亚速地区(乌克兰盾)多布罗比尔地块花岗岩年代学

IF 0.5 Q4 MINERALOGY Mineralogical Journal-Ukraine Pub Date : 2022-01-01 DOI:10.15407/mineraljournal.44.04.094
L. Stepanyuk, O. Bobrov, T.B. Yaskevich, V.O. Shpylchak
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引用次数: 1

摘要

多布罗比尔花岗岩块体发育于亚速地区古利亚比尔和雷米夫地块的交界处。岩体中的花岗岩类侵入科西夫采夫绿岩构造。该地块由相当广泛的岩石组成(石英闪长岩、花岗闪长岩、石英二长岩、二长闪长岩、闪长岩、斜长花岗岩和花岗岩)。该地块的花岗岩类的一个特征是在其中存在不同数量的不同组成的岩石小捕虏体(角闪岩/变质辉长岩、角闪岩、石英闪长岩和正常系列的花岗岩类)。根据地质资料,该地块的形成分为两个阶段,对应于花岗岩类的两个相应阶段的形成。本文介绍了用SHRIMP-II离子探针对该地块侵入岩二期调性岩中各代伴生锆石进行铀铅定年的结果。结果表明,锆石晶体由三代组成。第一代锆石以岩浆成因锆石生长的非均质岩心为代表,即第二代。第三种锆石在前两种锆石上形成较薄的壳层,其结晶是岩浆期后钾化作用的结果,极有可能发生在硅酸盐熔体演化的气石阶段。根据铀铅离子测年结果发现,第一代锆石的数值年龄(按207Pb/206Pb比值计算)范围较广,在36 ~ 28亿年之间。根据对薄带壳(第二代锆石)和第三代锆石壳的分析资料,确定了康科迪亚与非康科迪亚上部交点的年龄为2078±2000万年前,与侵入岩第二期tone - alites形成的时间相对应。
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GEOCHRONOLOGY OF GRANITOIDS OF THE DOBROPIL MASSIF OF THE AZOV REGION (UKRAINIAN SHIELD)
The Dobropil granitoid massif is confined to the junction of the Gulyaipil and Remiv blocks of the Azov region. The granitoids of the massif intrude the Kosivtsiv greenstone structure. The massif is represented by a fairly wide range of rocks connected by gradual transitions (quartz diorites, granodiorites, quartz monzonites, monzo-diorites, tonalites, plagiogranites and granites). A characteristic feature of the granitoids of the massif is the presence in them of various amounts of small xenoliths of rocks of different composition (amphibololites/metapyroxenites, amphibolites, quartz diorites and granitoids of the normal series). According to geological data, the formation of the massif took place in two stages, which correspond to the formation of two corresponding phases of granitoids. The article presents the results of uranium-lead dating of various generations of accessory zircon from tonalites of the second phase of the massif intrusion using the SHRIMP-II ion-ion microprobe. It is shown that zircon crystals are composed of three generations. Zircon of the first generation is represented by heterogeneous cores on which magmatogenic zircon actually grows — the second generation. Zircon of the third forms rather thin shells on the first two, its crystallization is due to the processes of post-magmatic kalishpatization, which took place, most likely, at the pneumatolite stage of the evolution of the silicate melt. According to the results of uranium-lead ion-ion dating, it was found that among the zircon of the first generation, a fairly wide range of numerical age values (according to the 207Pb/206Pb ratio) is noted, from 3.6 to 2.8 billion years. The age of 2078 ± 20 million years ago was obtained for the upper intersection of the concordia with the discordia, constructed on the basis of analytical data obtained for thin-zoned shells (zircon of the 2nd generation) and zircon shells of the third generation, which corresponds to the time of rooting of the tonalites of the second phase of the intrusion.
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18
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CURRENT STATE’S CONDITION OF LITHIUM ORE DEPOSITS IN UKRAINE A COMPARATIVE ANALYSIS OF DIAMONDS IN NON-KIMBERLITIC ROCKS OF THE WORLD AND NEOGENE SANDS OF UKRAINE GEOCHEMICAL CHARACTERISTICS OF THE SALTYCHIAN GRANITES (WESTERN AZOV AREA) ACCORDING TO THE ICP-MS RESEARCH RESULTS ECOLOGICAL AND GEOCHEMICAL FEATURES OF MANGANESE DISTRIBUTION IN GROUNDWATERS OF UKRAINE PUMPELLYITE FROM METABASALTS OF THE UKRAINIAN CARPATHIANS
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