本文關(guān)鍵詞： 輝綠巖 SIMS 矽卡巖礦床 維寶 祁漫塔格 東昆侖　出處：《地質(zhì)學(xué)報(bào)》2017年04期 　論文類型：期刊論文

【摘要】：東昆侖造山帶海西期-印支期巖漿活動(dòng)強(qiáng)烈,不僅出露大規(guī)模的中酸性侵入體,還發(fā)育數(shù)量較多的輝綠巖脈(墻)。相對于中酸性侵入體,目前對輝綠巖脈(墻)的研究還較薄弱。本文對新疆維寶多金屬礦區(qū)輝綠巖脈進(jìn)行了年代學(xué)和地球化學(xué)研究,確定了其形成時(shí)代,探討了其形成的構(gòu)造背景和巖石成因。SIMS鋯石U-Pb測年結(jié)果顯示:維寶多金屬礦區(qū)輝綠巖形成于227.5±3.3Ma(1σ,MSWD=2.0),為晚三疊世。結(jié)合尚未發(fā)表的年代學(xué)資料,將維寶矽卡巖礦床成礦母巖侵位時(shí)間限定于232~227.5Ma之間,這一范圍與祁漫塔格矽卡巖多金屬礦床成礦母巖就位的峰期年齡一致。主量元素組成上,這些輝綠巖高SiO_2、K_2O,低MgO、Al_2O_3、CaO、FeO和Na_2O,大部分為鈣堿性巖;輕重稀土元素分餾強(qiáng),LaN/YbN5,大部分樣品δEu介于0.73和0.77之間,因此在稀土元素配分曲線上表現(xiàn)為具有明顯Eu負(fù)異常的右傾型配分模式;在微量元素蛛網(wǎng)圖上,相對于原始地幔選擇性富集大離子親石元素(如LREE)、虧損高場強(qiáng)元素(如Ti、P元素等)。盡管維寶多金屬礦區(qū)輝綠巖地球化學(xué)組成具有弧巖漿巖的特征,但根據(jù)區(qū)域構(gòu)造演化歷史,本文認(rèn)為維寶礦區(qū)輝綠巖形成于后碰撞拉伸環(huán)境。其稀土和微量元素所顯示的弧巖漿特征可能來源于早期俯沖物質(zhì)對源區(qū)的混染。印支晚期東昆侖祁漫塔格地區(qū)幔源巖漿底侵作用導(dǎo)致下地殼部分熔融并分異出長英質(zhì)巖漿,二者在上升過程中發(fā)生混合作用并最終在維寶礦區(qū)形成時(shí)代接近、稀土和微量元素組成相似的花崗閃長巖和輝綠巖脈。
[Abstract]:The Hercynian-Indosinian magmatic activity in the East Kunlun orogenic belt is strong, resulting in not only massive intermediate-acid intrusions, but also a large number of diabase veins (Dianhuo), as opposed to intermediate-acid intrusions. At present, the study of diabase veins (dikes) is still relatively weak. In this paper, chronological and geochemical studies of diabase veins in Weibao polymetallic ore area, Xinjiang, have been carried out, and their forming times have been determined. The zircon U-Pb dating results from the tectonic setting and the petrogenesis of SIMS show that the diabase of the Weibao polymetallic ore area was formed in 227.5 鹵3.3 Mai 1 蟽 and MSWD 2. 0, which belongs to the late Triassic. Combined with the unpublished geochronological data, the zircon U-Pb dating shows that the diabase was formed in the Weibao polymetallic ore area. The emplacement time of ore-forming parent rock of Weibao skarn deposit is limited to 2322 ~ 227.5Ma, which is consistent with the peak age of metallogenic mother rock emplacement of Qimantage skarn polymetallic deposit. These diabase rocks have high SiO2K2Os, low MgOAl2O3CaO2OFeO and Na2Os, mostly calc-alkaline rocks, and heavy REE fractionation strong fractionation of LaN- / YbN5, most of which are between 0.73 and 0.77, so the REE distribution curve shows a right-dip pattern with obvious negative EU anomalies. In the trace element cobweb map, relative to the original mantle selective enrichment of large ion lithophile elements (such as LREEN), depleted high field strength elements (such as Tip elements, etc.), although the geochemical composition of diabase in the Weibao polymetallic ore area is characterized by arc magmatic rocks, But according to the history of regional tectonic evolution, In this paper, it is suggested that diabase was formed in the post-collisional extensional environment in Weibao mining area. The arc magma characteristics of rare earth elements and trace elements may be derived from the mixing of subduction materials to the source region. Qimantage area, East Kunlun, East Kunlun, Indosinian late Indosinian region. Mantle-derived magma underplating leads to partial melting of the lower crust and differentiation of felsic magma. They were mixed in the process of rising and finally formed in Weibao ore area. The granodiorite and diabase veins with similar composition of rare earth elements and trace elements were formed in Weibao mine area.
【作者單位】： 中國地質(zhì)科學(xué)院礦產(chǎn)資源研究所國土資源部成礦作用與資源評價(jià)重點(diǎn)實(shí)驗(yàn)室;
【基金】：國土資源部公益性行業(yè)科研專項(xiàng)經(jīng)費(fèi)項(xiàng)目(編號:201411025) 中國地質(zhì)調(diào)查局地質(zhì)調(diào)查項(xiàng)目(編號:1212011085528);中國地質(zhì)調(diào)查局高層次地質(zhì)人才培養(yǎng)計(jì)劃(編號:201309) 青年地質(zhì)英才計(jì)劃(編號:201112)資助的成果
【分類號】：P597.3;P618.2

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