MVT型矿床中闪锌矿结晶的Liesegang环带模拟

Simulation of Liesegang Band in Sphalerite in MVT Deposits

在六方晶系方解石被闪锌矿所交代的假设基础上,用反应扩散方程建立了六方晶系CNN动力学模拟系统,模拟了闪锌矿的Liesegang环带结构和矿物晶体中结晶颗粒半径分布.结果表明随着交代作用自外向内的减弱,闪锌矿矿化强度逐渐减弱,闪锌矿Fe/Zn比呈振荡变化形成Liesegang环带结构,并且闪锌矿结晶颗粒半径逐渐减小,最大结晶颗粒半径与边界的距离服从幂律分布(分形).

Based on a new hypothesis that sphalerites are formed in replacement of hexagonal calcites in Mississippi Valley-type （MVT） deposits, a new cellular nonlinear network （CNN） model is proposed in a hexagonal coordinate system. The simulated results show that the sphalerites formed have Liesegang band textures and the radii of the crystallites oscillating decreases from the rim of the calcite crystal inward. It also shows that the radii of sphalerites decreases from the rim in conformity with the power-law distribution.