Petrochronological study of chloritoid schist from the Medvednica Mts. (Croatia, Zagorje Mid-Transdanubian zone)

IF 1.1 4区地球科学 Q3 GEOLOGY

Geologia Croatica Pub Date : 2023-02-23 DOI:10.4154/gc.2023.02

Ivan Mišur, D. Balen, U. Klötzli, M. Belak, H. Massonne, Mihovil Brlek, V. Brčić

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引用次数: 2

Abstract

A chloritoid schist from the Medvednica Mts. (Croatia, Zagorje-Mid-Transdanubian zone) is part of the metasedimentary succession of a Palaeozoic-Mesozoic Metamorphic Complex. The studied samples show the mineral association of chloritoid, chlorite, quartz and white mica. A P-T pseudosection, combined with modal and chemical isopleths, and classical thermobarometric calculations yield peak metamorphic conditions of 0.8 – 1.0 GPa at around 500 °C. Monazite in-situ dating with the electron microprobe results in an age of 156 ± 3 (2σ) Ma interpreted as dating monazite growth during prograde metamorphism. Laser ablation multicollector ICP mass spectrometry of U-Th-Pb isotope systematics in detrital zircon grains indicate a maximal deposition time of the sedimentary protolith in the Permian in accordance with published palaeontological records. The presented results are synchronous with the Late Jurassic obduction of a Neotethys-derived ophiolitic mélange onto a Permotriassic sedimentary sequence originated from the continental margin of Adria. This obduction caused regional collision metamorphism by thrusting Ophiolitic units (i.e. Neotethys) upon tectonic units of continental margin of Adria. Studied chloritoid schist is a part of the continental margin of Adria and is metamorphosed during collisional metamorphic event at upper greenschist-facies.

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Medvednica Mts.(克罗地亚，Zagorje - transdanubian中游地区)绿绿片岩的岩石年代学研究

来自Medvednica Mts.(克罗地亚，zagorje -中跨多瑙河带)的绿泥石片岩是古生代-中生代变质杂岩的变质沉积演替的一部分。研究样品显示出类绿泥石、绿泥石、石英和白色云母的矿物组合。P-T伪剖面，结合模态和化学等面，以及经典的热气压计算，在500°C左右的峰值变质条件为0.8 - 1.0 GPa。单独居石原位电子探针测年结果为156±3 (2σ) Ma，解释为单独居石在进变质期生长的测年。用激光烧蚀多收集器ICP质谱法对碎屑锆石颗粒进行U-Th-Pb同位素系统分析，根据已发表的古生物记录，确定了沉积原岩的最大沉积时间为二叠纪。研究结果与晚侏罗世源自新特提斯的蛇绿岩向源自亚德里亚大陆边缘的二叠纪沉积序列的逆推同步。这种逆冲作用通过将蛇绿岩单元(即新特提斯)逆冲到亚德里亚大陆边缘的构造单元上，引起了区域碰撞变质作用。研究的绿绿片岩是亚德里亚大陆边缘的一部分，在上绿片岩相的碰撞变质事件中变质。

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来源期刊

Geologia Croatica GEOSCIENCES, MULTIDISCIPLINARY-

CiteScore

2.90

自引率

23.10%

发文量

审稿时长

>12 weeks

期刊介绍： Geologia Croatica welcomes original scientific papers dealing with diverse aspects of geology and geological engineering, the history of the Earth, and the physical changes that the Earth has undergone or it is undergoing. The Journal covers a wide spectrum of geology disciplines (palaeontology, stratigraphy, mineralogy, sedimentology, petrology, geochemistry, structural geology, karstology, hydrogeology and engineering geology) including pedogenesis, petroleum geology and environmental geology. Papers especially concerning the Pannonian Basin, Dinarides, the Adriatic/Mediterranean region, as well as notes and reviews interesting to a wider audience (e.g. review papers, book reviews, and notes) are welcome.