劉賢紅1, 2<
(1. 中南大學(xué) 有色金屬成礦預(yù)測(cè)教育部重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083，
2. 中南大學(xué) 地球科學(xué)與信息物理學(xué)院，長(zhǎng)沙 410083；3. 山東招金集團(tuán)，招遠(yuǎn) 265400)
摘 要: 大尹格莊金礦床位于招平斷裂帶中段，金礦體主要賦存于招平斷裂主裂面下盤的黃鐵絹英巖化碎裂巖和黃鐵絹英巖化花崗巖中。巖、礦石主成分分析顯示：膠東群變質(zhì)巖與煌斑巖成分均與玄武巖的相似，大尹格莊礦區(qū)煌斑巖與焦家礦區(qū)和玲瓏礦區(qū)煌斑巖在化學(xué)成分上差異明顯。絹英巖化蝕變過程中，顯著帶入Si和K，而Na、Ca和Mg等組分帶出明顯。稀土元素分析顯示：黃鐵絹英巖化蝕變和金成礦過程中顯著帶出稀土元素，膠東群變質(zhì)巖的原巖與拉斑玄武巖有關(guān)，而煌斑巖及其他樣品的初始物源又與膠東群變質(zhì)巖有關(guān)。微量元素分析顯示：Au、Ag、Cu、Pb、As、Mo、Bi、Rb和Sr等元素在金礦體及黃鐵絹英巖化蝕變巖中呈聚集趨勢(shì)，但Au元素的聚集與Cu、As、Pb、Zn、Hg和Ag等元素的聚集不同步。大尹格莊金礦的形成與燕山期構(gòu)造運(yùn)動(dòng)和巖漿活動(dòng)關(guān)系密切，并受到斷裂構(gòu)造系統(tǒng)、膠東群變質(zhì)巖、玲瓏花崗巖及伴生巖脈等條件的復(fù)合制約，長(zhǎng)期大規(guī)模熱液對(duì)流循環(huán)及所伴隨的動(dòng)態(tài)開放條件下的水巖反應(yīng)和物質(zhì)運(yùn)動(dòng)是大尹格莊金礦成礦的關(guān)鍵。
關(guān)鍵字: 巖石化學(xué)；水巖反應(yīng)；成礦作用；大尹格莊金礦；膠西北
Dayingezhuang gold deposit, northwest Jiaodong peninsula
CHEN Yan1, 2
（1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education,
Central South University, Changsha 410083, China
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
3. Shandong Zhaojin Group Corporation, Zhaoyuan 265400, China）
Abstract:The Dayingezhuang gold deposit was located in the middle part of Zhaoping fault zone. The main orebodies occurred in cataclasite and granite with beresitization alteration in the fault’s footwall. The principal component analysis of the rocks shows that the compositions of Jiaodong Group metamorphic rocks and lamprophyres are similar with those of basalts; the chemical compositions of lamprophyres in Dayingezhuang diggings are different from those in Jiaojia and Linglong diggings. In the process of sericitization, Si and K are carried in significantly; Na, Ca and Mg are brought out obviously. The analysis of rare earth elements shows that rare earth elements are brought out obviously in the process of beresitization and mineralization. The virgin rocks of Jiaodong group metamorphic rocks are connected with tholeiite. The original source of lamprophyres and other rock samples are related to Jiaodong group metamorphic rocks. The analysis of trace elements shows the collective trend of Au, Ag, Cu, Pb, As, Mo, Bi, Rb, Sr etc in ores and beresitization alterated rocks, but the aggregation of Au is out of sync with that of Cu, As, Pb, Zn, Hg, Ag and so on. The formation of Dayingezhuang gold deposit has close relation with tectonic movement and magmatism in Yanshanian period and is restricted by the fracture structure system, Jiaodong group metamorphic rocks, Linglong granite and concomitant dikes. Long-term and large-scale convective circulation of hydrothermal solution and concomitant water-rock reactions and motion of matter in the dynamic-open condition are the keys of the mineralization in Dayingezhuang gold deposit.
Key words: petrochemistry; water-rock reaction; mineralization; Dayingezhuang gold deposit; northwest Jiaodong peninsula
