本文選題：朱溪鎢礦 + 白鎢礦�。� 參考：《地學(xué)前緣》2017年05期

【摘要】：贛東北朱溪超大型鎢礦床是目前世界上最大的夕卡巖型鎢礦床,為確定其成礦物質(zhì)來源及成礦時代,在詳細鉆孔巖心編錄基礎(chǔ)上,本文對白鎢礦運用LA-ICP-MS法分析了其單礦物的微量元素、稀土元素,并進行Sm-Nd同位素定年研究。結(jié)果顯示:白鎢礦微量元素中Mo、Nb、Ta富集,而Rb/Sr0.04,Nb/Ta=1.69~8.46、Zr/Hf=3.06~6.75,顯示成礦物質(zhì)的殼源特征。白鎢礦的∑REE變化大(∑REE=3.25×10~(-6)~229.95×10~(-6)),LREE與HREE之間分餾明顯((La/Yb)N=36~19 984),屬于輕稀土富集型。依據(jù)δEu值的特征,將白鎢礦分為δEu正異常(δEu=1.44~9.06)的輕稀土富集型和δEu負異常(δEu=-0.25~-0.82)的輕稀土富集型;在空間上,由遠到近接近花崗巖,白鎢礦的∑REE逐漸升高,δEu由正異常逐漸轉(zhuǎn)變?yōu)樨摦惓?有與花崗巖稀土配分曲線趨于一致的趨勢。白鎢礦Sm-Nd等時線年齡為(144±5)Ma,143 Nd/144 Nd初始比值為0.512 020,其εNd(t)為-9.753,二階段模式年齡為1 745 Ma,其年齡與物質(zhì)來源與朱溪花崗巖的一致,表明朱溪鎢礦床是朱溪礦區(qū)隱伏花崗巖進一步演化的產(chǎn)物。
[Abstract]:The Zhuxi super large tungsten deposit in northeastern Jiangxi is the largest skarn type tungsten deposit in the world at present. In order to determine its source of ore-forming material and metallogenic epoch, it is based on the detailed cataloguing of borehole cores. In this paper, the trace elements and rare earth elements of Scheelite are analyzed by LA-ICP-MS method, and the Sm-Nd isotopic dating is carried out. The results show that Mo-NbPn-Ta is enriched in wolframite trace elements, while RB / Sr0.04Nb / Ta 1.69Nb / Ta 1.69nb / HF 3.06C 6.75, which shows the crustal characteristics of the ore-forming materials. The 鈭，

本文編號：1879371