宽成分谱系岩墙群的岩石成因及其构造与成矿意义
The wide composition spectrum dike swarm (WSDS): Petrogenesis and its tectonic and metallogenic implications
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摘要: 在综述国际上为数不多的宽谱系岩墙群（WSDS）研究实例的基础上，以太行山板内造山带中的岩基后岩墙群为例，详细论证了WSDS的形成机制，并简要讨论其构造与成矿意义。研究认为，①WSDS是一类非常特殊的岩石组合，其岩石组成的多样性主要取决于岩浆起源，因而不同于已知的其他火成岩组合；②WSDS直接的构造指向是造山带岩石圈拆沉作用；③WSDS的产生必须有大规模流体活动的参与，因而是成矿作用的指示器；④岩浆系统是一种复杂性动力系统。在理想系统的框架下，由WSDS识别出的许多成因信息是相矛盾的。但是，在复杂系统的框架下，这些信息可以得到整合解释；⑤板内造山作用是一种特殊类型的造山作用，与板缘构造力没有直接的联系。WSDS同样适用于板内与板缘2种造山类型，具有普适性，都与岩石圈加厚拆沉有关。Abstract: This paper tries to review dike swarms less reported in the world and describe their tectonic and metallogenic implications, defining them as the wide spectrum dike swarms (WSDS). On such a basis, the authors have reached some conclusions:①the WSDS is a specific igneous suite, whose compositional diversity is induced mainly by its origin. Thus the WSDS differs from the other known igneous suites;②the WSDS's direct tectonic meaning is the lithosphere delamination;③Because the producing process of the WSDS needs the active involvement of the deep fluids, the WSDS is the targeting criterion in search for ore deposits;④the magma system is a complex dynamic system. Under the framework of ideal system, many signatures recognized from the WSDS are contradicted. However, these signatures can be integrated under the framework of the complex system;⑤the intraplate orogen is a specific type of orogen. The orogenesis can not be directly related to the tectonic force from the plate boundaries. WSDS applies equally to intraplate orogen and plate boundary orogen.
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