云南省金寶山基性—超基性雜巖體特征及找礦遠(yuǎn)景
發(fā)布時(shí)間：2018-10-10 17:00
【摘要】：云南省彌渡縣金寶山鉑鈀礦是我國最大的獨(dú)立鉑族元素礦床,其礦床成因類型屬典型的巖漿熔離型銅鎳硫化物鉑族元素礦床,該礦床主要賦存于金寶山基性-超基性雜巖體內(nèi),因此,對(duì)金寶山基性-超基性雜巖體的深入研究具有重要的理論意義和實(shí)際意義。金寶山雜巖體大地構(gòu)造位于揚(yáng)子地臺(tái)西南緣,其西距哀牢山構(gòu)造帶不到5km。本文在野外區(qū)域地質(zhì)調(diào)查、礦區(qū)地質(zhì)調(diào)查、巖體實(shí)測(cè)地質(zhì)剖面及系統(tǒng)的巖礦樣品采集的基礎(chǔ)上,結(jié)合室內(nèi)鏡下光薄片鑒定、電子探針分析、地球化學(xué)分析及SHRIMP鋯石U-Pb測(cè)年等方法對(duì)金寶山基性-超基性雜巖體的巖體特征進(jìn)行了深入研究。研究認(rèn)為,金寶山雜巖體整體蝕變強(qiáng)烈,巖石類型主要包括基性巖和超基性巖兩大類,基性巖主要為蝕變輝長(zhǎng)巖和輝綠巖,超基性巖主要為輝石橄欖巖。鉑族元素主要賦存于超基性巖中,而基性巖內(nèi)幾乎不含礦,因此本文側(cè)重對(duì)金寶山雜巖體中的超基性巖進(jìn)行了重點(diǎn)研究。金寶山超基性輝石橄欖巖礦物組成主要為橄欖石和斜方輝石,且以貴橄欖石(Fo分子百分?jǐn)?shù)在84~86之間)和古銅輝石(En分子百分?jǐn)?shù)在83~89之間)為主,其次為鈣鎂橄欖石、單斜輝石、透輝石、鉻鐵礦、角閃石、黑云母等,由于巖體蝕變強(qiáng)烈,巖體內(nèi)還發(fā)育大量的葉蛇紋石、纖蛇紋石等。金寶山超基性巖主量元素分析結(jié)果顯示,SiO2含量32.5%~40.52%,MgO含量29.95%~36.32%,TFeO含量7.31%~20.19%,Al2O3含量1.41%~5.90%,TiO2含量0.36%~1.53%,P2O5含量0.03%~0.17%,CaO含量0.14%~5.05%,K2O含量0.05%~0.22%,Na2O含量0.01%~0.51%,MnO含量0.09%~0.20%,m/f比值為3.06~5.98,屬鐵質(zhì)超鎂鐵巖,主量元素特征顯示雜巖體屬亞堿性大陸拉斑玄武巖系列。巖石的固結(jié)指數(shù)(SI)56.87%~82.81%,鎂鐵指數(shù)(MF)16.79%~43.00%。其中不含礦的輝石橄欖巖與含礦的輝石橄欖巖相比,巖石的固結(jié)指數(shù)(SI)偏小,鎂鐵指數(shù)(MF)偏大。金寶山超基性巖稀土元素分析結(jié)果顯示,巖體中稀土含量總體較高,其中LREE含量15.36×10-6~37.77×10-6,HREE含量2.32×10-6~4.86×10-6,輕重稀土Σw(Ce)/Σw(Y)比值為4.35~7.97,稀土元素配分圖呈明顯的右傾型,反映了巖漿作用晚期發(fā)生了較強(qiáng)烈的分餾作用。金寶山超基性巖δEu比值為0.43~1.11,平均比值為0.74,稀土元素配分圖顯示銪虧損明顯,反映金寶山雜巖體負(fù)銪異常特征明顯。[w(La)/w(Sm)]N比值為1.70~3.32,指示其巖漿來源為富集型地幔。微量元素分析結(jié)果顯示,雜巖體中強(qiáng)不相容元素如Rb、U、Th、Ta、Nb、La、Ce等相對(duì)于弱不相容元素如Zr、Hf、Sm、Ti、Y、Yb、Lu等明顯富集,而K、Ba、P、Y、Yb虧損明顯,Sr虧損強(qiáng)烈,主要是斜長(zhǎng)石的結(jié)晶分異造成。Nb/La比值為0.47~1.21,Nb/Ce比值為0.21~0.51,Lu/Yb比值為0.10~0.18,Zr/Hf比值為24.00~39.78,Nb/Ta比值為5.99~29.08,與原始地幔和MORB的相應(yīng)比值對(duì)比差距較大,指示地殼混染程度較強(qiáng)。金寶山雜巖體形成時(shí)代約260Ma,原始巖漿上侵過程中遭受了地殼物質(zhì)同化混染,并促進(jìn)硫化物發(fā)生熔離。鉑族元素硫化物礦物主要賦存于海綿隕鐵構(gòu)造、浸染狀構(gòu)造等巖漿熔離階段形成的礦石中,因此巖漿熔離作用是導(dǎo)致鉑族元素富集成礦的重要因素。金寶山超基性巖巖性為古銅輝石橄欖巖,且Fo與En相近,巖石含礦性總體較好。金寶山礦床中的鉑族元素主要以硫化物形式賦存在巖體中,而超基性巖中MgO的含量特征顯示其屬高溫?zé)o硫化物系列,巖體中硫化物含量較少,因此金寶山超基性巖中的鉑族元素品位較低。金寶山雜巖體以西及哀牢山以東的德苴一帶發(fā)育晚二疊世的中-基性火山巖帶,帶內(nèi)玄武巖屬于大陸拉斑玄武巖系列,與金寶山雜巖體地球化學(xué)特征一致,該火山巖帶形成于晚二疊世哀牢山洋殼向西俯沖而誘發(fā)的后側(cè)揚(yáng)子地臺(tái)邊緣發(fā)生伸展作用所形成的揚(yáng)子地臺(tái)邊緣裂陷槽,金寶山雜巖體微量元素特征顯示金寶山基性-超基性雜巖體產(chǎn)于活動(dòng)大陸邊緣內(nèi)的裂谷活動(dòng)。因此,金寶山基性-超基性雜巖體與該陸緣裂陷槽具有成因上的關(guān)系。結(jié)合雜巖體的產(chǎn)狀,本文認(rèn)為其巖漿通道可能位于其西北側(cè)的德苴中-基性火山巖帶內(nèi)。本文提出在金寶山礦區(qū)周圍仍然具有較大的找礦潛力,同時(shí)金寶山雜巖體的巖漿通道與德苴裂陷槽有關(guān),因此,在德苴一帶仍有較大的找礦潛力。
[Abstract]:The gold polymetallic deposit is the largest independent platinum group in China, and its genetic type belongs to a typical magma-melting copper-nickel sulfide platinum family element deposit. It is of great theoretical significance and practical significance for the in-depth study of the Jinshajiang-super-rare-earth complex rock mass. The tectonics of the gold-bearing complex is located in the southwest margin of the Yangtze platform, and its west-to-west distance is less than 5km. On the basis of field geological survey, geological survey of mining area, geological profile of rock mass and sample collection of rock ore, combined with the identification of optical sheet under indoor mirror, electron probe analysis, Geochemical analysis and SHRIMP-U-Pb dating methods have been used to deeply study the characteristics of rock mass of the Jinshajiang-ultra-large-scale complex rock mass. According to the study, the rock type mainly consists of basic rock and ultrabasic rock, and the ultrabasic rock is mainly pyroxene peridotite. The platinum group element is mainly in the ultrabasic rock mass, while the basic rock salt contains little ore. Therefore, this paper focuses on the ultra-basic rock mass in the gold-bearing complex rock mass. The composition of peridotite peridotite is mainly olivine and orthopyroxene, and is mainly olivine and orthopyroxene, and is mainly composed of forsterite (the percentage of Fo molecule is between 84 and 86) and antique copper pyroxene (between 83 ~ 89%), followed by forsterite, pyroxene, diopside and chrome iron ore. hornblende, hornblende, etc., due to the strong rock alteration, the rock mass also develops a large number of leaves and the like, and so on. The results show that the content of SiO2 is 32. 