Probing on Deep Structure of Middle and Lower Reaches of the Yangtze Metallogenic Belt and Typical Ore
详细信息
- 责任者：Lü Qingtian (Key Laboratory of Metallogeny and Mineral Assessment ; MLR ; Institute of Mineral Resources ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Shi Danian
- 刊名：Acta Geoscientica Sinica
- 出版年：2011
- 卷期：32(3)
- 关键词：成矿带 ; metallogenic belts ; 地震勘探 ; seismic exploration ; 长江中下游成矿带 ; Metallogenic Belt of Middle and Lower Reaches of Yangtze River
- 页码：p.257-268
- 图表：9 illus., 28 refs.
- 分类号：1600
- issnNo：ISSN1006-3021
- isbnNo：CN11-3474/P
摘要
The middle and lower reaches of Yangtze River metallogenic belt is an important iron, copper and polymetallic base in China, whose deep dynamic processes have constituted the debate focus among researchers. A couple of significant discoveries were made on the basis of preliminary processing and analysis,such as the existence of low-velocity bodies in the upper mantle of the metallogenic belt, short-distance variations of upper mantle anisotropy, local Moho uplift, blur interface between lithosphere and asthenosphere, double-layer crustal structure with thicker upper crust than lower crust. The reflection pattern of crust indicates that it has experienced early compression and later extensional deformation. These discoveries support the dynamic model of asthenosphere uplift, lithospheric thinning, melting of enriched mantle and lower crust thickening and delamination.