Early Cretaceous Climate Changes Recorded in Magnetic Susceptibility and Color Index Variations of the Lower Liupanshan Group, Central China

作     者：DAI Shuang ZHU Qiang HUANG Yongbo DA SILVA Anne-Christine ZHAO Jie LIU Junwei KONG Li PENG Dongxiang LUO Lingling YAN Ningyun WANG Wenjie ZHANG Xiang 

作者机构：Key Laboratory of Western China's Environmental Systems(Ministry of Education)College of Earth and Environmental SciencesLanzhou University Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences Shandong Institute of geological survey Pétrologie sédimentaireB20Allée du Six Ao t12Quartier AgoraUniversitéde Liège State Key Laboratory of Continental DynamicsDepartment of GeologyNorthwest University No.4 Institute of Geological & Mineral Resources Survey of Henan 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2016年第90卷第3期

页      面：1011-1023页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 

基　　金：co-supported by the Chinese NSFC funds (Nos.41272127, 40972025, 40571017) IGCP580 

主　　题：magnetic susceptibility color index climate change Liupanshan Group Early Cretaceous 

摘      要：This study carried out comprehensive analysis on sedimentology, magnetic susceptibility （7of） and color data of the continental sediments of the Liupanshan Group in Central China so as to obtain climatic change information during the 129.14-122.98 Ma interval. Based on the results of the Xlf and of the redness （a＊）, the section can be divided into two segments： （1） 129.14-126.3 Ma, with the lowest Xlf values and strongly variable relatively high values of redness and （2） 126.3-122.98 Ma, with high Elf values and relatively low redness. Analysis of the lithology and facies as well as the magnetic minerals and their contents points to a detrital origin of the magnetic minerals and this allow us to interpret the relationship between magnetic susceptibility variations and climate changes. Our study shows that the climate was significantly dry and hot during the whole studied interval although the interval between 126.3 Ma and 122.98 was a little bit cooler with increased humidity.