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東天山圪塔山口鎂鐵-超鎂鐵質巖體地球化學、鋯石U-Pb年代學及其對Ni-Cu成礦的指示*

2014-04-10 01:22馮宏業許英霞秦克章唐冬梅郭海兵三金柱毛亞晶
巖石學報 2014年6期
關鍵詞:東天山輝長巖鐵質

馮宏業 許英霞 秦克章 唐冬梅 郭海兵 三金柱 毛亞晶,4

1. 河北聯合大學礦業工程學院地質系,唐山 0630092. 中國科學院礦產資源研究重點實驗室,中國科學院地質與地球物理研究所,北京 1000293. 新疆有色地勘局704隊,哈密 8390004. 中國科學院新疆礦產資源研究中心,中國科學院新疆生態與地理研究所,烏魯木齊 8300111.

新疆新近發現的圪塔山口鎳銅硫化物礦床位于東天山康古爾-黃山鎳銅硫化物成礦帶的東端。礦區包含4個鎂鐵-超鎂鐵質巖體,其中Ⅰ、Ⅱ、Ⅲ號巖體均見鎳銅硫化物礦化。本文利用SIMS鋯石U-Pb法測得Ⅰ號礦化巖體輝長巖年齡為282.6±1.9Ma,不僅與東天山地區其它含Ni-Cu礦化的鎂鐵-超鎂鐵質巖體形成時代一致,而且與塔里木玄武巖、鎂鐵質巖墻及北山地區的鎂鐵-超鎂鐵質巖體形成時限相一致。其形成可能與造山后伸展背景下的地幔柱疊加作用有關。地球化學數據表明圪塔山口巖體具有高Mg特征,除2個輝長巖樣品m/f值較低外,其余14個樣品集中于2.73~5.05之間,屬鐵質超基性巖。巖石稀土元素配分模式為右傾式,輕、重稀土比2.64~3.39;含長角閃輝橄巖及部分含長角閃橄輝巖和含長橄輝巖δEu具正異常,可能與這3個巖相中存在斜長石的結晶有關。微量元素蛛網圖表明巖石富集大離子親石元素Cs、Rb、Ba、K、Sr,富集高場強元素U、Pb,虧損高場強元素Th、Nb等特征。主量元素SiO2-(Na2O+K2O)與(FeOT/MgO)-FeOT圖解、微量元素相關圖及微量元素比值相關圖說明圪塔山口巖體成巖物質為來源于虧損地幔的鈣堿性玄武質巖漿,成巖作用以巖漿結晶分異為主導,并受到地殼的混染作用,具有較好的鎳銅硫化物礦床成礦潛力。

鎂鐵-超鎂鐵質巖;地球化學;鋯石U-Pb測年;鎳銅硫化物成礦潛力;圪塔山口;東天山

東疆地區是我國重要的銅、鎳、金成礦帶,其中與鎳銅硫化物礦床相關的鎂鐵-超鎂鐵質巖體主要聚集在東天山地區的康古爾-黃山韌性剪切帶中(毛景文等,2002;秦克章等,2002,2007;Qinetal., 2003,2011;Xuetal., 2003)。許多學者對東天山鎳銅成礦帶進行過研究(倪志耀,1991,1992;秦克章,2000;王登紅等,2000;毛景文等,2002;Xuetal., 2003;王玉往等,2004,2009;秦克章等,2003,2012;孫赫等,2006,2008;唐冬梅等,2009a;Tangetal., 2011;三金柱等,2007,2010)。區內含鎳銅硫化物的鎂鐵-超鎂鐵質巖體多沿康古爾-黃山深大斷裂分布,新近發現的圪塔山口含硫化物鎂鐵-超鎂鐵質巖體緊鄰康古爾-黃山深大斷裂,位于圖拉爾根大型銅鎳鈷礦床的東部,相距僅18km,研究程度甚低,成巖成礦過程與時代等均未查明。而其成巖成礦時代與東天山其它鎂鐵-超鎂鐵質巖體是否一致、巖漿源區是否相同均不明確,直接影響對其成礦前景的判斷。為了確定圪塔山口巖體的成巖成礦年齡及源區特征,本文選取了礦區Ⅰ號含礦巖體的輝長巖進行了SIMS鋯石U-Pb年齡測試,并選擇了不同巖性的代表性樣品進行了巖石主、微量元素地球化學分析研究,為判別其成礦地質背景與成礦潛力提供地球化學和年代學制約。

1 區域地質背景

圪塔山口鎳銅礦床大地構造位置上處于準噶爾與東天山覺羅塔格古生代溝-弧-盆體系拼接所形成的康古爾塔格-黃山韌性剪切帶上,區域上位于東天山鎳-銅成礦帶的東端(圖1)。東天山地區經歷了多次構造運動,以發育東西向和北東東向區域性深大斷裂及韌性剪切斷層為特征,這些斷裂構造為鎂鐵-超鎂鐵質巖漿的就位與成礦提供了有利的導礦和容礦空間。沿康古爾-黃山深大斷裂,動力變質作用極其強烈,形成規模巨大的韌性剪切帶,以強烈擠壓、走滑兼韌性剪切為特征(Xuetal., 2003)。

區域內出露地層主要為古生界的石炭系和泥盆系,其次為中上元古界和新生界地層。中上元古界主要分布于中天山和北山地區,為一套變質碳酸鹽巖-碎屑巖地層。泥盆系和石炭系大多分布于沙泉子斷裂帶以北,主要為一套海相火山噴發-沉積建造。新生界主要為陸相碎屑沉積物,廣泛分布于區內低洼地帶。

