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http://www.igeodata.org/handle/20.500.11758/299
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DC 字段 | 值 | 语种 |
---|---|---|
所有者 | Shiwen Xie | - |
所有者 | Hangqiang Xie | - |
所有者 | Shijin Wang | - |
所有者 | Alfred Kröner | - |
所有者 | Shoujie Liu | - |
获取日期 | 2017-03-06T09:13:08Z | - |
获取日期 | 2017-03-06T09:13:08Z | - |
首次发表日期 | 2014-07-05 | - |
引用地址 | http://www.igeodata.org/handle/20.500.11758/299 | - |
摘要 | Eastern Shandong is one ofthe important early Precambrian areas in the North China Craton, where extensive 2.5, 2.7 and 2.9 Ga magmatic activities have been identified, followed by very strong late Neoarchean and Paleoproterozoic tectono-thermal events. We carried out SHRIMP zircon dating, Hf-in-zircon isotope analysis and a whole-rock geochemical study on ca. 2.9 Ga Mesoarchean magmatic rocks. These include gneissic diorite, gneissic quartz diorite, gneissic tonalite and gneissic high-Si trondhjemite and were identified in five new areas. All these rocks contain ca. 2.5 Ga metamorphic zircons. The dioritic and tonalitic rocks are enriched in large ion lithosphile (LIL) elements (K, Rb, Ba) and depleted in Nb and P with moderate to highly fractionated REE patterns, similar in chemical compositions to Archean TTG rocks worldwide. The high-Sitrondhjemites are characterized by very high SiO2 and very low FeOt + MgO. The magmatic zircon grains from all these rocks are similar in their Hf isotopic compositions and have εHf(t) values ranging from +1.3 to +9.9. Combined with previous work, our main conclusions are: (1) eastern Shandong underwent a major magmatic event at ca. 2.9 Ga; (2) diorites and tonalites formed by melting of thickened lower crust or the root of an oceanic plateau, whereas the high-Si trondhjemites were derived from melting of intermediate to felsic rocks; (3) the Mesoarchean (ca. 2.9 Ga) was a major period of juvenile crustal addition from the depleted mantle, earlier than the major crustal growth period at 2.7–2.8 Ga in the North China Craton; (4) the 2.7–2.9 Ga rocks underwent strong metamorphism at ca. 2.5 Ga, probably as a result of magmatic underplating. | zh_CN |
语种 | en | zh_CN |
出版者 | 中国地质科学院地质研究所 Institute of Geology, Chinese Academy of Geological Sciences | zh_CN |
主题关键词 | Mesoarchean ti | zh_CN |
主题关键词 | TTG | zh_CN |
主题关键词 | Juvenile crustal addtion | zh_CN |
成果名称 | Ca. 2.9 Ga granitoid magmatism in eastern Shandong, North China Craton: Zircon dating, Hf-in-zircon isotopic analysis and whole-rock geochemistry | zh_CN |
类型 | Book | zh_CN |
所属集合: | 科技成果 |
文件中的条目:
条目 | 描述 | 大小 | 格式 | |
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Ca. 2.9 Ga granitoid magmatism in eastern Shandong, North China Craton Zircon dating.pdf | 11.6 MB | Adobe PDF |
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