本文關(guān)鍵詞： 巖漿活動(dòng) 成礦作用 俯沖 碰撞 V 拉勒 巖石學(xué)　出處：《地球科學(xué)》2017年06期 　論文類型：期刊論文

【摘要】：西藏嘎拉勒銅金礦床作為構(gòu)造背景反演指示針的成巖成礦年代學(xué)研究較為匱乏,使得該成礦帶區(qū)域背景-構(gòu)造-巖漿-成礦活動(dòng)系列研究步履維艱,利用LA-ICP-MS(laser ablation inductively coupled plasma mass spectrometry)鋯石U-Pb測(cè)年、輝鉬礦Re-Os定年及Lu-Hf同位素技術(shù),首次全面厘定了區(qū)內(nèi)侵入巖侵位時(shí)序、探討了巖石成因并確定了成礦時(shí)代.結(jié)果表明,成礦前閃長(zhǎng)巖成巖年齡為155.8±2.3Ma,侵位于晚侏羅世初期,εHf(t)值分布于-14.68~-8.34,平均值-11.74,是班公湖-怒江特提斯洋南向俯沖的產(chǎn)物;花崗閃長(zhǎng)巖為礦區(qū)成礦母巖,其成巖年齡為88±1Ma(MSWD=0.56,n=21),εHf(t)值分布于5.84~9.20,平均值7.72,成礦后花崗斑巖成巖年齡為84.67±0.80Ma(MSWD=1.9,n=18),εHf(t)值分布于6.32~9.78,平均值8.40,二者均為晚白堊世侵位,為拉薩地體與羌塘地體匯聚的產(chǎn)物;礦區(qū)輝鉬礦Re-Os等時(shí)線年齡為88.55±0.60Ma(MSWD=0.60,n=8),與成礦母巖(花崗閃長(zhǎng)巖)成巖年齡一致.研究表明,在班公湖-怒江特提斯洋南向俯沖至碰撞過(guò)程中在礦區(qū)內(nèi)均有相應(yīng)的巖漿活動(dòng)響應(yīng),嘎拉勒銅金礦床則為典型的碰撞期成礦作用的產(chǎn)物.
[Abstract]:The diagenetic and metallogenic chronology of the Galal copper gold deposit as an indicator of tectonic background inversion in Tibet is relatively scarce, which makes it difficult to study the series of regional setting, tectonic-magmatic and metallogenic activities in this metallogenic belt. Using LA-ICP-MS(laser ablation inductively coupled plasma mass dating, Re-Os dating and Lu-Hf isotopic technique, the emplacement sequence of intrusive rocks in the area is determined for the first time, the genesis of the rocks is discussed and the metallogenic age is determined. The diagenetic age of metallogenic diorite is 155.8 鹵2.3 Ma.The transgression is located in the early late Jurassic, the 蔚 Hfct) is distributed in the range of -14.68 ~ 8.34, the average value is -11.74, which is the product of southward subduction of Tethys in Bangong Lake and Nujiang River, and the granodiorite is the ore-forming mother rock of the ore area. Its diagenetic age is 88 鹵1 鹵1 Ma MSWD0. 56GW ~ (21), 蔚 Hft2) is distributed in 5.84 ~ 9.20 with an average value of 7.72. The diagenetic age of post-metallogenic granitic porphyry is 84.67 鹵0.80 Ma MSWDN _ (1.9) ~ (18), 蔚 Hft) distributed in 6.32 ~ (9.78) with an average value of 8.40, both of which are the product of late Cretaceous emplacement and convergence of the Lhasa and Qiangtang terrane, and the diagenetic age of the granitic porphyry is 84.67 鹵0.80 Ma, and the mean value of 蔚 Hftt is 8.40. The Re-Os isochron age of molybdenum deposit is 88.55 鹵0.60 Ma, which is consistent with the diagenetic age of ore-forming parent rock (granodiorite). The Galal copper-gold deposit is the product of typical collisional mineralization.
【作者單位】： 中國(guó)地質(zhì)調(diào)查局成都地質(zhì)調(diào)查中心;成都理工大學(xué)地球科學(xué)學(xué)院;中國(guó)地質(zhì)科學(xué)院礦產(chǎn)資源研究所國(guó)土資源部成礦作用與資源評(píng)價(jià)重點(diǎn)實(shí)驗(yàn)室;中國(guó)地質(zhì)調(diào)查局發(fā)展研究中心;
【基金】：中國(guó)地質(zhì)調(diào)查局地質(zhì)調(diào)查項(xiàng)目(No.DD20160015) 國(guó)家自然科學(xué)基金項(xiàng)目(No.41402178) 公益性行業(yè)科研專項(xiàng)(No.201511017) 成都地質(zhì)調(diào)查中心所控基金項(xiàng)目(No.所控基[2015]-06)
【分類號(hào)】：P597.3;P618.41;P618.51

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