區內巖漿巖發育,侵入巖以中酸性巖類為主,其次為基性、超基性巖類,多為華力西期產物?;鹕綆r類以基性熔巖、中酸性熔巖及火山碎屑巖最為常見。巖體與火山巖由于受區域深大斷裂控制而多沿斷裂構造的延伸方向展布。沿康古爾-黃山韌性剪切帶形成鎂鐵-超鎂鐵質侵入巖帶,呈北東東向帶狀分布,從西向東分布有土墩、二紅洼、香山、黃山南、黃山、黃山東、葫蘆、馬蹄、咸水泉、圖拉爾根、圪塔山口、四頂黑山等多個巖體(圖1)。

2 礦區地質與巖體特征

圪塔山口為東天山鎳銅成礦帶東端新發現的含鎳銅巖體,系新疆有色地勘局704隊近年來1:5萬礦調過程中的重要發現。礦區由4個鎂鐵-超鎂鐵質巖體組成,出露地層主要為下泥盆統大南湖組和新生界地層(圖2a)。大南湖組(D1d)地層分布在康古爾-黃山斷裂帶北部,呈北東東向大面積展布,為一套海相火山噴發-沉積建造、火山碎屑沉積建造,可分為四個亞組,每個亞組之間都為斷層接觸。礦區內僅見有第一亞組(D1d1)的一套深灰色、灰綠色、灰紫色、紫紅色厚層狀安山質、英安質熔巖、火山碎屑巖及灰綠色、紫紅色砂巖。新生界地層主要為第四系上更新統-全新統(Q3-4Pl)和(Q4Pl),分布于工作區中部大溝及北西部洼地內,由一套洪積物,主要由砂、礫石及亞砂土組成。

受區域性深大斷裂的控制,礦區內斷裂破碎帶均沿北東東向分布,以強烈擠壓、走滑兼韌性剪切為特征,地表巖石多表現為強片理化及斷層破碎,帶內巖石具強烈糜棱巖化和塑性變形特征。該斷裂帶對區內基性巖體的侵入具有十分重要的控制作用。

區內出露的巖漿巖多以侵入巖為主,為華力西期的產物。沿北東向分布有一系列閃長巖、安山玢巖、花崗巖及4個鎂鐵-超鎂鐵質巖體,其中除Ⅳ號巖體沿北西向延伸外,其它3個巖體均呈脈狀,沿北東東向展布(圖2a)。

圖1 東天山區域地質簡圖與圪塔山口Ni-Cu硫化物礦化巖體大地構造位置(據秦克章等,2002,2007補充修改)1-第四紀;2-泥盆紀-石炭紀沉積火山巖、變質火山巖;3-早石炭紀弧火山巖;4-泥盆紀火山巖;5-前寒武紀變質巖;6-康古爾-黃山韌性剪切帶;7-鎂鐵-超鎂鐵質巖體;8-實測斷層;9-推測斷層;10-研究區Fig.1 The regional geological map of eastern Tianshan and location of Getashankou Ni-Cu bearing intrusion (Revised after Qin et al., 2002, 2007)1-Quarterary; 2-Devonian-Carboniferous metamorphosed volcano-sedimentary rocks; 3-Early Carboniferous arc-volcanic rocks; 4-Devonian volcanic rocks; 5-Pre-Camberian metamorphic basement; 6-Kanggur-Huangshan ductile shear zone; 7-mafic-ultramafic intrusion; 8-measured fault; 9-inferred fault; 10-study area

Ⅰ號巖體:地表露頭長300m,寬100m,呈北東東向延伸的透鏡狀,傾向南東,傾角65°~69°左右。地表出露巖性主要為石英閃長巖、閃長巖、角閃輝長巖、輝長巖、輝石橄欖巖,巖漿分異演化完全。地表球形風化發育,局部見有星點狀孔雀石。巖體與圍巖界線清楚,接觸帶內局部可見細脈狀的石英脈。巖石蝕變強烈,主要有蛇紋石化、石棉化、透閃石化及褐鐵礦化等。鎳銅礦化主要分布于角閃輝長巖和輝石橄欖巖中,見有星點狀黃鐵礦、磁黃鐵礦和黃銅礦(圖3a)。

Ⅱ號巖體:呈條帶狀,長400m,寬10~40m,巖體走向約60°,傾向南,傾角45°~69°。平面上呈環帶狀巖相分帶,沿圖2a中勘探線方向自北向南巖性依次為:角閃輝長巖相→輝石橄欖巖相→橄欖輝石巖相→輝長巖相,相鄰巖相間為漸變過渡接觸,指示分異演化完全。礦體位于巖體的中上部,主要賦存于橄欖巖相及橄欖輝石巖相中,這兩種巖相具全巖礦化特征。地表角閃輝長巖為塊狀;橄欖巖為粉末狀、碎粒狀,巖石強烈蝕變,橄欖石多變為蛇紋石(圖3b)或纖維狀石棉,部分風化成褐黃色、褐紅色、紅色土狀粉末,品位較高,見有鎳華(圖3c);橄欖輝石巖多呈碎粒狀、羊糞蛋狀,見有大量網脈狀、纖維狀的石棉;輝長巖為碎塊狀。巖體深部總體表現為一透鏡狀巖體,西端埋深較小,東端埋深較大,與地表水平分帶特征相對應,巖體在垂向上也存在巖相分帶特征,即中心為橄欖輝石巖相與橄欖巖相,上部為角閃輝長巖相,下部輝長巖相(圖2b),各巖相之間無明顯界線。其中橄欖輝石巖相占巖體的大部分,該巖相局部存在礦化富集,形成低品位礦體;橄欖巖相位于巖體的中上部,為礦化最富集的賦礦巖相,往往形成高品位礦體,主要礦石礦物為磁黃鐵礦,其次為黃銅礦和鎳黃鐵礦(圖3d);輝長巖相中僅見到少量的礦化。硫化物組合與結構構造與東天山區域上的已知銅鎳礦床(丁奎首等,2007)相似。