5% ~ 40. 52%, MgO content 29. 95% ~ 36. 32%, TFeO content 7. 31% ~ 20. 19%, Al2O3 content 1. 41% ~ 5. 90%, TiO2 content 0. 36% ~ 1. 53%, P2O5 content 0. 03% ~ 0. 22%, Na2O content 0. 01% ~ 0. 51%, MnO content 0. 09% ~ 0. 20% and m/ f ratio of 3.06 ~ 5.98. It belongs to the iron-ultramafic-iron rock, and the main quantity elemental features show that the mixed rock mass belongs to the sub-basic continental tholeiite series. The consolidation index (SI) of rocks is 56. 87% ~ 82. 81%, and the magnesium iron index (MF) is 16. 79% ~ 43. 00%. The consolidation index (SI) of rock is too small, and the magnesium iron index (MF) is larger than that of pyroxene peridotite containing ore. The rare earth element analysis results show that the content of rare earth in rock mass is high, and the content of LREE is 15. 36% 10-6 ~ 37. 77% 10-6, the content of HREE is 2. 32% 10-6 ~ 4.86% 10-6, the ratio of light weight rare earth element w (Ce)/ ww (Y) is 4.35 ~ 7.97, rare earth element distribution diagram shows obvious right inclination. It reflects a strong fractionation effect in the late stage of magmatism. The ratio of the ratio of the ultra-base rare earth elements to the gold was 0. 43 ~ 1. 11, the average ratio was 0. 74. The distribution of rare earth elements showed a significant loss, which reflected the abnormal characteristics of the negative geochemical anomalies of the gold-bearing complex.[w (La)/ w (Sm)] N ratio is 1. 70 ~ 3.32, indicating that its magma source is enriched uranium deposit. The results of trace element analysis show that the strongly incompatible elements such as Rb, U, Th, Ta, Nb, La, Ce, etc. are obviously enriched with respect to weak incompatible elements such as Zr, Hf, Sm, Ti, Y, Yb, Lu, etc., while K, Ba, P, Y, Yb loss are obvious, Sr loss is strong, It is mainly caused by the crystallization of plagioclase. The ratio of Nb/ La is 0. 47 ~ 1. 21, the ratio of Nb/ Ce is 0. 21 ~ 0. 51, the ratio of Lu/ Yb is 0. 10 ~ 0. 18, the ratio of Zr/ Hf is 24. 00 ~ 39. 78, the ratio of Nb/ Ta is 5. 99 ~ 29. 08, and the corresponding ratio of Nb/ La is 5. 99 ~ 29. 08. In the age of 2260Ma in the formation of the gold-bearing complex rock mass, the original magma was subjected to assimilation and dyeing of the earth's crust during the invasion of the original magma and promoted the melting and separation of the sulfide. The platinum group element sulfide minerals are mainly hosted in the ore which is formed by the magmatism, disseminated structure and the like, so that the magmatism is an important factor in the enrichment and mineralization of platinum group elements. The lithology of the ultrabasic rocks of the gold deposit is the peridotite peridotite, and the Fo is close to the rock, and the rock content is generally better. The platinum group elements in the gold ore deposit are mainly in the form of sulfide in the rock mass, while the content of MgO in the ultrabasic rocks shows that it belongs to the high-temperature no-sulfide series, and the sulfide content in the rock mass is low, so that the grade of the platinum group in the gold-gold ore deposit is lower. The Mesozoic-Permian volcanic belt developed in the Late Permian in the area east of the Jinshao complex, west of the rock mass, belongs to the