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| 1 | Two different mathematical schemes for solving chemical dissolution-front instability problems in fluid-saturated rocks显示文摘Chemical dissolution-front instability(CDFI)problems usually involve multiple temporal and spatial scales,as well as multiple processes.A key issue associated with solving a CDFI problem in a fluid-saturated rock is to mathematically establish a theoretical criterion,which can be used to judge the instability of a chemical dissolution-front(CDF)propagating in the fluidsaturated rock.This theoretical paper deals with how two different mathematical schemes can be used to precisely establish such a theoretical criterion in a purely mathematical manner,rather than in a numerical simulation manner.The main distinguishment between these two different mathematical schemes is that in the first mathematical scheme,a curved surface coordinate system is used,while in the second mathematical scheme,a planar surface coordinate system is employed.In particular,all the key mathematical deduction steps associated with using these two different mathematical schemes are described and discussed in great detail.The main theoretical outcomes of this study have demonstrated that(1)two different mathematical schemes under consideration can produce exactly the same theoretical criterion;(2)the main advantage of using the first mathematical scheme is that the interface conditions at the curved interface between the downstream and upstream regions can be easily described mathematically;(3)the main advantage of using the second mathematical scheme is that the first-order perturbation equations of the CDFI problem can be easily described in a purely mathematical manner. | ZHAO ChongBin HOBBS Bruce ORD Alison | 2022 | Science China(Technological Sciences)2022，65，1： | 1 |
| 2 | 胶东大尹格庄金矿床成矿过程数值模拟及其找矿意义显示文摘大尹格庄金矿床的形成涉及到构造变形、流体活动、热量传递和水岩反应等过程的相互耦合作用。利用FLAC3D数值模拟软件,结合现代矿化率概念,开展了大尹格庄金矿床力—热—流—化耦合的数值模拟,以探讨断裂、体积形变与化学过程耦合对金矿体就位的控制作用。研究结果表明:正体积应变、流体汇聚和金析出量(负矿化率)的高值区均位于控矿招平断裂倾角由陡倾向缓倾转换部位以及断裂局部起伏部位,与金矿体的实际空间分布相吻合,反映出成矿流体更多地汇聚、停留在这些部位,并发生强烈的化学反应,引起金的沉淀析出。这种多物理—化学过程在相同部位的耦合可能是控制大尹格庄金矿床形成的关键因素,基于该成矿规律,推测大尹格庄金矿区深部具有较大的成矿潜力。 | 单文法 毛先成 刘占坤 邓浩 陈进 张维 王海正 杨鑫 | 2023 | 黄金科学技术2023，31，5： | 0 |
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