大别山北麓上天梯 - 皇城山一带中生代火山岩成矿系列研究

以往对赋存于大别山北坡中生代火山岩中的上天梯非金属矿带和皇城山银矿带分割开来进行地质评价和研究,且厘定出各自的火山岩地层层序。据近年研究成果,上天梯-皇城山一带的火山碎屑岩为同源二次熔结凝灰岩喷发产物,形成于火山柱体喷发塌落机制,乃是相应喷发的不同产物。因而,由火山岩浆活动所形成的金属矿床与非金属矿床不仅与岩相、构造有密切联系,而且与岩浆热液活动机理亦密切相关。本文便是从火山岩喷发相入手,结合火山矿床特征,把与上天梯-皇城山一带中生代火山岩相有关的已知金属、非金属矿床划分为与母山潜火山侵入活动有关、与皇城山浅成火山热液活动有关、和与杨家湾侵出活动有关的三个成矿系列,并对各成矿系列的典型矿床特征进行了详细论述。

Metallogenic Series Related to Mesozoic Volcanic Rocks in Shangtianti-Huangchengshan Area, North Foot of Dabie Mountain

The geological servey on Shangtianti non-metallic and Huangchengshan silver ore deposits related to Mesozoic volcanic rocks of northern Dabie Mountain was separated in the past,and each stratigraphic sequence of volcanic rocks was setted out respectively.According to recent researches,pyroclastic rocks in Shangtianti-Huangchengshan is the eruption product of homologous secondary ignimbrite,formed by eruptions cylinder collapse mechanism.And the pyroclastic rocks are different products of corresponding eruption.Thus,the formation of metal and non-metallic deposits is closely linked not only with the lithofacies and structures,but also closely related to the ore-forming fluid activity mechanism.This paper first deals with the volcanic eruption facies,and then come to geological survey of characteristics of volcanic related deposits,finally the metal and non-metal dposits related to Mesozoic volcanic rocks in Shangtianti-Huangchengshan area is subdivided into three metallogenic series： Mushan subvolcanic intrusive related,Huangchengshan shallow volcanic hydrothermal related,Yangjiawan extrusion related metallogenic series.The above three metallogenic series are discussed in detail on its metallogenic characteristics and typical ore deposits.