西藏努日銅鎢鉬礦床地質(zhì)特征及成礦物質(zhì)來源探討
發(fā)布時間：2018-07-28 19:18
【摘要】：努日銅鎢鉬礦床位于岡底斯燕山—喜馬拉雅期陸緣巖漿弧的東段、雅魯藏布江板塊縫合帶北緣。礦體受礦區(qū)復式背斜控制,賦存在背斜與向斜共翼地段的比馬組四段(K1b4)的層間破碎和節(jié)理裂隙帶內(nèi)。共圈定12個礦體,主要是為似層狀、透鏡狀和脈狀。礦石礦物主要是黃銅礦、輝鉬礦、白鎢礦,中-細粒自形半自形結(jié)構(gòu)為主,浸染狀、斑點狀、塊狀構(gòu)造。脈石礦物包括石榴子石、綠簾石、石英及極少量的方解石。輝鉬礦微量元素表現(xiàn)為高場強元素(HFSE)虧損,LREE富集。輝鉬礦中Y/Ho、Zr/Hf、Nb/Ta的比值變化范圍較大,表明主成礦期成礦流體混入了外來流體,總體以早期成礦流體的物理化學性質(zhì)為主。右傾稀土配分模式,負Eu異常和負Ce異常。負Eu異常可能是巖漿在分離結(jié)晶中大量斜長石晶出,使原始流體強烈虧損Eu;負Ce異�？赡苁且驗槌跏剂黧w為氧化環(huán)境,致使Ce3+氧化為Ce4+從而與稀土體系分離。白鎢礦微量元素表現(xiàn)為虧損高場強元素(HFSE),富集LREE。Hf/Sm、Th/La、Nb/La比值范圍都遠低于1,而Y/Ho、Zr/Hf、Nb/Ta比值變化范圍較大,暗示努日礦床的成礦流體總體以富Cl熱液為主。在主成礦期不同程度混入了外來流體,總體特征仍以早期成礦流體的物理化學性質(zhì)為主。ΣREE不高,右傾配分模式,稀土元素結(jié)構(gòu)單一,特征值變化小,指示白鎢礦中REE具有高度同源性。而弱δEu負異常,基本未見Ce異�；驑O弱的正Ce異常,很大程度上代表了成礦流體的還原環(huán)境特征。石榴子石及石英中流體包裹體?18OH2O值為-2.96~7.14‰。成礦熱液主體為巖漿,遷移中接收了天水,熱液由原生巖漿水逐漸過渡到原生巖漿水和天水的混合。硫化物的δ34S值波動很小,多為正值,偶見負值,典型塔式分布,向正值偏移。表明硫同位素均一化程度高,硫同位素沒有強烈分餾,暗示硫的來源相對單一。鉛同位素特征值均小于9.58,介于上地殼和地幔之間,指示出努日礦床成礦物質(zhì)主要來源于幔源,在運移過程中可能混入了部分殼源物質(zhì)。結(jié)合Re同位素綜合分析發(fā)現(xiàn),努日銅鉬鎢礦床的成礦物質(zhì)中Mo可能來源于單一的深部幔源。而白鎢礦則可能為來源于深部殼源巖漿結(jié)晶分異后富鎢流體沿著構(gòu)造裂隙運移過程中與圍巖比馬組地層發(fā)生接觸交代反應(yīng),最終導致Ca2+與WO3-4結(jié)合形成了白鎢礦。而成礦熱液則主要為初始原生巖漿水逐漸過渡到原生巖漿水和天水的混合流體。S同位素結(jié)構(gòu)較為單一,表明S的主要來源還是巖漿。Pb同位素顯示礦床Pb為不含放射成因的普通鉛,為混合源。
[Abstract]:The Nuri copper tungsten molybdenum deposit is located in the eastern section of the magma arc of the Yanshan Himalaya continental margin of Gangdise and the northern margin of the Yarlung Zangbo Suture Zone. The ore body is controlled by the compound anticline in the mining area, and there are four segments of the Bi Ma formation (K1b4) of the anticline and Syncline in the interlayer breakup and the joint fracture zone. The 12 ore bodies are delineated, mainly as stratiform and permeable. The ore minerals are mainly chalcopyrite, molybdenite, scheelite, medium to fine self shaped semi self shaped structure, disseminated, speckled and massive structures. The gangue minerals include pomegranite, epidote, quartz and a very small amount of calcite. The trace elements of the molybdenite are HFSE loss, LREE enrichment, Y/Ho and Zr/ in molybdenite. The ratio of Hf and Nb/Ta varies greatly, indicating that the ore-forming fluid in the main metallogenic period is mixed with foreign fluid, and the overall physical and chemical properties of the early metallogenic fluid are mainly. The right rare earth distribution pattern, negative Eu anomaly and negative Ce anomaly. The negative Eu anomaly may be a large number of diagonal feldspar crystals in the crystallization of the magma, causing a strong loss of Eu in the original fluid and negative Ce difference. It is often due to the oxidation environment of the initial fluid, resulting in the oxidation of Ce3+ to Ce4+ to separate the rare earth system. The trace elements of the scheelite are characterized by a loss of high field strength element (HFSE), the concentration of LREE.Hf/Sm, Th/La, Nb/La ratio is far below 1, while the Y/Ho, Zr/Hf, and Nb/Ta ratios vary greatly, suggesting that the ore-forming fluid in the Nu day deposit is generally rich in C. In the main metallogenic period, l has been mixed with foreign fluids in different degrees. The overall characteristics are still dominated by the physical and chemical properties of the early metallogenic