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| GEOLOGY OF THE HADAYANG TECTONIC MELANGE IN INNER MONGOLIA:Discovery significance |
| FU Jun-yu, WANG yan, NA Fu-chao, YANG Fan, ZHANG Guang-yu, LIU Yin-cai, KANG Zhuang |
| Shenyang Institute of Geology and Mineral Resources, CGS, Shenyang 110034, China |
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Abstract The Hadayang tectonic melange is outcropped in the Nenjiang-Heihe tectonic belt. According to its regional geological setting and rock geological and geochemical characteristics, the tectonic melange is divided into three parts:matrix, autochthonous blocks and allochthonous blocks. The matrix is dominated by epidote-biotite-chlorite tectonic schist. The autochthonous blocks are composed of epidote-chlorite-biotite tectonic schist and possible conglomerates from outer slope of trench. The allochthonous blocks are mainly hornblendite, hybrid diorite and meta-acidic volcanic rocks. The lithogeochemical characteristics show that the hornblendite and hybrid diorite were formed in a marginal ocean expansion environment related to subduction, while the meta-acidic volcanic rocks have the characteristics of island arc calc-alkaline volcanic rocks. The characteristics above indicate that the Hadayang tectonic melange is related to the subduction-collision of plates. Combined with the feature that glaucophane appears in the Early Carboniferous meta-acidic volcanic rocks of Hongsanliang area and Paleozoic strata outcropped along the Hongsanliang-Hadayang-Yikete area are fault contact relationship between each other, the authors conclude that there is a tectonic melange belt of late Early Carboniferous along this line. The discovery of Hadayang tectonic melange belt is of important significance for understanding the NenjiangHeihe tectonic belt and its structure.
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Received: 09 September 2014
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2015, Vol. 24 
