【摘要】：板廟子金礦床位于白山市以北5km～8km，是目前正在勘探、開采的大型金礦床。 礦區(qū)地層有老嶺群和青白口系，F(xiàn)102是重要控礦構(gòu)造，F(xiàn)100是重要容礦構(gòu)造。礦石礦物有自然金、褐鐵礦、毒砂、赤鐵礦、黃鐵礦、膠狀黃鐵礦等；礦石具有鑲邊、填隙等結(jié)構(gòu)；礦石構(gòu)造主要有角礫狀構(gòu)造、浸染狀構(gòu)造、膠狀構(gòu)造、星點(diǎn)狀構(gòu)造等，圍巖為硅化構(gòu)造角礫巖，成礦期主要有：石英—金—黃鐵礦階段、石英—金—浸染狀黃鐵礦階段、重晶石—玉髓—金—赤鐵礦階段、黃鐵礦—白鐵礦階段。 與板廟子金礦成礦有關(guān)的巖體為中侏羅世花崗閃長(zhǎng)斑巖巖體，巖石化學(xué)及巖石地球化學(xué)的研究表明，剛玉含量6.30～8.73，Al2O3含量17.27%～17.85%，A/CNK值為1.49～1.81，屬于強(qiáng)過(guò)鋁質(zhì)花崗巖；全堿（Na2O+K2O）值為5.32%～5.60%，平均5.44%；里特曼指數(shù)σ=1.13～1.29，＜3.3，是鈣堿性巖石；δEu為1.01～1.06，＞1，銪具正異常，表明源區(qū)富斜長(zhǎng)石；δCe為0.72～0.82，平均0.76，＜1，具負(fù)鈰異常，鈰虧損型，低場(chǎng)強(qiáng)元素Rb、Ba相對(duì)富集，Sr虧損；高場(chǎng)強(qiáng)元素P、U、Sm、Th富集，虧損Ti、K，Ti相對(duì)虧損，屬造山帶S型花崗巖，其構(gòu)造環(huán)境位于火山弧環(huán)境中，其形成與板塊俯沖有密切聯(lián)系。 氣液兩相流體包裹體多呈近圓形、橢圓形等，大小2μm～12μm之間，2μm～5μm居多，均一溫度140.0℃～243.3℃，平均190.4℃，，屬低溫；密度0.82g/cm3～0.93g/cm3，平均值0.91g/cm3，屬低密度；主成礦期壓力9.64Mpa～17.91Mpa，平均值12.51Mpa；鹽度1.7%NaCl～3.4%NaCl，平均鹽度2.81%NaCl，屬低鹽度；成礦深度0.96km～1.80km，平均值1.25km，是淺成熱液礦床。通過(guò)對(duì)S同位素分析表明，S來(lái)源于海相蒸發(fā)巖。 綜合研究表明：板廟子金礦為燕山期與造山運(yùn)動(dòng)有關(guān)的淺成低溫?zé)嵋盒偷V床。
[Abstract]:Panmiaozi gold deposit is a large gold deposit which is currently under exploration and mining, which is located at 5 km ~ 8 km north of Baishan City. The strata of Laoling Group and Qingbakou system are important ore-controlling structures and F100 is an important ore-bearing structure. Ore minerals include natural gold, limonite, arsenopyrite, hematite, pyrite, colloidal pyrite, etc. The ore has rimmed and interstitial structures; ore structures are mainly breccia structure, disseminated structure, colloidal structure, star dot structure, etc. The surrounding rocks are silicified structural breccia, which are mainly composed of quartz-gold-pyrite, quartz-gold-disseminated pyrite, barite, chalcedone-gold-hematite, pyrite and albite. The ore-forming body of Banmiaozi gold deposit is the middle Jurassic granodiorite porphyry. The petrochemistry and geochemistry show that the content of corundum is 6.30 ~ 8.73% Al _ 2O _ 3 17.27 and 17.85A / CNK is 1.491.81, which belongs to strong peraluminous granite. The total alkali (Na2O K 2O) value is 5.32 and 5.60, with an average value of 5.44. the Ritman index 蟽 1.131.29, < 3.3, is calc-alkaline rock; 未 Eu is 1.01C 1.06, > 1, europium is positive anomaly, indicating that the source region is plagioclase, 未 Ce is 0.720.82 (mean 0.76, < 1), with negative cerium anomaly, cerium depletion type, 未 Ce = 0.72 0.82 (mean 0.76, < 1). The low field strength element Rb,Ba is relatively enriched with Sr depletion, and the high field strength element is rich in Rb,Ba and depleted in Ti,K,Ti. It belongs to the S-type granites of orogenic belt, and its tectonic environment is located in the volcanic arc environment, and its formation is closely related to plate subduction. The gas-liquid two-phase fluid inclusions are almost round and oval in shape, mostly in size of 2 渭 m ~ 12 渭 m ~ (2 渭 m) ~ 2 渭 m ~ 5 渭 m. The homogeneous temperature is 140.0 鈩

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