干旱区生态环境知识资源中心(Arid): Variability of Carbonate Isotope Signatures in a Hydrothermally Influenced System: Insights from the Pastos Grandes Caldera (Bolivia)

Arid

DOI	10.3390/min10110989
	Variability of Carbonate Isotope Signatures in a Hydrothermally Influenced System: Insights from the Pastos Grandes Caldera (Bolivia)
	Bougeault, Cedric; Durlet, Christophe; Vennin, Emmanuelle; Muller, Elodie; Ader, Magali; Ghaleb, Bassam; Gerard, Emmanuelle; Virgone, Aurelien; Gaucher, Eric C.
通讯作者	Bougeault, C
来源期刊	MINERALS
EISSN	2075-163X
出版年	2020
卷号	10 期号:11
英文摘要	Laguna Pastos Grandes (Bolivia), nesting in a volcanic caldera, is a large, palustrine-to-lacustrine system fed by meteoric and hydrothermal calco-carbonic fluids. These different fluid inputs favor a complex mosaic of depositional environments, including hydrothermal springs, pools, and an ephemeral lake, producing abundant present-day carbonates developing over a Holocene carbonate crust dated by U-Th. Present-day carbonates (muds, concretions, and microbialites) recorded a large range of isotope variations, reaching 13.9 parts per thousand in delta C-13 and 11.1 parts per thousand in delta O-18. Sedimentological and geochemical data indicated that the main processes influencing the isotope record were: (i) rapid CO2 degassing and temperature decreases along hydrothermal discharges; (ii) strong evaporation favored by the arid high-altitude Andean climate, locally enhanced by capillary water rise within microbial mats or by wind-induced spray falling on vadose concretions. Unlike past or present perennial lake systems in Central Andes, the short residence time of brine waters in the ephemeral central lake prevents enrichment of lacustrine carbonates in C-13 and O-18. The very low fraction modern (FC)-C-14 in these present-day carbonates demonstrates that incorporation of fossil magmatic carbon related to the volcanic context also prevents any radiocarbon dating. The use of isotopes for the interpretation of ancient continental series should always be accompanied by a thorough characterization of the environmental setting.
英文关键词	carbonates lacustrine hydrothermal stable isotopes spatial analysis Altiplano
类型	Article
语种	英语
开放获取类型	gold, Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000594020800001
WOS关键词	PUNA VOLCANIC COMPLEX ; CHILEAN ALTIPLANO ; SUBDUCTION ZONES ; CENTRAL ANDES ; HOT-SPRINGS ; DISEQUILIBRIUM ; PRECIPITATION ; MICROBIALITES ; OXYGEN ; LAKES
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/2XILL650/327750
作者单位	[Bougeault, Cedric; Durlet, Christophe; Vennin, Emmanuelle] Univ Bourgogne Franche Comte, Biogeosci, CNRS, UMR 6282, 6 Blvd Gabriel, F-21000 Dijon, France; [Muller, Elodie; Ader, Magali; Gerard, Emmanuelle] Univ Paris, CNRS, Inst Phys Globe Paris, F-75005 Paris, France; [Ghaleb, Bassam] Univ Quebec Montreal, Geotop, CP 8888,Succ Ctr Ville, Montreal, PQ H3C 3P8, Canada; [Virgone, Aurelien; Gaucher, Eric C.] TOTAL CSTJF, Ave Larribau, F-64018 Pau, France
推荐引用方式 GB/T 7714	Bougeault, Cedric,Durlet, Christophe,Vennin, Emmanuelle,et al. Variability of Carbonate Isotope Signatures in a Hydrothermally Influenced System: Insights from the Pastos Grandes Caldera (Bolivia)[J],2020,10(11).
APA	Bougeault, Cedric.,Durlet, Christophe.,Vennin, Emmanuelle.,Muller, Elodie.,Ader, Magali.,...&Gaucher, Eric C..(2020).Variability of Carbonate Isotope Signatures in a Hydrothermally Influenced System: Insights from the Pastos Grandes Caldera (Bolivia).MINERALS,10(11).
MLA	Bougeault, Cedric,et al."Variability of Carbonate Isotope Signatures in a Hydrothermally Influenced System: Insights from the Pastos Grandes Caldera (Bolivia)".MINERALS 10.11(2020).