fluid. The sigma REE is not high, the right distribution pattern, the rare earth element structure is single, the change of the eigenvalues is small, indicating that the REE is highly homologous in the scheelite, and the weak Delta Eu is negative, and there is no Ce anomaly or extremely weak. The normal Ce anomaly, to a great extent, represents the reduction environment of the ore-forming fluid. The fluid inclusion in the garnet and quartz is -2.96~7.14 per 1000. The main body of the hydrothermal fluid is -2.96~7.14 per thousand. The main body of the hydrothermal fluid is magma, and the transfer of the hydrothermal fluid from the primary rock to the mixture of primary rock and Tianshui. For positive, negative, negative, negative, typical tower distribution, migration to positive value. It shows that the isotopes of sulfur isotopes are high and sulfur isotopes have no strong fractionation, suggesting that the source of sulfur is relatively simple. The characteristics of lead isotopes are less than 9.58, between the upper crust and the mantle, indicating that the ore-forming minerals are mainly derived from the mantle source and can be transported during the migration process. In combination with Re isotopic analysis, it is found that Mo may be derived from a single deep mantle source in the metallogenic material of the Nuri copper molybdenum tungsten deposit, while the scheelite may be derived from the contact of the rich tungsten rich fluid in the process of tectonic fissures in the process of tectonic fractures. The reaction eventually leads to the combination of Ca2+ and WO3-4 to form scheelite, and the metallogenic hydrothermal solution is mainly a single primary primary rock slurry that gradually transitioning to primary rock water and Tianshui. The.S isotope structure of the mixed fluid is relatively simple, indicating that the main source of S is that the.Pb isotope of the magma deposit shows that Pb is a common lead without radioactive origin and is a mixed source.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.6;P618.41
本文編號：2151322
[Abstract]:The Nuri copper tungsten molybdenum deposit is located in the eastern section of the magma arc of the Yanshan Himalaya continental margin of Gangdise and the northern margin of the Yarlung Zangbo Suture Zone. The ore body is controlled by the compound anticline in the mining area, and there are four segments of the Bi Ma formation (K1b4) of the anticline and Syncline in the interlayer breakup and the joint fracture zone. The 12 ore bodies are delineated, mainly as stratiform and permeable. The ore minerals are mainly chalcopyrite, molybdenite, scheelite, medium to fine self shaped semi self shaped structure, disseminated, speckled and massive structures. The gangue minerals include pomegranite, epidote, quartz and a very small amount of calcite. The trace elements of the molybdenite are HFSE loss, LREE enrichment, Y/Ho and Zr/ in molybdenite. The ratio of Hf and Nb/Ta varies greatly, indicating that the ore-forming fluid in the main metallogenic period is mixed with foreign fluid, and the overall physical and chemical properties of the early metallogenic fluid are mainly. The right rare earth distribution pattern, negative Eu anomaly and negative Ce anomaly. The negative Eu