湘西沃西金矿综合地电方法研究（Iraj Vosoughi Niri ，2003，中南大学博士论文）

老马居士 · 发表于 2012-8-17 07:07

论文标题：湘西沃西金矿综合地电方法研究
论文作者：Iraj Vosoughi Niri
论文导师：何继善
论文学位：博士
学位授予年份：2003
论文专业：地球探测与信息技术
论文单位：中南大学
论文页数：161
格式：NH，需在中国知网下载CAJViewer阅读器
附件：5

摘要：
研究区域-沃溪金锑钨矿位于湘西沅陵县沃溪镇内。矿区位于东经110°54′北纬28°32′，面积12平方公里，距常德市西南114公里，距沅陵县东79公里。矿区构造可分为弧形、WE向和NE向隆起构造。矿区位于仙鹅抱蛋背斜的东北翼。出露地层主要为元古界的冷家溪群、板溪群震旦系以及上白垩统地层。在早五岭运动也既众所周知的东安运动的作用下，冷家溪群和板溪群以非完全倾斜角相接触。为了研究矿区矿床地质、圈出地质构造以及寻找新的远景矿区，已经开展了包括CSAMT、MT和IP在内的地球物理方法。在沃溪矿区在不同的两个阶段(A和B)分别进行了标量可控源音频大地电磁法(CSAMT)，同时在第三阶段(C阶段)进行了国内首次张量可控源音频大地电磁法。可控源音频大地电磁法为矿区提供了矿化层和构造的重要信息。后来详细的地质成图以钻探结果证实这些地球物理方法结果的正确性。对CSAMT测量进行RRI反演，可以有效的生成二维电阻率图像。在高密度钻探和地质研究结果验证下，沿三条测线近上的矿IP剖面结果证实了CSAMT法的有效性和可靠性。伪随机多频激电测深与二维CSAMT模拟具有高度一致性。根据已知结果部署的钻孔更加证明了这两种方法结合应用的有效性。为了研究区域的深部构造，以2公里的点距在20公里长的测线上采集到了11个点的MT数据。结果表明在沃溪矿区下面有一个相对深的延伸隐伏断层。基于已开展的综合地电方法结果、野外地质和钻探数据,在矿区追索并圈定了一些新的断层,勘探出了三个大规模的矿床。地球物理工作的结果、野外工作以及钻探数据使我们对于矿床地质有了一些新的认识。在提供的模型中,此区域隐伏的主断层(武赫断层)与其它一些主断层如沃溪断层以及新圈定的断层如FZ、F3、F4和甘子坪断层都可以归纳为外延盆地的正常断层。基于假设的模型,应该在甘子坪断层北部和新田湾断层西北部进行勘探工作。与此同时,东部和西部的探矿也应给予密切的重视。
关键词：矿床地质,湘西,CSAMT,主断层,方法研究,金矿,研究区域,矿区,方法结果,地电

目录：
CHAPTER ONE: GEOLOGY OF THE STUDY AREA
Ⅰ. Geography and Geology of Hunan Province
(A) Geographical Position
(B) Transportation
(C) Landforms
(D) Climate
(E) Geologic Structures
(F) Sedimentary Rocks
(G) Stratigraphy
(H) Magmatic Rocks And Ore Resources
(I) Gold Deposits Distribution In Hunan
Ⅱ. Geology of Woxi Deposit
(A) Introduction
(B) Igneous Rocks
(C) Stratigraphy
1. Lengjiaxi Group Of The Middle Proterozoic
2. Banxi Group Of The Upper Proterozoic
(D) Structural Geology
1. Introduction
2. Woxi Fault
(ⅰ) Characteristics
(ⅱ) Normal Or Reverse
(ⅲ) Relation With Mineralization
3. Other Faults
(ⅰ) Fault In The West
(ⅱ) Interlayer Faults
(ⅲ) Post-mineralization Faults
4. Folds
(E) Mineralogy And Mineralography
(F) Orebody Shape
1. Interlayered Vein
2. Stockwork
3. Joint Veins
(G) Wallrock Alterations
(H) Structure And Mineralization
1. Control Of Fracture Zone On Mineralization
2. Secondary Faults And Fractures Role On Mineralization
CHAPTER TWO: CONTROLLED SOURCE AUDIOFREQUENCY MAGNETOTELLURICS (CSAMT)
Ⅰ. Introduction
Ⅱ. Objectives
Ⅲ. CSAMT Technique Description
(A) CSAMT Parameters Measured And Calculated
(B) CSAMT Signals And Parameters
1. Field Strength
2. Apparent resistivity
Ⅳ. Applications
Ⅴ. Cultural Noise
Ⅵ. Tensor And Scalar Measurements
Ⅶ. Data density Considerations
Ⅷ. Resolution Considerations
Ⅸ. Geologic Considerations
Ⅹ. Topographic Considerations
Ⅺ. Instrumentation
Ⅻ. Laboratory Measurements
ⅩⅢ. Source Field Behavior
ⅩⅣ. Survey Grid and Data Acquisition
(A). Stage A
(B) Stage B
(C) Stage C
ⅩⅤ. CSAMT Working Parameters
ⅩⅥ. Data Quality And Accuracy
(A) Precise Evaluation Of Geophysical Work
ⅩⅦ. Data Processing And Interpretation
(A) Resistivity Model And Geological Implications
(B) Near-field And Static Shift Correction
(C) 1-D Interpretation
(D) 2-D Interpretation
1. RRI 2-D Inversion
(E) 3-D Interpretation
(F) Comprehensive Interpretation
1. Stage A
(ⅰ) Sounding Pseudosections' Interpretation(Stage A)
(ⅱ) Characteristics Of Sounding Curves
(ⅲ) Apparent Depth Interpretation
(a) Depth-level Modeling Results
2. Stage B
(ⅰ) Pseudosections Interpretation
(a) Original Cagniard Apparent Resistivity Log Frequency Pseudosections
(ⅱ) Depth Inversion
(a) Plot Analysis
(b) Depth-level Modeling Results
CHAPTER THREE: INDUCED POLARIZATION
Ⅰ. Introduction
Ⅱ. Dual-frequency IP Over Tanghuping Prospect
A. Introduction
B. Electrical Properties Of The Prospect And Geophysical Model
C. Surveying, Interpretation And Geological Explanation
1. Gradient Array
2. Pole-dipole and Reverse Pole-dipole Array
Ⅲ. Near-ore Induced Polarization Profiling
A. Introduction
B. Technique Description
C. Laboratory Studies And Modeling
D. Field Survey And Data Acquisition
E. Qualitative Interpretation
Ⅳ. Multi-frequency IP Sounding
A. Introduction
B. Accomplished Workload
C. Explanation of The Ps, PFE And △φ(?) Sounding Curves
1. Line A5, Station 36
2. Line B5, Station 82
3. Line B6, Station 48
CHAPTER FOUR: MT
Ⅰ. Introduction
Ⅱ. Field Survey
Ⅲ. Data Interpretation
CHAPTER FIVE: DISCUSSION, RESULTS, AND CONCLUSIONS
Ⅰ. Discussion
A. Comprehensive Geophysical Interpretation
B. Comprehensive Geological Interpretation
Ⅱ. Results
Ⅲ. Conclusions
Ⅳ. Suggestions
REFERENCES
ABSTRACT AND TITLE PAGE IN CHINESE