Ⅲ號巖體:位于Ⅰ號巖體東部,Ⅱ號巖體北側,呈脈狀延伸,沿走向(70°)長約700m,寬5~36m,傾向南東,傾角52°~67°,巖體在地表可分為兩個巖相,上盤為輝長巖相,下盤為輝橄巖相,二者呈漸變過渡關系(圖3e),巖性主要為角閃輝長巖及含長輝橄巖,含長輝橄巖位于巖體下盤,其下與一套厚約1~6m的灰黑色炭質片巖呈斷層接觸。地表巖石呈粉末狀、 碎粒狀, 蝕變強烈,主要為蛇紋石化、透閃石化。巖石中可見有大量的褐鐵礦,局部富集形成黃褐色鐵帽帶,鐵帽帶中見有大量孔雀石(圖3f)。巖體在垂向上具有薄層狀輝長巖相-橄欖巖相-角閃輝長巖相的分帶特征。巖體整體表現為西端基性程度相對較低,向東基性程度逐漸增高,局部見有橄欖巖相。礦石大部分為星點狀、浸染狀-稠密浸染狀、海綿隕鐵結構的礦石,局部出現了貫入式塊狀礦石(圖3g)。

圖2圪塔山口礦區地質簡圖(a)與6號勘探線剖面圖(b)(據新疆有色地勘局704隊,2011*新疆有色地勘局704隊.2011.新疆哈密市頭蘇泉地區銅鎳金礦普查年度總結報告(2011年度)修改)

Fig.2Simplified geological map of Getashankou ore district (a) and geological profile of No.6 exploration line (b)

圖3 圪塔山口鎂鐵-超鎂鐵質巖體宏觀及顯微照片(a)-地表星點狀礦化超基性巖體;(b)-蛇紋石化橄欖石(正交光);(c)-鎳華;(d)-硫化物組成;(e)-Ⅲ號巖體地表巖相關系;(f)-地表孔雀石化;(g)-貫入的塊狀硫化物;(h)-測年輝長巖樣品照片;(i)-測年輝長巖顯微照片(正交光).Mal-孔雀石;Sulf-硫化物;Ol-橄欖石;Serp-蛇紋石;Cpx-單斜輝石;Opx-斜方輝石;Cp-黃銅礦;Po-磁黃鐵礦;Pn-鎳黃鐵礦;Mag-磁鐵礦;Hbl-角閃石;Pl-斜長石Fig.3 The macrophotograph and microphotograph of Getashankou mafic-ultramafic intrusions(a)-the disseminated ore-bearing ultramafic intrusion on the surface; (b)-olivine altered into Serpentine (crossed polar); (c)-annabergite; (d)-the composition of sulfides (reflecting microscope); (e)-the lithofacies change of intrusion Ⅲ on the surface ; (f)-the malachite-bearing intrusion on the surface; (g)-massive sulfide; (h)-image of the gabbro for age dating; (i)-microphotograph of the gabbro for age dating (crossed polar). Mal-malachite; Sulf-sulfide; Ol-olivine; Serp-serpentine; Cpx-clinopyroxene; Opx-orthopyroxene; Cp-chalcopyrite; Po-pyrrhotite; Pn-pentlandite; Mag-magnetite; Hbl-hornblende; Pl-plagioclase

Ⅳ號巖體:地表長約420m,寬約100m,呈透鏡狀產出,侵位于泥盆系下統大南湖組第一亞組第七巖性段的凝灰巖、砂巖中。地表出露巖性主要為輝長巖與角閃輝長巖,巖相相對單一,礦化程度低。其礦物組成及粒度與其它巖體有所不同,加之其走向為北西向,因此我們推測其與其它巖體可能不是同一時期的產物。

為了精確測定圪塔山口含礦巖體的形成時限及礦區構造背景,進而為判別巖體成礦前景及完善東天山地區的構造演化提供年代學和地球化學制約,本文選擇了Ⅰ號巖體的輝長巖(約20kg,圖3h)及不同巖性的代表性樣品,進行SIMS鋯石U-Pb年代學及巖石主微量的研究,測年樣品取樣位置見圖2。

Ⅰ號巖體測年輝長巖顯微鏡下特征如圖3i所示,其礦物組成特征如下:輝石(包括斜方輝石和單斜輝石)占45%~50%,半自形-他形,總體新鮮,部分纖閃石化;角閃石:約5%,半自形-他形,多呈特征的棕色,多色性顯著,包裹輝石、長石或充填于輝石、長石的晶隙之間,說明其生成較晚;斜長石:45%~50%,自形晶-他形,自形晶者形成堆晶或被輝石、角閃石包裹,反映了其結晶早于輝石,蝕變較強;半自形-他形者充填于晶體間隙,相對自形晶者而言,其蝕變程度較低,顯微鏡下測得其最大消光角為32.5°,對應An牌號值57.5,為拉長石;副礦物主要包括磷灰石、鋯石、磁鐵礦、尖晶石等。

