| 湘东南铁石垅铅锌矿床变形序列、控矿构造及找矿方向 |
| 投稿时间：2025-02-11 修订日期：2025-04-21 点此下载全文 |
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| 基金项目:本文由湖南省地质院科研项目(编号: HNGSTP202307; HNGSTP202317)、湖南省自然科学基金项目(编号: 2024JJ8366)、湖南省自然资源厅重大科研项目(编号: 湘自资科20240102DZ)和中国地质调查局地质调查项目(编号: DD20230055)联合资助。 |
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| 中文摘要:铁石垅铅锌矿床位于湘东南东坡多金属矿田东北部,赋矿断裂主要呈NE向,其次为NW向、近E—W向和近S—N向。控矿构造研究是铁石垅矿床的薄弱环节,制约了成矿规律的深入探讨与进一步找矿方向的提出。本文通过详细的地表和井下露头构造观测与解析,结合区域构造特征和演化背景,厘定了铁石垅矿区构造变形序列及其形成背景,确定了控矿构造类型及其属性,提出了深边部找矿方向。研究认为,矿区中生代以来先后经历了5期主要变形事件：D1—中三叠世晚期受NEE—近EW向挤压,形成NE向右行走滑断裂和剪切破裂、S—N向逆断裂及近S—N向西山背斜；D2—中三叠世末—晚三叠世受NW—SE向挤压,形成NE向逆冲断裂、S—N向左行走滑断裂和剪切破裂；D3—晚三叠世—早侏罗世受NNW—近SN向挤压,形成E—W向逆断裂、NW向右行走滑断裂和剪切破裂及NNE向左行剪切破裂；D4—中侏罗世晚期受NWW—SEE向挤压,形成NEE—EW向右行走滑断裂和剪切破裂及NW向左行剪切破裂；D5—古近纪中晚期受NE—SW向挤压,形成NEE—EW向左行剪切破裂。综合分析认为,矿区主要导矿构造为中三叠世晚期形成的NNW—SN向隐伏逆断裂,主要配、容矿构造为D1—D4期形成的不同规模、产状和运动学性质的断裂、破裂。矿区内进一步的找矿方向是宝安岭背斜和赵家复式背斜核部控制程度较低区段内的不同方向断裂、背斜核部逆断裂及不同方向含矿断裂的复合部位。 |
| 中文关键词:变形序列 控矿构造 找矿方向 铁石垅铅锌矿 湘东南 |
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| Deformation sequences, ore-controlling structures, and prospecting directions of the Tieshilong Pb-Zn deposit in southeast Hunan Province |
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| Abstract:The Tieshilong Pb-Zn deposit is located in the northeast of the Dongpo polymetallic orefield in southeastern Hunan. The ore-bearing faults are mainly in the NE-trending, followed by NW-, EW-, and SN-trending. The study of ore-controlling structures is a weak link in the Tieshilong Pb-Zn deposit, which restricted the understanding for metalloginic regularity and further prospecting direction. Through detailed structural observation and analysis of outcrops and in pits in the Tieshilong deposit, combined with the regional structural characteristics and tectonic evolutions, the authors clarified the deformation sequences and their dynamic background, determined the types and attributes of ore-controlling structures, and pointed out the prospecting directions. This study suggests that the research area experienced five major deformation events since the Mesozoic: D1—Regional NEE-to-EW compression in the late Middle Triassic which caused the formation of NE-trending dextral strike-slip faults and shear fractures, NS-trending thrust faults, and NS-trending Xishan anticline; D2—Regional NW-SE compression during the end of Middle Triassic to Late Triassic which resulted in NE-trending thrust faults and NS-trending sinistral strike-slip faults and shear fractures; D3—Regional NNW-to-NS compression during the Late Triassic to Early Jurassic which led to the development of EW-trending thrust faults, NW-trending dextral strike-slip faults and shear fractures, and NNE-trending sinistral shear fractures; D4—Regional NWW-SEE compression in the late Middle Jurassic which resulted in the NEE-to-EW-trending dextral strike-slip faults and shear fractures and NW-trending sinistral shear fractures; D5—Regional NE-SW compression in the middle-late Paleogene which led to the formation of NEE-to-EW-trending sinistral shear fractures. The ore-passing structures are mainly the NNW-to-SN-trending buried faults formed in the late Middle Triassic. The main ore-bearing structures are the faults and fractures of different scale, occurrence, and kinematic properties formed during stage D1 to D4. The further prospecting directions within the Tieshilong mining area should focus on the faults within the low-controlled sections of the cores of the Bao’anling anticline and Zhaojia anticlinorium, the thrust faults in the cores of anticlines, and the composite areas of ore-bearing faults with varying orientations. |
| keywords:deformation sequences ore-controlling structures prospecting directions Tieshilong Pb-Zn deposit southeastern Hunan |
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