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Early Cretaceous Climate Changes Recorded in Magnetic Susceptibility and Color Index Variations of the Lower Liupanshan Group, Central China
Author(s) -
Shuang DAI,
Qiang ZHU,
Yongbo HUANG,
Christine DA SILVA A.,
Jie ZHAO,
Junwei LIU,
Li KONG,
Dongxiang PENG,
Lingling LUO,
Ningyun YAN,
Wenjie WANG,
Xiang ZHANG
Publication year - 2016
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12741
Subject(s) - lithology , sedimentology , magnetic susceptibility , geology , facies , cretaceous , relative humidity , physical geography , climate change , paleoclimatology , climatology , paleontology , geography , oceanography , meteorology , chemistry , structural basin , crystallography
This study carried out comprehensive analysis on sedimentology, magnetic susceptibility (χ lf ) 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 χ lf and of the redness (a*), the section can be divided into two segments: (1) 129.14–126.3 Ma, with the lowest χ lf values and strongly variable relatively high values of redness and (2) 126.3–122.98 Ma, with high χ lf 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.