浙江梧村超单元主要地质特征及其就位机制探讨

浙江梧村岩体是一个主要由石英二长岩、二长岩组成的中生代复式岩体。通过详细的野外填图和地质地球化学研究,发现该岩体具有结构和成分演化序列。依据侵入体之间及其与围岩的接触关系、岩石的矿物成分及岩石地球化学、结构构造等特征,可将其划分为大山、沐尘、下坞等3个岩石单元,归并为梧村超单元。从早期到晚期,岩浆的侵入具有明显的反序特征,这种"反序"现象是因为存在带状岩浆房。三个单元在格局上呈刺破式同心带状型式,这种就位很可能属于刺穿式底辟作用。

Main Geological Features of the Wucun Super-unit in Zhejiang Province and a Discussion on its Emplacement Mechanism

The Wucun complex in Zhejiang Province is a Mesozoic complex,which is mainly composed of quartz monzonite and monzonite.Detiled field geological mapping and geological-geochemical study show that this complex displays a textural and compositional evolution sequence.According to the contract relation between the intrusive bodies and their wall-rocks,the intrusive rock's mineral and geochemical characters,the rock's texture and structure,the Wucun complex can be divided into three rock units(Dashan,Muchen and Xiawu unit),which are in corporated into a Wucun super-unit.From early to late,the magmatic intrusion shows obvious reversed order,this 'reverse' phenomenon is explained as the result of a zonal magma chamber.The three units take the shape of punctured concentric striatus in their layout,and this kind of emplacement may probably fall into the category of punctured diapir.