閃鋅礦鋅同位素和微量元素在巖漿熱液礦床中的初步研究
發(fā)布時(shí)間:2019-03-22 18:54
【摘要】:鋅同位素體系可用于礦床地質(zhì)、海洋生物學(xué)、環(huán)境學(xué)和天體學(xué)等研究方面,顯示了巨大潛力和廣闊的應(yīng)用前景。鋅同位素作為新興方法在熱液系統(tǒng)的礦床形成機(jī)理示蹤等方面具有重要意義。本文首次報(bào)道了大興安嶺中南段拜仁達(dá)壩-維拉斯托礦田和林西邊家大院巖漿熱液礦床不同圍巖中閃鋅礦單礦物的鋅同位素組成、微量元素和稀土元素結(jié)果。取得以下認(rèn)識(shí):(1)拜仁達(dá)壩礦床閃鋅礦δ66Zn值變化范圍+0.20‰~+0.29‰,維拉斯托礦床閃鋅礦δ66Zn值變化范圍+0.23‰~+0.40‰。鋅同位素組成比較獨(dú)特具有明顯的單峰分布模式,這是巖漿熱液型礦床閃鋅礦鋅同位素組成的顯著特征。拜仁達(dá)壩西礦段—東礦段閃鋅礦δ66Zn值逐漸增加趨勢,維拉斯托具有最高的閃鋅礦δ66Zn值。(2)林西邊家大院閃鋅礦δ66Zn值變化范圍+0.23‰~+0.36‰,其鋅同位素組成比較獨(dú)特具有明顯的單峰分布模式,這是巖漿熱液型礦床閃鋅礦鋅同位素組成的顯著特征。林西邊家大院石英斑巖型、隱爆角礫巖型和熱液充填型礦床閃鋅礦的δ66Zn值逐漸增加,同一鉆孔的閃鋅礦從深部到頂部δ66Zn值也逐漸增加。表明林西邊家大院斑巖體向東侵位形成隱爆角礫巖型礦床,隨后含礦熱液流體在遠(yuǎn)離熱液系統(tǒng)中心的東部閃長巖內(nèi)外接觸帶內(nèi)形成熱液礦床。(3)拜仁達(dá)壩-維拉斯托礦床和林西邊家大院礦床閃鋅礦Fe/Mn與δ66Zn值呈明顯的負(fù)相關(guān)趨勢,表明這兩個(gè)礦床的閃鋅礦Fe/Mn與δ66Zn值有類似紅狗礦區(qū)的特點(diǎn),可以用類似機(jī)制解釋,即晚階段沉淀形成低In、Cd閃鋅礦有高的δ66Zn值和低的Fe/Mn比值。但維拉斯托西北部的淺色閃鋅礦具有高的In含量同時(shí)有高的δ66Zn值和低的Fe/Mn比值,推測淺色閃鋅礦來源于In-Zn(Cu)-Pb-Ag礦化作用,形成后受到維拉斯托西北部的W-Sn-In-Bi礦化作用疊加所致。(4)巖漿熱液流體體系鋅同位素也有類似熔體體系穩(wěn)定同位素分餾的溫度效應(yīng)。巖漿熱液礦床鋅同位素組成變化主要與溫度梯度有關(guān)。
[Abstract]:Zinc isotope system can be used in ore deposit geology, marine biology, environmental science and astrology, etc., showing great potential and wide application prospect. As a new method, zinc isotope plays an important role in tracing the mechanism of deposit formation in hydrothermal system. This paper reports for the first time the zinc isotopic composition, trace elements and rare earth elements of single minerals of sphalerite in different surrounding rocks of Bayern Daba-Verasto ore field and Linxi Banyuan magmatic hydrothermal deposit in the middle and south part of Daxinganling Mountains. The main results are as follows: (1) the range of 未 66Zn values of sphalerite ranges from 0.20 鈥,
本文編號(hào):2445830
[Abstract]:Zinc isotope system can be used in ore deposit geology, marine biology, environmental science and astrology, etc., showing great potential and wide application prospect. As a new method, zinc isotope plays an important role in tracing the mechanism of deposit formation in hydrothermal system. This paper reports for the first time the zinc isotopic composition, trace elements and rare earth elements of single minerals of sphalerite in different surrounding rocks of Bayern Daba-Verasto ore field and Linxi Banyuan magmatic hydrothermal deposit in the middle and south part of Daxinganling Mountains. The main results are as follows: (1) the range of 未 66Zn values of sphalerite ranges from 0.20 鈥,
本文編號(hào):2445830
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