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首页> 外文期刊>Gondwana research: international geoscience journal >Xenocrystic/inherited Precambrian zircons entrained within igneous rocks from eastern South China: Tracking unexposed ancient crust and implications for late Paleoproterozoic orogenesis
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Xenocrystic/inherited Precambrian zircons entrained within igneous rocks from eastern South China: Tracking unexposed ancient crust and implications for late Paleoproterozoic orogenesis

机译：来自华南华南地区的XenoCrystic / Inherited Pregambrian Zircons夹带的火成岩：跟踪未暴露的古地壳和对晚古普罗佐的影响

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摘要

South China is characterized by widespread igneous rocks with varied ages and nature in its eastern part, which contain abundant Precambrian xenocrystic/inherited zircons that bear important information of the composition and evolution of the underlying ancient crust. This paper for the first time presents a compiled U-Pb age database of 1416 Precambrian xenoaystic/inherited zircons from igneous rocks in eastern South China, and attempts to provide a constraint on the Precambrian crustal evolution of the constituent Yangtze and Cathaysia blocks. These xenocrystic/inherited zircons, as a conceivable proxy of the unexposed continental crust, document three major tectonothermal events related to continental accretion and subsequent modification that possibly built the continental crust of the eastern Yangtze Block (EYB) at 2.70-2.40 Ga, 2.10-1.55 Ga, and 0.95-0.70 Ga, and the Cathaysia Block (CAB) at 2.70-2.40 Ga, 2.05-1.75 Ga, and 1.10-0.70 Ga, pointing to a complex Precambrian evolutionary history for South China. The EYB zircons are unexpectedly dominated by a 2.10-1.55 Ga age population that shows a multimodal distribution with peaks at 2.05 Ga, 2.0 Ga, 1.90 Ga, 1.85 Ga, and 1.58 Ga, and the CAB zircons are characterized by a unimodal 2.0-1.75 Ga age population that conspicuously peaked at 1.85 Ga, both of which overlap with the tenure of the Nuna supercontinent. These xenocrystic/inherited zircons from both blocks generally have negative epsilon(Hf)(t) values, which in combination with coeval regional magmatic and metamorphic records can assist to trace a possible prolonged (2.05-1.75 Ga) orogenic process in the EYB and a short-lived (1.9-1.8 Ga) orogeny in the CAB. Such orogeneses are proposed to be correlated with the assembly of the Nuna supercontinent. (C) 2020 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
机译：华南地区的特点是普遍的火焰岩石，其东部含有各种各样的年龄和性质，其中包含丰富的突袭宣传/继承的锆石，这些锆石具有重要信息的基础古代地壳的构图和演变。本文首次提出了一份编译的U-PB年龄数据库1416英国先兆Xenoaystic /继承的Zircons，来自东南部的火岩，并试图为成分长江和国泰群体的前皮里亚姆地壳演变提供约束。这些XenoCrystic /继承的锆石，作为未经曝光的大陆地壳的可想象的代理，文件与大陆累积和随后的修改有关的三个主要构成热门事件，并在2.70-2.40 GA，2.10- 1.55 GA和0.95-0.70 GA，以及2.70-2.40 GA，2.05-1.75 GA和1.10-0.70 GA，1.10-0.70 GA，指向华南地区的复杂锋利山脉进化历史。 EyB氧化股意外地由2.10-1.55年龄的年龄群体主导，该群体显示了2.05Ga，2.0Ga，1.90 Ga，1.85 Ga和1.58Ga，1.85 Ga和1.58Ga的峰值的多模峰分布，并且驾驶室锆石是一个单峰的2.0-1.75 GA年龄人口，明显达到1.85克，两者都与NUNA超大镇定的任期重叠。来自两个嵌段的这些Xe​​noCrystic /遗传氧化锆通常具有负ε（HF）（T）值，其与氏族区域岩石和变质记录组合可以有助于在EYB和A中追踪可能的延长（2.05-1.75AG）orenogeric过程驾驶室短暂（1.9-1.8 GA）Orogeny。提出这种orgogeneses与NUNA超镇部的组装相关。 （c）2020国际Gondwana研究协会。 elsevier b.v出版。保留所有权利。

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