Geochemical and isotopic (U, Th) variations in lake waters in the Qinghai Lake Basin, Northeast Qinghai-Tibet Plateau, China: origin and paleoenvironmental implications
Geochemical and isotopic (U, Th) variations in lake waters in the Qinghai Lake Basin, Northeast Qinghai-Tibet Plateau, China: origin and paleoenvironmental implications
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中国青藏高原东北部青海湖流域湖水地球化学和同位素（U、Th）变化：起源及其古环境意义
DOI：
10.1007/s12517-019-4255-x
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发表时间：
2019-02
影响因子：
--
通讯作者：
Zhao Chen
中科院分区：
文献类型：
--
作者：
Zhang Pu;Cheng Hai;Liu Weiguo;Mo Lingtong;Li Xiangzhong;Ning Youfeng;Ji Ming;Zong Baoyun;Zhao Chen
对青藏高原东北部青海湖湖水样品进行了铀地球化学研究，以探讨湖水化学的主要控制因素。青海湖湖水234 U/238 U活度比在空间和垂直方向上的变化有限，与世界河流的实测值（（234 U/238 U）= 1.171）相比相对较高，低于青海湖流域内的四条河流。U浓度也变化极小，在三个垂直采样剖面，并表现出在表面沃茨的空间格局，与总溶解固体（TDS）值和盐度浓度的分布。这些数据表明，U，TDS和盐度的变化部分控制蒸发或不同的二级浓度途径。此外，U浓度和234 U/238 U活度比表明，这一过程的长度，这是由水-岩相互作用的持续时间控制，可能是一个重要的因素，考虑到位于相似的地理区域的湖泊的可变盐度。230 ThXS主要来源于溶解态234 U的衰变。水柱中观察到的不同230 Thxs浓度反映了青海湖不同的清除停留时间，范围从0.7到4年不等。较低的水团年龄，如在网站123，表明更快的清除率。溶解的232 Th通过成岩物质的不完全溶解而进入湖中，如尘埃气溶胶或其他成岩源（例如，湖床沉积物或悬浮的河流沉积物）。232 Th浓度数据表明，湖水中Th浓度受3个过程的控制：（1）气溶胶粉尘的溶解作用，（2）河流和湖泊沉积物的溶解作用，（3）水体中Th的清除作用。
A uranium (U) geochemical study of lake water samples from Qinghai Lake, Northeast Qinghai-Tibet Plateau, China, was undertaken to assess the primary controls on lake water chemistry. The234U/238U activity ratios of lake water exhibited limited spatial and vertical variations and were relatively high compared to the values measured in rivers worldwide ((234U/238U) = 1.171), lower than in the four river discharge inside the Lake Qinghai catchment. The U concentrations also varied minimally within three vertical sampling profiles and exhibited spatial patterns in surface waters that correlated with the distribution of total dissolved solid (TDS) values and salinity concentrations. These data suggest that the variability in U, TDS, and salinity are partially controlled by evaporation or a different secondary concentration pathway. Moreover, the U concentration and234U/238U activity ratio indicates that the length of this procedure, which is controlled by the duration of water-rock interaction, is probably an important factor to consider when accounting for the variable salinities of lakes located in similar geographical areas. The230ThXScontent is primarily derived from the decay of dissolved234U. The various230Thxs concentrations observed in the water column are interpreted to reflect various scavenging residence times in Qinghai Lake, ranging from 0.7 to 4 years. The lower water mass age, such as at site 123, suggests a more rapid scavenging rate. Dissolved232Th is placed into the lake via the incomplete dissolution of lithogenic substances, such as dust aerosol, or other lithogenic sources (e.g., lake bed sediment or suspended riverine sediment). Water column232Th concentration data suggest that the Th concentrations of the lake water are controlled by three processes: (1) the dissolution of aerosol dust, (2) the dissolution of riverine and lake bed sediment, and (3) the scavenging of Th from the water.
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影响因子：
56.9
作者：
R. Anderson;M. Bacon;P. Brewer
通讯作者：
R. Anderson;M. Bacon;P. Brewer
DOI：
10.1016/0031-0182(91)90041-o
发表时间：
1991-05-01
影响因子：
3
作者：
LISTER, GS;KELTS, K;NIESSEN, F
通讯作者：
NIESSEN, F
影响因子：
4
作者：
Zhangdong Jin;Z. An;Jimin Yu;Fuchun Li;Fei Zhang
通讯作者：
Zhangdong Jin;Z. An;Jimin Yu;Fuchun Li;Fei Zhang
影响因子：
2.4
作者：
Henry Lin
通讯作者：
Henry Lin
影响因子：
3.4
作者：
Y. Lucas;A. Schmitt;F. Chabaux;A. Clément;B. Fritz;P. Elsass;S. Durand
通讯作者：
Y. Lucas;A. Schmitt;F. Chabaux;A. Clément;B. Fritz;P. Elsass;S. Durand