Please use this identifier to cite or link to this item: http://www.igeodata.org/handle/20.500.11758/335点击复制
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Copyright ownerShiwen Xie-
Copyright ownerHangqiang Xie-
Copyright ownerShijin Wang-
Copyright ownerAlfred Kröner-
Copyright ownerShoujie Liu-
Copyright ownerHongying Zhou-
Copyright ownerMingzhu Ma-
Copyright ownerChunyan Dong-
Copyright ownerDunyi Liu-
Copyright ownerYusheng Wan-
Available Date2017-03-07T03:05:29Z-
Available Date2017-03-07T03:05:29Z-
Date of first publication2014-08-
URIhttp://www.igeodata.org/handle/20.500.11758/335-
AbstractEastern Shandong is one of the important early Precambrian areas in the North China Craton, where exten- sive 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 iso- tope 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-Si trondhjemites are characterized by very high SiO 2 and very low FeOt + MgO. The magmatic zircon grains from all these rocks are similar in their Hf isotopic compositions and have ε Hf (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
Languagezh_CNzh_CN
PublisherInstitute of Geology Chinese Academy of Geological Scienceszh_CN
Professional thesaurusMesoarchean TTG Juvenile crustal addition Eastern Shandong Zircon dating Hf isotopezh_CN
Software brandCa. 2.9 Ga granitoid magmatism in eastern Shandong, North China Craton: Zircon dating, Hf-in-zircon isotopic analysis and whole-rock geochemistryzh_CN
TypeBookzh_CN
Appears in Collections:科技成果

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