Early Carboniferous successive I/S granite magmatism recorded in the Malá Fatra Mountains by LA-ICP-MS zircon dating (Western Carpathians)

IF 1 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Geologica Carpathica Pub Date : 2020-10-26 DOI:10.31577/geolcarp.71.5.1

I. Broska, M. Svojtka

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引用次数: 5

Abstract

In situ U–Pb zircon dating by the ICP-MS technique from tonalite located in the southern margin of the Kriváňska Malá Fatra granite massif records a Concordant age of 353 ± 3 Ma for zircon cores, 342 ± 3 Ma for their rims but the zircons from granodiorite on the northern margin of the massif show only coeval Concordant age of 342 ± 3 Ma from both cores and rims. The obtained ages establish successive Tournaisian and Visean magmatic events in the Variscan Malá Fatra crystalline basement and an intimate relationships between two Early Carboniferous intrusions. The Th/U ratio from zircon cores of Tournaisian tonalite shows a magmatic value of 1.0, whereas the ratio with value of 0.2 from zircon rims most likely represent the thermal imprint from emanated hydrothermal fluids from identified Visean granodiorite intrusion with similar Th/U zircon ratio of 0.4. The short time span of about 11 Ma for the origin of these two granitoid intrusive phases in the Malá Fatra Mountains advocates a relatively rapid Variscan convergence from a probably terminated Tournaisian arc magmatic regime to Visean collisional setting.

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通过LA-ICP-MS锆石测年记录的MaláFatra山脉早石炭世连续I/S花岗岩岩浆作用（西喀尔巴阡山脉）

利用ICP-MS技术对位于Kriváňska mal Fatra花岗岩地块南缘的闪长岩进行原位U-Pb定年，锆石岩心和边缘的年龄分别为353±3 Ma和342±3 Ma，而地块北缘花岗闪长岩的锆石的年龄均为342±3 Ma。所获得的年龄确定了Variscan malfatra结晶基底连续的Tournaisian和Visean岩浆事件，以及两个早石炭世侵入之间的密切关系。图尔纳色闪长岩锆石岩心Th/U比值为1.0，锆石岩心Th/U比值为0.2，表明锆石岩心Th/U比值为0.4的锆石锆石岩心Th/U比值极有可能代表了已识别的维桑花岗闪长岩侵入岩岩浆热液的热印记。马尔法特拉山脉这两个花岗质侵入相的形成时间跨度约为11 Ma，表明从可能终止的图尔纳弧岩浆体系到维西碰撞体系的Variscan辐合过程相对较快。

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来源期刊

Geologica Carpathica 地学-地球科学综合

CiteScore

2.40

自引率

23.10%

发文量

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.