TIMING OF LOWER CRUST GENERATION IN THE VOYKAR OPHIOLITE MASSIF, POLAR URALS, RUSSIA: U-Pb (LA-ICP-MS) DATA FROM PLAGIOGRANITE ZIRCONS

IF 1.2 4区地球科学 Q2 GEOLOGY

Ofioliti Pub Date : 2016-12-22 DOI:10.4454/OFIOLITI.V41I2.443

G. Queiroga, Maximiliano D. Martins, N. Kuznetsov, F. Chemale, I. Dussin, A. Pedrosa-Soares, K. Kulikova, M. P. Castro

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引用次数: 3

Abstract

The Uralide Orogen is one of the main Paleozoic belts formed during the assembly of Pangea. The present-day Urals (Uralian Mountains, N-S-trending through northern Eurasia) expose the relics of this Paleozoic orogen. The Voykar Massif, located at the Polar Urals, is an ophiolite assemblage composed mainly of mantle tectonite, gabbroic to ultramafic plutonic sequence and sheeted dikes with a MORB-type source. Geochronological data for this region show a wide range of ages and are mainly based on U-Pb zircon data, although some Rb-Sr and Sm-Nd are available. We present high-resolution U-Pb (LA-ICP-MS) analyses performed on zircon crystals extracted from a plagiogranite vein associated with a porphyritic dolerite dike. Magmatic zircon grains yielded a U-Pb age of 428.1±7.4 Ma, corresponding to the Wenlock Period (middle Silurian). This age suggests a late stage of oceanic crust generation in the Voykar basin. Different ages from plagiogranite and gabbroic bodies suggest that oceanic spreading lasted from ca. 490 to 425 Ma, i.e., at least 65 Ma or even longer, in the Voykar basin.

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俄罗斯极地乌拉尔沃伊卡蛇绿岩地块下地壳生成时间:斜花岗锆石U-Pb (LA-ICP-MS)数据

乌拉里德造山带是盘古大陆组装时期形成的古生代主要造山带之一。今天的乌拉尔山脉(乌拉利山脉，向北-南穿过欧亚大陆北部)暴露了这个古生代造山带的遗迹。沃伊卡尔地块位于极地乌拉尔山脉，是一个以地幔构造岩、辉长岩-超基性深成矿层序和片状脉为主的蛇绿岩组合，源区为morb型。该地区的年代学资料年龄范围广，主要以U-Pb锆石资料为主，但也有一些Rb-Sr和Sm-Nd资料。我们提出了高分辨率的U-Pb (LA-ICP-MS)分析从与斑岩白云岩脉相关的斜花岗岩脉中提取的锆石晶体。岩浆锆石U-Pb年龄为428.1±7.4 Ma，对应于文洛期(志留统中)。这一年龄表明沃卡尔盆地洋壳形成的晚期。斜长花岗岩和辉长岩的不同年龄表明，沃卡尔盆地的海洋扩张持续了约490 ~ 425 Ma，即至少65 Ma或更长时间。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ofioliti 地学-地质学

CiteScore

2.40

自引率

7.70%

发文量

期刊介绍： Since 1976, Ofioliti provides an international forum for original contributions and reviews in the field of the geodynamics, petrology, geochemistry, biostratigraphy, stratigraphy, tectonics and paleogeography applied to ophiolitic terrains and modern oceanic lithosphere, including their sedimentary cover. Studies of topics such as geodynamics of the mantle, the evolution of orogens including ophiolites and paleoceanography are also welcome