Groundwater geochemistry, hydrogeology and potash mineral potential of the Lake Woods region, Northern Territory, Australia

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F19%3A10396650" target="_blank" >RIV/00216208:11310/19:10396650 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=GE1cCvmg-h" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=GE1cCvmg-h</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1080/08120099.2018.1543208" target="_blank" >10.1080/08120099.2018.1543208</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Groundwater geochemistry, hydrogeology and potash mineral potential of the Lake Woods region, Northern Territory, Australia

Popis výsledku v původním jazyce

We collected 38 groundwater and two surface-water samples in the semi-arid Lake Woods region of the Northern Territory to better understand the hydrogeochemistry of this system, which straddles the Wiso, Tennant Creek and Georgina geological regions. Lake Woods is presently a losing waterbody feeding the underlying groundwater system. The main aquifers comprise mainly carbonate (limestone and dolostone), siliciclastic (sandstone and siltstone) and evaporitic units. The water composition was determined in terms of bulk properties (pH, electrical conductivity, temperature, dissolved oxygen, redox potential), 40 major, minor and trace elements, and six isotopes (O-18(water), H-2(water), C-13(DIC), S-34(SO4)2-, O-18(SO4)2-, Sr-87/Sr-86). The groundwater is recharged through infiltration in the catchment from monsoonal rainfall (annual average rainfall approximate to 600mm) and runoff. It evolves geochemically mainly through evapotranspiration and water-mineral interaction (dissolution of carbonates, silicates and to a lesser extent sulfates). The two surface waters (one from the main creek feeding the lake, the other from the lake itself) are extraordinarily enriched in O-18 and H-2 isotopes (O-18 of +10.9 and +16.4 parts per thousand VSMOW, and H-2 of +41 and +93 parts per thousand VSMOW, respectively), which is interpreted to reflect evaporation during the dry season (annual average evaporation approximate to 3000mm) under low humidity conditions (annual average relative humidity approximate to 40%). This interpretation is supported by modelling results. The potassium (K) relative enrichment (K/Cl- mass ratio over 50 times that of sea water) is similar to that observed in salt-lake systems worldwide that are prospective for potash resources. Potassium enrichment is believed to derive partly from dust during atmospheric transport/deposition, but mostly from weathering of K-silicates in the aquifer materials (and possibly underlying formations). Further studies of Australian salt-lake systems are required to reach evidence-based conclusions on their mineral potential for potash, lithium, boron and other low-temperature mineral system commodities such as uranium.

Název v anglickém jazyce

Groundwater geochemistry, hydrogeology and potash mineral potential of the Lake Woods region, Northern Territory, Australia

Popis výsledku anglicky

We collected 38 groundwater and two surface-water samples in the semi-arid Lake Woods region of the Northern Territory to better understand the hydrogeochemistry of this system, which straddles the Wiso, Tennant Creek and Georgina geological regions. Lake Woods is presently a losing waterbody feeding the underlying groundwater system. The main aquifers comprise mainly carbonate (limestone and dolostone), siliciclastic (sandstone and siltstone) and evaporitic units. The water composition was determined in terms of bulk properties (pH, electrical conductivity, temperature, dissolved oxygen, redox potential), 40 major, minor and trace elements, and six isotopes (O-18(water), H-2(water), C-13(DIC), S-34(SO4)2-, O-18(SO4)2-, Sr-87/Sr-86). The groundwater is recharged through infiltration in the catchment from monsoonal rainfall (annual average rainfall approximate to 600mm) and runoff. It evolves geochemically mainly through evapotranspiration and water-mineral interaction (dissolution of carbonates, silicates and to a lesser extent sulfates). The two surface waters (one from the main creek feeding the lake, the other from the lake itself) are extraordinarily enriched in O-18 and H-2 isotopes (O-18 of +10.9 and +16.4 parts per thousand VSMOW, and H-2 of +41 and +93 parts per thousand VSMOW, respectively), which is interpreted to reflect evaporation during the dry season (annual average evaporation approximate to 3000mm) under low humidity conditions (annual average relative humidity approximate to 40%). This interpretation is supported by modelling results. The potassium (K) relative enrichment (K/Cl- mass ratio over 50 times that of sea water) is similar to that observed in salt-lake systems worldwide that are prospective for potash resources. Potassium enrichment is believed to derive partly from dust during atmospheric transport/deposition, but mostly from weathering of K-silicates in the aquifer materials (and possibly underlying formations). Further studies of Australian salt-lake systems are required to reach evidence-based conclusions on their mineral potential for potash, lithium, boron and other low-temperature mineral system commodities such as uranium.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10508 - Physical geography

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Australian Journal of Earth Sciences

ISSN

0812-0099

e-ISSN

—

Svazek periodika

66

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

AU - Austrálie

Počet stran výsledku

20

Strana od-do

411-430

Kód UT WoS článku

000466535400004

EID výsledku v databázi Scopus

2-s2.0-85060548311