摘要
利用重力、磁力异常及地质资料讨论了中国古板块划分。用二维和三维方法及各沉积盆地新生代厚度资料计算其重力效应,并从1∶100万布格重力异常中消除其影响,得出深部重力异常。用作者提出的反演三维密度界面的质面系数法,华南地区还用变密度的三维质面系数法反演重力资料得出中国地壳构造图。研究了石油及某些金属矿与地壳构造的关系,得出地幔上隆区与大沉积盆地相对应,为油气田远景区;地幔陡坡带、大重力梯级带、各古板块或块体交界地带,特别是地幔陡坡带、重力梯级带受到不同方向深断裂干扰而发生扭曲地区,对某些金属矿成矿务件尤为有利。指出中国中部地区,即西安—宝鸡—天水—陇西至若尔盖—平武—汉中—安康—西安—带及其所围地区为金、铁、铜、铅锌等金属矿产远景区。
The gravitational effects of low density of Cenozoic basin have been corrected from the 1 : 1 000 000 Bouguer anomaly map. The deep gravity anomalies are obtained. The crustal structure map have shown in fig. 3 by using the 3D mass plane coeffecient method. The paleo plate boundary division of China are discussed. The relationships between the crustal structure, paleo plate or plate, paleorift and the mineral deposits are discussed. The mantle uplift is associated with oil (or gas) fields basin. The mantle slope zone, plate or paleo plate boundary, paleorift are favorable for matallic deposits. Point out that the areas of Xi'an-Baoji - Tianshui - Longxi - Roergai -Hanzhong-Ankang-Xi'an are the prospective regions for Au,Cu,Pb ,Zn,Fe, et al. metallic deposits.
关键词
地球物理
地壳构造
矿产分布
geophysical data, palco plate division, 3-D inversion, deep crustal structure, distribution of mineral deposits
