摘要
本文对我国大厂锡石-硫化物多金属矿带进行了较全面的研究。从矿带地质特征、控矿的各种因素和矿床形成的主要规律,提出了本矿带内形成的与燕山期浅成花岗岩有关的锡石-硫化物多金属成矿系列及其成矿模式;总结研究了长坡-铜坑矿床成矿规律和成矿模式;此外,对矿床成因进行了初步的探讨。
The Dachang cassiterite-sulfide-polymetallic belt lies in the Hereynian-Indosinian subsidence adjacent to the margin of the jiangnan massf.The Indosinian and Yenshanian movements caused intensive folding,fracturing and block-fanlting in the subsidence,and granitoids of late Cretaceous age intruded along the basement faults and into the uplifted block of the block-faulting regin.Accompanied by intensive metallization of cassiterite-sulfide-polymetals as well as tungsten and antimony,a metallogenetic series of Sn,Pb,Cu,Sb,As,Hg,and W,related to Yenshanian hypabyssal granites,was formed.The intensity of metallization is consistent with that of the tectonic movement and magmatic activity.The granitic rocks and ore deposits occur mainly in the uplifted blocks.Magmatism,tectonism,and metallization are all characterized by multiple activities.All metallizations were of postmagmatic age and occurred in the vicinity of the center of magmatism and in the structural zones around the granites.More than five successive stages of magmatic activities and two ore-forming phases have been found.Regular ring-like zoning of the ore deposits around the granitic center is noteworthy.A normal zoning of the ore minerals formed during the early phase of metallization,was frequently superimposed by the reverse zoning of the late phase.Favorable loci in the metallogenetic belt for the emplacement of granites and occurrence of mineralization are found at the intersections of the faulted zones,adjacent to the margin of the uplifted areas,and the anticlines.Ore bodies are predominantly localized near the cupolas of the granites which are close to the anticlinal axis and in the fissures and fractures and along the bedding planes of the country rocks.Some are found in the contact zone between granites and wall rocks as well as in the ring-like fractures and fracture zones developed on the flanks of anticlines around the granite mass.The most favorable ore-hosted strata within the anticline are the middle-lower part of Upper Devonian siliceous shale,banded limestone,lense-like limestone and the Middle Devonian reef limestone,which are all characterized by considerable variation in lithology and complexity in texture.A model of metallogenetic belt and metallization for the Changpo-Tongkeng tinpolymetallic deposit is proposed on the geological basis mentioned above.
作者
陈毓川
黄民智
徐珏
艾永德
李祥明
唐绍华
孟令库
Chen Yuchuan;Huang Minzhi;Xu Jue;Ai Yongde;Li Xiangming;Tang Shaohua;Meng Lingku(Institute of Mineral Deposits,Chinese Academy of Geological Sciences)
出处
《地质学报》
1985年第3期228-240,共13页
Acta Geologica Sinica
