Geochemistry and Sr–Nd–Pb isotope characteristics of Miocene basalt–trachyte rock association in transitional zone between the Outer Western Carpathians and Bohemian Massif

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
L. Krmíček, J. Ulrych, Petra Šišková, Simona Krmíčková, P. Spacek, Š. Křížová
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引用次数: 0

Abstract

Representative samples covering all petrographic types of the Miocene subvolcanic (dykes and sills) basalt– trachyte rock association from the Uherský Brod area (UB, Moravia) in the Czech Republic were studied. The UB area is associated with the Klippen Zone in the neighbourhood of the contact of the Carpathian–Pannonian Block with the Bohemian Massif. The petrographic and geochemical features of the subvolcanic rocks from the UB area only partly resemble those of the calc-alkaline rocks in a similar structural position in the coeval Pieniny area in Poland as well as of the transitional calc-alkaline rocks from the Central Slovakian volcanic field. The Miocene subvolcanic rocks were generated by melting of the variably metasomatised sub-lithospheric source and subsequent fractional crystallisation of the primary basaltic magma. The compositional characteristics of this rock series straddle the alkaline and subalkaline volcanic rock fields, while the rocks from the Pieniny area and from the Central Slovakian volcanic field are predominantly calc-alkaline andesites. The distribution of incompatible elements such as U, Th, REE, Nb, Ta, Sr, Ba as well as LaN/YbN ratios and Sr–Nd–Pb isotope composition of the rocks from the UB and Pieniny areas differ substantially, whereas the geochemical patterns of the UB rocks are slightly similar to those of the transitional rocks from the Central Slovakian volcanic field. The modest contents of incompatible trace elements in the andesitic rocks from the Pieniny area share several characteristics of the prevalent calc-alkaline andesitic rocks from the Carpathian–Pannonian region. Basaltic–trachytic series from the UB area are characterised by higher ɛNd (~2.5) and lower 87Sr/86Sr (~0.704) and 207Pb/204Pb (~15.65) initial values in comparison with the calc-alkaline rocks from the Carpathian–Pannonian region including the Pieniny area. Nevertheless, the basaltic–trachytic rocks from the UB, richer in some of the incompatible trace elements (e.g., U, Th, REE, Sr and Ba) partly resemble (including Sr–Nd–Pb isotopes) the Na-alkaline Miocene volcanic rock series of the NE shoulder of the Cheb–Domažlice Graben in the Bohemian Massif.
外西喀尔巴阡山脉与波西米亚地块过渡带中新世玄武岩-粗管岩组合的地球化学和Sr–Nd–Pb同位素特征
研究了捷克共和国UherskýBrod地区(UB,Moravia)中新世次火山岩(岩墙和岩床)玄武岩-粗晶岩组合的所有岩相类型的代表性样品。UB地区与克利彭区有关,克利彭区位于喀尔巴阡山-潘诺尼亚地块与波西米亚地块的接触区附近。UB地区次火山岩的岩相和地球化学特征仅部分类似于波兰同时代Pieniny地区类似结构位置的钙碱性岩石,以及斯洛伐克中部火山场的过渡钙碱性岩石。中新世亚火山岩是由可变交代亚岩石圈源的熔融和随后的原始玄武岩岩浆的部分结晶形成的。该岩石系列的组成特征横跨碱性和亚碱性火山岩区,而Pieniny地区和斯洛伐克中部火山岩区的岩石主要为钙碱性安山岩。UB和Pieniny地区岩石的不相容元素(如U、Th、REE、Nb、Ta、Sr、Ba)的分布以及LaN/YbN比率和Sr–Nd–Pb同位素组成有很大差异,而UB岩石的地球化学模式与斯洛伐克中部火山场过渡岩的地球化学模式略有相似。Pieniny地区的安山岩中不相容微量元素含量适中,与喀尔巴阡山-潘诺尼地区普遍存在的钙碱性安山岩具有一些特征。与喀尔巴阡山-潘诺尼地区(包括皮涅尼地区)的钙碱性岩石相比,UB地区的玄武岩-粗管岩系的特征是较高的Nd(~2.5)、较低的87Sr/86Sr(~0.704)和207Pb/204Pb(~15.65)初始值。然而,UB的玄武岩-粗管岩富含一些不相容的微量元素(如U、Th、REE、Sr和Ba),部分类似于(包括Sr–Nd–Pb同位素)波西米亚地块Cheb–Domažlice地堑NE肩的钠碱性中新世火山岩系。
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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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