摘要
为了深化区域重力资料的解释，需要充分利用深地震测深等方法所提供的地壳及其深部资料。近几年我国完成的若干条地学大断面提供了这种可能。我们认为依据它为基础设计的较符合实际情况的重力密度模型，才会得到较为有效的解释结果；如果仅使用少量深地震测深点的资料去换算重力莫霍面是极不可靠的，由此作出的成矿预测也是不会正确的。新的重力模型应该包括地壳的多层结构、断块构造、变密度特征、莫霍面密度不均匀性和起伏不大、断裂产状在深部可能是平缓的剪切带等。而两层结构模型忽视了这些基本特征，解释结果没有实际意义。
:
For the purpose of deepening the interpretation of regional gravity data
it is necessary to utilize data on the crust and the deeper part provided by
deep seismic sounding. Several geoscientific global transects completed in China
in the past few years have furnished such possibility. We hold that only on
the basis of the gravity density model which is designed according to these
transects and agrees with the reality can effective interpretation result be
obtained. The conversion of data obtained at a few deep seismic sounding
stations into gravity Moho is extremely unreliable, and the metallogenic pro-
gnosis made on such a basis will not be correct. The new gravity model should
include multi-layered structure of the crust, faulted block, varying density
character, density ununiformity and not great undulation of Moho as well as
the possibility that fractures are gentle shear zones at depth. The two-layer
structural model neglects these basic characteristics and therefore its interpre-
tation has no practical significance.
出处
《物探与化探》
CAS
CSCD
1991年第3期161-167,共7页
Geophysical and Geochemical Exploration
