摘要
秦岭造山带是我国著名的陆内造山带,也是一个重要的构造-成矿带。本文主要以秦岭地区的内生金属矿床为研究对象,一些重要的外生金属矿床也包括在其中,并按照成矿系列的学术思想将其划分为21个矿床系列。作者在正文中将这些成矿系列按时代顺序排列。对于每一成矿系列形成的构造环境和主要成矿地质作用进行了简要阐述。根据对成矿系列的分析研究,探讨了秦岭地区的区域成矿规律及其与构造演化的相关性。指出长期强烈的构造运动和构造活动随时-空的差异性是导致该区独特成矿特色的主导因素。
Twenty-one metallogenic series of main ore deposits from the Late Archean to the Mesozoic in the Qirtlingarea have been distinguished,comprising one in the Late Archean,four from the Middle to the LataProterozoic,three from the Late Proterozoic to the Lower Paleozoic,three in the Caledonian(including the Late Caledonian-Early Hereyniazn),ono in theHercynian,six in the Meso-zoic and two whose metalIoeserenic epochos are unidentified.Metallogenic pro-cesses of ore-forming elements such as Mo,Au,Ag,Pb,Zn,Hg,Sb,Nb REE and U mostly took placain the area, and there is a wide varioty of genetic types of deposits. Most of the motallogeronic series of deposits are related geneti-cally to magmatic inthesions and eruptions,with early(from the Late Archean to the Lower PaleoZoic)ones to the basic-ultrabasic intrusions and the bimoda-lity pattern marine volca nism resulting from spreading rifting and deep fau-lting and the late(from the Late Paleozolc to the Mesozoic)ones to interme-diate-acid inthesions and terrrstrial volcanisni,generated by conversion of tecto-nic environmenfor frorn ocean to intracontinent. The ore-forming materials worederived mainly from deep-seated soiirces, showing that the tectonomagmaticactivities reached very great depths.There are two important metallotocrenicages: one is the Middle Proterozoic-Early Paleozoic during whtch the metallo-genetic processes wero related to the spreading riftiWor;the other,related to theintracontinental subduction, is the Mesozoic. The Early Proterozoic metallo-genesis was quite weak.The regional metamorphism and high-pressure dynamo-mel:amorphism exerted remarkable effectu on the fozznation of iron, gold, ura-nium, rutile and blue asbestoo oro deposits . Sedimentary metallocroreneses,whichmust have brought about the formation of iron, manganese, lead, zinc andvanadium ore deposito, occurred largely in the Late Alchean, the Paleozoic andthe Mesozoic. There are metalloererenetically marked differences between theeastern Qinling and the western Qinling divided by loWcritude 106°E as aboundary. The disl:ribution of doposits are mostly controlled by the EW-NWWstriking structures, on which the Yanshanian NE-strikincrcr structures woresuperimposed later. Metallocaereneses in the area are characterized by inhorita-nco,polyphases, polysources and polyraereneses. Many times of strong tectonicmovements and their disitinction in time and space played a dominant partin the formation of the unique metallogenic features in the QinliWcr area.
出处
《矿床地质》
CAS
CSCD
北大核心
1994年第4期289-298,共10页
Mineral Deposits
基金
国家自然科学基金
关键词
金属矿床
成矿系列
成矿规律
oro deposit, metallogenic series,regional metallogeny,Qinling area