闪锌矿成矿过程的Fe-Ca-Zn三元耦合系统

项目名称： 闪锌矿成矿过程的Fe-Ca-Zn三元耦合系统

项目编号： No.41272362

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 徐德义

作者单位： 中国地质大学（武汉）

项目金额： 90万元

中文摘要： 前人基于Fe-Zn二元体系建立了闪锌矿成矿过程的反应-扩散、沉淀-结晶-成核等动力学过程。我们近年对其进行了更深入研究，原位测量了手标本切面307个点位23种与成矿有关的元素含量，经由构造的ALCa变换研究发现钙在闪锌矿成矿过程中起着分形反馈作用，这一发现与前期定量模拟的分形振荡及分岔现象相吻合，为建立闪锌矿成矿过程的Fe-Ca-Zn三元耦合系统提供了理论依据，经研究我们猜想H+耗尽时溶解的碳酸盐可能沉淀，系统达到临界状态，出现临界性。故而本项目拟采用复杂性科学研究方法，设计地球化学实验动态模拟闪锌矿的成矿过程，精细观测成矿元素的动态特征，在此基础上，建立由钙参加的闪锌矿成矿的地球化学过程、动力学过程、成核过程，由此构筑三元耦合体系，进而用CNN及DLA建模，验证以上科学猜想，确立三元系统的耦合机制，揭示碳酸钙的溶解和重结晶对容矿空间的限定作用。本研究具有较强的挑战性，可望取得原创性成果。

中文关键词： 耦合动力系统；分形；比对数钙变换；临界状态；元胞非线性网络

英文摘要： The dynamic equations of reaction-diffusion, precipitation -crystallization-nucleation processes for the forming process of sphalerite were built in former researches based on Fe-Zn two components system. In recent several years, we've been carrying forward this work. The contents of 23 elements related to the forming processes of sphalerite on each of 307 points in the intersection of a hand specimen were measured in situ. Through the transformation ALCa we constructed, we found that Ca plays a fractal-feedback role in the forming process of sphalerite. This discovery is in agreement with those phenomena, such as fractal oscillations and bifurcations which we got in former quantitative simulations, and it provides us with a theoretical support for the founding of the Fe-Ca-Zn three conponents coupling system for the forming processes of sphalerite. Through theoretical analysis we guess that the dissoluted calcium carbonate in the solution may deposite when H+ in the solution is exhausted. At this point, the system reaches critical, and criticality may appear. Therefore, in this project, we plan to take the advantage of complexity study method to explore the processses of the forming of sphalerite. Designing geochemical experiments to simulate the processes dynamically, to measure the changing of the contents of

英文关键词： Coupling dynamic system；Fractal；ALCa transformation；Critical status；CNN