阿拉伯-努比亚地盾厄立特里亚中部新元古代火山-沉积组合和相关花岗岩类成因、构造意义及成矿潜力
发布时间：2021-02-07 02:35
厄立特里亚中部的变质火山-沉积组合和相关的花岗质侵入体位于阿拉伯-努比亚地盾南部,主要由新元古代新生岛弧的增生形成。本研究的主要目的是探讨该地区火山岩和花岗岩的成因及构造背景。研究区地表岩石类型以含变质沉积单元的镁铁质-长英质变质火山岩为主。这些变质火山岩主微量元素组成变化较大,其中SiO2（41.63-78.4 wt.%）、Al2O3（8.51-23.41 wt.%）、MgO（0.05-13.98 wt.%）、Fe2O3（3.11-15 wt.%）、K2O（0.01-2.59 wt.%）、Cr（2.83-834 ppm）、Ni（1.63-244 ppm）、Zr（16.4-128 ppm）,岩石主微量元素含量具有线性特征,表明它们存在成因联系,而含量的变化范围较大可能是地壳同化和分离结晶导致。样品稀土元素总量低（20-144 ppm）,配分模式平坦,具有轻微Eu负异常（Eu/Eu*=0.67-1.36）。微量元素蛛网图显示富集大离子亲石元素（LILE,Ba...
【文章来源】：中国地质大学湖北省 211工程院校 教育部直属院校
【文章页数】：103 页
【学位级别】：博士
【文章目录】：
Resume of the Author
摘要
abstract
Chapter1 Introduction
1.1 General Introduction
1.2 Description of the study area
1.3 Research objectives and significance
1.3.1 Objectives of the research
1.3.2 Significance of the research
Chapter2 Regional Geology
2.1 Regional Geological setting
2.1.1 Tectonic crustal evolution of ANS
2.1.2 The Neoproterozoic geology of Eritrea
2.2 Geological Setting of Central Eritrea
2.2.1 Mafic/intermediate metavolcanic（MIV）unit
2.2.2 Felsic metavolcanic（FMV）unit
2.2.3 Metasedimentary unit
2.2.4 Granitoid intrusive unit
2.3 Structural geology and metamorphism
2.3.1 Structures
2.3.2 Metamorphism
Chapter3 Methodology
3.1 Geological field investigation and sample collection and preparation
3.2 In-situ LA-ICP-MS U-Pb zircon dating
3.3 Whole-rock analyses by XRF and ICP-MS
3.4 TIMS Sr-Rb-Pb isotopic analysis
Chapter4.Results
4.1 Zircon U-Pb age of the Emba-Derho granodiorite
4.2 Whole-rock major and trace elements
4.2.1 Metavolcanic rocks
4.2.2 The granitoid intrusion
4.3 Whole-rock Sr-Nd-Pb isotopic compositions
4.3.1 Isotopic compositions of metavolcanic rocks
4.3.2 Isotopic composition of the granitoid rocks
4.4 Evaluation of element mobility
Chapter5.Petrological classification,Geochronology and petrogenesis of the granitoid greenstone rocks
5.1 Petrological classification of the metavolcanic rocks
5.2 Petrological classification of the Emba-Derho granitoid
5.3 Geochronology
5.3.1 Emplacement age of the Emba-Derho granodiorite
5.3.2 Metamorphism age of the metavolcanic rocks
5.4 Petrogenesis of the metavolcanic rocks
5.4.1 Magma mixing vs.Differentiation
5.4.2 Nature of the mantle source
5.5 Petrogenesis of the Emba-Derho pluton
Chapter6.Tectonic Setting
6.1 Tectonic Affinities of the metavolcanic rocks
6.2 Tectonic affinities of the granitoid rocks
Chapter7.Mineral potential of the greenstone belt of Eritrea
7.1 Geological and structural control of mineralization in the greenstone belt of Eritrea
7.2 The main mineralization type of Eritrea associated with the greenstone and associated granitoid rocks
7.2.1 Gold and Silver deposit
7.2.2 Base metal deposits
7.2.3 Industrial minerals
7.2.4 Construction materials
7.3 Implication for Exploration
Chapter8.Conclusions and Recommendations
8.1 Conclusions
8.2.Recommendations
Acknowledgement
References
本文编号：3021500
【文章来源】：中国地质大学湖北省 211工程院校 教育部直属院校
【文章页数】：103 页
【学位级别】：博士
【文章目录】：
Resume of the Author
摘要
abstract
Chapter1 Introduction
1.1 General Introduction
1.2 Description of the study area
1.3 Research objectives and significance
1.3.1 Objectives of the research
1.3.2 Significance of the research
Chapter2 Regional Geology
2.1 Regional Geological setting
2.1.1 Tectonic crustal evolution of ANS
2.1.2 The Neoproterozoic geology of Eritrea
2.2 Geological Setting of Central Eritrea
2.2.1 Mafic/intermediate metavolcanic（MIV）unit
2.2.2 Felsic metavolcanic（FMV）unit
2.2.3 Metasedimentary unit
2.2.4 Granitoid intrusive unit
2.3 Structural geology and metamorphism
2.3.1 Structures
2.3.2 Metamorphism
Chapter3 Methodology
3.1 Geological field investigation and sample collection and preparation
3.2 In-situ LA-ICP-MS U-Pb zircon dating
3.3 Whole-rock analyses by XRF and ICP-MS
3.4 TIMS Sr-Rb-Pb isotopic analysis
Chapter4.Results
4.1 Zircon U-Pb age of the Emba-Derho granodiorite
4.2 Whole-rock major and trace elements
4.2.1 Metavolcanic rocks
4.2.2 The granitoid intrusion
4.3 Whole-rock Sr-Nd-Pb isotopic compositions
4.3.1 Isotopic compositions of metavolcanic rocks
4.3.2 Isotopic composition of the granitoid rocks
4.4 Evaluation of element mobility
Chapter5.Petrological classification,Geochronology and petrogenesis of the granitoid greenstone rocks
5.1 Petrological classification of the metavolcanic rocks
5.2 Petrological classification of the Emba-Derho granitoid
5.3 Geochronology
5.3.1 Emplacement age of the Emba-Derho granodiorite
5.3.2 Metamorphism age of the metavolcanic rocks
5.4 Petrogenesis of the metavolcanic rocks
5.4.1 Magma mixing vs.Differentiation
5.4.2 Nature of the mantle source
5.5 Petrogenesis of the Emba-Derho pluton
Chapter6.Tectonic Setting
6.1 Tectonic Affinities of the metavolcanic rocks
6.2 Tectonic affinities of the granitoid rocks
Chapter7.Mineral potential of the greenstone belt of Eritrea
7.1 Geological and structural control of mineralization in the greenstone belt of Eritrea
7.2 The main mineralization type of Eritrea associated with the greenstone and associated granitoid rocks
7.2.1 Gold and Silver deposit
7.2.2 Base metal deposits
7.2.3 Industrial minerals
7.2.4 Construction materials
7.3 Implication for Exploration
Chapter8.Conclusions and Recommendations
8.1 Conclusions
8.2.Recommendations
Acknowledgement
References
本文编号：3021500
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