玲珑花岗质杂岩的时代、空间形态、源岩及其数学模拟

Ages, Spatial Forms, Source Rocks and Mathematical Modeling of Linglong Granitic Complex

玲珑花岗质杂岩体是一个具有长期演化历史，多次改造重熔的复式岩体，与金矿化有关的郭家店型、郭家岭型岩体分别定位于燕山早期及燕山晚期。通过１６条重磁剖面反演获知，玲珑花岗质杂岩体是一个以郭家店为重熔中心，向北呈低角度超覆，向南与围岩呈高角度接触的箕状岩体，８６％以上的金矿赋存在岩体厚度小于４ｋｍ的区域中。玲珑花岗质杂岩体不同部位其源岩组成不同。依据岩体空间形态、源岩和区域构造格架，划分３个具有不同成岩、成矿特征的岩区。玲珑花岗质杂岩形成过程的数学模拟，揭示出在重熔过程中，金在流体相中的富集及嗣后在热驱动下的流体循环。

Linglong granitic complex is a compound rock body characterized by long evolutionary history and multiple reformation and remelting, with Guojiadian type and Guojialing type rock bodies being of Early Yanshanian and Late Yanshanian respectively. Inversion of 16 gravity and magnetic profiles shows that Linglong granitic complex is a rock body in the form of winnowing pan, with Guojiadian as the remelting center. It assumes low angle overlap northward and high angle contact with wall rocks southward, and over 86% gold deposits occur in places with the rock body thickness less than 4km. Different positions of Linglong granitic complex have different source rock compositions. According to spatial forms, source rocks and tectonic frameworks of the rock body, the Linglong granitic complex was divided into different rock areas with different rock forming and ore forming characteristics. The mathematic modeling of the formation of Linglong granitic complex revealed that in the remelting process, the enrichment of gold in fluid facies and the circulation of fluids driven by heat of the rock body constituted the basic factors responsible for the development of gold mineralization.