首页> 外文期刊>Contributions to Mineralogy and Petrology >A comment on ultrahigh-temperature metamorphism from an unusual corundum + orthopyroxene intergrowth bearing Al-Mg granulite from the Southern Marginal Zone, Limpopo Complex, South Africa, by Belyanin et al.
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A comment on ultrahigh-temperature metamorphism from an unusual corundum + orthopyroxene intergrowth bearing Al-Mg granulite from the Southern Marginal Zone, Limpopo Complex, South Africa, by Belyanin et al.

机译:Belyanin等人评论了南非兰姆波波综合体南部边缘带的异常刚玉+邻苯二茂合物共生的Al-Mg粒状矿物的超高温变质。

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Studies on the Southern Marginal Zone (SMZ) of the Limpopo Belt have generally concluded that this terrain was affected by a single granulite-facies metamorphic event at 2.67-2.66 Ga (Kroner et al. 2000; Kreissig et al. 2000; Zeh et al. 2005; Elington and Armstrong 2004; Stevens and Van Reenen 1992a, b; Barton and van Reenen 1992; Barton et al. 1992; Van den Berg and Huizenga 2001; Rigby et al. 2008), with peak metamorphic conditions of 7.5-9.5 kbar and 800-850℃. In their recent paper, Belyanin et al. (2012) propose an ultrahigh-temperature (UHT) metamorphic event in the SMZ, with peak metamorphic conditions in excess of 1,000℃ at approximately 12 kbar. Similar conclusions were proposed by earlier work on the same rock (Belyanin et al. 2010). The proposed UHT conditions are based on Al-rich orthopyroxene and ternary feldspar thermometry using reintegrated feldspar compositions. This evidence is derived from a single outcrop containing unusual aluminous layers within metasedimentary granulites, although Tsunogae et al. (2004) used Al-in-orthopyroxene and ternary feldspar thermometry to argue for a peak metamorphic temperature of >950℃ from more representative metapelitic granulites of the Bandelierkop formation. Both these studies have proposed that UHT metamorphism affected the SMZ generally and thus that the relevant PT path of all rocks traversed UHT conditions.
机译:对林波波带南部边缘带(SMZ)的研究普遍得出结论,该地形受2.67-2.66 Ga的单个花岗岩相变质事件的影响(Kroner等人2000; Kreissig等人2000; Zeh等人(2005年; Elington和Armstrong,2004年; Stevens和Van Reenen,1992a,b; Barton和van Reenen,1992年; Barton等,1992年; Van den Berg和Huizenga,2001年; Rigby等,2008年),峰值变质条件为7.5-9.5。 kbar和800-850℃。 Belyanin等人在最近的论文中。 (2012年)提出了SMZ中的超高温(UHT)变质事件,在约12 kbar时,峰值变质条件超过1,000℃。在同一块岩石上的早期工作也提出了类似的结论(Belyanin等,2010)。提议的UHT条件是基于富铝的邻苯二茂和使用重新整合的长石成分的三元长石测温法。尽管Tsunogae等人[13]认为,这一证据是从单个露头中获得的,而该露头在变质沉积颗粒中含有不寻常的铝层。 (2004年)使用邻位邻苯二茂铝和三元长石测温法,从班德里尔科普地层的更具代表性的变质粒岩中提出了最高950℃的峰值变质温度。这两项研究都表明,UHT的变质作用总体上影响了SMZ,因此所有岩石的相关PT路径都穿越了UHT条件。

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