Phanerozoic magma underplating and crustal growth beneath the North China Craton

被引：17

作者：

Ma, Qiang ^{[1
]}

Xu, Yi-Gang ^{[1
]}

Zheng, Jian-Ping ^{[2
]}

Sun, Min ^{[3
]}

Griffin, William L. ^{[4
]}

Xia, Xiaoping ^{[1
]}

Pan, Shao-Kui ^{[2
]}

机构：

[1] Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Guangdong, Peoples R China

[2] China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Sch Earth Sci, Wuhan, Peoples R China

[3] Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China

[4] Macquarie Univ, ARC CoE Core Crust Fluid Syst GEMOC, Sydney, NSW, Australia

来源：

TERRA NOVA | 2017年 / 29卷 / 04期

基金：

中国国家自然科学基金;

关键词：

MESOZOIC GRANULITE XENOLITHS; SINO-KOREAN CRATON; U-PB ZIRCON; CONTINENTAL-CRUST; ADAKITIC ROCKS; HF ISOTOPES; O ISOTOPES; EVOLUTION; AGES; PETROGENESIS;

D O I：

10.1111/ter.12265

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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.

引用

页码：211 / 217

页数：7

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