內(nèi)蒙古敖漢旗金廠梁金礦床地球化學(xué)特征及成因研究
發(fā)布時(shí)間：2018-09-15 19:07
【摘要】：內(nèi)蒙-興安地塊和華北板塊北部二者的交匯位置是理想的成礦環(huán)境，區(qū)內(nèi)金礦床比較發(fā)育，金廠梁金礦床正處在該礦集區(qū)內(nèi)。區(qū)內(nèi)斷裂構(gòu)造極其發(fā)育，巖漿活動(dòng)頻繁，成礦條件優(yōu)越。本文旨在通過(guò)對(duì)該礦床的區(qū)域成礦背景、礦床地質(zhì)地球化學(xué)特征、礦床成因及機(jī)制等研究，為該礦床及區(qū)域金礦的找礦勘探奠定理論基礎(chǔ)。 與金廠梁金礦成礦有關(guān)的晚三疊世二長(zhǎng)花崗巖巖石化學(xué)、地球化學(xué)研究表明，該巖體屬于高鋁、高鉀鈣堿性系列巖石。在R1-R2構(gòu)造環(huán)境判別圖解中，二長(zhǎng)花崗巖樣品投影點(diǎn)主要落于造山晚期花崗巖區(qū)。而花崗巖Ta-Yb構(gòu)造環(huán)境判別圖解中，主要位于同碰撞-造山晚期花崗巖區(qū)。因此，晚三疊世二長(zhǎng)花崗巖是陸-陸碰撞造山晚期產(chǎn)生的“S”型花崗巖。 礦床地質(zhì)特征研究表明，（含）金礦體賦礦圍巖為中太古代烏拉山巖群。該地層主要包括黑云斜長(zhǎng)片麻巖、黑云角閃斜長(zhǎng)片麻巖、斜長(zhǎng)角閃片麻巖以及混合巖化片麻巖，為一套太古代變質(zhì)巖系。區(qū)內(nèi)斷裂較為發(fā)育，主要為分為近東西向、北東向。其中，礦區(qū)北部發(fā)育一條近東西向斷裂構(gòu)造，在二長(zhǎng)花崗巖和烏拉山巖群的接觸位置，發(fā)育構(gòu)造破碎帶，破碎帶內(nèi)可見(jiàn)到硅化、綠泥石化等。礦脈受控于斷裂構(gòu)造，礦體的產(chǎn)出主要分為透鏡狀、脈狀、扁豆?fàn)畹刃螒B(tài)。在石英脈或者硅化圍巖內(nèi)，礦化較為發(fā)育。金屬礦物主要有黃銅礦、黃鐵礦、銀金礦、斑銅礦、磁鐵礦、輝銻礦，發(fā)育有硅化、（黃鐵）絹英巖化、碳酸鹽化、綠泥石化等圍巖蝕變類型，為一套與金成礦有關(guān)的中低溫?zé)嵋何g變。 流體包裹體研究表明，石英中包裹體類型主要為氣液兩相，氣液比通常為10%～30%，多集中在10%～15%之間。成礦流體的鹽度范圍為1.05～8.14wt%NaCl，密度處在0.856～0.986g/cm3之間，顯示出低鹽度、低密度的特點(diǎn)。均一溫度為138.3～223.2℃，成礦壓力5.32～11.1Mpa，成礦深度0.52～1.11Km，具有中低溫淺成成礦的特點(diǎn)。 H、O同位素研究表明，含礦熱液具有深源特點(diǎn)，主成礦期的成礦流體以巖漿水為主，并含有少量的大氣水。S同位素研究表明，成礦物質(zhì)來(lái)源于地幔或地殼深部。 綜合研究認(rèn)為，，金廠梁金礦床為形成于印支期的淺成低溫造山型金礦床。
[Abstract]:The intersection position between the Neimeng-Xingan block and the northern part of the North China plate is an ideal metallogenic environment where the gold deposits are relatively developed and the Jinchangliang gold deposit is located in the ore accumulation area. The fault structure in the area is extremely developed, magmatic activity is frequent, and metallogenic conditions are superior. The purpose of this paper is to lay a theoretical foundation for the prospecting and exploration of the deposit and the regional gold deposit through the study of the regional metallogenic background, geological and geochemical characteristics, genesis and mechanism of the deposit. The petrochemistry and geochemistry of the late Triassic granites associated with the mineralization of the Jinchangliang gold deposit indicate that the rock body belongs to a series of rocks of high aluminum and high potassium calc-alkaline series. In the discriminant diagram of R1-R2 tectonic environment, the projection points of the monzomorphic granite samples are mainly located in the late orogenic granite area. In the distinguishing diagram of Ta-Yb tectonic environment of granite, it is mainly located in the area of syncollision-orogenic late granite. Therefore, the late Triassic monzomorphic granites are "S" type granites produced in late continental-continental collision orogenic period. The geological characteristics of the deposit indicate that the host rock of the gold deposit is the middle Archean Wulashan rock group. The strata are mainly composed of black cloud plagioclase gneiss, black cloud hornblende gneiss, plagioclase diorite gneiss and migmatite gneiss, which are a set of Archean metamorphic rocks. The faults in the area are relatively developed, mainly divided into near-E-W and N-E directions. Among them, a near east-west fault structure developed in the north of the mining area. In the contact position of the monzonitic granite and the Wulashan rock group, the tectonic fracture zone is developed, and silicification and greenstone can be seen in the breakage zone. The ore vein is controlled by the fault structure and the orebody is mainly divided into lenticular, vein and lentil forms. In quartz vein or silicified surrounding rock, mineralization is more developed. The main metallic minerals are chalcopyrite, pyrite, silver gold deposit, porphyrite, magnetite, stibnite, and there are