表1圪塔山口鎂鐵-超鎂鐵質巖體主量元素(wt%)和微量元素(×10-6)分析結果

Table 1Major (wt%) and trace (×10-6) element compositions of Getashankou mafic-ultramafic intrusions

樣品號GT602-127GT602-133GT803-202GT801-40GT602-85GTS602-113GTS602-120GTS602-100巖性含長角閃輝橄巖含長輝橄巖含長角閃橄輝巖角閃橄輝巖SiO239.1538.4639.0540.3939.7839.5739.5639.58TiO20.430.400.620.610.460.530.470.51Al2O36.146.026.097.166.715.695.906.16Fe2O311.7712.7113.9912.0911.0011.9211.4811.11MnO0.150.150.160.160.150.150.150.15MgO28.6628.2826.8926.4928.3928.6229.0528.30CaO3.113.193.194.063.473.143.233.46Na2O0.380.320.380.550.450.440.430.48K2O0.510.460.250.260.560.610.570.54P2O50.080.070.100.100.080.090.080.09燒失量8.238.297.956.757.957.997.748.33總量98.6198.3598.6798.6299.0098.7598.6698.71S—1.051.430.55—0.34——Fe2O3*—10.7711.2411.09—11.34——FeOT11.7212.713.8811.8410.8711.8211.3611.06Mg#0.830.810.790.810.840.830.830.83m/f4.764.353.754.285.054.714.964.97Sc11.412.715.416.412.913.213.314.5V84.782.897.611087.998.393.8105Cr20431855127117462401191821882486Co120154166124115122118124Ni14352641253716401222160713301498Cu36011311081565190358177235Zn79.778.177.083.581.476.575.776.0Rb15.515.46.866.1816.117.718.617.9Sr210185142182163132242119Y7.006.6210.910.27.708.598.429.05Zr69.862.895.787.672.484.875.296.5Nb1.331.231.501.581.791.631.381.61Cs5.565.141.931.044.104.274.986.20Ba83.893.142.455.358.583.597.757.7La2.682.713.303.352.913.342.973.56Ce6.636.538.568.686.797.627.028.52Pr0.910.851.301.300.951.101.081.20Nd4.434.116.496.034.705.285.105.49Sm1.031.051.601.521.381.381.321.52Eu0.500.430.610.550.500.530.450.55Gd1.181.121.991.821.321.281.261.35Tb0.230.210.360.330.270.240.270.29Dy1.501.382.302.101.621.601.761.80Ho0.310.280.500.410.310.320.350.38Er0.880.841.401.200.850.981.011.08Tm0.140.120.210.190.130.140.160.16Yb0.920.771.311.240.821.001.001.13Hf1.601.202.092.081.631.941.561.92Lu0.140.110.190.170.120.140.150.17Ta0.120.110.130.120.110.130.120.14Tl0.150.150.050.040.110.130.110.12Pb1.842.236.264.672.443.581.993.18Th0.410.420.400.430.370.450.420.48U0.160.210.170.190.150.170.180.20ΣREE21.4820.5130.1228.8922.6724.9623.8827.02LREE/HREE3.053.252.642.873.173.383.013.28δEu1.381.211.041.011.121.201.041.15

續表1

Continued Table 1

樣品號GT602-158GT602-143GT801-48GT1002-144GT802-162GTSTC14-2GT801-113GT801-129巖性含長橄輝巖角閃輝長巖輝長巖SiO239.9738.4439.1744.2245.1450.8144.5844.02TiO20.360.460.431.010.911.220.780.86Al2O38.526.127.7210.9812.6416.5514.7214.83Fe2O311.6113.813.2912.1510.168.1910.2913.00MnO0.150.150.150.140.150.140.130.13MgO25.4227.3925.6918.1315.726.0814.2910.48CaO4.483.204.205.236.747.977.917.90Na2O0.490.360.500.792.403.361.712.34K2O0.260.460.240.120.340.550.490.32P2O50.060.080.070.170.150.180.120.13燒失量7.057.686.946.254.814.394.604.90總量98.3798.1498.4099.1999.1699.4499.6298.91FeOT11.4413.7313.0811.779.697.759.7810.34S—1.441.441.17———2.54Fe2O3*—11.0610.509.75———7.97Mg#0.810.800.790.750.760.600.730.66m/f4.293.893.792.923.201.452.731.92Sc12.312.012.718.820.530.717.318.1V79.188.783.9144148213125146Cr170418921715547582239383243Co12215814998.570.731.182.2149Ni13902807217985138459.85381776Cu5161260124820611643.44272563Zn77.581.872.582.078.987.669.778.5Rb7.8412.75.391.244.279.272.484.19Sr214151198216283541376404Y5.856.906.3616.916.222.613.015.0Zr52.071.657.213013219088.4121Nb1.231.411.053.252.743.572.032.37Cs1.873.230.800.280.260.740.290.17Ba40.058.844.875.728339680.2105La2.352.752.355.795.898.414.765.68Ce5.566.455.7614.514.219.611.213.2Pr0.740.900.772.092.062.691.601.87Nd3.304.293.819.9010.113.27.338.91Sm0.851.091.042.652.583.252.072.46Eu0.390.380.360.900.861.170.780.85Gd0.951.031.062.642.753.572.192.50Tb0.170.210.190.500.520.730.410.50Dy1.051.341.143.133.194.422.503.02Ho0.220.290.260.680.650.920.510.61Er0.650.790.681.861.802.601.481.73Tm0.100.120.110.300.280.420.220.27Yb0.650.800.651.811.802.661.411.76Hf1.161.381.303.133.134.182.373.02Lu0.100.120.090.260.280.380.210.26Ta0.090.100.100.210.190.270.140.18Tl0.070.140.040.030.030.070.020.03Pb2.475.095.309.182.544.433.626.23Th0.320.400.320.670.891.290.570.85U0.100.160.140.210.310.900.190.33ΣREE17.0720.5518.2764.0247.0146.9536.6643.62LREE/HREE3.393.383.373.083.203.173.113.09δEu1.301.081.041.041.030.981.111.03

