Westerwald steinzeug - Google Search | Westerwald | Pinterest12), implying that the source of the youngest magmas was similar to that of the early volcanic phase of the westerwald–siebengebirge and possibly hocheifel. it should be noted that some of the lavas from this study resemble the high-ti basanites from the vogelsberg (bogaard & wörner, 2003) and that most of the westerwald lavas show different trends from the vogelsberg lavas in al2o3 and mgo. lavas from the westerwald (eifel group) with high ce/pb of about 30 have 206pb/204pb between about 19·4 and 19·6, whereas vogelsberg group lavas with high ce/pb have lower 206pb/204pb between 19·0 and 19·4 (fig. two lava groups can be defined based on the sr–nd isotope trends: (1) the eifel group contains lavas from the eifel, westerwald and siebengebirge; (2) the vogelsberg group contains vogelsberg and hessian depression lavas.) (b) (ce/yb)n vs 206pb/204pb for the vogelsberg group lavas and westerwald lavas. this paper, we present new geochemical and sr, nd, and pb isotopic data for a suite of tertiary volcanic rocks from the westerwald and vogelsberg areas. na2o and k2o concentrations increase with increasing sio2 up to ∼63 wt % sio2; several of the vogelsberg margin lavas have higher contents in both alkali elements than the westerwald lavas and the most primitive rocks from the vogelsberg volcano (fig. largedownload slide(a) neodymium vs sr isotope ratios for the westerwald, vogelsberg, eifel, siebengebirge and hessian depression lavas (wörner et al. crustal thickness for the westerwald region is from prodehl et al. largedownload slide(a) 143nd/144nd vs sio2 for lavas from the westerwald and vogelsberg compared with the field of eifel granulite xenoliths. samples were taken in the westerwald volcanic field and from small occurrences (remnants of lava flows, plugs and necks) in the region surrounding the westerwald (fig. dry mantle at 3 gpa produces magmas with about 45 wt % sio2 similar to the uncontaminated alkali basalts of the westerwald (jaques & green, 1980; kushiro, 1996).
Restaurants in Dornburg/Westerwald -3:sr, nd, and pb isotope compositions of representative westerwald and vogelsberg region samples sample age (ma) 87sr/86sr(0) 87sr/86sr(t) 143nd/144nd(0) 143nd/144nd(t) 206pb/204pb(0) 207pb/204pb(t) 208pb/204pb(0) 206pb/204pb(t) 207pb/204pb(0) 208pb/204pb(t) 010-11 basanite (24) 0·703492 (6) 0·70344 0·512854 (12) 0·51283 19·570 15·612 39·291 19·45 15·61 39·16 p02-1 hawaiite 24 0·703470 (7) 0·70342 0·512880 (6) 0·51286 19·601 15·606 39·276 19·49 15·60 39·15 p06-2 alk. consequently, we define an ‘eifel’ group consisting of lavas from the eifel, siebengebirge and westerwald region in contrast to the lavas with lower 87sr/86sr and 206pb/204pb from the vogelsberg region and hessian depression, which form the ‘vogelsberg’ group (figs 5 and 6). lavas from the westerwald region span a range of compositions from basanites and picrobasalts to trachytes, whereas the samples from the vogelsberg margin consist of basanites and alkali basalts (fig. the volcanics from the vogelsberg (bogaard & wörner, 2003) plot on the same trend as the westerwald lavas but have even higher ce/pb than the westerwald samples (fig. the samples from the westerwald region fall into the eifel group whereas the samples from the vogelsberg margin are similar to the vogelsberg volcanic rocks (fig. the crustal thickness beneath the westerwald is about 30 km and several low-velocity layers have been identified in both the crust and the mantle beneath the region (prodehl et al. together with these concentrations we use average isotope compositions of the uncontaminated eifel and westerwald group lavas, respectively (table 4). (b) diagram of 207pb/204pb vs 206pb/204pb, showing that westerwald, eifel and siebengebirge lavas generally have higher 206pb/204pb than vogelsberg and hessian depression lavas. largedownload slide(a) diagram of ce/pb vs 206pb/204pb showing positive correlations between lavas from the vogelsberg and hessian depression (the vogelsberg group) and also for the westerwald lavas (eifel group).(1) the composition of the westerwald lavas ranges from basanitic to trachytic whereas the lavas from the margin of the vogelsberg volcanic field are more alkaline basanites and alkali basalts. largedownload slidediagram of 87sr/86sr isotopes (a) and 143nd/144nd (b) vs 206pb/204pb for the westerwald, vogelsberg/hessian depression, and eifel/siebengebirge lavas. the average mantle has been inferred to have a potential temperature of 1300°c (mckenzie & bickle, 1988), implying an upper limit of the excess temperature of 100°c for any mantle plume that might have existed beneath the westerwald 20 myr ago.
