乌克兰盾Osnytsky块闪长岩中钛矿的U-Pb年龄

O. Vysotsky, L. Stepanyuk, T. Dovbush, O. Ziultsle
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摘要

Osnytsky地块是Osnytsky- mikashevytsky火山-深成带的组成部分。Osnytsky地块地质构造的主导地位是岩石组合,该组合包括形成于古元古代- 1998 - 1995 Ga的辉长岩-闪长岩-花岗闪长岩-花岗闪长岩-花岗花岗岩组合的多套辉长岩-白斑花岗岩深成岩。由位于Tomashhorod村西北附近的RPZ-5采石场开采的闪长岩中钛矿的铅-铅同位素定年结果。闪长岩形成于第二阶段,在辉长岩之后,花岗岩类开始形成之前。年龄为1975±9.1 Ma。根据前人资料计算的年龄为1973±8.3 Ma,与闪长岩锆石的U-Pb同位素年龄(1974±1.2 Ma)吻合较好。研究发现,在207Pb/204Pb - 206Pb/204Pb图坐标上,用回归线倾角的相切值计算高普通铅钛矿的同位素年龄,仅用铅的同位素组成就足够了。
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U-Pb age of titanite from diorit of Osnytsky Block (Volyn Megablock of Ukrainian Shield)
The Osnytsky block is a constituent part of the Osnytsky-Mikashevytsky volcano-plutonic belt. The leading place in the geological structure of the Osnytsky block is occupied by the rock association, which includes a number of plutonic formations from gabbro to leucocratic granites (gabbro-diorite-granodiorite-granite association), formed in the Paleoproterozoic — 1,98—1,95 Ga. The results of lead-lead isotope dating of titanites from diorites, opened by the RPZ-5 quarry, located in the northwestern vicinity of the village Tomashhorod. Diorites were formed in the second phase, after gabroids, before the beginning of the formation of granitoids. The age of 1975 ± 9,1 Ma was obtained for them. The age calculated based on previously published data is 1973 ± 8,3 Ma, which is in good agreement with the U-Pb isotopic age of the zircons of these diorites 1974 ± 1,2 Ma. It was found that to determine the isotopic age of titanites with a high content of ordinary lead, it is enough to use only the isotopic composition of lead, calculating the age in the coordinates of the graph 207Pb/204Pb — 206Pb/204Pb, by the tangent of the angle of inclination of the regression line.
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