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Paleomagnetic age constraints and paleoclimate implications from Miocene fine-grained sediments of the Tianshui Basin, western China
ZHANG Jun 1 *,LI Jijun 1,SONG Chunhui 2,ZHAO Zhijun 3,XIE Guangpu 4,WANG Xiuxi 1,HUI Zhengchuang 1,PENG Tingjiang 1
1.Key Laboratory of Western China' s Environmental Systems (Ministry of Education) , Research School of Arid Environment and Climate Change, Lanzhou University, Lanzhou, Gansu 730000, China
2. School of Earth Sciences, Key Laboratory of Western China’s Environmental Systems (Ministry of Education), Lanzhou University, Lanzhou, Gansu 730000, China
3. College of Geography, Nanjing Normal University, Nanjing, Jiangsu 210097, China
4.Gansu Provincial Museum, Lanzhou, Gansu 730050, China
*Correspondence author
#Submitted by
Subject:
Funding: Specialized Research Fund for the Doctoral Program of Higher Education of China (No.20090211120027), NSFC National Innovative Research Team Project (No.Grant No. 41021091), National Natural Science Foundation of China (No.Grant No. 41101012))
Opened online:25 September 2012
Accepted by: none
Citation: ZHANG Jun,LI Jijun,SONG Chunhui.Paleomagnetic age constraints and paleoclimate implications from Miocene fine-grained sediments of the Tianshui Basin, western China[OL]. [25 September 2012] http://en.paper.edu.cn/en_releasepaper/content/4489893
 
 
Miocene strata from the Tianshui Basin of western China have received intense attention recently because these sediments have been interpreted as some of the earliest loess deposits in eastern Asia. Detection of lower Miocene loess revises the estimated timing of inland Asian desertification from 8 Ma back to 22 Ma. However, strata with diagnostic sedimentary structures irreconcilable with eolian loess are also commonly observed in the Tianshui Basin. Therefore, constraining ages of fine-grained sediments in the Tianshui Baisn will provide a test of recent provocative interpretations about the initiation of inland Asian desertification. Here we date an interval of fine-grained sediments with non-eolian sedimentary structures from the Tianshui Basin and find that age of this succession is quite similar to the purported lower Miocene loess deposits. We argue that more diagnistic provenance tools need be applied to fine-grained Miocene sediments from the Tianshui Basin before one can confidently state that these sediments are indeed loess and inland Asian desertification had occurred by 22 Ma.
Keywords:Magnetostratigraphy; geochronology; Neogene; paleoenvironment; Tianshui Basin
 
 
 

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