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http://www.igeodata.org/handle/20.500.11758/346
点击复制成果名称: | Middle Neoarchean magmatism in western Shandong, North China Craton: SHRIMP zircon dating and LA-ICP-MS Hf isotope analysis |
作者: | Yusheng Wan Chunyan Dong Shijin Wang Alfred Kröner Hangqiang Xie Mingzhu Ma Hongying Zhou Shiwen Xie Dunyi Liu |
主题关键词: | Neoarchean;Granitoids |
首次发表日期: | 2014-07 |
出版者: | Institute of Geology Chinese Academy of Geological Sciences |
摘要: | Western Shandong Province is a typical area of the North China Craton (NCC) where Neoarchean plu- tonic and supracrustal rocks are widely distributed. Early studies documented that ∼2.7 Ga and ∼2.5 Ga magmato-tectono-thermal events are well developed in the area. Here we report SHRIMP U–Pb ages and Hf-in-zircon isotopic data from ten samples of different magmatic rock types including hornblendite, gneissic tonalite, gneissic trondhjemite and gneissic granite. Magmatic zircon grains have 207 Pb/ 206 Pb ages ranging from 2667 to 2598 Ma. Some rocks contain ∼2.5 Ga metamorphic rims and ∼2.7 Ga zircon cores. The magmatic zircon grains have ε Hf (t) values and Hf crustal model ages of −1.1 to +11.3 and 3.02–2.4 Ga, respectively. Combined with an earlier study, our main conclusions are that the middle Neoarchean rocks mainly occur together with early Neoarchean rocks in the northeastern portion of the central belt. Juvenile additions to continental crust and crustal recycling played important roles in the middle Neoarchean of western Shandong Province, and the entire Neoarchean tectonic evolution can be divided into middle to early Neoarchean (2.75–2.6 Ga) and late Neoarchean (2.6–2.5 Ga) events. |
引用地址: | http://www.igeodata.org/handle/20.500.11758/346 |
所属集合: | 科技成果 |
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Middle Neoarchean magmatism in western Shandong.pdf | 7 MB | Adobe PDF |
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