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| Tectonic Units and Their Fundamental Characteristics on the Northern Margin of the Alxa Block | |
| 作者单位： | Wu Tairan Geology Department，China University of Geosciences，Beijing and He Guoqi Geology Department，Peking University Jiang Minxi |
| 摘 要： | The northern margin of the Alxa block is the junction of a tectonic units. Four first-order tectonic units are distinguished: 1. the Yagan structural zone characteristic of an immature island arc; 2. the Zhusileng-Hangwula structural zone, which was a passive continental margin in the Early Palaeozoic and was transformed into an active continental margin in the Late Palaeozoic;3. the Shalazha structural zone characteristic of a mature island arc; 4. the Nuru-Langshan structural zone, which was a Proterozoic orogenic belt and later evolved into an extensional transtional crust in the Palaeozoic. The above-mentioned tectonic units differ remarkably in sedimentary formations, magmatic rock associations, metamorphism and geochemistry and are bounded by faults between one another. |
Tectonic Units and Their Fundamental Characteristics on the Northern Margin of the Alxa Block |
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| Wu Tairan Geology Department,China University of Geosciences,Beijing and He Guoqi Geology Department,Peking University Jiang Minxi. Tectonic Units and Their Fundamental Characteristics on the Northern Margin of the Alxa Block[J]. Acta Geologica Sinica (English Edition), 1993, 67(4) | |
| Authors: | Wu Tairan Geology Department China University of Geosciences Beijing He Guoqi Geology Department Peking University Jiang Minxi |
| Abstract: | The northern margin of the Alxa block is the junction of a tectonic units. Four first-order tectonic units are distinguished: 1. the Yagan structural zone characteristic of an immature island arc; 2. the Zhusileng-Hangwula structural zone, which was a passive continental margin in the Early Palaeozoic and was transformed into an active continental margin in the Late Palaeozoic;3. the Shalazha structural zone characteristic of a mature island arc; 4. the Nuru-Langshan structural zone, which was a Proterozoic orogenic belt and later evolved into an extensional transtional crust in the Palaeozoic. The above-mentioned tectonic units differ remarkably in sedimentary formations, magmatic rock associations, metamorphism and geochemistry and are bounded by faults between one another. |
| Keywords: | Alxa structural zone boundary rock association |
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