保加利亚Sakar - strandja地区Sakar单元最西端三叠纪变质沉积岩的变质作用

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Tzvetomila Vladinova, M. Georgieva
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引用次数: 0

摘要

: Sakar - strandja地区最西端Sakar单元(Klokotnitsa村地区)的元沉积层序,包含多种岩性,具有三叠纪原岩时代。在研究区内,萨卡尔单元受马里察右行走滑剪切带框架内的低变质作用的影响,分隔了巴尔干造山系的两个一级单元——罗多彼地块和斯雷诺里地块。为了更好地理解原岩的起源和变质演化,我们提出了变质沉积岩的岩石学、矿物化学数据和热力学模型。三叠纪变质沉积物中的矿物组合表明,沉积原岩含有石英、粘土和碳酸盐矿物(砂岩、粘土和石灰石)。碎屑矿物(石英、钠长石、正长石和副相——锆石、独居石、磷灰石)显示了潜在的花岗岩物源。白云石-绿泥石组合的优势与低温和水饱和条件有关。Perple_X伪剖面结合模拟矿物组合和白云母和绿泥石的矿物化学等面,对应于275 ~ 330℃和3 ~ 4 kbar的变质作用。结果与绿泥石地温计相符。热力学模拟证实了岩石学观测,证实了绿片岩变质条件影响了最西端萨卡尔单元三叠纪沉积盖层。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Metamorphism of the westernmost Triassic metasedimentary rocks in the Sakar unit, Sakar–Strandja zone, Bulgaria
: Metasedimentary sequence from the westernmost Sakar Unit (Klokotnitsa Village area), Sakar–Strandja Zone, comprises a variety of lithologies with Triassic protolith age. In the study area, the Sakar Unit is affected by low-grade metamorphism in the frame of the Maritsa dextral strike-slip shear zone and separates two first-order units of the Balkan orogenic system – the Rhodope massif and the Srednogorie Zone. We present the petrography, mineral chemical data, and thermodynamic modelling of metasediments for a better understanding of the protoliths origin and metamorphic evolution. The mineral assemblages in Triassic metasediments suggest sedimentary protoliths containing quartz, clay, and carbonate minerals (sandstones, clays, and limestones). The detrital minerals (quartz, albite, orthoclase and accessory phases – zircon, monazite, apatite) reveal potential granite source provenance. The dominance of phengite–chlorite association correlates with low temperature and water-saturated conditions. The Perple_X pseudosection, combined with modelled mineral assemblages and mineral chemistry isopleths of muscovite and chlorite, correspond to metamorphism in the range 275–330 °C and 3–4 kbar. The results correspond with a chlorite geothermometer. The thermodynamic modelling corroborates the petrographic observations and proves greenschist metamorphic conditions that affected the Triassic sedimentary cover of the westernmost Sakar Unit.
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来源期刊
Geologica Carpathica
Geologica Carpathica 地学-地球科学综合
CiteScore
2.40
自引率
23.10%
发文量
26
审稿时长
>12 weeks
期刊介绍: GEOLOGICA CARPATHICA covers a wide spectrum of geological disciplines including geodynamics, tectonics and structural geology, volcanology, stratigraphy, geochronology and isotopic geology, karstology, geochemistry, mineralogy, petrology, lithology and sedimentology, paleogeography, paleoecology, paleobiology and paleontology, paleomagnetism, magnetostratigraphy and other branches of applied geophysics, economic and environmental geology, experimental and theoretical geoscientific studies. Geologica Carpathica , with its 60 year old tradition, presents high-quality research papers devoted to all aspects not only of the Alpine-Carpathian-Balkanian geoscience but also with adjacent regions originated from the Mediterranean Tethys and its continental foreland. Geologica Carpathica is an Official Journal of the Carpathian-Balkan Geological Association.
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