气候变化领域集成服务门户(CCPortal): Magnetostratigraphy of Early Oligocene-Middle Miocene Deposits in the Xunhua Basin on the Tibet Plateau, China, and Their Paleoclimate Significance

CCPortal

DOI	10.3390/min13050671
	Magnetostratigraphy of Early Oligocene-Middle Miocene Deposits in the Xunhua Basin on the Tibet Plateau, China, and Their Paleoclimate Significance
	Li, Pengfei; Fu, Chaofeng; Saimaiti, Akemu; Chang, Hong; Tian, Ju'e; Chen, Lin; Qiang, Xiaoke
发表日期	2023
EISSN	2075-163X
卷号	13 期号:5
英文摘要	The growth history of the Tibetan Plateau provides a valuable natural laboratory to understand tectonic processes of the India-Asia collision and their impact on and interactions with Asian and global climate change. However, both Tibetan Plateau growth and Asian paleoenvironments are generally poorly documented in pre-Pliocene times and reflect limited temporal coverage for different parts of the plateau. In this paper, the 238 m thick Cenozoic sediments in the Hongzhuang section of the Xunhua Basin were tested and analyzed via paleomagnetic and environmental magnetic methods. The formation age was determined, and the evolution history of the regional climate environment was analyzed. The magnetostratigraphy study shows that the sediments record a continuous sequence of geomagnetic polarity changes from C5ACn to C10r, which spans an interval of approximately 30 similar to 14.3 Ma from the early Oligocene to the middle Miocene. The magnetic susceptibility of the Hongzhuang section is basically similar to the deep-sea oxygen isotope fluctuation, indicating that the monsoon climate change indicated by the magnetic susceptibility is affected by global temperature. It is worth noting that at similar to 27 Ma and similar to 15 Ma, there is a negative correlation between magnetic susceptibility and deep-sea oxygen isotope, and magnetic susceptibility lags behind the increase in deep-sea oxygen isotope. Combined with the change in the sedimentary rate curve, we explain the asynchrony between the magnetic susceptibility and the deep-sea oxygen isotope around similar to 27 Ma and similar to 15 Ma. As the uplift of the plateau leads to the enhancement of the East Asian summer monsoon, the soil formation in the region is strengthened, resulting in an increase in magnetic susceptibility. At the same time, the rapid uplift of the plateau caused the erosion of the surrounding mountains to strengthen, and the input of near-source materials may promote the increase in magnetic susceptibility.
关键词	Xunhua basin early Oligocene-middle Miocene aeolian red clay magnetic susceptibility paleoenvironment East Asian monsoon
英文关键词	MAGNETIC-SUSCEPTIBILITY; LOESS PLATEAU; QAIDAM BASIN; TECTONIC UPLIFT; XINING BASIN; MODERN SOILS; MA; EVOLUTION; QINGHAI; CLIMATE
WOS研究方向	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
WOS记录号	WOS:000997691100001
来源期刊	MINERALS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283354
作者单位	Chang'an University; Chinese Academy of Sciences; Institute of Earth Environment, CAS
推荐引用方式 GB/T 7714	Li, Pengfei,Fu, Chaofeng,Saimaiti, Akemu,et al. Magnetostratigraphy of Early Oligocene-Middle Miocene Deposits in the Xunhua Basin on the Tibet Plateau, China, and Their Paleoclimate Significance[J],2023,13(5).
APA	Li, Pengfei.,Fu, Chaofeng.,Saimaiti, Akemu.,Chang, Hong.,Tian, Ju'e.,...&Qiang, Xiaoke.(2023).Magnetostratigraphy of Early Oligocene-Middle Miocene Deposits in the Xunhua Basin on the Tibet Plateau, China, and Their Paleoclimate Significance.MINERALS,13(5).
MLA	Li, Pengfei,et al."Magnetostratigraphy of Early Oligocene-Middle Miocene Deposits in the Xunhua Basin on the Tibet Plateau, China, and Their Paleoclimate Significance".MINERALS 13.5(2023).