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Minerals 2019, 9, 766 3 of 21 The Morsleben salt structure is located in the northeastern part of the Subherzynian basin, at the Minerals 2019, 9, x FOR PEER REVIEW 3 of 22 southern rim of the Zechstein basin. In this region, Zechstein salt migrated into the NW–SE trending Allertal fault zone [33] and underwent various types of deformation. The main salt migration took Allertal fault zone [33] and underwent various types of deformation. The main salt migration took place from the Upper Triassic to Cretaceous periods with material inflow mainly from the west to the place from the Upper Triassic to Cretaceous periods with material inflow mainly from the west to east [34]. The salt body is primarily regarded as a tectonic structure and not a halokinetic one [34]. the east [34]. The salt body is primarily regarded as a tectonic structure and not a halokinetic one In the Morsleben mine, brine samples of two influxes have been collected and analysed sporadically [34]. In the Morsleben mine, brine samples of two influxes have been collected and analysed since 1907, and continuously since 1991 [35]. sporadically since 1907, and continuously since 1991 [35]. References [10,36] already linked elevated Li concentrations in brines to be originated from References [10] and [36] already linked elevated Li concentrations in brines to be originated phyllosilicate-bearing strata (also see References [8,37]). Typical lithostratigraphic units of this type are, from phyllosilicate-bearing strata (also see References [8,37]). Typical lithostratigraphic units of this for example, the Grauer Salzton (z3GT), Leinekarbonat (z3LK), Hauptanhydrit (z3HA), Tonmittelsalz type are, for example, the Grauer Salzton (z3GT), Leinekarbonat (z3LK), Hauptanhydrit (z3HA), (z3TM), Roter Salzton (z4RT) and the Tonbrockensalz (z4TS) (Figure 2). Tonmittelsalz (z3TM), Roter Salzton (z4RT) and the Tonbrockensalz (z4TS) (Figure 2). Figure 2. Simplliiffiied stratiigraphiic scheme off the Zechsteiin (Upper Permian) in the North German Zechstein Basin from Reference [5], modifified. Thiicknessseess off the stratigraphiic units according to Reference [5] (Gorleben) and References [34,,38] ((Morrslleben).. Arrows display stratigraphic units containing signiffiicant amounts of possible Li-sources in phyllosilicate-bearing strata. The “Hauptanhydrit” (z3HA) is an anhydrite rock unit, with a thickness of ca. 40–80 m. The unit The “Hauptanhydrit” (z3HA) is an anhydrite rock unit, with a thickness of ca. 40–80 m. The is subdivided into 13 zones, distinguishable by differences in composition, sedimentary-diagenetic unit is subdivided into 13 zones, distinguishable by differences in composition, structures, grain size and thickness. The base of the Hauptanhydrit is characterized by ca. 4 wt. % sedimentary-diagenetic structures, grain size and thickness. The base of the Hauptanhydrit is carbonate (mainly magnesite, minor dolomite and calcite) and traces of quartz and mica. In certain characterized by ca. 4 wt. % carbonate (mainly magnesite, minor dolomite and calcite) and traces of areas, the magnesite content can increase to 22 wt. %, caused by algal layers [5,39]. At the top of the quartz and mica. In certain areas, the magnesite content can increase to 22 wt. %, caused by algal layer, the magnesite content decreases to ca. 2 wt. % [39]. layers [5,39]. At the top of the layer, the magnesite content decreases to ca. 2 wt. % [39]. The footwall of the Hauptanhydrit consists of the “Grauer Salzton” (z3GT), a maximum of 2.5 m The footwall of the Hauptanhydrit consists of the “Grauer Salzton” (z3GT), a maximum of 2.5 thick phyllosilicate-bearing rock and the “Leine-Karbonat” (z3LK), a carbonate rock of maximum m thick phyllosilicate-bearing rock and the “Leine-Karbonat” (z3LK), a carbonate rock of maximum 1.5 m thickness. The composition of these stratigraphic units differs, depending on the sedimentary 1.5 m thickness. The composition of these stratigraphic units differs, depending on the sedimentary conditions and the position within the Zechstein basin due to the transport distance of clastic material conditions and the position within the Zechstein basin due to the transport distance of clastic from the backcountry. material from the backcountry. In Gorleben, in the centre of the basin, the composition is more homogeneous. The main In Gorleben, in the centre of the basin, the composition is more homogeneous. The main components of the z3GT are anhydrite (ca. 55 wt. %), hydrotalcite, chlorite and quartz, and the minor components of the z3GT are anhydrite (ca. 55 wt. %), hydrotalcite, chlorite and quartz, and the components are magnesite, halite, illite and kaolinite [5]. The z3LK consists of magnesite and anhydrite, minor components are magnesite, halite, illite and kaolinite [5]. The z3LK consists of magnesite and only trace amounts of hydrotalcite were observed [5]. anhydrite, only trace amounts of hydrotalcite were observed [5]. In Morsleben, at the rim of the basin, the main components of the z3GT are quartz, muscovite-illite (ca. 30 wt. % each), with additional trace amounts of tourmaline, chlorite, serpentine and halite [39]. The z3LK consists of magnesite (ca. 56 wt. %), anhydrite (ca. 20 wt. %) and minor amounts of quartz, muscovite-illite, koenenite, chlorite and calcite [39].PDF Image | Lithium Occurrences in Brines from Two German Salt Deposits
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