本文關(guān)鍵詞： 朱溪鎢礦 矽卡巖型礦床 富氟流體 榍石和磷灰石U-Pb定年稀土配分特　出處：《南京大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：江西朱溪鎢礦是一個(gè)近年新發(fā)現(xiàn)的超大型鎢礦床,它位于于江南造山帶的東部。朱溪礦區(qū)現(xiàn)已探明鎢資源儲量286萬噸,超越之前報(bào)道106萬噸儲量的大湖塘鎢礦,再次刷新了鎢礦儲量規(guī)模的世界記錄,成為新的世界最大鎢礦。朱溪世界級超大型鎢礦床的發(fā)現(xiàn)對鎢礦產(chǎn)資源開發(fā)和鎢礦床研究均具有重要的意義。目前對于朱溪矽卡巖型白鎢礦礦床的巖相學(xué)、礦物學(xué)的基礎(chǔ)研究還比較薄弱,成礦年齡還沒有精確的年代學(xué)數(shù)據(jù)約束。本文在總結(jié)前人研究的基礎(chǔ)上,對朱溪鎢礦矽卡巖礦物的礦物成分進(jìn)行了分析,并且利用LA-ICP-MS對朱溪礦石中的榍石、磷灰石通過原位U-Pb定年方法獲得了白鎢礦的成礦年齡,對朱溪鎢礦的成礦年齡和時(shí)代進(jìn)行了探討。朱溪鎢礦礦體主要產(chǎn)于燕山期侵入巖與碳酸鹽巖接觸帶的矽卡巖或矽卡巖化大理巖中。對鉆孔采集到的花崗巖樣品進(jìn)行巖石地球化學(xué)研究表明,朱溪礦區(qū)黑云母花崗巖具有高硅、富堿,高分異的特征,屬于鈣堿性、過鋁質(zhì)花崗巖。黑云母花崗巖微量元素中Rb、U、Ta等元素富集,以及Ba、Nb、Sr和Ti等元素虧損。稀土元素總量偏低,輕稀土相對富集。根據(jù)礦物共生組合和交代關(guān)系,朱溪矽卡巖型白鎢礦成礦劃分為早矽卡巖階段、晚矽卡巖階段、石英硫化物階段。矽卡巖礦物的電子探針分析結(jié)果表明,石榴子石主要為鈣鋁榴石-鈣鐵榴石端元組分;單斜輝石以透輝石-鈣鐵輝石系列為主。與白鎢礦密切共生的矽卡巖礦物螢石、符山石、磷灰石和榍石為富氟的礦物,表明朱溪鎢礦成礦流體為富氟體系,這有利于鎢的運(yùn)移和沉淀。利用LA-ICP-MS對白鎢礦進(jìn)行的原位分析,對朱溪鎢礦中白鎢礦中微量元素和稀土元素進(jìn)行了詳細(xì)的研究。根據(jù)白鎢礦REE元素配分特征,將朱溪鎢礦礦化劃分為兩個(gè)大的階段,兩個(gè)階段成礦流體性質(zhì)明顯不同,所反應(yīng)的環(huán)境也不同,第Ⅰ階段環(huán)境為氧化環(huán)境,第Ⅱ階段則是從還原環(huán)境過渡到氧化環(huán)境。第Ⅱ階段應(yīng)是主要成礦階段,形成了朱溪鎢礦的主體�？傮w上,朱溪矽卡巖型白鎢礦呈現(xiàn)輕稀土富集的稀土配分模式,這可能是由于石榴子石等富集重稀土的礦物沉淀導(dǎo)致白鎢礦重稀土的虧損。通過榍石原位LA-ICP-MS U-Pb定年測得成礦年齡為154±3Ma,磷灰石LA-ICP-MSU-Pb定年結(jié)果:137±9Ma～148± 16Ma,屬于燕山期,與前人測得的成巖年齡在誤差范圍內(nèi)基本一致,表明成礦作用與華南燕山期巖漿活動密切相關(guān)。
[Abstract]:The Zhuxi tungsten deposit in Jiangxi Province is a newly discovered super-large tungsten deposit in recent years. It is located in the eastern part of the Jiangnan orogenic belt. The Zhuxi mining area now has proven tungsten reserves of 2.86 million tons, surpassing the previously reported 1.06 million tons of Dahutang tungsten deposit. Set a new world record for the size of tungsten reserves, The discovery of Zhuxi world-class tungsten deposit is of great significance to the development of tungsten mineral resources and the study of tungsten deposit. The basic study of mineralogy is still weak, and the metallogenic age is not yet constrained by the exact chronological data. Based on the previous studies, the mineral composition of skarn minerals in Zhuxi tungsten deposit is analyzed in this paper. The metallogenic age of scheelite was obtained by in situ U-Pb dating of sphene and apatite from Zhuxi ore by LA-ICP-MS. The metallogenic age and age of Zhuxi tungsten deposit are discussed. The orebody of Zhuxi tungsten deposit mainly occurs in skarn or skarn marble in the contact zone between intrusive rocks and carbonate rocks in Yanshanian period. The study of geochemistry shows that, Biotite granites in Zhuxi mining area are characterized by high silicon, high alkali and high differentiation. They belong to calc-alkaline and peraluminous granites. The biotite granites are enriched in trace elements such as RbCU, Ta, and the depletion of elements such as Baan, NbSr, Ti, etc. The total amount of rare earth elements is relatively low. According to the mineral symbiotic assemblage and metasomatism, the scheelite deposits in Zhuxi skarn type are divided into early skarn stage, late skarn stage and quartz sulfide stage. The pomegranate is mainly composed of calcium aluminite and calcium iron garnet, and the clinopyroxene is mainly diopside-calcium ferrite series. The skarn minerals fluorite, talisite, apatite and sphene are fluorine-rich minerals closely associated with scheelite. The results show that the ore-forming fluid of Zhuxi tungsten deposit is a fluorine-rich system, which is beneficial to the migration and precipitation of tungsten. The in-situ analysis of scheelite is carried out by LA-ICP-MS. The trace elements and rare earth elements of scheelite in Zhuxi tungsten mine are studied in detail. According to the partition characteristics of REE elements in scheelite, the mineralization of Zhuxi tungsten deposit is divided into two major stages, and the ore-forming fluid properties of the two stages are obviously different. The reaction environment is also different, the first stage is oxidation environment, the second stage is transition from reducing environment to oxidizing environment, the second stage should be the main metallogenic stage, forming the main body of Zhuxi tungsten deposit. The zhuxi skarn type scheelite presents a rare earth distribution pattern of LREE enrichment. This may be due to the depletion of heavy rare earths in scheelite as a result of precipitation of heavy rare earths such as pomegranate. The metallogenic age measured by LA-ICP-MSU-Pb dating of sphene in situ is 154 鹵3 Ma. and the age of apatite LA-ICP-MSU-Pb is: 137 鹵9 Ma-148 鹵16 Ma. which belongs to Yanshanian period. It is consistent with the previous diagenetic ages in the error range, indicating that the mineralization is closely related to the Yanshanian magmatism in South China.
【學(xué)位授予單位】：南京大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P618.67

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