Anisotropic grossular–andradite garnets: Evidence of two stage skarn evolution from Rudnik, Central Serbia

IF 1 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Geologica Carpathica Pub Date : 2021-03-02 DOI:10.31577/GEOLCARP.72.1.2

Bojan Kostić, Danica Srećković-Batoćanin, P. Filipov, P. Tančić, K. Sokol

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引用次数: 2

Abstract

This paper presents LA-ICP-MS data for garnets from the Rudnik skarn deposit (Serbia), which range from Grs45–58Adr40–52Alm2–3 in the core and Adr70–97Grs2–29Sps1 in the rim displaying anisotropy and zoning. In spite of wide compositional variations the garnets near the end-member of andradite (Adr > 90) are generally isotropic. Fe-rich rims exhibit LREE depletion and flat HREE pattern with weak negative Eu anomaly, including higher As and W contents. On the other side, the Fe-poorer core shows flat REE pattern without any significant enrichment or depletion of REE, except higher amounts of trace elements, such as U, Th and Zr. Presence of sulphide minerals indicates reduction conditions and Eu divalent state. Different REE behaviour is conditioned by Eu2+ in reduction conditions. The observed variations in optical features and garnet chemistry are the results of their two-stage evolution. The first stage and period of garnet growth is probably buffered by mineral dissolution and reactions in the country rock. The second stage is related to hydrothermal activity when W and Fe were brought into the system probably by a boiling process in the volcanic event in the late Oligocene 23.9 Ma.

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各向异性毛状-安卓石榴石：塞尔维亚中部Rudnik两阶段矽卡岩演化的证据

本文介绍了Rudnik矽卡岩矿床（塞尔维亚）石榴石的LA-ICP-MS数据，其范围为岩芯中的Grs45–58Adr40–52Alm2–3和边缘中的Adr70–97Grs2–29Sps1，显示出各向异性和分带。尽管成分变化很大，但在安德拉底石（Adr＞90）的端部附近的石榴石通常是各向同性的。富铁边缘表现出LREE贫化和平坦的HREE模式，具有弱的负Eu异常，包括较高的As和W含量。另一方面，除U、Th和Zr等微量元素含量较高外，贫铁岩芯显示出平坦的REE模式，没有任何REE的显著富集或贫化。硫化物矿物的存在表明还原条件和Eu二价状态。在还原条件下，不同的REE行为受到Eu2+的制约。观察到的光学特征和石榴石化学的变化是它们两阶段进化的结果。石榴石生长的第一阶段和时期可能受到乡村岩石中矿物溶解和反应的缓冲。第二阶段与水热活动有关，可能是渐新世晚期23.9 Ma火山活动中的沸腾过程将W和Fe带入系统。

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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.