meteoric water


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Related to meteoric water: vadose water

meteoric water

[‚mēd·ē′ȯr·ik ′wȯd·ər]
(hydrology)
Groundwater which originates in the atmosphere and reaches the zone of saturation by infiltration and percolation.
References in periodicals archive ?
[delta][sup.18]O - [delta][sup.2]H (relative to Vienna Standard Mean Ocean Water (VSMOW)) relationship in mound 2 and depression 2, at the large gilgai (LG) site, August 2015 sampling (LMWL, local meteoric water line).
Diagenetic products such as micritization, cementation, chemical compaction and dolomitization were observed in the formation and point toward the role of groundwater and meteoric water during the burial of sediments.
The anomaly fluoride group At4 may occur when volcanic gases (HF) are condensed into meteoric waters and accompany high levels of Cl and S[O.sub.4] (Nicholson, 1993) where the other At springs do not show this particularity.
Fluid inclusion microthermometric analyses display salinity values supporting dominantly meteoric water. Nevertheless, the [[delta].18][O.sub.water] value of the mineralizing fluid calculated from clumped isotope measurements range from -0.2 to 1%, while the meteoric water signature usually ranged from -3 to 10 [per thousand] (SMOW) at the corresponding latitude from the Permian to Late Cretaceous [54].
The [delta][sup.18]O and [delta][sup.2]H values (Table 4), plotted in Figure 12 in relation to the Global Meteoric Water Line (GMWL: [delta][sup.2]H = 8[delta]18O + 10) [34] and the Regional Meteoric Water Line of Sfax, Tunisia (SMWL: [delta][sup.2]H = 8[delta][sup.18]O + 13.5) [35, 36], show that most of the groundwater samples are located below the GMWL and near the SMWL which indicates water evaporation in the unsaturated zone.
Meteoric water are responsible for the modification of dolomitization phases and dissolution.
In addition, the Mn element content in the karst cave-filling calcite and karst breccia was higher than that in the bedrock, indicating that they were formed through complete open meteoric water karstification conditions (Huang et al., 2006; Huang et al., 2008) because the respective contents of Sr and Mn are lower and higher in meteoric water than those in seawater (Walter et al., 2000; Huang et al., 2008).
Calcite recrystallization is due to the percolation of meteoric water and subareal processes.
It is obvious that the surface water data fall exactly on the Global Meteoric Water Line, GMWL, whereas both the rainwater and groundwater samples are relatively enriched, with shallower slopes and deuterium excess (d-excess) values (Figure 3).
Some researchers [7,22] believe that manganese increases along with meteoric diagenetic processes, because the distribution coefficient of Mn is high in the meteoric waters so that reaches about 15ppm, in conclusion considerable amount of Mn will be entered into the calcite network.
However, interaction with midto low-latitude meteoric water or seawater can also produce such compositions (Longstaffe 1982).
The Arctic Ocean that supplies Nares Strait carries a meteoric water end-member signal of-18.8 [+ or -] 2[per thousand], which has been calculated from a flow-weighted average of river runoff (Cooper et al., 2008).