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Early Cretaceous Climate Change: Constraint from Color and Magnetic Susceptibility of Sediments from Liupanshan Group in Liupanshan Basin

Author: ZhuQiang
Tutor: DaiShuang
School: Lanzhou University
Course: Physical Geography
Keywords: Chroma Magnetic susceptibility Paleoclimate Early Cretaceous Liupan group Liupan
CLC: P618.13
Type: Master's thesis
Year: 2009
Downloads: 23
Quote: 1
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Abstract


Cretaceous is an important turning point for the evolution of global tectonic environment, the location of the land and sea changes that occurred during the global reorganization of the atmospheric circulation, biological evolution, such as a series of major events laid the foundation for the formation of global current tectonic environment pattern; same time, the Cretaceous \Liupanshan Basin is located in the center of the of mainland China, the basin interior continuous outcrop in Liupanshan group sediments record the Early Cretaceous paleoclimate information. By the high density of high-precision magnetic stratigraphic control of the Lower Cretaceous sediments Liupanshan group sampling and chromaticity, magnetic susceptibility measurements of the northern basin fire Shizhaishan profile, for the first time obtained a of 124.6 ~ 100Ma period of high-resolution color, the magnetization rate change sequence; to 121Ma and 108.3Ma, for the sector is divided into three different stages of change, wherein Ⅰ segment (124.6 ~ 121Ma) value to the low brightness, high redness and yellowness, low magnetic susceptibility characteristics, corresponding to the mainly of sandstone with purple-red to the tune of the-profile lower Mitsuhashi group on the alluvial fan facies and the monk Shop Braided River - fan delta, overall reflect an extremely hot and dry climate state; of Ⅱ segment (121 ~ 108.3Ma) and Ⅲ segment (108.3 ~ 100Ma) chromaticity values ??close to, but inconsistent trends, the former brightness from high to low to the high, redness and yellowness contrary, corresponds to the Liwa Gap - horse Dongshan shallow lake - semi-deep lake The former sedimentary environment variegated - green rock series; while the latter overall display a gradual process, and the brightness gradually reduce redness and yellowness increased gradually; magnetic susceptibility also has a similar trend, in general, reflect the relatively warm and humid climate main, and a drought event occurred in the the 115 ~ 113.46Ma period, which climate dries again. Chroma and magnetic susceptibility variation analysis, combined with the pollen data and global Cretaceous climate change trend overall, the Liupanshan group recorded early Cretaceous climate mainly dry heat, but there are also relatively dry heat - temperature and humidity changes, its evolution can be divided into early climate is relatively dry and hot (about 127 to 121Ma) Interim relatively warm and humid climate (121 ~ 108.3Ma) and late climate is relatively dry heat (108.3 ~ 100Ma) three climatic stages near them to the boundary of two the next major climate transition event for the sector, two major climate transition event performance occurred in the the 121Ma climate by dry heat suddenly converted to temperature and humidity, and occurs suddenly turned hot and dry by the temperature and humidity in the climate of 108.3Ma.

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