continental tholeiite series and is consistent with the geochemical characteristics of the gold-bearing heterorock. The volcanic belt is formed on the edge of the Yangtze platform formed by the extensional action of the late Permian Woraoshan oceanic crust to the west, and the margin of the Yangtze platform formed by the extension effect. The trace elements of the gold-bearing complex are characterized by the rift activity in the margin of the active continental margin. Therefore, the relationship between the gold and the super-small complex rock mass and the trough of the continental margin is found to have a genetic relationship. In combination with the occurrence of a complex rock mass, this paper holds that the magma passage may be located in the Carboniferous-Permian volcanic belt in the northwest side of the rock mass. This paper puts forward that there is still a large prospecting potential around the gold mining area, while the magma channel of the gold-bearing hybrid rock is related to the Defaultrift trough. Therefore, there is still a large prospecting potential in the area of Dejiang.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P588.12;P618.53
本文編號(hào)：2262570
[Abstract]:The gold polymetallic deposit is the largest independent platinum group in China, and its genetic type belongs to a typical magma-melting copper-nickel sulfide platinum family element deposit. It is of great theoretical significance and practical significance for the in-depth study of the Jinshajiang-super-rare-earth complex rock mass. The tectonics of the gold-bearing complex is located in the southwest margin of the Yangtze platform, and its west-to-west distance is less than 5km. On the basis of field geological survey, geological survey of mining area, geological profile of rock mass and sample collection of rock ore, combined with the identification of optical sheet under indoor mirror, electron probe analysis, Geochemical analysis and SHRIMP-U-Pb dating methods have been used to deeply study the characteristics of rock mass of the Jinshajiang-ultra-large-scale complex rock mass. According to the study, the rock type mainly consists of basic rock and ultrabasic rock, and the ultrabasic rock is mainly pyroxene peridotite. The platinum group element is mainly in the ultrabasic rock mass, while the basic rock salt contains little ore. Therefore, this paper focuses on the ultra-basic rock mass in the gold-bearing complex rock mass. The composition of peridotite peridotite is mainly olivine and orthopyroxene, and is mainly olivine and orthopyroxene, and is mainly composed of forsterite (the percentage of Fo molecule is between 84 and 86) and antique copper pyroxene (between 83 ~ 89%), followed by forsterite, pyroxene, diopside and chrome iron ore. hornblende, hornblende, etc., due to the strong rock alteration, the rock mass also develops a large number of leaves and the like, and so on. The results show that the content of SiO2 is 32. 5% ~ 40. 52%, MgO content 29. 95% ~ 36. 32%, TFeO content 7. 31% ~ 20. 19%, Al2O3 content 1. 41% ~ 5. 90%, TiO2 content 0. 36% ~ 1. 53%, P2O5 content 0. 03% ~ 0. 22%, Na2O content 0. 01% ~ 0. 51%, MnO content 0. 09% ~ 0. 20% and m/ f ratio of 3.06 ~ 5.98. It belongs to the iron-ultramafic-iron rock, and the main quantity elemental features show that the mixed rock mass belongs to the sub-basic continental tholeiite series. The consolidation index (SI) of rocks is 56. 87% ~ 82. 81%, and the magnesium iron index (MF) is 16. 79% ~ 43. 00%. The consolidation index (SI) of rock is too small, and the magnesium iron index (MF) is larger than that of pyroxene peridotite containing ore. The rare earth element analysis results show that the content of rare earth in rock mass is high, and the content of LREE is 15. 