气候变化领域集成服务门户(CCPortal): Paleoaltimetry Potentiality of Branched GDGTs From Southern Tibet

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DOI	10.1002/2017GC007122
	Paleoaltimetry Potentiality of Branched GDGTs From Southern Tibet
	Bai, Yan; Chen, Chihao; Xu, Qiang; Fang, Xiaomin
通讯作者	Bai, Y (通讯作者)
发表日期	2018
EISSN	1525-2027
起始页码	551
结束页码	564
卷号	19 期号:2
英文摘要	Paleoaltimetric reconstructions of the southern Tibetan Plateau (TP) are crucial to understand the processes and mechanisms concomitant with the tectonic collision of the Indian and Eurasian continental plates. We measured the branched glycerol dialkyl glycerol tetraether (brGDGT) indices from 88 surface soils from the southern TP and found that alkaline soils exhibited lower MBT and MBT/CBT-derived MAT (mean annual temperature), while MBT/CBT-derived MAT exhibited a strong correlation with altitude (R-2=0.84; n=63) for all of the localities with neutral and acidic soils. Differently, we found that MBT5ME-derived MAT exhibited a strong relation with altitude even though a mixture of alkaline samples (R-2=0.72; n=83). As a result, two regional calibrations were developed, including a neutral and acidic soil calibration based on MBT/CBT-MAT and a calibration suitable for both acidic and alkaline soils based on MBT5ME-MAT for the southern TP. Based on this new soil calibration data set, and a recent global soil calibration data set founded on MBT5ME, we calculated paleo-MAT of approximate to 9.491.15 to 10.381.47 degrees C at approximate to 15 Ma, respectively, for the Namling Basin. Applying these soil calibrations, the paleoaltitudes of the Namling Basin can be calculated to have been between 4.360.41 km above sea level (asl) and 4.430.36 km asl at approximate to 15 Ma, respectively, similar to the paleoaltitudes of approximate to 4.7-5.4 km asl at approximate to 15 Ma inferred from the floral physiognomy of Namling Basin fossils and stable isotopes. These findings would suggest the applicability of MBT/CBT (and/or MBT5ME) indices as paleotopographic and paleotemperature proxies on the southern TP.
关键词	ALKANE DELTA-D TETRAETHER MEMBRANE-LIPIDS DIALKYL GLYCEROL TETRAETHERS ALTITUDINAL TRANSECT ENVIRONMENTAL CONTROLS MOLECULAR PROXIES SURFACE SEDIMENTS OIYUG BASIN SOIL-PH DISTRIBUTIONS
英文关键词	local calibration; Namling Basin; Middle Miocene; paleotemperatures; paleoaltitudes; MBT5ME-MAT
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000428401300013
来源期刊	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259150
推荐引用方式 GB/T 7714	Bai, Yan,Chen, Chihao,Xu, Qiang,et al. Paleoaltimetry Potentiality of Branched GDGTs From Southern Tibet[J]. 中国科学院青藏高原研究所,2018,19(2).
APA	Bai, Yan,Chen, Chihao,Xu, Qiang,&Fang, Xiaomin.(2018).Paleoaltimetry Potentiality of Branched GDGTs From Southern Tibet.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,19(2).
MLA	Bai, Yan,et al."Paleoaltimetry Potentiality of Branched GDGTs From Southern Tibet".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 19.2(2018).