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Minerals 2019, 9, x FOR PEER REVIEW 9 of 22 Minerals 2019, 9, 766 8 of 21 Morsleben site, the diagrams in Figure 3 are calculated and created for different temperatures (T = 35 °C and T = 25 °C, respectively), representing local geological conditions. the dTiahgeragmeoscihneFmigicuarlec3hareactaelrcuolfathede barnidnecsreiantethdefoanr hdyiffderrietentrotecmk-pberaartiunrgest(rTat=a 3o5f thCeaGnodrTleb=e2n5saClt, drespoescitti,vwelhye),rreetphresmenatxiinmgulomcaclognecoelnotgriactailocnosnodfitLioinins.brines were detected, are displayed in Figure 3a. Theegberioncehsemaricealscahtuaratcetedrowfitherbersinpesctintothehanlihteydarnitde,romckai-nbleya,rincagrnstarlaltitaeo.fStohmeGeobrlreinbesnsaarlet addepdoitsioitn,wallhyerseatuhreamteadxiwmiuthmrceospneccetntroatkioiensseorifteL,ioinrbinrinsoesmweecraesdese,tebcitsecdh,oafriteed.iTsphelaypeHdivnalFuigesurvea3ray. Tbehtewbereine2s.0araendsa6tu.1r.ated with respect to halite and, mainly, carnallite. Some brines are additionally saturTatheedgweoitchhreemspiceaclt ctohakriaesceterriteo,fobrrinessoomcecucarrsiensg, binisctheofiMteo.rTslheebepnHsvitaelu(mesinvianrgy cbleatiwme1ean a2n.0daHnd) a6r.1e. illustTrahtedgeioncFhiegmuricea3lbc.hAarlalcintevreostfibgraitneedssoclcuutirorinsgoifnththeeMoorrsslelebbeennssititeea(rmeisnaitnugractleadimw1iatharnedspHe)ctatroe hilalulistter.aTtehde icnomFipguosreiti3obn. oAfltlhienvsoeslutitgioatnesdfrsomlutmioinsinogf cthlaeimMoHr,ssleabmepnlseidtebaertewseaetnur2a0t0e9dawnidth20re1s4p, sehctotwo shatluitrea.tTiohnewcoitmhproespiteiocnt tofstyhlevsitoeluatniodnisnfproamrtsm, winiitnhgrecslapiemctHto, skaaminpitled. Tbheetwberienes20f0ro9manmdi2n0i1n4g, cslhaoimw 1satuaraetisoantuwriatthedreswpietcht troespylevcittetoancdarinaplalirttes,, wcointhtrroelslepdectbyto EkQai3n/i6te.mTohdeebllriinge.s TfrhoempmHinvinaglucelsaimva1rya bareetwsaeteunra3t.e4danwdit5h.8reisnptehcet tboricnaersnoalflistoel,uctoionntroacllceedssbmy EinQin3g/6cmlaoimdeHlli.ng. The pH values vary between 3.4anTdhe5.L8iincothnecebnrtirnaetsioonfssolfutthioenGaocrclesbsemniannindgMcloarismleHbe.nbrinesvarybetween0.24μg/gand401 μg/gT(AhepLpiencodnixceAn,trTaatibolnes oAf1t,hAe 3GaonrldebAe4n)a[n27d,3M5]o.rsleben brines vary between 0.24 μg/g and 401 μg/g (AppTehnedixLiAc,oTnacbelnestrAat1io,Ans3oanfdMAo4r)sl[e2b7e,3n5]g.roundwater vary between 0.008 μg/g and 0.684 μg/g (AppTehnediLxiAc,oTnacbelnetAra2t)io.nsofMorslebengroundwatervarybetween0.008μg/gand0.684μg/g (Appendix A, Table A2). 3.2. Experimental Investigations 3.2. Experimental Investigations 3.2.1. Lepidolite 3.2.1. Lepidolite Before starting the experiments, the sample material was tested for purity, with respect to Before starting the experiments, the sample material was tested for purity, with respect to lepidolite. lepidolite. X-ray diffraction (XRD) analyses show that the sample material consists of lepidolite and X-ray diffraction (XRD) analyses show that the sample material consists of lepidolite and probably probably trilitionite. Polarizing microscopy of the ground material showed acicular lepidolite trilitionite. Polarizing microscopy of the ground material showed acicular lepidolite (Figure 4a) with (Figure 4a) with some additional aggregates of very fine-grained lepidolite (Figure 4b). The some additional aggregates of very fine-grained lepidolite (Figure 4b). The geochemical analyses of geochemical analyses of the initial lepidolite yield 22.74 wt. % Si (XRF), 8.38 wt. % K, 14.30 wt. % Al, the initial lepidolite yield 22.74 wt. % Si (XRF), 8.38 wt. % K, 14.30 wt. % Al, 2.42 wt. % Li (ICP-OES), 2.42 wt. % Li (ICP-OES), 1.54 wt. % Rb, 0.32 wt. % Cs (ICP-MS) and F (not quantified). Small Cs-rich 1.54 wt. % Rb, 0.32 wt. % Cs (ICP-MS) and F (not quantified). Small Cs-rich domains in lepidolite were domains in lepidolite were detected using SEM-EDS (Quantax EDS for SEM, Bruker Corporation, detected using SEM-EDS (Quantax EDS for SEM, Bruker Corporation, Billerica, MA, USA) (Figure 4c). Billerica, MA, USA) (Figure 4c). Figure44..Micircoropphhotootgorgarpahpshsofoinfitiniailtilaelpildeopliidteo.li(tae).M(ai)croMpihcrootopghroatpohgroafpshcatotfersecdatleteprieddolilteepindoglrioteunidn gmraotuenridalm, +atpeorilarl,iz+erpso.l(abr)izSeErsM. (pbh)oStEoMgraphootofglerpapidholoifteleapgigdroelgitaetea.g(gc)reSgEaMte.p(hco)tSoEgMrapphhoftolegpraidpohliotef wlepitihdaolsitmeawllitChsa-riscmhadlloCmsa-irnic.h domain. The altered material did not differ significantly from the initial lepidolite with respect to mineralogy. The altered material did not differ significantly from the initial lepidolite with respect to The overall grain size and occurrence of aggregates remained the same (Figure 5a,b) with the main mineralogy. The overall grain size and occurrence of aggregates remained the same (Figure 5a,b) difference being locally developed cements, infilling the space between imbricated lepidolite crystals with the main difference being locally developed cements, infilling the space between imbricated (Figure 5c). The cement consists of very fine-grained lepidolite (grain size <10 μm), which probably lepidolite crystals (Figure 5c). The cement consists of very fine-grained lepidolite (grain size <10 ◦◦ formed due to mechanical grinding during the shaking process. μm), which probably formed due to mechanical grinding during the shaking process.PDF Image | Lithium Occurrences in Brines from Two German Salt Deposits
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