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韧性剪切带活动时限 (持续的时间 )的研究 ,可以为相关地质事件提供重要的制约条件。由于直接测定韧性构造事件的时限尚没有一种成熟的方法 ,本文试图依据韧性剪切带中构造岩及其应力矿物所反映的物理化学信息 ,以求得时限。现主要讨论构造应变速率法 ,具体的方法和步骤 :首先 ,通过计算差异应力求得流变速率 ;其次 ,通过计算体积因子来求算有限应变 ;第三 ,应用有限应变量与流变速率来求得地质事件的过程时间。并以宿松韧性剪切带型磷矿为例 ,获得韧性剪切带形成的时限为 10 0± 10万年。
Studies of the time-duration (duration) of ductile shear zones can provide important constraints on the associated geological events. Since there is no mature method to directly determine the timing of ductile tectonic events, this paper tries to find the time limit based on the physicochemical information reflected by tectonic rocks and their stress minerals in the ductile shear zone. Now, we mainly discuss the method of tectonic strain rate, specific methods and steps: firstly, calculate the rheological rate by calculating the differential stress; secondly, calculate the finite strain by calculating the volume factor; third, by applying the finite strain and the rheological rate Determine the geological event of the process time. Taking the Susong ductile shear zone phosphate rock as an example, the time limit for the formation of ductile shear zone is 10 ± 10 million years.