乌克兰盾区英赫尔巨型岩双长石花岗岩的铀铅年代学研究

IF 0.5 Q4 MINERALOGY
L. Stepanyuk, S. Kurylo, O. Kovtun, T. Dovbush, O. Vysotsky
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引用次数: 1

摘要

在Novooleksandrivka村的地区,Bokovenka河的山谷穿过了Inhulo-Inhulets系列的变质岩带,其中有许多Kirovohrad复杂的小花岗岩体。在新列山里夫卡北部河谷右岸,几乎连续出露斑岩状花岗岩,多为粗粒石榴黑云母花岗岩,由细晶伟晶花岗岩和伟晶花岗岩脉状切割而成。研究了斑岩样花岗岩、不均匀花岗岩的层状体和辉晶-伟晶样花岗岩的脉状体中副独居石的铀铅同位素系统。前两个花岗岩品种为粗粒花岗岩品种,年龄分别为2043.2±2.6万年和2041±230万年。单核细胞明显较年轻,为2030±30万年。在该层序花岗岩中,除了结构和结构特征(总体上表现为粒度减小)外,SiO2含量从73.14下降到70.93%,K2O含量从3.96增加到7.58%(负相关系数为0.98),CaO含量从2.04下降到0.97%,MgO含量从1.14%下降到0.82%。这些变化可能是由原花岗岩熔体的结晶分异引起的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Uranium-Lead Geochronology of Two-Feldspar Granites of the Inhul Megablock (Ukrainian Shield) by Monazite
In the area of the Novooleksandrivka village, the valley of the Bokovenka river crosses a powerful strip of metamorphic rocks of the Inhulo-Inhulets series with numerous small granitoid bodies of the Kirovohrad complex. In the right bank of the river valley north of Novooleksandrivka there are almost continuous rock outcrops of porphyry-like, mostly coarse-grained garnet-biotite granites, which are cut by veins of aplite-pegmatoid and pegmatoid granites. Uranium-lead isotope systems of accessory monazites from porphyry-like granite, layered body of uneven-grained granite and from veined body of aplite-pegmatoid granite have been studied. The age of the first two, more coarse-grained granite varieties, is 2043.2 ± 2.6 and 2041 ± 2.3 million years, respectively. Significantly younger are the monocytes from the vein of aplite-pegmatoid granite - 2030 ± 0.3 million years. In granites in this sequence, in addition to structural and textural characteristics (in general, decrease in grain size), there is a decrease in the amount of SiO2 (from 73.14 to 70.93%) connected with a significant increase in K2O (from 3.96 to 7.58%), (their inverse correlation coefficient is 0.98), a significant decrease in the CaO content from 2.04 to 0.97%, and a slight decrease in the MgO content from 1.14% to 0.82%. These changes are probably caused by the crystallizational differentiation of the original granite melt.
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CiteScore
0.70
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