首页|Paleoclimatic application of spectral parameters to the eolian red clay of the Jianzha Basin,northeastern margin of the Tibetan Plateau

Paleoclimatic application of spectral parameters to the eolian red clay of the Jianzha Basin,northeastern margin of the Tibetan Plateau

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Reflectance spectroscopy is rapid,inexpensive,and non-destructive and can provide important information about the mineralogy of rocks and sediments.We measured the reflectance spectroscopy of Miocene red clay deposits on the northeastern margin of the Tibetan Plateau,with the aim of developing a rapid methodology for detecting paleoclimatic changes.We obtained visible/near-infrared(VNIR)and short-wave infrared(SWIR)spectroscopy data from the red clay in the Jianzha Basin,and analyzed their relationship with independent paleoclimatic records,including mineral contents and environmental magnetic parameters.The results show that the VNIR parameters,including D500,D900,R500,and R900(where D and R represent the depth and reflectance of the absorption peaks around 500 and 900 nm,respectively)are temperature-sensitive and correlated with the magnetic susceptibility,frequency-dependent magnetic susceptibility,and the marine δ18O record.The results of frequency-domain analysis of the VNIR parameters show that they reflect climate change on orbital timescales.SWIR para-meters,such as AS 1400,D1 400/D 1900 and D1 900(where AS represents the asymmetry of the absorption peaks around 1400 nm),are correlated with the illite and montmorillonite content,and they are sensitive to the weathering intensity.The spectral parameters of the eolian red clay in the Jianzha Basin reflect regional climatic changes caused by the uplift of the Tibetan Plateau at～8.5 Ma and global climatic cooling at～7.2 Ma,and thus they are applicable as both regional and global pa-leoenvironmental indicators.

Visible/near-infrared spectroscopyShort-wave infrared spectroscopyPaleoclimatic indicatorsRed clayTibetan Plateau

Chaofeng FU、Ju'e TIAN、Xinwen XU、Yougui SONG、Jun ZUO、Feng WANG、Lin CHEN、Pengfei LI、Xiaoke QIANG

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The School of Earth Science and Resources,Chang'an University,Xi'an 710054,China

State Key Laboratory of Loess and Quaternary Geology,Institute of Earth and Environment,CAS,Xi'an 710061,China

The School of Earth Science and Resources, Chang'an University, Xi'an 710054, China

College of Urban and Environmental Science,Northwest University,Xi'an 710069,China

CAS Center for Excellence in Quaternary Science and Global Change,Xi'an 710061,China

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Second Tibetan Plateau Scientific Expedition and Research(STEP)ProgramNational Natural Science Foundation of ChinaState Key Laboratory of Loess and Quaternary GeologyCentral University Research Foundation,Chang'an University

2019QZKK0704 & 2019QZKK010142272221 & 41772167SKLLQG1905300102272901

2024

10.1007/s11430-023-1274-1

中国科学:地球科学(英文版)
中国科学院

中国科学:地球科学(英文版)

影响因子：1.002
ISSN：1674-7313
年,卷(期)：2024.67(6)