anomaly may be a large number of diagonal feldspar crystals in the crystallization of the magma, causing a strong loss of Eu in the original fluid and negative Ce difference. It is often due to the oxidation environment of the initial fluid, resulting in the oxidation of Ce3+ to Ce4+ to separate the rare earth system. The trace elements of the scheelite are characterized by a loss of high field strength element (HFSE), the concentration of LREE.Hf/Sm, Th/La, Nb/La ratio is far below 1, while the Y/Ho, Zr/Hf, and Nb/Ta ratios vary greatly, suggesting that the ore-forming fluid in the Nu day deposit is generally rich in C. In the main metallogenic period, l has been mixed with foreign fluids in different degrees. The overall characteristics are still dominated by the physical and chemical properties of the early metallogenic fluid. The sigma REE is not high, the right distribution pattern, the rare earth element structure is single, the change of the eigenvalues is small, indicating that the REE is highly homologous in the scheelite, and the weak Delta Eu is negative, and there is no Ce anomaly or extremely weak. The normal Ce anomaly, to a great extent, represents the reduction environment of the ore-forming fluid. The fluid inclusion in the garnet and quartz is -2.96~7.14 per 1000. The main body of the hydrothermal fluid is -2.96~7.14 per thousand. The main body of the hydrothermal fluid is magma, and the transfer of the hydrothermal fluid from the primary rock to the mixture of primary rock and Tianshui. For positive, negative, negative, negative, typical tower distribution, migration to positive value. It shows that the isotopes of sulfur isotopes are high and sulfur isotopes have no strong fractionation, suggesting that the source of sulfur is relatively simple. The characteristics of lead isotopes are less than 9.58, between the upper crust and the mantle, indicating that the ore-forming minerals are mainly derived from the mantle source and can be transported during the migration process. In combination with Re isotopic analysis, it is found that Mo may be derived from a single deep mantle source in the metallogenic material of the Nuri copper molybdenum tungsten deposit, while the scheelite may be derived from the contact of the rich tungsten rich fluid in the process of tectonic fissures in the process of tectonic fractures. The reaction eventually leads to the combination of Ca2+ and WO3-4 to form scheelite, and the metallogenic hydrothermal solution is mainly a single primary primary rock slurry that gradually transitioning to primary rock water and Tianshui. The.S isotope structure of the mixed fluid is relatively simple, indicating that the main source of S is that the.Pb isotope of the magma deposit shows that Pb is a common lead without radioactive origin and is a mixed source.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.6;P618.41
【參考文獻】
相關(guān)期刊論文 前4條
1 陳雷;秦克章;李光明;肖波;李金祥;江化寨;陳金標;趙俊興;范新;韓逢杰;黃樹峰;琚宜太;;西藏山南努日銅鉬鎢礦床矽卡巖地球化學特征及成因[J];地質(zhì)與勘探;2011年01期
2 姚鵬,鄭明華,彭勇民,李金高,粟登奎,范文玉;西藏岡底斯島弧帶甲馬銅多金屬礦床成礦物質(zhì)來源及成因研究[J];地質(zhì)論評;2002年05期
3 閆學義;黃樹峰;杜安道;;岡底斯?jié)僧敶笮玩u銅鉬礦Re-Os年齡及陸緣走滑轉(zhuǎn)換成礦作用[J];地質(zhì)學報;2010年03期
4 黃智龍;幔源巖漿活動過程中的去氣作用——以云南老王寨金礦煌斑巖為例[J];礦物巖石地球化學通報;2001年01期
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