瑞典Caledonides的Seve推覆复合体UHP沉积中富含Ba和ti的暗云母

Q4 Earth and Planetary Sciences

Mineralogia Pub Date : 2015-06-01 DOI:10.1515/mipo-2017-0001

J. Majka, Ł. Kruszewski, Å. Rosén, I. Klonowska

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引用次数: 4

摘要

摘要本文报道了金刚石稳定场高压变质后减压至麻粒岩相条件的变质沉积岩中赋存特有的富Ba和富ti暗云母。云母以发育良好的保存板条形式出现在石英岩基质中。云母中BaO和TiO2的平均浓度分别为11.54%和7.80wt%。这些成分的最大含量为13.38wt% BaO和8.45wt% TiO2。平均晶体化学式为(K0.54Ba0.39Na0.02Ca0.01)Σ0.96(Fe1.37Mg0.85Ti0.50Al0.29Mn0.01Cr0.01)Σ3.03(Si2.59Al1.41)Σ4.00O10(oh1.300 o0.66 f0.02 s0.01)Σ1.99，主要端元为氧铁石、铁绿石和铁绿石。根据岩石学观察，认为暗云母形成于母岩演化的较晚阶段，即麻粒岩相条件下。

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Ba- and Ti-enriched dark mica from the UHP metasediments of the Seve Nappe Complex, Swedish Caledonides

Abstract We report on the occurrence of peculiar Ba- and Ti-enriched dark mica in metasedimentary rocks that underwent high-pressure metamorphism in the diamond stability field followed by decompression to granulite facies conditions. The mica occurs as well-developed preserved laths in a quartzofeldspathic matrix. The mean concentrations of BaO and TiO2 in the mica are 11.54 and 7.80wt%, respectively. The maximum amounts of these components are 13.38wt% BaO and 8.45wt% TiO2. The mean crystallochemical formula can be expressed as (K0.54Ba0.39Na0.02Ca0.01)Σ0.96(Fe1.37Mg0.85Ti0.50Al0.29Mn0.01Cr0.01)Σ3.03(Si2.59Al1.41)Σ4.00O10(OH1.30O0.66F0.02S0.01)Σ1.99, with oxyannite, oxy-ferrokinoshitalite and siderophyllite as dominating end-members. Based on the petrographical observations, it is proposed that the dark mica was formed at a rather late stage in the evolution of the parental rock, i.e. under granulite facies conditions.

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来源期刊

Mineralogia Earth and Planetary Sciences-Geology

CiteScore

0.80

自引率

0.00%

发文量

期刊介绍： - original papers in the scope of widely understood mineralogical sciences (mineralogy, petrology, geochemistry, environmental sciences, applied mineralogy etc.) - research articles, short communications, mini-reviews and review articles