东篱科研大数据发现系统（DRDS）

位置：成果数据库 > 期刊 > 期刊详情页

Paleoproterozoic mafic dyke from Konsling terrain in the Yangtze Craton and its implication

ISSN号：0379-1726
期刊名称：《地球化学》
时间：0
分类：P597[天文地球—地球化学;天文地球—地质学] P313.2[天文地球—固体地球物理学;天文地球—地球物理学]
作者机构：[1]State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China, [2]State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China
相关基金：Supported by National Natural Science Foundation of China （Grant Nos. 40772042 90714010 and 40521001 ）, the Ministry of Education of China （Grant Nos. 1RT0441 B07039 and NCET-06-0659）, and Foundation of the State Key Laboratory of Conti nental Dynamics, Northwest University

作者： PENG Min[1], WU YuanBao[1,2], WANG Jing[1], JIAO WenFang[1], LIU XiaoChi[1], YANG SaiHong[1]

关键词：扬子克拉通, 镁铁质, 古地形, 岩墙, 加权平均, 同位素组成, 构造意义, 早期演化, Kongling terrain, Paleoproterozoic, mafic dyke, zircon U-Pb age, extensional regime, cratonization

中文摘要：

Mafic 塘是地区性的扩展的一个符号，并且因此有重要构造意义。mafic 女同性恋的大数量发生在 Yangtze Craton 的 Kongling 地面，它有在 Yangtze Craton 的早进化上的大适用。然而，他们的年龄很好没被抑制。在这篇论文，我们在 Kongling 地面为 mafic 女同性恋报导锆石 U-Pb 年龄和 Hf 同位素作文的综合研究。锆石产出加权的吝啬的 ²⁰⁷Pb/²⁰⁶ Pb 1852 ± 1 1Ma 变老，它代表它的侵入年龄。他们有 ɛ _Hf(t)−6.3 珍视到 0.5 与 −3.06 ± 0 .88 的一个加权的平均数，建议 mafic 塘来自交代矿床披风。结果显示扬采·布洛克在 ca 把紧张的政体转变了成 post-collisional 前。1850 妈。在一样的时期， Yangtze Craton 显示足够的刚硬生产易碎的破裂，并且因此有 craton 的特征。

英文摘要：

Mafic dyke is a sign of regional extension, and thus has important tectonic significance. A great amount of mafic dykes occur in the Kongling terrain of the Yangtze Craton, which have great bearing on the early evolution of the Yangtze Craton. Their ages, however, have not been well constrained. In this paper we report an integrated study of zircon U-Pb age and Hf isotope compositions for a mafic dyke in the Kongling terrain. The zircons yielded a weighted mean ^207Pb/^206Pb age of 1852±11Ma, which represents its intrusion age. They have εHf（t） values of -6.3 to 0.5, with a weighted mean of -3.06±0.88, suggesting that the mafic dyke came from metasomatic mantle. The results indicate that the Yangtze Block had transformed into post-collisional extensional regime at ca. 1850 Ma. In the same period, the Yangtze Craton shows enough rigidity to produce brittle rupture, and thus has the characteristics of a craton.