silicification, (Huang Tie) sericite, carbonization, green mud petrifaction and other wall rock alteration types. It is a set of medium and low temperature hydrothermal alteration related to gold mineralization. The study of fluid inclusions shows that the inclusions in quartz are mainly gas-liquid two-phase, the gas-liquid ratio is usually 100.30%, and most of the inclusions are between 10% and 15%. The salinity range of ore-forming fluid is 1.05 ~ 8.14 wtNaCl.The density is between 0.856~0.986g/cm3, showing the characteristics of low salinity and low density. The homogenization temperature is 138.3 ~ 223.2 鈩
本文編號(hào)：2244212
[Abstract]:The intersection position between the Neimeng-Xingan block and the northern part of the North China plate is an ideal metallogenic environment where the gold deposits are relatively developed and the Jinchangliang gold deposit is located in the ore accumulation area. The fault structure in the area is extremely developed, magmatic activity is frequent, and metallogenic conditions are superior. The purpose of this paper is to lay a theoretical foundation for the prospecting and exploration of the deposit and the regional gold deposit through the study of the regional metallogenic background, geological and geochemical characteristics, genesis and mechanism of the deposit. The petrochemistry and geochemistry of the late Triassic granites associated with the mineralization of the Jinchangliang gold deposit indicate that the rock body belongs to a series of rocks of high aluminum and high potassium calc-alkaline series. In the discriminant diagram of R1-R2 tectonic environment, the projection points of the monzomorphic granite samples are mainly located in the late orogenic granite area. In the distinguishing diagram of Ta-Yb tectonic environment of granite, it is mainly located in the area of syncollision-orogenic late granite. Therefore, the late Triassic monzomorphic granites are "S" type granites produced in late continental-continental collision orogenic period. The geological characteristics of the deposit indicate that the host rock of the gold deposit is the middle Archean Wulashan rock group. The strata are mainly composed of black cloud plagioclase gneiss, black cloud hornblende gneiss, plagioclase diorite gneiss and migmatite gneiss, which are a set of Archean metamorphic rocks. The faults in the area are relatively developed, mainly divided into near-E-W and N-E directions. Among them, a near east-west fault structure developed in the north of the mining area. In the contact position of the monzonitic granite and the Wulashan rock group, the tectonic fracture zone is developed, and silicification and greenstone can be seen in the breakage zone. The ore vein is controlled by the fault structure and the orebody is mainly divided into lenticular, vein and lentil forms. In quartz vein or silicified surrounding rock, mineralization is more developed. The main metallic minerals are chalcopyrite, pyrite, silver gold deposit, porphyrite, magnetite, stibnite, and there are silicification, (Huang Tie) sericite, carbonization, green mud petrifaction and other wall rock alteration types. It is a set of medium and low temperature hydrothermal alteration related to gold mineralization. The study of fluid inclusions shows that the inclusions in quartz are mainly gas-liquid two-phase, the gas-liquid ratio is usually 100.30%, and most of the inclusions are between 10% and 15%. The salinity range of ore-forming fluid is 1.05 ~ 8.14 wtNaCl.The density is between 0.856~0.986g/cm3, showing the characteristics of low salinity and low density. The homogenization temperature is 138.3 ~ 223.2 鈩
本文編號(hào)：2244212
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