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Paleoaltimetry Potentiality of Branched GDGTs From Southern Tibet
Bai, Y (Bai, Yan)1,2; Chen, CH (Chen, Chihao)1,3; Xu, Q (Xu, Qiang)1; Fang, XM (Fang, Xiaomin)1,2,3

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.

Subject Area地质学
WOS IDWOS:000428401300013
Indexed BySCIE
KeywordAlkane Delta-d Tetraether Membrane-lipids Dialkyl Glycerol Tetraethers Altitudinal Transect Middle Miocene Surface Soils Temperature Calibration Environmental Controls Marine Temperatures Molecular Proxies
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
Cooperation Status国内
Citation statistics
Document Type期刊论文
Corresponding AuthorBai, Y (Bai, Yan)
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing, Peoples R China;
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China;
3.Univ Chinese Acad Sci, Beijing, Peoples R China.
Recommended Citation
GB/T 7714
Bai, Y ,Chen, CH ,Xu, Q ,et al. Paleoaltimetry Potentiality of Branched GDGTs From Southern Tibet[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2018,19(2):551-564.
APA Bai, Y ,Chen, CH ,Xu, Q ,&Fang, XM .(2018).Paleoaltimetry Potentiality of Branched GDGTs From Southern Tibet.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,19(2),551-564.
MLA Bai, Y ,et al."Paleoaltimetry Potentiality of Branched GDGTs From Southern Tibet".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 19.2(2018):551-564.
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