辽宁小东洋河金矿区构造控矿规律的数值模拟

NUMERICAL SIMULATION OF STRUCTURAL CONTROL OF GOLD DEPOSITS IN THE XIAODONGYANGHE AREA OF LIAONING PROVINCE

作者对小东洋河金矿区地质构造进行了研究，采用数值模拟方法给出一种预测隐伏金矿体的新方法。作者在野外详细调查研究同成矿构造体系和主要成矿阶段的基础上，剔除主要成矿阶段以后形成的构造和地质体，以主要成矿阶段及其以前的构造和地质体为依据，建立实验模型，用有限元法模拟该区同成矿构造活动前后应力场和应力降，以同成矿构造应力场中应力集中区与应力降高值区套合部位作为金矿预测靶区，其结果与已知矿点和随后获得的地球化学异常吻合。

his paper studies the geological structure in the Xiaodongyanghe area, Hebei,and proposes a new method for forecasting blind gold ore bodies by means of numerical simulation.On the basis of intensive field work,we distinguished the synmetallogenic structural system and the main metallogenic stages, leaving out the structures and geologic bodies which formed after the main metallogenic stage,and leaving in those formed during and before the main metallogenic stage for establishing the experimental model. The model experiment was conducted using finite element method to study the stress field and the stress drop which occurred before and after the synmellogenic deformation. The stress concentrations overlapping the high stress drops are regarded as forecast gold targets. The target Predicted were foundto well agree with the known ore spots as well as the geochemical anomalies. Altogether ten drill holes and a drift were designed for verification.