science-Journal of China University of Geosciences

基　　金：国家自然科学基金项目 (Nos.40 1 0 2 0 1 0 ;40 32 1 6 0 3;40 331 0 0 2 ) ;国家重点基础研究发展计划 (No .G2 0 0 0 0 785 0 0 ) ;教育部优秀青年教师资助计划 ;上海市青年科技启明星计划 (No .0 3QE1 40 5 1 ) ;中国科学院创新项目 (KZCX3-SW -2 2 0 )

摘　　要：傅里叶变换红外光谱 (FTIR)方法以其测量多种矿物绝对含量的能力在古环境研究中有很大的优势 .运用FTIR方法分析了南海南部湄公河口MD0 1 - 2 393孔的矿物成分含量 ,对比运用X射线衍射 (XRD)的半定量分析方法 ,研究了青藏高原东部和湄公河盆地晚第四纪 1 90ka以来风化剥蚀演化历史 .结果显示 ,全岩高岭石 /石英和粘土粒级 ( <2 μm)高岭石 /蒙脱石比率可用作陆源区风化侵蚀的矿物学标志 .晚第四纪 190ka以来 ,青藏高原东部和湄公河盆地机械侵蚀作用在冰期比间冰期强 ,化学风化作用在间冰期比冰期强 ,揭示出亚洲季风气候驱动的风化剥蚀演化历史 .全新世期间 ,虽然全岩高岭石 /石英与粘土粒级 ( <2 μm)蒙脱石 /高岭石比率指示相同趋势的风化剥蚀作用 ,但全岩高岭石 /石英比率显示更强的机械侵蚀能力 。The Fourier transform infrared (FTIR) spectroscopy has a large advantage in paleoenvironmental study, through its measurement of various minerals in absolute proportions. This paper reports the mineral contents of Core MD01-2393, located off the Mekong River estuary in the southern South China Sea, using the FTIR method. Along with a comparison of semiquantitative determination by the X-ray diffraction (XRD) method, we present a reconstruction of the erosion and weathering history of the eastern Tibetan plateau and the Mekong basin since 190 ka in the late Quaternary. The results indicate that the bulk kaolinite/quartz ratio and clay-sized (<2 μm) kaolinite/smectites ratio may serve as mineralogical proxies of erosion and weathering occurrence in source areas. Since 190 ka in the eastern Tibetan plateau and the Mekong basin, the mechanical erosion has been stronger in glacials than in interglacials, while the chemical weathering is stronger in interglacials than in glacials, implying an Asian monsoon-controlled erosion and weathering history. During the Holocene, although both the bulk kaolinite/quartz ratio and clay-sized (<2 μm) smectites/kaolinite ratio indicate a similar evolution process of erosion and weathering, the bulk kaolinite/quartz ratio presents a stronger mechanical erosion ability. This phenomenon could be affected by rapid sea-level changes in the Mekong River estuary.

关 键 词：粘土矿物 傅里叶变换红外光谱(FTIR) 晚第四纪 湄公河 南海 

分 类 号：P575.1[天文地球—矿物学]