注:Mg#=Mg2+/(Mg2++Fe2+),m/f=(Mg2++Ni2+)/(Fe3++Fe2++Mn2+), FeOT=0.9×Fe2O3,Fe2O3*表示扣除硫化物中鐵轉化的Fe2O3以后的Fe2O3的含量;表中所涉及到主量元素的計算及文中主量元素投圖時均按扣除燒失量后的百分含量計,其中“—”表示未測試

圖4 圪塔山口巖體主要氧化物與MgO相關性圖Fig.4 Diagrams of oxides versus MgO of Getashankou intrusions

3 巖石地球化學

本文選取了圪塔山口礦區輝石橄欖巖相、橄欖輝石巖相和輝長巖相的不同樣品,分別進行了全巖主、微量元素分析。其中,主量元素分析在中國科學院地質與地球物理研究所礦產資源研究重點實驗室XRF-1500X射線熒光光譜儀上完成;微量元素分析在核工業地質研究院完成,具體巖石類型及分析結果見表1,部分樣品取樣位置見圖2。

3.1 主量元素地球化學

圪塔山口礦區全巖SiO2含量為38.44%~50.81%,平均44.97%;Fe2O3含量為8.19%~13.99%,平均11.79%;Al2O3含量為5.69%~16.55%,平均8.87%;CaO含量為3.11%~7.97%,平均4.66%;K2O含量為0.12%~0.61%,平均0.39%;Na2O含量為0.32%~3.36%,平均0.96%;MnO含量為0.13%~0.16%,平均0.15%;TiO2含量為0.36%~1.22%,平均0.63%;MgO含量為6.08%~29.05%,平均22.99%;Mg#較高,為0.60~0.84。主要氧化物與MgO的相關性(圖4)表明:除了K2O與MgO相關關系不明確以外,SiO2、TiO2、Al2O3、CaO、Na2O與MgO呈現明顯的負相關關系, FeOT和MnO則呈現正相關關系,這與巖漿結晶時礦物的晶出順序是對應的,說明結晶分異作用控制巖漿的主要化學成分變化。

全巖硅堿圖表明圪塔山口鎂鐵-超鎂鐵質巖體的巖漿屬亞堿性系列(圖5a),由于圪塔山口巖體含有較高的MgO含量,且主要為超基性巖-基性巖,不宜用FAM圖判別其巖石系列。本文利用(FeOT/MgO)-FeOT關系圖對圪塔山口巖漿的性質進行簡單的判別,其結果表明圪塔山口巖漿具鈣堿性玄武巖向島弧拉斑玄武巖過渡的特征(圖5b)。同時礦物學的研究也證實圪塔山口巖漿為來源于地幔的鈣堿性玄武質巖漿(Fengetal., 2012),因此圪塔山口巖漿性質應為以鈣堿性玄武質巖漿為主的巖漿類型。據孫赫等(2007)、秦克章等(2012)研究,認為東天山地區鎂鐵-超鎂鐵質巖體巖漿具有從拉斑玄武巖向鈣堿性玄武巖過渡的趨勢,鈣堿性巖漿源更有利于東天山地區巖漿鎳銅硫化物礦床的形成。圪塔山口巖體除兩個輝長巖樣品m/f值小于2之外,其余樣品m/f值介于2.73~5.05之間,而這一范圍與東天山地區的黃山、香山、黃山東巖體(王潤民等,1987)及圖拉爾根、葫蘆、白石泉巖體總體一致(孫赫等,2007),均為與巖漿型鎳銅或鉑族元素相關的類型。因此,圪塔山口鎂鐵-超鎂鐵質巖體與東天山地區眾多鎂鐵-超鎂鐵質巖體鎳銅硫化物礦床具有相同的、有利于形成巖漿硫化物礦床的巖漿源區特征。

3.2 稀土與微量元素地球化學

圪塔山口巖體稀土元素球粒隕石標準化配分模式為輕稀土富集的右傾式(圖6a),輕、重稀土比LREE/HREE為2.64~3.39;含長角閃輝橄巖及部分含長角閃橄輝巖、含長橄輝巖δEu具正異常,可能與這3個巖相中存在斜長石的結晶有關。微量元素原始地幔標準化蛛網圖表明樣品富集大離子親石元素Cs、Rb、Ba、K、Sr及高場強元素U、Pb,虧損高場強元素Th、Nb(圖6b),說明巖石具島弧親緣性(Cox, 1980)。在Nb-Zr相關性圖中,圪塔山口樣品基本上位于虧損型地幔區(圖7),說明成巖物質來源于虧損的地幔。

