引用本文：金松.2020.内蒙古杜尔基构造混杂岩物质组成及构造属性研究[J].地质学报,94(8):2227-2242. JIN Song.2020.Study of material composition and tectonic properties of the Duerji tectonic melange, Inner Mongolia[J].Acta Geologica Sinica,94(8):2227-2242.
Abstract:The Duerji tectonic melange is composed of “matrix” and “blocks”. Based on petrological and geochemical studies, the “matrix” is considered to be a set of marine debris rocks formed in the tectonic environment of active continental margins. The “blocks” include pyroxene amphibolite, amphibolite, basalt, diabase, diorite. Basalt and diabase are Na- rich and K- poor rock system with low Ti, high Mg and Al. They have the dual tectonic properties of MORB and IAT, and are allochthonous blocks that formed in the tectonic forearc when the ocean began to initially subduct. Diorite is the Mg diorite (MA) which has the characteristic of SiO2 (53. 41%), MgO (5. 57%), Mg＃ (51), FeO/MgO (1. 08). Compared with basalt and anthracite, diorite has the characteristic of high Ti, Ta and low Nb, and is an autochthonous block formed in the tectonic environment of active continental margins with subduction. The conclusion of the study on the material composition and tectonic properties of the Duerji tectonic melange is that it may reflect the process of late Carboniferous Ocean Subduction- Early Permian Ocean Land Subduction- MiddlePermianoceanBasin Closing.