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《Journal of Jiling University (Earth Science Edition)》 1990-02
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THE TWO DIFFERENT EVOLUTIONAL TRENDS OF SIHETANG GRANITOID COMPLEX, BEIJING

Liu Shuwen  
Sihetang granitoid complex is distributed in west part of Mihuai up-warping region and consists mainly of Zaoshu gneisses, Shicheng gneisses and the gneisso-granodiorites in north part of Yunmeng mountain. The three parts constructing the complex are similar in main mineral and accessory mineral associations and geochemical characters in which biotites or amphiboles are of the same chemical composition. All of these prove they are the crystalized products originated from a comagma in different conditions. The dioritic and qartz-dioritic gneisses-tona litic gneisses-trondhjemitic rocks belonging to Zaoshu and Shicheng gneisses show a tonalite-trondhjemite evolutional trend, and gneissose granodiorites together with the qartz-dioritic gneisses show a cal-alkline trend. The former was formed mainly by enriching plagioclases from fraction of biotites and amphiboles. The later was produced by fractionating a great deal of plagioclases and relatively riching or component in the magma. A synthetical study of whole complex indicates that the original magma of the two trends came from about 25% partial melting of mafic eclogitic and granulitic rocks in deep crust.
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