圖5 圪塔山口巖體巖石SiO2-(Na2O+K2O)(a,底圖據Irvine and Baragar, 1971)與(FeOT/MgO)-FeOT (b,底圖據Miyashiro and Shido, 1975)化學分類圖解CA-鈣堿性玄武巖系列區;TH-拉斑玄武巖系列區Fig.5 The petrochemical Series classification diagram of SiO2-(Na2O+K2O) (a, after Irvine and Baragar, 1971) and (FeOT/MgO)-FeOT (b, after Miyashiro and Shido, 1975) for Getashankou intrusions CA-calc-alkaline basalt series; TH-tholeiite basalt series

圖6 圪塔山口巖體球粒隕石標準化稀土元素配分圖(a, 標準化值據Boynton, 1989)與原始地幔標準化微量元素蛛網圖(b,標準化值據Sun and McDonough, 1989)Fig.6 Chondrite-normalized REE patterns (a, normalizing values after Boynton, 1989) and PM-normalized trace elements spider diagram (b, normalizing values after Sun and McDonough, 1989) of Getashankou intrusions

4 SIMS鋯石U-Pb測年

用于SIMS鋯石U-Pb年齡測定的樣品委托廊坊市河北地礦局區域礦產調查研究所實驗室完成鋯石樣品的分選工作。然后將鋯石樣品、鋯石標樣Ple?ovice(Slámaetal., 2008)和實驗室鋯石工作標樣Qinghu(Lietal., 2009)粘貼在環氧樹脂靶上,拋光使其暴露一半晶面。對鋯石進行透、反射光顯微照相以及陰極發光圖像分析,以檢查鋯石的內部結構、選擇適宜的測試點位。在真空下給樣品靶鍍金以備分析。

U、Th、Pb的測定在中國科學院地質與地球物理研究所CAMECA IMS-1280二次離子質譜儀(SIMS)上進行,詳細分析方法見Lietal.(2009)。鋯石標樣與鋯石樣品以1:3比例交替測定。U-Th-Pb同位素比值與含量分別用標準鋯石Ple?ovice(337Ma, Slámaetal., 2008)和91500(U=81×10-6, Wiedenbecketal., 1995)校正獲得,以長期監測標準樣品獲得的標準偏差(1SD=1.5%, Lietal., 2010)和單點測試內部精度共同傳遞得到樣品單點誤差,用標準樣品Qinghu(159.5Ma, Lietal., 2009)作為未知樣監測數據的精確度。普通Pb的校正采用實測204Pb值,由于所測普通Pb含量非常低,可以假定其主要來源于制樣過程中帶入的表面Pb污染,以現代地殼平均Pb同位素組成(Stacey and Kramers, 1975)作為普通Pb組成進行校正。同位素比值與年齡誤差均為1σ。采用ISOPLOT軟件(Ludwig, 2001)對測試數據進行處理。

圖7 圪塔山口巖體的Nb-Zr地幔類型判別圖(底圖據Le Roex et al., 1983)Fig.7 The Nb-Zr discrimination diagram of mantle types for Getashankou intrusions (after Le Roex et al., 1983)

測年樣品中鋯石呈透明的長柱狀-短柱狀,自形-半自形晶,部分鋯石可見環帶狀結構,多數鋯石長軸長50~200μm,部分可達250μm。本文共分析了20粒鋯石樣品(圖8a),測試結果見表2。鋯石U、Th、Pb含量分別為466×10-6~1670×10-6,404×10-6~3011×10-6和27×10-6~119×10-6,Th/U介于0.866到1.830之間,除2個測試點之外均大于1.136,表明所測樣品均為典型的巖漿鋯石(Daniela, 2002)。f206%最大為0.08,表明普通Pb占全部Pb的比例很小。如圖8b所示,所有樣品均落在諧和曲線附近,所得圪塔山口輝長巖的鋯石206Pb/238U-207Pb/235U諧和年齡為282.6±1.9Ma,平均權重方差MSWD=0.15。

圖8 圪塔山口輝長巖樣品鋯石陰極發光圖像及其U-Pb諧和年齡圖Fig.8 Cathodoluminescene images and concordia plot of U-Pb analysis of zircons separate from Getashankou gabbros

5 討論

5.1 成巖年齡及意義

巖漿鎳銅硫化物礦床的成巖、成礦作用基本同時發生,因此這一輝長巖年齡(282.6±1.9Ma)可以說明圪塔山口鎳銅硫化物礦床的成巖成礦時代為早二疊世。

東天山地區發育大量二疊紀與鎂鐵-超鎂鐵質巖體有關的大中型巖漿型鎳銅硫化物礦床,如黃山、黃山東、黃山南、圖拉爾根、香山和葫蘆等,其成巖成礦時代為圖拉爾根I號巖體輝長巖的單顆粒鋯石U-Pb年齡為300.5±3.2Ma(三金柱等,2010);黃山東黑云母橄欖蘇長巖的SHRIMP鋯石U-Pb年齡274±3Ma(韓寶福等,2004),銅鎳硫化物礦石Re-Os等時線年齡為282±20Ma(毛景文等,2002);黃山單顆粒鋯石U-Pb年齡284Ma(Qinetal., 2011);香山輝長巖和鈦鐵輝長巖單顆粒鋯石年齡分別為285±1.2Ma和278±1.8Ma(秦克章等,2001;肖慶華等,2010;Qinetal., 2011);天宇輝長巖鋯石年齡280±2Ma(Tangetal., 2011);白石泉輝長巖鋯石年齡281.2±0.9Ma(毛啟貴等,2006),Re-Os等時線年齡為286±14Ma(王虹等,2007);葫蘆Re-Os等時線年齡為283±13Ma(陳世平等,2005)。

