Diatom Assemblages from the Daginsky Mud Volcano Sediments (Eastern Sakhalin) and Their Implication

IF 2.3 Q2 GEOSCIENCES, MULTIDISCIPLINARY Quaternary Pub Date : 2023-09-05 DOI:10.3390/quat6030049
I. Tsoy, A. V. Sorochinskaya
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Abstract

Diatom assemblages in mud volcanoes are quite rare and are poorly studied. The finding of a rich diatom flora in the sediments of the Daginsky Mud Volcano (DMV), located in the tidal zone of the Nyisky Bay of the Sea of Okhotsk, is of interest to study the conditions for the formation of host sediments in the zone of influence of various extreme factors, such as outflows of gases and water–mud mass, thermal springs, and tides. For this purpose, the taxonomical composition of diatom assemblages and concentration of diatoms in DMV sediments were studied. A comparison was made with the diatoms of geothermal springs of the Russian Far East associated with volcanic activity, and the stratigraphic occurrence of the found extinct diatoms was analyzed, which is important for determining their source and the age of the mud volcano roots. Diatom assemblages from DMV sediments are mainly characterized by the predominance of Metascolioneis tumida, Paralia sulcata, Odontella aurita, Pinnunavis yarrensis, Petroneis marina, Cocconeis scutellum, and Navicula digitoradiata. They consist of diatoms of different biotopes and extinct species. The diversity and abundance of brackish water and marine species indicates the predominant influence of sea waters on the formation of DMV sediments. The diverse freshwater species were mainly introduced into sediments with river runoff, but it is likely that some of these, such as the cosmopolitan alkaliphilic species, are inhabitants of geothermal springs. The presence of extinct species from the underlying Neogene sediments from where they were carried with gas–water–mud masses is the most typical for diatom assemblages of the DMV.
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东库页岛达吉斯基泥火山沉积物中的硅藻组合及其意义
泥火山中的硅藻组合非常罕见,研究也很少。位于鄂霍次克海尼伊斯基湾潮汐带的达吉斯基泥火山(Daginsky Mud Volcano, DMV)沉积物中发现了丰富的硅藻植物群,这对于研究在各种极端因素(如气体和水泥块的流出、温泉和潮汐)的影响下形成宿主沉积物的条件具有重要意义。为此,对DMV沉积物中硅藻组合的分类组成和硅藻浓度进行了研究。并与俄罗斯远东地区与火山活动有关的地热泉中的硅藻进行了对比,分析了已灭绝硅藻的地层产状,这对确定泥火山根系的来源和年龄具有重要意义。DMV沉积物中的硅藻组合以Metascolioneis tumida、Paralia sulcata、Odontella aurita、Pinnunavis yarrensis、Petroneis marina、Cocconeis scutellum和Navicula digitoradiata为主。它们由不同生物群落和灭绝物种的硅藻组成。咸淡水和海洋物种的多样性和丰度表明海水对DMV沉积物形成的主要影响。不同的淡水物种主要是随河流径流进入沉积物,但其中一些物种,如世界性的嗜碱物种,很可能是地热泉的居民。新近纪沉积物中已灭绝物种的存在是DMV硅藻组合最典型的特征,这些物种与气-水-泥团一起被携带。
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来源期刊
Quaternary
Quaternary GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.30
自引率
4.30%
发文量
44
审稿时长
11 weeks
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