本文選題：晚古生代　切入點(diǎn)：富林銅礦床　出處：《巖石學(xué)報(bào)》2017年02期

【摘要】：新近發(fā)現(xiàn)的印支期富林矽卡巖銅礦床位于大興安嶺北段新林區(qū)新林鎮(zhèn)東約90km。礦區(qū)發(fā)育與成礦直接相關(guān)的花崗巖和侵入花崗巖中的花崗斑巖,礦體主要賦存于花崗巖與古元古代興安橋組大理巖和早奧陶世黃斑脊山組鈣質(zhì)粉砂巖接觸帶內(nèi)。富林礦床礦化與矽卡巖密切相關(guān),整個(gè)礦化過程可分為兩期:矽卡巖期和石英-硫化物期,5個(gè)階段:早期矽卡巖階段、退化蝕變階段、氧化物階段、早期硫化物階段和晚期硫化物階段,其中銅礦化主要發(fā)生在早期硫化物階段。硫化物主要包括黃銅礦和黃鐵礦,并含少量閃鋅礦、方鉛礦、斑銅礦等。蝕變類型包括石榴子石-透輝石矽卡巖化、陽起石-透閃石矽卡巖化、綠簾石矽卡巖化、綠泥石化、絹云母-粘土化、鉀長石化和局部角巖化。電子探針分析(EMPA)結(jié)果表明:礦區(qū)內(nèi)的石榴子石屬鈣鋁-鈣鐵榴石系列,主要為鈣鐵榴石,輝石為透輝石-鈣鐵輝石系列,以透輝石為主,閃石主要為透閃石、陽起石以及少量鎂綠鈣閃石和鐵淺閃石,簾石為黝簾石-綠簾石系列。黑云母以鎂鐵黑云母和鐵葉云母為主,綠泥石主要為密綠泥石和鐵葉綠泥石,長石以正長石和鈉長石為主。石榴子石成分剖面顯示從核部到邊部,石榴子石呈現(xiàn)出鈣鋁榴石和鈣鐵榴石交替變化的環(huán)帶特征,且Fe~(3+)含量的逐漸升高暗示后期成礦流體氧逸度升高,結(jié)合黑云母Mg-Fe~(3+)-Fe~(2+)圖解,說明富林矽卡巖型銅礦床形成于較強(qiáng)的氧化環(huán)境。鋯石LA-ICP-MS U-Pb測年結(jié)果顯示花崗巖形成于~253Ma,花崗斑巖形成于~244Ma,為大興安嶺地區(qū)一期新的成礦事件。鋯石原位Hf同位素測試結(jié)果表明,花崗巖εHf(t)介于-1.60~2.23,花崗斑巖εHf(t)介于-3.53~1.90,二者均具有古老的兩階段模式年齡,結(jié)合前人對區(qū)域構(gòu)造背景的研究,認(rèn)為富林花崗質(zhì)巖石可能來自于松遼地塊和興安地塊后碰撞背景下俯沖板片斷離軟溜圈上涌導(dǎo)致古老下地殼的部分熔融并卷入少量地幔物質(zhì)而形成的巖漿�；◢彴邘r及與斑巖有關(guān)的脈狀礦化和蝕變的出現(xiàn)暗示富林地區(qū)可能存在印支期的斑巖型礦床,此外結(jié)合石榴子石、輝石成分特征以及輝石Mn/Fe比值與世界矽卡巖礦床對比,指出富林礦區(qū)外圍找礦應(yīng)綜合考慮銅、鉬、鐵、金、鉛、鋅等礦化組合。
[Abstract]:The newly discovered Indosinian Fulin skarn copper deposit is located in the east of Xinlin Town, northern Daxing'anling region. Granite directly related to mineralization and granitic porphyry in intrusive granite are developed in the ore area. The orebodies mainly occur in the contact zone between granite and marble of the Paleoproterozoic Xinganqiao formation and the early Ordovician macular ridge mountain formation calcareous siltstone. The mineralization of the Fulin deposit is closely related to skarn. The whole mineralization process can be divided into two stages: skarn stage and quartz-sulfide stage, five stages: early skarn stage, degenerative alteration stage, oxide stage, early sulphide stage and late sulphide stage. The copper mineralization mainly occurs in the early sulfide stage. The sulphide mainly includes chalcopyrite and pyrite, and contains a small amount of sphalerite, galena, porphyrite, etc. The alteration types include garnet diopside skarnization, The results of electron probe analysis (EMPA) show that the pomegranate in the mining area belongs to the calcium aluminum-calcium iron garnet series. Mainly calcium iron garnet, pyroxene is diopside-calcium ferroxene series, mainly diopside, amphibole is mainly tremolite, actinite and a small amount of magnesium green calcium amphibole and iron amphibole, The biotite is mainly magnesia-ferrite biotite and iron leaf mica, chlorite mainly consists of dense chlorite and iron chlorite, feldspar is mainly orthoclase and albite. The composition profile of pomegranate shows from the core to the edge, Pomegranate shows the annular characteristics of alternate change of calcium aluminite and calcium iron garnet, and the increasing of Fe~(3) content indicates that the oxygen fugacity of ore-forming fluid increases in the later stage, which is combined with the diagram of biotite Mg-Fe~(3. The results of zircon LA-ICP-MS U-Pb dating show that granite formed at 253Maand granitic porphyry formed at 244Ma. it is a new metallogenic event in the Daxinganling area. Zircon in-situ HF isochron occurs in the Daxinganling area. The results of prime test show that, Granite 蔚 Hftbetween -1.60 ~ 2.23 and granitic porphyry between -3.53 ~ 1.90. Both of them have an ancient two-stage model age, which is combined with previous studies of regional tectonic setting, and the results show that: (1) the age of granite is between -1.60 and 2.23, and that of granitic porphyry is between -3.53 and 1.90. It is considered that the Fulin granitic rocks may have originated from the magma formed by the upwelling of subduction plate fragments from the soft slip circle in the post-collision background of the Songliao and Xingan massif, which resulted in partial melting of the ancient lower crust and involvement in a small amount of mantle material. The occurrence of porphyry and porphyry related vein mineralization and alteration suggests that Indosinian porphyry deposits may exist in the Fulin area. In addition, combined with the characteristics of pomegranate, pyroxene composition and the ratio of pyroxene Mn/Fe to the world skarn deposit, it is pointed out that the mineralization combination of copper, molybdenum, iron, gold, lead and zinc should be considered comprehensively in the prospecting of the periphery of Fulin ore area.
【作者單位】： 中國科學(xué)院礦產(chǎn)資源研究重點(diǎn)實(shí)驗(yàn)室中國科學(xué)院地質(zhì)與地球物理研究所;中國科學(xué)院大學(xué);黑龍江有色地質(zhì)七0六隊(duì);
【基金】：國家自然科學(xué)基金重大項(xiàng)目和面上項(xiàng)目(41390444、41272108)資助
【分類號】：P618.41

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