干旱区生态环境知识资源中心(Arid): Authigenic Minerals of the Derbent and South Caspian Basins (Caspian Sea): Features of Forms, Distribution and Genesis under Conditions of Hydrogen Sulfide Contamination

Arid

DOI	10.3390/min12010087
	Authigenic Minerals of the Derbent and South Caspian Basins (Caspian Sea): Features of Forms, Distribution and Genesis under Conditions of Hydrogen Sulfide Contamination
	Kozina, Nina; Reykhard, Liudmila; Dara, Olga
通讯作者	Kozina, N (corresponding author)，Russian Acad Sci, Shirshov Inst Oceanol, 36 Nakhimovskiy Prospect, Moscow 117997, Russia.
来源期刊	MINERALS
EISSN	2075-163X
出版年	2022
卷号	12 期号:1
英文摘要	This paper presents the results of complex lithological, mineralogical, and geochemical studies of bottom sediments of deep-water basins of the Caspian Sea (Derbent and South Caspian Basins) in areas contaminated by hydrogen sulfide. In the course of complex studies, numerous manifestations of authigenic mineral formation associated with the stage of early diagenesis have been established. Authigenic minerals belonging to the groups of sulfates (gypsum, barite), chlorides (halite), carbonates (calcite, low Mg-calcite; kutnohorite), and sulfides (framboidal pyrite), as well as their forms and composition, have been identified by a complex of analytical methods (X-ray diffractometry (XRD), scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS); atomic absorption spectroscopy (AAS); coulometric titration (CT)); the nature of their distribution in bottom sediments has been assessed. Carbonates and sulfates are predominant authigenic minerals in the deep-water basins of the Caspian Sea. As a part of the study, differences have been established in the composition and distribution of associations of authigenic minerals in the bottom sediments in the deep-water basins. These are mineral associations characteristic of the uppermost part of the sediments (interval 0-3 cm) and underlying sediments. In the Derbent Basin, in sediments of the interval 3-46 cm, an authigenic association is formed from gypsum, calcite, magnesian calcite, siderite, and framboidal pyrite. An association of such authigenic minerals as gypsum and calcite is formed in sediments of the 0-3 cm interval. In the South Caspian Basin, in sediments of the interval 3-35 cm, an association of such authigenic minerals as gypsum, halite, calcite, magnesian calcite, and framboidal pyrite is formed. The association of such authigenic minerals as gypsum, halite, calcite, magnesian calcite, kutnohorite, and framboidal pyrite is characteristic of sediments of the 0-3 cm interval. We consider the aridity of the climate in the South Caspian region to be the main factor that determines the appearance of such differences in the uppermost layer of sediments of the basins. Judging by the change in the composition of authigenic associations, the aridity of the South Caspian increased sharply by the time of the accumulation of the upper layer of sediments (interval 0-3 cm). Taking into account lithological, mineralogical and geochemical data, the features of the processes of authigenic mineral formation in the deep-water basins of the Caspian Sea under conditions of hydrogen sulfide contamination have been determined. Analysis of the results obtained and published data on the conditions of sedimentation in the Caspian Sea showed that hydrogen sulfide contamination recorded in the bottom layer of the water column of the deep-water basins of the Caspian Sea may affect the formation of authigenic sulfides (framboidal pyrite), sulfates (gypsum), and carbonates (calcite and kutnohorite) associated with the activity of sulfate-reducing bacteria in reducing conditions.
英文关键词	bottom sediments modern sedimentation processes mineralogy geochemistry authigenic minerals hydrogen sulfide contamination arid climate Caspian Sea
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000756986200001
WOS关键词	MODERN BOTTOM SEDIMENTS ; WATER COLUMN ; BARITE MINERALIZATION ; CRUISE ; SYSTEM ; METHANE ; MATTER ; MULTIDISCIPLINARY ; FLUXES ; OCEAN
WOS类目	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
WOS研究方向	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/376666
作者单位	[Kozina, Nina; Reykhard, Liudmila; Dara, Olga] Russian Acad Sci, Shirshov Inst Oceanol, 36 Nakhimovskiy Prospect, Moscow 117997, Russia
推荐引用方式 GB/T 7714	Kozina, Nina,Reykhard, Liudmila,Dara, Olga. Authigenic Minerals of the Derbent and South Caspian Basins (Caspian Sea): Features of Forms, Distribution and Genesis under Conditions of Hydrogen Sulfide Contamination[J],2022,12(1).
APA	Kozina, Nina,Reykhard, Liudmila,&Dara, Olga.(2022).Authigenic Minerals of the Derbent and South Caspian Basins (Caspian Sea): Features of Forms, Distribution and Genesis under Conditions of Hydrogen Sulfide Contamination.MINERALS,12(1).
MLA	Kozina, Nina,et al."Authigenic Minerals of the Derbent and South Caspian Basins (Caspian Sea): Features of Forms, Distribution and Genesis under Conditions of Hydrogen Sulfide Contamination".MINERALS 12.1(2022).