The source of boron in Quaternary sediments of Dangxiong Co, Tibetan Plateau, China
- PDF / 3,338,852 Bytes
- 12 Pages / 547.087 x 737.008 pts Page_size
- 53 Downloads / 174 Views
(0123456789().,-volV) ( 01234567 89().,-volV)
ORIGINAL PAPER
The source of boron in Quaternary sediments of Dangxiong Co, Tibetan Plateau, China Yangbing Luo . Mianping Zheng . Runxiang Ni . Yuan Ling . Yuanyuan Lu¨ . Gao Song
Received: 18 January 2016 / Accepted: 19 May 2020 Ó Springer Nature B.V. 2020
Abstract 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 d11B 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
Y. Luo M. Zheng Y. Ling Y. Lu¨ G. Song MLR Key Laboratory of Saline Lake Resources and Environments, Institute of Mineral Resources, CAGS, Beijing 100037, China Present Address: M. Zheng (&) Institute of Mineral Resources, Chinese Academy of Geological Sciences, No. 26, Baiwanzhuang Street, Beijing 100037, China e-mail: [email protected] R. Ni Rural Energy and Environment Agency, Ministry of Agriculture and Rural Affairs, Beijing 100125, China
source of boron in the Quaternary. The three rivers on the south side of Dangxiong Co contribute 95% of the B2O3. The geochemical characteristics and the d11B 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. Keywords Dangxiong Co salt lake Late Pleistocene Carbonate clay Lacustrine hydrothermal sedimentation Salt lake borate deposits
Introduction Boron is used in ceramics, detergents, fertilizers and glass. With increasing development of the world economy, borate demand is increasing. At present, boron is recovered primarily from mines with boronbearing minerals. Salt-lake borate has not been exploited as a major B source, although salt-lake boron recovery is economical and environmentally friendly, if salinity-gradient solar ponds are used (Yu et al. 2015). We explored salt-lake borate deposits in light of increasing global borate demand. The origin of boron in salt lakes is important to explore when considering the feasibility of exploiting lacustrine borate deposits. Searles Lake, California (USA), is enriched in boron and is closely associated
123
J Paleolimnol
with a boron geothermal spring in the endorheic Searles Valley (Juske 1990; Smith 1966). Death Valley, lo
Data Loading...