the lavas of the westerwald region overlie devonian and carboniferous sedimentary and volcanic rocks of the rhenish massif. the westerwald and vogelsberg region mafic magmas contain ti-augites with cores having relatively high al contents and low ti/al ratios similar to the high-pressure clinopyroxenes in the alkaline magma series from the eifel and slovakia (duda & schmincke, 1985; dobosi & fodor, 1992). of tertiary continental intra-plate lavas from the westerwald region, germany. themen rund um die partnersuche fragen zum online datingdas perfekte online-profilblind-date bad marienberg/westerwaldpartnervermittlung bad marienberg/westerwaldgay dating bad marienberg/westerwaldpartnersuche 50plus bad marienberg/westerwalddating bad marienberg/westerwaldsingle-chat bad marienberg/westerwaldreisepartner findenpartnervermittlung ab 50 bad marienberg/westerwaldsenioren-partnersuche bad marienberg/westerwaldpartnersuche 40plus bad marienberg/westerwald. largedownload slide(a) map of the area of tertiary to quaternary volcanic activity between the eifel and siebengebirge (sg) in the west, the westerwald in the centre, and the vogelsberg and hessian depression in the east. thus, both experimental constraints and our ree model suggest that the highly undersaturated magmas of the westerwald may have formed in a garnet peridotite mantle source with a potential temperature of around 1400°c (fig. largedownload slide(a) (dy/yb)n vs (ce/yb)n and (b) k/la vs (ce/yb)n for the westerwald and vogelsberg margin data compared with the vogelsberg lavas from bogaard & wörner (2003). the significant crustal contamination of the westerwald and vogelsberg basalts with more than 48 wt % sio2 implies that there are no primary sio2-rich basaltic (∼tholeiitic) magmas which would reflect shallow and high-degree partial melts of the mantle. in contrast, magma generation beneath the westerwald region in tertiary times may have been due to a mantle plume with an excess temperature of about 100°c, consistent with the velocity anomaly observed at present beneath the eifel (ritter et al. männer von 20 bis 25 bad marienberg/westerwaldmänner von 25 bis 35 bad marienberg/westerwaldmänner von 36 bis 45 bad marienberg/westerwaldmänner von 46 bis 55 bad marienberg/westerwaldmänner von 56 bis 65 bad marienberg/westerwaldmänner von 66 bis 75 bad marienberg/westerwald© photographee. most of the westerwald magmas may have formed in the garnet peridotite stability field (55% olivine–20% orthopyroxene–21% clinopyroxene–4% garnet) whereas vogelsberg magmas may have formed shallower at the garnet–spinel peridotite transition (55% olivine–20% orthopyroxene–21% clinopyroxene–1·5% garnet–2·5% spinel). residual phlogopite appears less likely than amphibole because phlogopite fractionates k/la even more efficiently than amphibole and also fractionates ba/la significantly, whereas ba/la is relatively constant in the uncontaminated westerwald and vogelsberg lavas (fig.
most of the data from the westerwald and the vogelsberg lie on a negative trend between (ce/yb)n and sio2 (fig. vogelsberg volcanic field lavas with the same 143nd/144nd have lower 87sr/86sr than westerwald, eifel and siebengebirge samples..dating westerwald pottery - Google SearchDeutschlandrheinland-pfalzkreis altenkirchen/westerwaldaltenkirchen/westerwaldkontaktanzeigesingle-frauen er sucht sie - single-frauen in altenkirchen/westerwald ich suchefrauenmännerim alter von18192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899bis18192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899ort / plz aktuell 1. 2:compositions of lavas from the westerwald (w) and vogelsberg margin (vm) sample: 001-1 (w) 010-11 (w) 010-4 (w) 011-1 (w) p 02-1 (w) p 03-1 (w) p 04-1 (w) p 06-2 (w) p 07-1 (vm) p 08-1 (vm) p 11-1 (vm) p 13-2 (vm) p 16-1 (vm) rechtswert:* 34 37,675 34 37,300 34 37,300 34 41,100 34 55,760 34 53,900 34 55,920 34 64,320 34 66,450 34 69,550 34 74,200 34 75,360 34 78,620 hochwert:* 56 22,010 56 19,700 56 19,700 56 19,100 56 11,400 56 04,650 56 04,200 56 01,720 55 99,500 56 08,380 56 08,880 56 09,100 56 14,750 age (ma):† 24 23·6 20·9 9·3 16·4 16·6 15 15·8 rock type:‡ basanite basanite basanite basanite hawaiite basanite basanite alk. the sample suite consists mainly of mafic lavas and intrusive rocks; however, samples from the southwestern part of the westerwald are mainly felsic lavas. westerwald lavas have higher 206pb/204pb but generally lower (ce/yb)n than most vogelsberg group lavas with 206pb/204pb >19·0. some of the westerwald region lavas lie at the radiogenic (high 206pb/204pb) end of the highly variable pb isotope compositions observed in the tertiary volcanic rocks from the eifel to the west of the vogelsberg (fig. (b) enlarged map of the study area indicating the sample locations; •, westerwald region; ○, vogelsberg region. crustal thickness for the westerwald region is from prodehl et al. 9a) indicates that the primitive westerwald magmas formed in the presence of residual garnet. observed variations in pb and sr isotope composition for the crustal end-members that have contaminated the two lava groups imply that there are significant differences in crustal composition between the western region of the eifel, siebengebirge and westerwald and the eastern volcanic region of the vogelsberg and hessian depression. we speculate that a distinct isotopic boundary occurs in the lower crust between the area of the eifel, siebengebirge and westerwald in the west and the eastern region of the vogelsberg and hessian depression.