| 地球化学动力学体系 |
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| 引用本文： | 於崇文.地球化学动力学体系[J].现代地质,1989,3(3):267. |
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| 作者姓名： | 於崇文 |
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| 摘 要： | 本文以地球化学作用与其时-空结构的统一性为指导思想,将地质区域和各种地质体视为动力学体系,应用耗散结构理论,通过对云南个旧钖、多金属成矿区的研究,讨论地球化学动力学体系的建立。 作者应用马尔科夫过程理论揭示了沉积过程的地球化学旋回性,并用动力学体系分析阐明每一旋回的时间结构。花岗岩浆的分离结晶作用与对流驱动的热重力扩散作用相结合导致了岩体内痕量元素的化学分带。岩浆期后体系系由具有非线性动力学机制的复杂的反应-输运网络所构成,其拓朴结构使体系产生异常的动力学行为。通过各种物理化学参数的实验测定建立了成岩、成矿作用的动力学模型,并用计算机模拟了典型矿田内热液流体的流速场与温度场。 地球化学全过程的时间结构可以归结为热力学分枝的分支在时间上的展开或多阶耗散结构的阶梯。地球化学场的空间结构产生于耗散结构的局域化和化学波的成生与传播。成矿区域是囿于有界介质内的局域化耗散结构。不同反应前锋的差速前进从而产生不同物种的分异沉淀使成矿区域出现化学分带。成矿源区起因于某种化学反应核心或特殊的物理边界所产生的局域不均一性。 对地球化学动力学体系作进一步的研究可以揭示金属矿源学、历史地球化学与区域地球化学之间的内在联系。
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| 关 键 词： | 地球化学作用 地球化学过程 地球化学场 时-空结构 地球化学动力学体系 耗散结构 化学波 化学分带 |
GEOCHEMICAL DYNAMIC SYSTEM |
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| Yu Chongwen.GEOCHEMICAL DYNAMIC SYSTEM[J].Geoscience——Journal of Graduate School,China University of Geosciences,1989,3(3):267. |
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| Authors: | Yu Chongwen |
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| Institution: | China University of Ceosciences |
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| Abstract: | The unification, of geochemical processes with their spatip-temporal struc tures is taken as the guiding ideology. Geological areas and geotogical bodies are considered as dynamic systems. Theory of dissipative structures is used to set up a geochemical dynamic system for Gejiu ore region.
The application of the theory of Markov processes reveals the geochemical cyclicity of the sedimentary processes, and dynamic systems analysis is used to make clear the temporal structure of all the cycles. Fractional crystallization of granitic magma accompanied by convection-driven thermogravitational diffusion gives rise to chemical zonation of trace elements.The postmagmatic system is com posed of complex reaction-transport network with nonlinear dynamic mechanisms.
Its topological structure induces exotic dynamic behavior of the system. Dynamic modeling of rock-and ore-forming processes has been established through expe-rimental determination of various physicochemical parameters, field of flow-rates.
of hydrothermal fluids and temperature field have been simulated by computer for a; typical ore field.
The temporal structure of the overall geochemical ocess may be reduced to bifurcations unfolding in time or cascade of multiorder dissipative structures. The spatial structure of, the geochemical field is produced by the localization of dissipative structures and the generation and propagation of chemical waves. Areas of ore formation are localized dissipative structures confined to bounded media. The advancement of different reaction fronts with diverse velocities and thereupon the differential deposition of different-chemical species bring about chemical zonation in the ore region. The source region of ore formation is local inhomogeneities induced by chemical reaction nuclei or peculiar physical boundaries.
Further researches on geochemical dynamic system may reveal the interrela tionship among metallogeny, historical geochemistry and regional geochemistry. |
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| Keywords: | : Geochemical process Geochemical field Spatio-temporal structure Geochemical dynamic system Dissipative structure Chemical wave Chemicalzonation |
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