干旱区生态环境知识资源中心(Arid): Geomorphic and hydrological controls on groundwater dolocrete formation in the semi-arid Hamersley Basin, northwest Australia

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DOI	10.1002/esp.4704
	Geomorphic and hydrological controls on groundwater dolocrete formation in the semi-arid Hamersley Basin, northwest Australia
	Mather, Caroline C.1,2; Nash, David J.3,4; Dogramaci, Shawan 1,2,5; Grierson, Pauline F.1,2; Skrzypek, Grzegorz 1,2
通讯作者	Mather, Caroline C.
来源期刊	EARTH SURFACE PROCESSES AND LANDFORMS
ISSN	0197-9337
EISSN	1096-9837
出版年	2019
卷号	44 期号:14 页码:2752-2770
英文摘要	Groundwater dolocretes may exert an important geomorphic control on landscape evolution within sub-humid to arid regions. However, the geomorphic and hydrogeological settings of dolocrete remain poorly described. The hydrochemical conditions of dolomite precipitation in groundwater environments are also not well known. Classic models of dolocrete formation explain dolomite precipitation from highly evolved groundwaters at the terminus of major drainage but do not explain dolocrete distributed in regionally elevated landscapes, upgradient of major drainage. This study investigated the mineralogy, micromorphology and stable carbon and oxygen isotope compositions of three dolocrete profiles within a regionally elevated sub-basin of the Hamersley Ranges in the Pilbara region of northwest Australia. We sought to establish the environmental and hydrochemical conditions and present a model for dolocrete formation. We found that dolocrete formed within zones of emerging groundwater under saline-evaporitic conditions within internally draining sub-basins, most likely during the Late Miocene and Pliocene. Saline-evaporitic conditions were indicated by: (i) the mineralogy, dominated by dolomite, palygorskite and smectite; (ii) desiccation features and the presence of phreatic and vadose cements, indicative of a shallow fluctuating water table, and; (iii) dolomite delta O-18 values (median = -5.88 parts per thousand). Dolomite precipitation was promoted by evaporation and carbon dioxide degassing from shallow magnesium (Mg)-rich groundwater. These factors appear to have been the major drivers of dolocrete development without a requirement for significant down-dip hydrochemical modification. Primary dolomite precipitation was possible due to the presence of microbial extracellular polymeric substances (EPS). EPS provided negatively charged nucleation sites, which bound Mg2+, overcoming kinetic effects. High microbial activity within groundwater systems suggest these processes may be important for dolocrete formation worldwide and that groundwater dolocretes may be more pervasive in landscapes than currently recognized. (c) 2019 John Wiley & Sons, Ltd.
英文关键词	dolomite stable isotopes chemical sediments microbial EPS landform evolution
类型	Article
语种	英语
国家	Australia ; England ; South Africa
开放获取类型	Green Published
收录类别	SCI-E
WOS记录号	WOS:000480888900001
WOS关键词	CHANNEL IRON DEPOSITS ; DOLOMITE FORMATION ; STABLE-ISOTOPE ; MICROBIAL MEDIATION ; CARBONATE DEPOSITS ; PROVENCE BASIN ; LAGOA-VERMELHA ; EBRO BASIN ; PRECIPITATION ; CALCRETE
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
来源机构	University of Western Australia
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215094
作者单位	1.Univ Western Australia, West Australian Biogeochem Ctr, Sch Biol Sci M090, 35 Stirling Highway, Crawley, WA 6009, Australia; 2.Univ Western Australia, Ecosyst Res Grp, Sch Biol Sci M090, 35 Stirling Highway, Crawley, WA 6009, Australia; 3.Univ Brighton, Sch Environm & Technol, Brighton, E Sussex, England; 4.Univ Witwatersrand, Sch Geog Archaeol & Environm Studies, Johannesburg, South Africa; 5.Rio Tinto Iron Ore, Perth, WA, Australia
推荐引用方式 GB/T 7714	Mather, Caroline C.,Nash, David J.,Dogramaci, Shawan,et al. Geomorphic and hydrological controls on groundwater dolocrete formation in the semi-arid Hamersley Basin, northwest Australia[J]. University of Western Australia,2019,44(14):2752-2770.
APA	Mather, Caroline C.,Nash, David J.,Dogramaci, Shawan,Grierson, Pauline F.,&Skrzypek, Grzegorz.(2019).Geomorphic and hydrological controls on groundwater dolocrete formation in the semi-arid Hamersley Basin, northwest Australia.EARTH SURFACE PROCESSES AND LANDFORMS,44(14),2752-2770.
MLA	Mather, Caroline C.,et al."Geomorphic and hydrological controls on groundwater dolocrete formation in the semi-arid Hamersley Basin, northwest Australia".EARTH SURFACE PROCESSES AND LANDFORMS 44.14(2019):2752-2770.