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Mercury Emanations from the Baikal Rift: Evidence from the Study of Annual Tree Rings (an Example of the Tunka Depression)
Doklady Earth Sciences ( IF 0.9 ) Pub Date : 2021-03-04 , DOI: 10.1134/s1028334x21010190
L. P. Rikhvanov , E. E. Lyapina , D. V. Yusupov , E. M. Tursunalieva , A. A. Pavlova

Abstract

The phenomenon of natural degassing of mercury in the Baikal Rift Zone is considered on the basis of study of the annual rings of poplar (Populus suaveolens Fisch.) and pine (Pinus sylvestris L.) trees. Tree core samples were collected in the Tunka Depression in July 2018 using a drill. The boundaries of the annual rings were highlighted on a LINTAB instrument with TSAP-Win and Lignovision software. Analysis of Hg was performed on a RA-915M mercury analyzer by pyrolysis. The dynamics of changes in the concentration of Hg in the annual rings of poplar and pine trees in the Tunka Depression from 1940 to 2018 was studied. The average Hg content in all wood cores examined was 7 ppb with a maximum of 1089 ppb. The high Hg contents are confined to faults of both sublatitudinal and northwestern striking. The maximum concentration of Hg was detected in pine and poplar cores at the intersection of large tectonic faults. A relationship between the peaks of high Hg concentrations of in wood and periods of strong earthquakes with a magnitude of >4.0 was revealed. The data obtained may be paleoindicators of deformations of the Earth’s crust, recording both individual processes of short-term relaxation of tectonic stresses and the earthquakes themselves.



中文翻译:

贝加尔湖裂谷的汞排放:年轮年轮研究的证据(通卡洼地的一个例子)

摘要

在对杨树(Populus suaveolens Fisch。)和松树(Pinus sylvestris)的年轮研究的基础上,考虑了贝加尔湖裂谷带中汞的自然脱气现象。L.)树木。使用钻头于2018年7月在Tunka凹陷中采集树木核心样本。带有TSAP-Win和Lignovision软件的LINTAB仪器突出显示了年轮的边界。汞的分析是在RA-915M汞分析仪上通过热解进行的。研究了1940年至2018年通卡De陷杨树和松树年轮中Hg的浓度变化动态。所有检查的木芯中的平均Hg含量为7 ppb,最大为1089 ppb。高汞含量仅限于沿纬向和西北走向的断层。在大型构造断层的相交处,在松树和杨树芯中检测到最大的汞含量。揭示了木材中高汞含量的峰值与强地震> 4.0级之间的关系。获得的数据可能是地壳变形的古指标,记录了构造应力短期松弛的各个过程以及地震本身。

更新日期:2021-03-04
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