Obtaining and managing groundwater data is difficult as it common for time series datasets representing levels at wells to have large gaps of missing data. To address this issue, many methods been developed infill or impute the We present a method improving imputation through an iterative refinement model (IRM) machine learning framework that works on any aquifer dataset where each well has com...

Sustainable groundwater management requires an accurate characterization of aquifer-storage change over time. This process begins with analysis historical water levels at observation wells. However, water-level records can be sparse, particularly in developing areas. To address this problem, we developed imputation method to approximate missing monthly averaged groundwater-level observations in...

Abstract. The origin of large miarolitic (also known as “chamber”) pegmatites is not fully understood although they may have great economic value. formation cavities in magmatic bodies related to melt degassing and gas or fluid flow through partially solidified magma. In this paper, the Volyn pegmatite field, located Palaeoproterozoic Korosten anorthosite–mangerite–charnockite–granite (AMCG) co...

Abstract The Wolfsberg lithium deposit in Austria is one of the largest Li-Cs-Ta pegmatite resources Europe. part Austroalpine Unit Pegmatite Province Eastern Alps that formed during high-temperature, low-pressure Permian extensional event and was subsequently overprinted by Cretaceous eclogite-facies metamorphism Alpine orogeny. two types distinguished at deposit, amphibolite hosted-(AHP) mica...

Lithium-bearing polymetallic pegmatite ores are an important raw material for lithium extraction. They contain not only but also other associated elements such as beryllium, tantalum, and niobium, with great recovery values. It is therefore often called lithium-bearing ore (LPPO). The utilization of Be-bearing minerals in LPPOs have yet to be further studied. This paper briefly expounds the geo...

Abstract Raman spectroscopic analysis was performed on columbite-(Mn) samples from a variety of previously studied rare-element pegmatites in Xinjiang, China, including the Jing'erquan No. 1 spodumene-subtype, Dakalasu beryl–columbite-subtype and Kalu'an spodumene-subtype pegmatites, to quantify relationship between degree metamictisation columbite spectra. For all analysed columbites-(Mn), pos...

A Correction to this paper has been published: https://doi.org/10.1007/s12517-021-06960-4

Himalayan leucogranites are abundant within a ~2000-km-long, E-W trending belt on the Tibetan Plateau. Recently, it has been shown that several and pegmatites (including aplites) of Himalayan leucogranitic closely related to rare-metal mineralization. The commonly peraluminous strongly peraluminous, classifying as highly-fractionated granites in terms whole-rock geochemistry chara...