Phanerozoic magma underplating and crustal growth beneath the North China Craton

Ma Qiang; Xu Yi-Gang; Zheng Jian-Ping; Sun Min; Griffin William L.; Xia Xiaoping; Pan Shao-Kui

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Phanerozoic magma underplating and crustal growth beneath the North China Craton

机译：北中国克拉顿下面的北京岩石岩土展开和地壳增长

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Evidence for post-Archaean crustal growth via magma underplating is largely based on U-Pb dating of zircons from granulite-facies xenoliths. However, whether the young zircons from such xenoliths are genetically related to magma underplating or to anatexis remains controversial. The lower-crustal xenoliths carried by igneous rocks in the Chifeng and Ningcheng (North China Craton) have low SiO2 and high MgO, indicating that parental melts of their protoliths were of unambiguous mantle origin. The xenoliths contain abundant magmatic zircons with late-Palaeozoic ages, and have more radiogenic zircon Hf-isotope compositions and hence younger model ages than ancient crustal magmas and the reworking array of the basement rocks. Our data suggest that the granulites represent episodic magmatic underplating to the lower crust of this craton in Phanerozoic time. Considering the observation that regional lowermost crust (similar to 5km) is mafic and characterized by Phanerozoic zircons, this work reports an example of post-Archaean crustal growth via magma underplating.

机译：后太古代地壳通过岩浆底侵作用增长的证据主要基于麻粒岩相捕虏体锆石的U-Pb年龄。然而，这些捕虏体中的年轻锆石是否与岩浆底侵有关，还是与重熔有关，仍然存在争议。赤峰和宁城（华北克拉通）火成岩携带的下地壳捕虏体具有低SiO2和高MgO，表明其原岩的母熔体具有明确的地幔成因。捕虏体含有丰富的晚古生代岩浆锆石，具有更多的放射成因锆石Hf同位素组成，因此比古地壳岩浆和基底岩石的改造阵列更年轻。我们的数据表明，麻粒岩代表显生宙时期该克拉通下地壳的幕式岩浆底侵。考虑到区域最低地壳（类似于5km）为镁铁质，以显生宙锆石为特征，本研究报告了一个后太古代地壳通过岩浆底侵生长的例子。

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《Terra Nova》 |2017年第4期|共7页
作者
Ma Qiang; Xu Yi-Gang; Zheng Jian-Ping; Sun Min; Griffin William L.; Xia Xiaoping; Pan Shao-Kui;
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作者单位

Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Isotope Geochem Guangzhou Guangdong Peoples R China;

Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Isotope Geochem Guangzhou Guangdong Peoples R China;

China Univ Geosci State Key Lab Geol Proc &

Mineral Resources Sch Earth Sci Wuhan Peoples R China;

Univ Hong Kong Dept Earth Sci Hong Kong Hong Kong Peoples R China;

Macquarie Univ ARC CoE Core Crust Fluid Syst GEMOC Sydney NSW Australia;

Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Isotope Geochem Guangzhou Guangdong Peoples R China;

China Univ Geosci State Key Lab Geol Proc &

Mineral Resources Sch Earth Sci Wuhan Peoples R China;

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正文语种 eng
中图分类天文学、地球科学;
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Phanerozoic magma underplating and crustal growth beneath the North China Craton

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