(1. 江西省地質(zhì)局物化探大隊(duì)，南昌 330002；
2. 中南大學(xué) 地球科學(xué)與信息物理學(xué)院，長(zhǎng)沙 410083；
3. 湖南繼善高科技有限公司，長(zhǎng)沙 410208)
摘 要: 朱溪鎢銅礦是近年發(fā)現(xiàn)的超大型矽卡巖型鎢銅礦床，刷新了鎢礦資源量的世界紀(jì)錄，主礦體埋深普遍超過(guò)1000 m。2017年，礦體在傾向和走向上沒(méi)有完全封閉，主要控巖控礦構(gòu)造的深部產(chǎn)狀未知，亟需開(kāi)展深部探測(cè)工作。本研究嘗試將廣域電磁法應(yīng)用到朱溪礦區(qū)深部探測(cè)；利用物性資料和井旁視電阻率測(cè)深曲線建立了目標(biāo)地質(zhì)體電性、密度、磁性與巖性之間的聯(lián)系；開(kāi)展了重磁電多參數(shù)對(duì)比分析，結(jié)合已知地質(zhì)資料繪制了骨干剖面的二維地質(zhì)-地球物理斷面，依據(jù)廣域電磁法反演斷面擬三維切片圖構(gòu)建了三維地質(zhì)找礦模型。結(jié)果表明：這些工作較好地揭示了區(qū)內(nèi)主控巖控礦構(gòu)造、賦礦層位的展布形態(tài)，獲取了與深部隱伏巖體有關(guān)的熱液蝕變活動(dòng)信息。廣域電磁法為朱溪礦區(qū)深部500~3000 m“第二找礦空間”的成礦規(guī)律研究、下一步找礦方向等提供了有力依據(jù)，是金屬礦產(chǎn)深部找礦的有效方法技術(shù)。
關(guān)鍵字: 朱溪鎢銅礦；廣域電磁法；矽卡巖；深部探測(cè)
（1. Geophysical & Geochemical Exploration Brigade of Jiangxi, Nanchang 330002, China;
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
3. Hunan Geosun High-Tech Co., Ltd., Changsha 410208, China）
Abstract:The Zhuxi W-Cu polymetallic deposit in Jiangxi Province, China, is a super large-scale skarn deposit, sets the new world record of tungsten mineral resources in recent years. The burial depth of the main orebodies commonly exceeds 1000 m. Because of the lack of deep exploration, until 2017, the orebodies along the dip and strike direction were not closed completely, and the main rock-control and ore-control structures were not known. The deep exploration was urgently needed. The wide field electromagnetic method was applied for deep exploration. The logical relationships between the resistivity, density, magnetic and lithology of the target geologic body have been established, based on the characteristics of the property data and the sounding resistivity near by the drill. The authors then made a comprehensive study by multiparameter mutual constraint with fine processing and interpretation of gravity, magnetic and electric, compared with known geologic data, drew the 2D geological-geophysical section of the backbone profile. And the 3D geological ore-prospecting model has been set up by wide field electromagnetic inversion sections. The results show that those works clearly reveal the distributed shape of the main rock-control and ore-control structures and the main ore-bearing stratum. The magma hydrothermal alteration which relates to concealed Yanshanian intrusive rocks in deep is acquired. The experimental results are references for the 500-3000 m deep-seated second mineralization location’s metallogenic regularity and the further geological prospecting direction of Zhuxi W-Cu polymetallic deposit, and show that the wide field electromagnetic method is an effective method for deep exploration.
Key words: Zhuxi W-Cu deposit; wide field electromagnetic method; skarn; deep exploration