綜上可知東天山地區鎂鐵-超鎂鐵質巖體形成時代主要集中在早二疊世,個別礦區輝長巖為晚石炭世,從巖體年齡上來看,圪塔山口巖體與已知區域上大中型鎳銅礦床一致。其測年結果將東天山地區280Ma左右的幔源巖漿作用向東推進到了中蒙邊界,從而大大拓展了東天山地區尋找該時代鎳銅礦床的空間。同時這一年齡對鄰區圖拉爾根礦床的形成也具有一定的指示意義,圖拉爾根I號巖體輝長巖鋯石年齡300.5±3.2Ma(三金柱等,2010),明顯早于區域上其它巖體的年齡,因此本文推測圖拉爾根可能存在另一期巖漿活動,有待進一步查證。

圖9 圪塔山口巖體同化混染判別圖(原始地幔和上下地殼值據Sun and McDonough, 1989)Fig.9 Geochemical discriminant of assimilate contamination for Getashankou intrusions (data of original mantle and crust from Sun and McDonough, 1989)

5.2 地殼混染作用

研究表明不同元素在不同礦物中的相容性不同,隨著結晶作用的進行,殘余巖漿會逐漸富集早期結晶相中的不相容元素、虧損早期結晶相中的相容元素,即巖漿在結晶過程中元素豐度會隨之變化,而總分配系數相同或者很相近的元素比值不會因結晶作用而改變。因此,總分配系數相同或者很相近、對同化混染作用又敏感的元素比值間的協變關系,可以檢驗同化混染作用的存在與否(Campbell and Griffiths, 1993; Mecdonaldetal., 2001; 姜常義等, 2007; Sunetal., 2008; Tangetal., 2012)。從圖9中可以看出巖石的Ce/Nb-Th/Nb、Ta/Yb-Th/Yb以及TiO2/Yb-La/Yb協變關系均表現為一致的正相關,說明巖體存在明顯的同化混染作用。而Nb/Th比值介于上地殼和下地殼之間,說明同化混染的物質可能來源于地殼。據Hofmann(1988)典型地幔的Ce/Pb值為20~30,平均25,地殼的Ce/Pb值小于15。由表1可知,圪塔山口巖體的Ce/Pb值介于1.09~5.59,為地殼值范圍,加之Nb的強烈虧損、Zr的明顯富集(圖6b),均表明圪塔山口巖體存在地殼的混染作用。圪塔山口礦區圍巖為泥盆系大南湖組凝灰巖、砂巖等,圍巖中富含豐富的黃鐵礦,相關研究表明圪塔山口巖漿侵位過程中始終處于S飽和狀態(馮宏業,2014;馮宏業等,2014),可能正是圍巖混染時帶入的S使得巖漿體系始終保持S的飽和,從而使硫化物得以不斷熔離。

5.3 可能的構造背景

關于東天山地區康古爾-黃山鎳銅成礦帶鎂鐵-超鎂鐵質巖體形成的大地構造背景的爭論一直存在。姬金生等(1994)、李文鉛等(2000)認為康古爾韌性剪切帶為縫合帶,黃山-鏡兒泉地區超基性巖為蛇綠巖套的一部分。也有學者認為康古爾-黃山地區為弧后拉張盆地(左國朝等,1992),東天山地區銅鎳礦就產生于裂谷或裂陷槽背景(馮益民等,2002)。秦克章等(2002)、Qinetal.(2003)認為東天山地區早石炭世已進入弧后裂陷伸展階段,晚石炭世弧后盆地折返,早二疊世初結束造山,進入造山后伸展階段,該階段形成大量的鎂鐵-超鎂鐵質雜巖和巖漿硫化物礦床及巖漿熱液型金礦床(Qinetal., 2002; 孫赫, 2009),徐興旺等(1998)則認為碰撞造山擠壓-伸展轉變期是韌性剪切帶型金礦和巖漿銅鎳硫化物礦的大規模成礦期。

圖10 圪塔山口巖體TiO2-10MnO-10P2O5圖解(底圖據Mullen, 1983)OIT-大洋島弧拉斑玄武巖;OIA-大洋島弧堿性玄武巖;MORB-洋中脊玄武巖;IAT-島弧拉斑玄武巖;CAB-鈣堿性玄武巖Fig.10 The diagram of TiO2-10MnO-10P2O5 for Getashankou intrusions (after Mullen, 1983)OIT-oceanic island tholeiite; OIA-oceanic island alkalibasalt; MORB-mid-oceanic ridge basalt; IAT-island arc tholeiite basalt; CAB-calc-alkaline basalt

