庐-枞金属矿集区深地震反射剖面解释结果——揭露地壳精细结构,追踪成矿深部过程

深地震反射剖面揭示了庐枞矿集区全地壳的精细结构,在研究火山岩盆地的深部构造、探讨成矿深部过程等方面取得了新认识。从长江至大别山下,Moho由30km左右加深至33km左右,罗河矿下方Moho错断大约3km。庐枞火山岩盆地是一个沿着罗河断裂向东发育的"耳状"非对称盆地,并不存在另外一半隐伏在红层之下的盆地。罗河铁矿对应Moho错断处,处在构造的转换带上。罗河断裂之下存在近于透明的弱反射区域,可能是地幔流体和岩浆上涌、喷发的通道。郯庐断裂、罗河-缺口断裂、长江断裂是庐枞地区的三个重要断裂。郯庐断裂带为不对称花束状构造,近于直立,切穿地壳。小岭矿与龙桥矿可能产出在一个隆起的火成岩体的两翼。

A result of interpreting from deep seismic reflection profile:Revealing fine structure of the crust and tracing deep process of the mineralization in Luzong deposit area.

Deep seismic reflection profiles discovered the fine crustal structure of Luzong deposit area, and we obtained new discovery on studying the deep structure of Luzong volcanic basin and tracing deep process of the mineralization. From Yangtze River to Dabie Mountain, Moho goes deeper from about 30km to 33km with 3km offset beneath the Luohe deposit. Luzong volcanic basin is an "ear-like" asymmetric basin of eastward development along the Luohe fault, there is no other half basin buried under the red layer. Luohe ore is corresponding to the offset of Moho and the transition belt of structure. The weak reflection zone in the lower crust of the Luohe may be the surging and eruption channel of magma and mantle fluid. Tanlu fault, Luohe-quekou fault and Changjiang fault are three important faults in the Luzong area. Tanlu behaves a dissymmetrical flower structure, and cut through crust nearly vertically. Xiaoling and Longqiao ores probably located in two flanks of volcanic rock uplift.