Petrogenesis of the Paleoproterozoic Guandishan Granitoids in Shanxi Province: Constraints from Geochemistry and Nd Isotopes |
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作者姓名: | K. H. PARK |
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作者单位: | Department of |
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摘 要: | The Guandishan granitoids consist mainly of various granitoid intrusions with different scales, including the Huijiazhuang intrusion, Shizhuang intrusion and Hengjian intrusion, which were formed between 1906 Ma and 1848 Ma. On the basis of geological and petrological characteristics, these granitoids can be classified into two groups: the earlier gneissic granodiorites and monzogranites, and the later massive leuco-monzogranites. Their geochemical and Nd isotopic features indicate that they could be derived from complicated partial melting of supracrustal rocks with an affinity of continental arc materials, such as sandy shale and pelite, and with garnet, pyroxene, hornblende and plagioclase as residual phases. Biotite, feldspar and other minerals were most likely fractionated during the magma evolution. Their source may have an affinity with continental arcs, and the granitoids could be derived from the main syn-collisional to late-orogenic tectonic environment, which may be related to the final amalgamation between the Eastern and Western continental blocks in the North China Craton.
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关 键 词: | 岩石成因论 花岗岩 地球化学 同位素 |
收稿时间: | 2006-04-26 |
修稿时间: | 2006-08-21 |
Petrogenesis of the Paleoproterozoic Guandishan Granitoids in Shanxi Province:Constraints from Geochemistry and Nd Isotopes |
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Authors: | LIU Chaohui LIU Shuwen LI Qiugen L Yongjun KHPARK YSSONG |
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Institution: | LIU Chaohui,LIU Shuwen,LI Qiugen,L(U) Yongjun,K.H.PARK,Y.S.SONG |
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Abstract: | The Guandishan granitoids consist mainly of various granitoid intrusions with different scales, including the Huijiazhuang intrusion, Shizhuang intrusion and Hengjian intrusion, which were formed between 1906 Ma and 1848 Ma. On the basis of geological and petrological characteristics, these granitoids can be classified into two groups: the earlier gneissic granodiorites and monzogranites, and the later massive leuco-monzogranites. Their geochemical and Nd isotopic features indicate that they could be derived from complicated partial melting of supracrustal rocks with an affinity of continental arc materials, such as sandy shale and pelite, and with garnet, pyroxene, hornblende and plagioclase as residual phases. Biotite, feldspar and other minerals were most likely fractionated during the magma evolution. Their source may have an affinity with continental arcs, and the granitoids could be derived from the main syn-collisional to late-orogenic tectonic environment, which may be related to the final amalgamation between the Eastern and Western continental blocks in the North China Craton. |
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Keywords: | granitoids geochemistry Sm-Nd isotopes petrogenesis Paleoproterozoic Guandishan |
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