Episodic Paleoproterozoic (similar to 2.45, similar to 1.95 and similar to 1.85 Ga) mafic magmatism and associated high temperature metamorphism in the Daqingshan area, North China Craton: SHRIMP zircon U-Pb dating and whole-rock geochemistry

作者：Wan, Yusheng^*; Xu, Zhongyuan; Dong, Chunyan; Nutman, Allen; Ma, Mingzhu; Xie, Hangqiang; Liu, Shoujie; Liu, Dunyi; Wang, Huicu; Cu, Hang

来源：Precambrian Research, 2013, 224: 71-93.

DOI：10.1016/j.precamres.2012.09.014

• Mafic magmatism
• Paleoproterozoic
• SHRIMP zircon dating
• Geochemistry
• Daqingshan
• North China Craton

In the Daqingshan area within the Khondalite Belt of the North China Craton, Paleoproterozoic gabbro and dolerite intrusions show amphibolite to granulite-facies metamorphism. U-Pb zircon dating and whole-rock geochemistry were undertaken on these rocks in order to understand the timing of mantle magmatism and thermal processes. Ten samples yielded zircon U-Pb formation ages of 2.46-2.44 Ga, 1.97-1.92 Ga and 1.84 Ga and metamorphic ages of 1.95-1.83 Ga. They are variable in geochemical composition with some being enriched in light rare earth and large ion lithosphere elements but depleted in Nb-Ta. Combined with previous results, it is concluded that mafic magmatism at 2.45-2.37 Ga and 1.97-1.92 Ga indicates two Paleoproterozoic extensional phases, with the latter accompanied by HT-UHT metamorphism as a result of underplating of mantle magma.

• 出版日期2013-1
• 单位天津地质矿产研究所; 中国地质科学院; 吉林大学