勉略宁地区新元古代古火山机构与成矿

Neoproterozoic Volcanic Series and Mineralization in Mianluening area

勉略宁地区新元古代所处扬子北缘裂解与汇聚交替发生的构造背景下,广泛、强烈的火山活动、火山喷发-沉积与气液成矿作用,是区内最重要的构造-岩浆-成矿事件,形成了一系列北东(北北东向)展布的古火山机构群与碧口群双峰式火山岩,以及赋存其中的众多VMS型铁、铜、铅锌多金属矿床。研究分析勉略宁地区新元古代古火山机构的空间展布规律,探寻其与多金属矿床的时空耦合关系,揭示这一地区新元古代最重要的构造-岩浆-成矿事件与成矿规律,对于在该地区开展找矿预测(尤其是深部找矿)具有重要指导意义。

Under the tectonic setting of the splitting and convergence of the northern margin of the Yangtze in Neoproterozoic ara,the extensive,concentrated and intense volcanic activities with volcanic eruption-deposition and gas-liquid mineralization,were the most important tectonic magmatic metallogenic event in Mianluening area,which had formed a series of NE-trending bimodal volcanic rocks of the Bikou Group and the Paleovolcanic institutions group,as well as so many VMS iron,copper,lead-zinc polymetallic deposits.Studying and analyzing the spatial distribution of Neoproterozoic paleovolcanic structures and their spatial-temporal coupling with polymetallic deposits,and revealing the most important tectonic-magmatic-metallogenic events and metallogenic regularities of the Neoproterozoic,are of great guiding significance for the development of prospecting and prediction(especially deep prospecting)in this area.