中国东南部内生成矿区的地球物理特征和深部构造

本文目的是为了有助于讨论中国东南部的地球物理场、深部构造、花岗岩类的成矿专属性及其与内生矿化的关系。应用深地震测深和重力异常建立的地壳与上地幔模型是划分地壳类型和成矿预测的基础。莫霍面深度和地壳不均匀性是划分区域成矿带的主要准则。区域重力异常的模拟和解释肯定了W-Sn成矿与莫霍面坳陷和岩石圈中低密度带的关系,以及Cu—Fe、Pb-Zn成矿带与莫霍面隆起和陡坡带的关系的观点的有效性。还注意到了成矿区与局部重磁异常、侵入体的化学成分、以及不同方向深断裂的关系。根据岩石磁性和岩石化学参数确定了花岗岩类的成矿专属性。应用重力模拟确定了花岗岩类的三维地下形态和内部结构,这有利于提供深部找矿线索和研究侵入体的含矿性。中国东南部获得的资料证明了应用重磁场研究地壳构造、岩浆岩、成矿预测的效果和前景。

GEOPHYSICAL CHARACTERISTICS AND INFRASTRUCTUREOF THE ENDOGENIC METALLOGENIC REGION INSOUTHEASTERN CHINA

It is hoped that this paper will be of some help to the discussion on geo--physical field, infrastructure and metallogenic specialization of granitoids in southeastern China and their connection with endogenic mineralizations.The crust and upper mantle model established by means of deep seismc sounding and gravity anomalies serves as the basis for division of crustal types and metallogenic prognosis, and the Moho depth and the crustal nonniformityseem to be the major criteria for division of regional metallogenic belts. The simulation and interpretation of regional gravity anomalies confirm the existen ce of relationship between W-Sn metallizations and Moho depression and low density zone in lithosphere as well as the relationship between Cu-Fe, Pb-Zn metallogenic belt and Moho uplift and steep slope zone.Due attention is also paid to the relationship of metallogenic provinces to local gravity and magnetic anomalies, chemical composition of intrusive bodies and deep faults in various directions. The metallogenic specialization of the gra nitoids is determined according to magnetism of rocks and petrochemical para meters.With the help of gravity simulation, the three dimensional shape and in terior structure of the granitoids at depth are determined, and this contributes to ore prospecting at depth and the research on ore potentiality of intrusives.The data obtained in southeastern China demonstrate the effectiveness and prospects of applying the gravity and magnetic field to the study of crustal structure, magmatic rocks and ore prognosis.