36% 10-6 ~ 37. 77% 10-6, the content of HREE is 2. 32% 10-6 ~ 4.86% 10-6, the ratio of light weight rare earth element w (Ce)/ ww (Y) is 4.35 ~ 7.97, rare earth element distribution diagram shows obvious right inclination. It reflects a strong fractionation effect in the late stage of magmatism. The ratio of the ratio of the ultra-base rare earth elements to the gold was 0. 43 ~ 1. 11, the average ratio was 0. 74. The distribution of rare earth elements showed a significant loss, which reflected the abnormal characteristics of the negative geochemical anomalies of the gold-bearing complex.[w (La)/ w (Sm)] N ratio is 1. 70 ~ 3.32, indicating that its magma source is enriched uranium deposit. The results of trace element analysis show that the strongly incompatible elements such as Rb, U, Th, Ta, Nb, La, Ce, etc. are obviously enriched with respect to weak incompatible elements such as Zr, Hf, Sm, Ti, Y, Yb, Lu, etc., while K, Ba, P, Y, Yb loss are obvious, Sr loss is strong, It is mainly caused by the crystallization of plagioclase. The ratio of Nb/ La is 0. 47 ~ 1. 21, the ratio of Nb/ Ce is 0. 21 ~ 0. 51, the ratio of Lu/ Yb is 0. 10 ~ 0. 18, the ratio of Zr/ Hf is 24. 00 ~ 39. 78, the ratio of Nb/ Ta is 5. 99 ~ 29. 08, and the corresponding ratio of Nb/ La is 5. 99 ~ 29. 08. In the age of 2260Ma in the formation of the gold-bearing complex rock mass, the original magma was subjected to assimilation and dyeing of the earth's crust during the invasion of the original magma and promoted the melting and separation of the sulfide. The platinum group element sulfide minerals are mainly hosted in the ore which is formed by the magmatism, disseminated structure and the like, so that the magmatism is an important factor in the enrichment and mineralization of platinum group elements. The lithology of the ultrabasic rocks of the gold deposit is the peridotite peridotite, and the Fo is close to the rock, and the rock content is generally better. The platinum group elements in the gold ore deposit are mainly in the form of sulfide in the rock mass, while the content of MgO in the ultrabasic rocks shows that it belongs to the high-temperature no-sulfide series, and the sulfide content in the rock mass is low, so that the grade of the platinum group in the gold-gold ore deposit is lower. The Mesozoic-Permian volcanic belt developed in the Late Permian in the area east of the Jinshao complex, west of the rock mass, belongs to the continental tholeiite series and is consistent with the geochemical characteristics of the gold-bearing heterorock. The volcanic belt is formed on the edge of the Yangtze platform formed by the extensional action of the late Permian Woraoshan oceanic crust to the west, and the margin of the Yangtze platform formed by the extension effect. The trace elements of the gold-bearing complex are characterized by the rift activity in the margin of the active continental margin. Therefore, the relationship between the gold and the super-small complex rock mass and the trough of the continental margin is found to have a genetic relationship. In combination with the occurrence of a complex rock mass, this paper holds that the magma passage may be located in the Carboniferous-Permian volcanic belt in the northwest side of the rock mass. This paper puts forward that there is still a large prospecting potential around the gold mining area, while the magma channel of the gold-bearing hybrid rock is related to the Defaultrift trough. Therefore, there is still a large prospecting potential in the area of Dejiang.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P588.12;P618.53
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