(1. 江西省地質(zhì)調(diào)查研究院，南昌 330030；
2. 東華理工大學(xué) 地球物理與測(cè)控技術(shù)學(xué)院，南昌 330013；
3. 中南大學(xué) 地球科學(xué)與信息物理學(xué)院，長(zhǎng)沙 410083；
4. 湖南省地質(zhì)調(diào)查院，長(zhǎng)沙 410116；
5. 湖南省核工業(yè)地質(zhì)調(diào)查院，長(zhǎng)沙 410011)
摘 要: 為揭示湘東北幕阜山-梅仙兩大巖體之間的深部地質(zhì)結(jié)構(gòu)，深化巖漿構(gòu)造的控礦作用認(rèn)識(shí)，實(shí)現(xiàn)地球物理深地探測(cè)技術(shù)在偉晶巖型稀有金屬礦床找礦中的應(yīng)用，對(duì)經(jīng)過(guò)湘東北幕阜山-梅仙礦集區(qū)的電磁測(cè)深剖面進(jìn)行了處理和解釋?zhuān)Y(jié)合地質(zhì)信息推演了深部地質(zhì)構(gòu)造格局。頻率域大地電磁探測(cè)數(shù)據(jù)阻抗張量和相位張量分解分析表明湘東北仁里礦集區(qū)在高頻區(qū)(大于1 Hz)主要呈現(xiàn)二維構(gòu)造特征；利用Swift 分解和相位張量分解結(jié)果對(duì)剖面所有測(cè)點(diǎn)數(shù)據(jù)進(jìn)行電性主軸分析，判斷出剖面主要構(gòu)造走向總體上呈北偏西48°~50°；針對(duì)TE、TM 兩個(gè)模式利用Occam 反演方法分別進(jìn)行了單獨(dú)和聯(lián)合反演，并對(duì)幕阜山-梅仙地區(qū)深部電性分布進(jìn)行了地質(zhì)解釋。本文綜合研究結(jié)果表明，幕阜山-梅仙兩大巖體深部存在走向北西-南東、傾向東北的巖漿構(gòu)造，此構(gòu)造控制的巖脈穿插到冷家溪群中，形成一系列走向北西向、傾向南西的含稀有金屬偉晶巖群。
關(guān)鍵字: 湘東北；幕阜山地區(qū)；電性結(jié)構(gòu)；偉晶巖脈；電磁測(cè)深；巖漿構(gòu)造；稀有金屬
（1. Geology Survey Institute of Jiangxi Province, Nanchang 330030, China;
2. School of Geophysics and Measurement-control Technology,East China University Technology, Nanchang 330013, China;
3. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
4. Geology Survey Institute of Hunan Province, Changsha 410116, China;
5. Nuclear Geology Institute of Hunan Province, Changsha 410011, China）
Abstract:In order to reveal the stratigraphic structure between the Mufushan-Meixian pluton in northeastern Hunan, to deepen the understanding of magmatic structure for ore control, and to realize the guidance of geophysical deep exploration technology for pegmatite rare metal deposits, the electromagnetic sounding profile in the area passing through the Mufushan-Meixian ore concentration area in northeastern Hunan was processed and interpreted, and the stratigraphic structure was deduced based on geological information. First, the impedance tensor and phase tensor decomposition analysis of the frequency domain magnetotelluric detection data reveals that the Renli ore cluster in northeastern Hunan mainly presents two-dimensional structural features in the high-frequency area (greater than 1 Hz). Second, the Swift decomposition and the phase tensor decomposition result carried out the electrical principal axis analysis on the data of all the survey points of the profile, and it was judged that the main structural trend of the profile was 48°－50° west by north as a whole. Finally, the Occam inversion method was used for the TE and TM modes, respectively. Individual and joint inversions were carried out, and the deep electrical distribution in the Mufushan-Meixian area was obtained and geological interpretation was carried out. The research results show that there is a magmatic structure in the deep part of the Mufushan-Meixian pluton, which strikes the northwest-southeast and tends to the northeast. Under the activity of this structure, the rock veins perpendicular to its azimuth intersect into the Lengjiaxi Group and form a series of rare metal-bearing pegmatite groups trending northwest and leaning southwest.
Key words: Mufushan area in northeast of Hunan; electrical structure; pegmatite veins; electromagnetic sounding; magmatic structure; rare metals
