Amfibol-gazdag harzburgit xenolit fluidumzárvány vizsgálata a Stájer-medencéből

  • László Előd Aradi ELTE-TTK Kőzettan-Geokémiai Tanszék, Litoszféra Fluidum Kutató Labor, e-mail: aradi.laszloelod@gmail.com
  • Márta Berkesi MTA CSFK Lendület Pannon LitH2Oscope Kutatócsoport
  • Csaba Szabó ELTE-TTK Kőzettan-Geokémiai Tanszék, Litoszféra Fluidum Kutató Labor
Kulcsszavak: xenolit, felsőköpeny, fluidumzárvány, fluidum, amfibol, ortopiroxén, flogopit, Stájer-medence

Absztrakt

A Stájer-medence a Kárpát-Pannon régió nyugati szélén helyezkedik el, a Pannon-medence és a Keleti-Alpok közötti átmeneti zónában. A Stájer-medencében plio-pleisztocén alkáli bazaltok mintázták meg a medence alatti litoszféraköpenyt. A köpeny eredetű xenolitok közül ritkaságnak számító, modális metaszomatózison átesett, flogopit- és apatit-tartalmú amfibol-gazdag peridotitok is előkerültek. Jelen munkában egy ilyen, gazdagodott xenolit komplex fluidumzárvány vizsgálatát mutatjuk be. Fluidumzárványokat ortopiroxénben és amfibolban azonosítottunk. Utóbbi ásványban ritkán őrződnek meg köpenyfluidumok zárványai, ezért vizsgálatuk egyedi lehetőséget nyújt a köpenyben vándorló fluidumok megismerésére. Az elsődleges és álmásodlagos zárványok összetételét petrográfiai elemzések után mikrotermometriai és Raman-mikrospektroszkópiai mérések segítségével határoztuk meg.

Az ortopiroxének zárványainak folyadék fázisában a nagy sűrűségű (~1 g/cm3) CO2 a domináns komponens (>95 mol. %), ami mellett H2O-t (<3,5 mol. %) és N2-t (<0,2 mol. %) is kimutattunk. A fluidumzárványokban azonosított szilárd fázisok leányásványok, magnezitből és anhidritből állnak. Amfibolok zárványaiban szintén CO2 a leggyakoribb komponens (>98 mol. %), ami mellett H2O-t (<1,2 mol. %), N2-t (<0,1 mol. %) és a vízben oldott SO42--t azonosítottunk. A szilárd fázisok különböző karbonátokból (magnezit, Na-tartalmú dawsonit, nahkolit és nátrit) és szulfátokból (anhidrit, Na-tartalmú thenardit-burkeit) álló ásványegyüttest alkotnak. A klór-mentes, Na+ és SO42--tartalmú fluidösszetétel egyedinek tekinthető köpenykörülmények között. A fluidum forrása egy illó-gazdag olvadék lehetett, amelyben az amfibol (valamint alárendelten flogopit és apatit) kristályosodása során feldúsultak az illók (C-O-N-S), Na+, HCO3- és SO42-, amelyek csapdázódtak a keletkező amfibolban.

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