| 长江中下游成矿带及典型矿集区深部结构探测——SinoProbe-03年度进展综述 |
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| 关键词:Broadband Seismics Reflection Seismics Magnetotelluric Tomography Anisotropy Receiver function Crustal structure |
| 基金项目:“深部矿产资源立体探测技术与试验”(编号: SinoProbe-03); 国家自然科学基金重点基金项目(编号: 40930418) |
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| Probing on Deep Structure of Middle and Lower Reaches of the Yangtze Metallogenic Belt and Typical Ore Concentration Area: A Review of Annual Progress of SinoProbe-03 |
| The present crustal structure and composition are "products" of complex geodynamic processes through geological time, which maintains the relics and fabrics formed during the major geological movement. The image of the “products” based on modern geophysical technology can help not only comprehend the current state of the structure and material, but also deduce the geodynamic events occurred in the geological time. 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. In 2010, a broadband seismic detection about 300km long has been performed in this belt by SinoProbe-03 project, and five seismic reflection, MT and geochemical profiles totally 250km long have been completed over Lujiang-Zongyang ore concentration area. 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. With these discovers, the extensive development of Cretaceous adakite, shoshonite in metallogenic belt and the causes for the formation of the giant Yangtze River metallogenic belt can also be explained. |
| Lü Qing-tian,SHI Da-nian,TANG Jing-tian,WU Ming-an,CHANG Yin-fo,SinoProbe-03-CJ Team.2011.Probing on Deep Structure of Middle and Lower Reaches of the Yangtze Metallogenic Belt and Typical Ore Concentration Area: A Review of Annual Progress of SinoProbe-03[J].Acta Geoscientica Sinica,32(3):257-268. |
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