本文選題：銅礦 + 成礦時代�。� 參考：《地質(zhì)學(xué)報》2017年12期

【摘要】：太行山南段井陘-內(nèi)丘一帶是河北省重要的銅礦遠景區(qū),區(qū)內(nèi)成礦條件優(yōu)越。已有研究資料多將該區(qū)銅礦類型、成礦條件等與山西中條山銅礦富集區(qū)進行類比。由于缺少對銅的成礦時代的精確限定,致使無法對區(qū)內(nèi)銅礦床的形成過程及成因進行較為準確的分析,制約著區(qū)域銅礦成因類型對比及找礦勘查工作部署。本文以區(qū)內(nèi)桃園銅礦床及酸棗坪、虎寨口、鹿峪和方垴等四個銅礦化點為研究對象,采用Rb-Sr法測試分析了上述銅礦床及礦化點的礦石硫化物。測試結(jié)果顯示,桃園銅礦不同硫化物對Rb-Sr等時線年齡在1829.6~1840Ma之間,酸棗坪銅礦點的形成時代為1830.7±5.2Ma,虎寨口銅礦點的形成時代為1844.3±5.9Ma。上述三個銅礦床(點)礦石硫化物Rb-Sr等時線年齡測試結(jié)果表明,在古元古代晚期區(qū)內(nèi)有一次較為強烈的銅礦成礦作用,成礦時限在1830~1844Ma之間。而方垴和鹿峪兩個銅礦化點礦石硫化物測年結(jié)果與上述三個銅礦床(點)形成時間有較大差異,Rb-Sr等時線測年結(jié)果分別為1402±23Ma和1376±37Ma,說明在中元古代長城紀末期區(qū)內(nèi)仍有一次銅礦化作用發(fā)生。結(jié)合華北地臺構(gòu)造演化過程,太行山南段古元古代晚期第一次銅礦化與山西中條山胡-篦型銅礦形成時代接近,銅礦床的形成與呂梁運動關(guān)系密切。由于太行山南段銅礦(點)分布區(qū)地處陸內(nèi)構(gòu)造環(huán)境的晉豫裂陷帶,而山西中條山銅礦富集區(qū)處于秦嶺-大別活動帶的北緣的"秦嶺古洋"殼向華北地臺俯沖環(huán)境,構(gòu)造環(huán)境差異可能導(dǎo)致兩區(qū)在銅礦形成潛力及規(guī)模上存在一定差異。與區(qū)內(nèi)第一次銅礦化作用相比,發(fā)生在中元古代長城紀末期的第二期銅礦化在成礦規(guī)模及強度上均較弱,其成礦動力學(xué)機制有待進一步分析確定。
[Abstract]:Jingxing-Neiqiu area in the southern section of Taihang Mountain is an important copper mine area in Hebei Province. Most of the previous studies have compared the copper deposit types and metallogenic conditions with the rich areas of Zhongtiaoshan Copper Mine in Shanxi Province. Due to the lack of precise definition of the metallogenic age of copper, it is impossible to make a more accurate analysis of the formation process and genesis of copper deposits in the region, which restricts the comparison of the genetic types of regional copper deposits and the arrangement of prospecting and exploration. Taking the Taoyuan copper deposit and four copper mineralization sites such as Suanzaoping, Huzhaikou, Luyu and Fangnao as the research objects, the ore sulfides of the above copper deposits and their mineralization sites have been measured and analyzed by Rb-Sr method. The results show that the Rb-Sr isochron age of different sulfides in Taoyuan copper mine is between 1829.6~1840Ma, the age of formation of the site is 1830.7 鹵5.2Maand that of Huzhaikou copper deposit is 1844.3 鹵5.9Ma. The results of Rb-Sr isochron dating of ore sulphide in the three copper deposits (points) indicated that there was a strong mineralization of copper deposits in the late Paleoproterozoic area, and the metallogenic time was between 1830~1844Ma. The results of ore sulphide dating at Fangnao and Luyu copper mineralization sites are quite different from those of the three copper deposits (points) mentioned above. The results of Rb-Sr isochron dating are 1402 鹵23Ma and 1376 鹵37Marespectively, indicating that in the late the Great Wall area of the Mesoproterozoic era, there is still a significant difference between the results of Rb-Sr isochron dating and those of the three copper deposits. There was a copper mineralization. Combined with the tectonic evolution of the North China platform, the first copper mineralization in the late Gu Yuan in the southern Taihang Mountains is close to the formation age of Hu-Be copper deposit in Zhongtiaoshan, Shanxi, and the formation of the copper deposit is closely related to the Lv Liang movement. Because the distribution area of copper deposits (points) in the southern Taihang Mountains is located in the Jinyu rift belt in the continental tectonic environment, and the rich copper deposit area of Zhongtiaoshan Copper Mine in Shanxi Province is located in the "Qinling paleo-oceanic" crust subducting to the North China platform in the northern margin of the Qinling-Dabie active belt, The difference of tectonic environment may lead to some differences in the formation potential and scale of copper deposits between the two regions. Compared with the first copper mineralization in the region, the second stage copper mineralization occurred in the late the Great Wall period of Mesoproterozoic is weaker in the scale and intensity of mineralization, and the dynamic mechanism of mineralization needs further analysis and determination.
【作者單位】： 河北地質(zhì)大學(xué);河北省地礦局探礦技術(shù)研究院;南京大學(xué);
【基金】：河北省國土資源廳基金項目(編號2012055548)和(編號2013045655)聯(lián)合資助的成果
【分類號】：P618.41

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