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The source of boron in Quaternary sediments of Dangxiong Co, Tibetan Plateau, China
Journal of Paleolimnology ( IF 2.1 ) Pub Date : 2020-07-03 , DOI: 10.1007/s10933-020-00129-x Yangbing Luo , Mianping Zheng , Runxiang Ni , Yuan Ling , Yuanyuan Lü , Gao Song
Journal of Paleolimnology ( IF 2.1 ) Pub Date : 2020-07-03 , DOI: 10.1007/s10933-020-00129-x Yangbing Luo , Mianping Zheng , Runxiang Ni , Yuan Ling , Yuanyuan Lü , Gao Song
Dangxiong Co is a salt lake located in the center of the Tibetan Plateau, China. We studied the petrology, mineralogy, geochemistry and microfossil assemblages in the Quaternary, first terrace of Dangxiong Co. Limnocytherellina was the most common ostracode in the first terrace and prefers warm-humid conditions. Grainy ankerite in the terrace exhibits obvious overgrowth edges and uneven surfaces. Rare earth elements and Y distribution patterns in the first terrace show moderate rare earth enrichment, whereas Eu and Dy show weak negative and positive anomalies, respectively. These features indicate that the first terrace in Dangxiong Co is composed of lacustrine hydrothermal deposits. Moreover, the δ 11 B value of the Quaternary travertine is low, reflecting the low values in hydrothermal waters of the Quaternary. We suggest that hydrothermal water has been an important source of boron in the Quaternary. The three rivers on the south side of Dangxiong Co contribute 95% of the B 2 O 3 . The geochemical characteristics and the δ 11 B values of the waters in these three rivers are the same as in waters from Maerzuo hot spring. Thus, the hot spring is still the main source of boron to Dangxiong Co. These results have important implications for future exploration of borate deposits in salt lakes.
更新日期：2020-07-03
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