Инд. авторы:	Wang H., Liu W., Liu H., Cao Y., Hu J., Liu Z., He Y., Zhou A., Zhao H., Meng B., Jiang J., Kolpakova M.N, Krivonogov S.K.
Заглавие:	Salinity-controlled isomerization of lacustrine brgdgts impacts the associated mbt5me' terrestrial temperature index
Библ. ссылка:	Wang H., Liu W., Liu H., Cao Y., Hu J., Liu Z., He Y., Zhou A., Zhao H., Meng B., Jiang J., Kolpakova M.N, Krivonogov S.K. Salinity-controlled isomerization of lacustrine brgdgts impacts the associated mbt5me' terrestrial temperature index // Geochimica et Cosmochimica Acta. - 2021. - Vol.305. - P.33-48. - ISSN 0016-7037. - EISSN 1872-9533.
Внешние системы:	DOI: 10.1016/j.gca.2021.05.004; РИНЦ: 46893704;
Реферат:	eng: Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are microbial molecular fossils ubiquitous in natural environments. The correlation between the Methylation Index of brGDGTs (the MBT5ME' paleothermometer) and temperature offers an important tool for reconstructing past terrestrial temperatures. However, factors other than temperature could also affect the distribution of brGDGTs in lacustrine systems, hampering the quantitative application of this paleothermometer. Here we investigated brGDGT distributions in contemporary sediments collected from 52 lakes in mid-latitude Asia. Combined with published brGDGT data from other lakes across the globe, we have found a strong salinity control on the relative abundance of 5-methyl brGDGTs versus their late-eluting isomers (including 6-methyl, 7-methyl, and unknown isomers). This allows the development of novel indices based on the isomerization of brGDGTs for tracing past lake water salinity. We also demonstrate that salinity-controlled isomerization of pentamethylated and hexamethylated brGDGTs can significantly impact the MBT5ME' paleothermometer, potentially leading to an overestimation of past temperature, but the temperature signal can be extracted out of the MBT5ME' index after correcting the salinity effect. As demonstrated in application to a Lake Qinghai (China) sediment core spanning the last 18 kyr, our finding could facilitate the simultaneous retrieval of reliable temperature and salinity records using brGDGTs in lacustrine settings, in particular for lakes that have experienced large salinity changes during the geological past.
Ключевые слова:	temperature; salinity; BrGDGTs; MBT5ME'; isomerization;
Издано:	2021
Физ. характеристика:	с.33-48
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