| 地学大断面对区域重力资料解释的意义 |
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| 引用本文： | 姜枚,袁学诚.地学大断面对区域重力资料解释的意义[J].物探与化探,1991,15(3):161-167. |
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| 作者姓名： | 姜枚 袁学诚 |
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| 作者单位： | 中国地质科学院
(姜枚)，中国地质勘查技术院(袁学诚) |
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| 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.
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| 关 键 词： | 地学断面 重力资料 解释 |
THE SIGNlFICANCE OP GEOSCIENTIFIC GLOBALTRANSECT IN THE INTERPRETATION OF REGIONALGRAVITY DATA |
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| Institution: | 1. Institute of Mineral Deposits, Chinsse Academy of Geological Sciences;
2. Chinese Academy of Geoexploration |
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| Abstract: | For the purpose of deepening the interpretation of regional gravity datait is necessary to utilize data on the crust and the deeper part provided bydeep seismic sounding. Several geoscientific global transects completed in Chinain the past few years have furnished such possibility. We hold that only onthe basis of the gravity density model which is designed according to thesetransects and agrees with the reality can effective interpretation result beobtained. The conversion of data obtained at a few deep seismic soundingstations into gravity Moho is extremely unreliable, and the metallogenic pro-gnosis made on such a basis will not be correct. The new gravity model shouldinclude multi-layered structure of the crust, faulted block, varying densitycharacter, density ununiformity and not great undulation of Moho as well asthe possibility that fractures are gentle shear zones at depth. The two-layerstructural model neglects these basic characteristics and therefore its interpre-tation has no practical significance. |
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