對東天山地區古洋盆閉合時限及古大洋的俯沖方向的認識也不盡相同。Qinetal.(2002,2005,2009)、孫赫(2009)通過對礦床成礦時代的演化研究,認為東天山地區從中泥盆到晚石炭世處于洋殼的俯沖階段,早二疊世處于造山后的伸展階段。而毛啟貴等(2006)、Xiaoetal.(2008)、Aoetal.(2010)則認為俯沖作用一直持續到三疊紀。關于俯沖方向的爭論主要有:北天山次大洋向塔里木板塊和準噶爾板塊雙向俯沖(姬金生等,1994)、北天山次大洋或古亞洲洋向北俯沖(Xiaoetal., 2004, 2008; 胡克兵等, 2008)、準噶爾大洋板塊向南俯沖、南天山洋向北俯沖(秦克章,2000;唐冬梅等,2009b;Suetal., 2012)。中天山白石泉與東天山地區其它鎂鐵-超鎂鐵質巖體巖漿具有從拉斑玄武巖向鈣堿性玄武巖過渡的巖漿演化趨勢(孫赫等,2006)。本文采用TiO2-10MnO-10P2O5圖來判別圪塔山口巖體產出的構造環境,結果如圖10所示,樣品多落于鈣堿性區及島弧拉斑玄武巖區,顯示出與東天山其它巖體具有相同的構造特征。研究表明從東天山覺羅塔格構造帶中鎂鐵-超鎂鐵質巖體經中天山北緣白石泉、天宇巖體到中天山地塊南緣的北山地區鎂鐵-超鎂鐵質巖體,俯沖板片混染的程度由強變弱(Zhouetal., 2004; 孫赫等, 2006; Chaietal., 2008; 唐冬梅等, 2009b; 姜常義等, 2006; 蘇本勛等, 2010; Suetal., 2012)。因此本文支持東天山地區準噶爾古大洋板塊向南(天山)俯沖。

圖11 東天山-北山一帶及塔里木玄武巖成巖年齡對比圖(據Qin et al., 2011補充修改)Fig.11 Compiled age data of basalts and mafic/ultramafic dikes/intrusions in Tarim Basin, eastern Tianshan and Beishan (revised after Qin et al., 2011)

東天山地區的鎂鐵-超鎂鐵質巖體的形成是否與地幔柱活動有關也是爭論的熱點之一。許多學者認為東天山地區存在早二疊世地幔柱活動(Zhouetal., 2004; 毛景文等, 2006; Maoetal., 2008; Pirajnoetal., 2008; 徐學義等, 2009; Qinetal., 2011; Suetal., 2011; 李文淵等, 2012),并認為東天山的鎂鐵巖帶中鎳銅礦床的形成與地幔柱活動有關,如Qinetal.(2011)通過年代學與Sr-Nd同位素研究表明二者可能具有成因上的聯系,并認為二疊世碰撞后伸展背景下的地幔柱疊加作用是形成東天山和北山鎂鐵-超鎂鐵質巖帶的主要原因。但同時也有學者認為東天山地區鎂鐵-超鎂鐵質巖體的形成與地幔柱無關,如鄧宇峰等(2011)通過對黃山西巖體的研究,認為其巖漿源區與地幔柱活動無關。

圪塔山口巖體的主微量元素特征表明其具島弧玄武巖的特征,而不同于李文鉛等(2000)中康古爾塔格蛇綠巖的洋中脊環境,同時圪塔山口巖體的地質特征也表明其為幔源巖漿沿構造裂隙上侵的產物。因此本文認為東天山地區的鎂鐵-超鎂鐵質巖體不是縫合帶蛇綠巖,而是造山后伸展階段幔源巖漿上侵的產物。其成巖年齡282.6±1.9Ma,不僅與東天山一帶其它巖體成巖時代一致,而且與北山地區鎂鐵-超鎂鐵質巖體形成時代相同。如坡北輝長巖鋯石U-Pb年齡274~289Ma(姜常義等,2006;李華芹等,2006,2009),羅東巖體283~284Ma(孫赫等, 2010; Aoetal., 2010),筆架山、紅石山巖體SIMS鋯石U-Pb年齡依次為279Ma、280Ma(Qinetal., 2011)。說明東天山-北山地區在270~290Ma,尤其在275~285Ma間發育了大規模的巖漿活動,同時這一年齡范圍也與塔里木地區玄武巖及鎂鐵質巖墻形成時代一致(圖11)。因此,從形成時代上來看,東天山-北山地區鎂鐵-超鎂鐵質巖體的形成可能與塔里木大火成巖省巖漿活動有關。全巖Sr-Nd同位素、鋯石Hf同位素和全巖主、微量地球化學數據也顯示東天山-北山鎂鐵-超鎂鐵質侵入巖與塔里木火山巖有成因聯系(Qinetal., 2011; Suetal., 2011)。圪塔山口鎂鐵-超鎂鐵巖體的全巖主、微量元素特征、Ni-Cu成礦特征及形成時代與東天山已知的與鎂鐵-超鎂鐵質巖體相關的鎳銅硫化物礦床都非常相似,所以地幔柱活動及其作用是否影響到東天山更東段巖體及成礦有待進一步深入研究。

6 結論

(1)輝長巖鋯石U-Pb測年結果表明新近發現的圪塔山口鎂鐵-超鎂鐵質巖體的形成年齡為282.6±1.9Ma,為早二疊世,與東天山-北山地區的鎂鐵-超鎂鐵質巖體形成時代一致,同時也與塔里木盆地的玄武巖與鎂鐵質巖墻的時代相同。

(2)圪塔山口巖體是具有虧損地幔特征的鈣堿性玄武質巖漿在以結晶分異作用為主導,與殼源物質混染綜合作用下的產物,巖體具有較好的鎳銅礦成礦潛力。

(3)東天山鎂鐵-超鎂鐵質巖體形成于古大洋板塊向南俯沖結束后的造山后伸展背景,其形成可能與地幔柱疊加作用相關。

致謝野外工作得到了新疆有色地勘局704隊雷剛副總工、康峰高工,圪塔山口(頭蘇泉)項目部楊陽、席斌斌、馬新星、楊寶新等的支持與幫助;SIMS鋯石U-Pb年齡測試得到中國科學院地質與地球物理研究所李獻華研究員等的支持;兩位匿名審稿人對論文的修改提出了寶貴的建議;在此一并致以衷心的感謝。

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