| Rb—Sr Geochronology and Magma Source of the Mesozoic Fault—Granite Belt,East Shandong |
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| 引用本文： | 迟效国,林景仟.Rb—Sr Geochronology and Magma Source of the Mesozoic Fault—Granite Belt,East Shandong[J].中国地球化学学报,1993,12(2):118-127. |
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| 作者姓名： | 迟效国 林景仟 |
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| 作者单位： | ChangchunUniversityofEarthScience,Changchun130061 |
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| 摘 要： | Developed in the southeast coast of te East Shandong Peninsula,the Mesozoic fault-magma belt consists of five rock series:the syenite series;the monzonite series;the megaporphyritic monzogranite series;the biotite-granite series;and the alkali granite seres.Based on their Rb-Sr isochron ages(122-220Ma),these rock series may be divided into three magma subcycles dated at Triassic,Late Jurassic and Early Cretaceous.The initial ^87Sr/^86Sr ration in these rock series range from 0.70436 to 0.7155.The starting points of the Rb-Sr isochrons exhibit four different distribution trends on the(^87Sr/^86Sr)i-^87Rb/^86Sr diagram.These characteristics show that the multiple granitic rock series are different in genesis and derivation.The syenite series might be derived from the combination of mantle-derived magma and crustal material,and the others could be derived from granulite-facies and amphibilite-facies rocks in the deep crust.
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| 关 键 词： | 铷－锶 地球年代学 岩浆 山东 铷同位素 花岗岩 岩浆岩 |
Rb-Sr geochronology and magma source of the Mesozoic fault-granite belt,East Shandong |
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| Chi Xiaoguo,Lin Jingqian.Rb-Sr geochronology and magma source of the Mesozoic fault-granite belt,East Shandong[J].Chinese Journal of Geochemistry,1993,12(2):118-127. |
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| Authors: | Chi Xiaoguo Lin Jingqian |
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| Institution: | (1) Changchun University of Earth Science, 130061 Changchun |
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| Abstract: | Developed in the southeast coast of the East Shandong Peninsula, the Mesozoic fault-magma belt consists of five rock series:
the syenite series; the monzonite series; the megaporphyritic monzogranite series; the biotite-granite series; and the alkali
granite series. Based on their Rb-Sr isochron ages (122–220Ma), these rock series may be divided into three magma subcycles
dated at Triassic, Late Jurassic and Early Cretaceous.
The initial87Sr/86Sr ratios in these rock series range from 0.70436 to 0.7155. The starting points of the Rb-Sr isochrons exhibit four different
distribution trends on the (87Sr/86Sr)i-87Rb/86Sr diagram. These characteristics show that the multiple granitic rock series are different in genesis and derivation. The
syenite series might be derived from the combination of mantle-derived magma and crustal material, and the others could be
derived from granulite-facies and amphibolite-facies rocks in the deep crust.
This study was financially supported by the National Natural Science Foundation of China |
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| Keywords: | Rb-Sr geochronology magma source East Shandong |
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