Minerály těžké frakce arkózových pískovců z Tismic u Českého Brodu (perm blanické brázdy, Česká republika)

Q3 Earth and Planetary Sciences

Bulletin Mineralogie Petrologie Pub Date : 2021-01-01 DOI:10.46861/bmp.29.337

Z. Dolníček, Jana Ulmanová

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引用次数: 1

Abstract

The heavy mineral concentrate originating from Permian freshwater sandstones/arkoses from the Tismice site (northern part of the Blanice Furrow, Bohemian Massif, Czech Republic) was studied in terms of mineral composition and chemical composition of selected phases. Ilmenite, to various degree altered to a TiO2 phase and/or unidentified non-stoichiometric Fe-Ti (hydro)oxides, is the predominating constituent of heavy mineral fraction. Garnet, tourmaline, apatite and baryte are subordinate components. Garnet (with commonly etched “drusy” surface) belongs exclusively to almandine (Alm45-91Prp4-27Sps1-32Grs0-17Adr0-5). Tourmaline has variable chemical composition, but oxy-dravite prevails. Accessory phases include biotite, REE-rich goyazite (Goy45-59Flo29-43Cra11-17Gor0-1), zircon, pyrite, limonite, gahnite (Ghn57-68Hrc21-32Spl7-10Mgt1-2Gal1), staurolite, xenotime and monazite. Baryte and goyazite were likely formed during diagenesis of the host sediments or during later hydrothermal activity. Detrital garnet and tourmaline were probably sourced from the granulites, mica schists and migmatites of the Malín segment of the neighbouring Kutná Hora Crystalline Complex (KHCC). Surprisingly, amphibolites or serpentinites, frequently present in areas of the KHCC more proximal to the Permian sedimentary basin, did not contribute their garnets. We suggest that these areas were not exposed to erosion during the Permian period. Spectacular etching of surface of garnets and pervasive alteration of ilmenite were associated with burial diagenesis of the host sediments.

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ČeskýBrod附近Tismic（捷克共和国Perm Blanickérrow）的长石砂岩重组分矿物

研究了来自Tismice遗址(捷克共和国波西米亚地块Blanice沟北部)的二叠纪淡水砂岩/粗砂岩的重矿物精矿的矿物组成和选定相的化学组成。钛铁矿在不同程度上转变为TiO2相和/或未确定的非化学计量的Fe-Ti(氢)氧化物，是重矿物组分的主要成分。石榴石、电气石、磷灰石和重晶石是次要成分。石榴石(通常蚀刻“锈”表面)只属于铝石榴石(Alm45-91Prp4-27Sps1-32Grs0-17Adr0-5)。电气石的化学成分多变，但主要是氧驱石。辅相包括黑云母、富ree的Goy45-59Flo29-43Cra11-17Gor0-1、锆石、黄铁矿、褐铁矿、锌长石(Ghn57-68Hrc21-32Spl7-10Mgt1-2Gal1)、橄榄石、xenotime和独居石。重晶石和goyazite可能是在宿主沉积物成岩作用或后期热液活动中形成的。碎屑石榴石和电气石可能来自邻近的库特纳霍拉结晶杂岩Malín段的麻粒岩、云母片岩和杂岩。令人惊讶的是，在KHCC更接近二叠纪沉积盆地的地区经常出现的角闪岩或蛇纹岩并没有贡献石榴石。我们认为这些地区在二叠纪时期没有受到侵蚀。石榴石表面的显著蚀刻和钛铁矿的普遍蚀变与寄主沉积物的埋藏成岩作用有关。

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来源期刊

Bulletin Mineralogie Petrologie Earth and Planetary Sciences-Economic Geology

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期刊介绍： Bulletin Mineralogie Petrologie is a peer-reviewed journal focused especially on: mineralogy, crystal chemistry and study of crystal structures of minerals study of mineral associations and processes of their origin meteoritics, research of tectites economic geology (of ore deposits) and study of history of mining of ore deposits topographic mineralogy petrology of igneous, metamorphic and sedimentary rocks instrumental analytical methods at mineralogy and petrology mineralogy and petrology as tools for archeology and similar disciplines