| 变密度组合体重力模型及其应用 |
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| 引用本文： | 姜枚,欧阳又康,黎都.变密度组合体重力模型及其应用[J].物探与化探,1986,10(2):81-87. |
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| 作者姓名： | 姜枚 欧阳又康 黎都 |
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| 作者单位： | 中国地质科学院矿床所
(姜枚，欧阳又康)，中国地质科学院矿床所(黎都) |
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| 摘 要： | 为了正确地解释重力资料并取得符合实际情况的结果,需要有新的重力模型,以便改进以往利用的二层模型。根据新近调查的地球物理地质资料,本文提出利用变密度多层结构的地壳重力模型。该模型以较简单的形式反映地壳内各层不同的特征:剖面内横向不均匀性由断块来决定;各层之间不存在明显的密度界面,而是梯度界面。由此,我们推导了截面为不等腰梯形的水平棱柱体的理论公式,编制了相应的程序,并在江西赣州—阳山进行了实际计算。结果与深地震测深的部分资料吻合较好。经验表明,选择初始模型对其效果十分重要。
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GRAVITY MODEL OF COMBINATION BODY WITH VARIABLEDENSITIES AND ITS APPLICATION |
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| Institution: | Institute of Mineral Deposits, Chinese Academy of Ceological Sciences |
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| Abstract: | New gravity model is urgently needed in place of the formerly-used two-layered model to achieve the purpose of interpreting correctly gravity data and obtaining results consistent with the real conditions. Based on the newest information and concept concerning crustal structure acquired through geologic and geophysical investigations, the authors suggest in the paper the application of crustal gravity model with variable density multi-layered structure. This model has the advantage of displaying different charateristics for diverse crustal layers in relatively simple forms. The latitudinal non-uniformity in a profile is determined by block. No apparent density interface exists betweent different layersj instead, there is gradient interface.From these data, the theoretical formula for a horizontal prism with cross section of non-isosceles trapezoid has been deduced with the corresponding pro gram compiled. The results of calculation made along Ganzhou-Yangshan of Jiangxi Province are quite in conformity with part of the data obtained form deep-seated seismic sounding. Practice shows that the choice of initial model is essential for acquiring satisfactory result. |
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