纳米比亚欢乐谷地区白岗岩岩石学、地球化学、年代学特征与铀成矿关系
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- 英文论文题名：Petrology,geochemistry,chronology and uranium mineralisation of alaskite in the Gaudeanmus Area,Namibia
- 论文作者：王生云 ; 范洪海 ; 陈金勇 ; 陈东欢 ; 顾大钊 ; 聂江涛
- 英文论文作者：WANG Sheng-yun ; FAN Hong-hai ; CHEN Dong-huan ; CHEN Jin-yong ; Gu Da-zhao ; Gao Yang ; NIE Jiang-tao ; Beijing Research Institute of Uranium Geology ; Key laboratory of Uranium Resource Exploration and Evaluation Technology ; CNNC
- 年：2015
- 作者机构：核工业北京地质研究院;中核铀资源勘查与评价技术重点实验室;
- 论文关键词：白岗岩 ; 铀成矿 ; 达马拉造山带 ; 纳米比亚欢乐谷地区
- 英文论文关键词：alaskite ; uranium mineralisation ; damara orogen ; gaudeanmus area ; namibia
- 会议召开时间：2015-09-21
- 会议录名称：中国核科学技术进展报告（第四卷）——中国核学会2015年学术年会论文集第1册（铀矿地质分卷、铀矿冶分卷）
- 语种：中文
- 分类号：P619.14
- 学会代码：EGVD
- 会议名称：中国核学会2015年学术年会
- 会议地点：中国四川绵阳
- 主办单位：中国核学会
- 学会名称：中国核学会
- 页数：10
- 文件大小：903k
- 原文格式：O
- 会议级别：全国
摘要
纳米比亚欢乐谷地区位于达马拉造山带北东向陆内分支的南部中央带。本文详细研究了欢乐谷地区白岗岩岩石学、地球化学、年代学与铀成矿的关系。研究结果表明,欢乐谷地区白岗岩的矿物组成和化学成分显示了较大的变化范围,白岗岩根据野外地质特征可划分A、B、C、D、E、F为六种类型,其中D类白岗岩是主要的含矿岩石。白岗岩具有高硅、高碱和低锰、镁、钠、磷、钙的特点,为高钾钙碱性系列-钾玄岩系列的准铝质-过铝质岩石;微量元素总体显示其壳源的特征,但不同类型白岗岩具有不同的球粒陨石标准化稀土元素配分曲线形式,微量元素含量变化范围较大,原始地幔标准化微量元素曲线显示相对分散。元素地球化学特征显示白岗岩物源区成分存在某种程度的不均一性以及不同类型白岗岩其物源区不同。同位素年代学研究表明,欢乐谷地区白岗岩成岩作用与第一期铀成矿作用同时进行。
The Gaudeanmus area lies within the southern Central Zone of the northeast trending branch of the Damara Orogen.This paper studied petrographical,geochemical,and chronological characteristic of alaskite as well as its uranium mineralization in the Gaudeanmus area,Namiba.The alaskite samples display variable mineral and chemical composition.The alaskites have been divided into six distinct types based wholly on observable? eld gelogy characteristics.The D-type alaskite is the mainly uranium-bearing alaskite.Geochemical analyses show that the alaskites contain high silica and alkali,with relatively low manganese,magnesium,sodium,phosphonium and calcium.The alaskites show the characteristic of peraluminous to metaluminous belonging to high-K calc-alkaline to shoshonite series.According to the characteristics of trace elements,the source of alaskite shows the crust origin.The Chondrite-normalized REE distribution patterns of the different types of alaskites are not coincident.The alaskite samples display variable trace element content,Primative mantal-normalized trace element patterns are relative dispersed.All the above-mentioned indicate in some extent the component of provenance area is inhomogeneity and different provenance area produced different types of alaskites.The research on geochronological shows that diagenesis of alaskite and uranium mineralization occurred at the same time in the Gaudeanmus area.
The Gaudeanmus area lies within the southern Central Zone of the northeast trending branch of the Damara Orogen.This paper studied petrographical,geochemical,and chronological characteristic of alaskite as well as its uranium mineralization in the Gaudeanmus area,Namiba.The alaskite samples display variable mineral and chemical composition.The alaskites have been divided into six distinct types based wholly on observable? eld gelogy characteristics.The D-type alaskite is the mainly uranium-bearing alaskite.Geochemical analyses show that the alaskites contain high silica and alkali,with relatively low manganese,magnesium,sodium,phosphonium and calcium.The alaskites show the characteristic of peraluminous to metaluminous belonging to high-K calc-alkaline to shoshonite series.According to the characteristics of trace elements,the source of alaskite shows the crust origin.The Chondrite-normalized REE distribution patterns of the different types of alaskites are not coincident.The alaskite samples display variable trace element content,Primative mantal-normalized trace element patterns are relative dispersed.All the above-mentioned indicate in some extent the component of provenance area is inhomogeneity and different provenance area produced different types of alaskites.The research on geochronological shows that diagenesis of alaskite and uranium mineralization occurred at the same time in the Gaudeanmus area.
引文
[1]Berning,J.The Rossing uranium deposit,South West Africa/Namibia.In:Anhaeusser,C.R.,Maske,E.(Eds.),Mineral Deposits of Southern Africa,vol.Ⅱ[M].Geological Society of South Africa,Johannesburg,1986.1819-1832.
[2]Smith,D.A.M.The geology of the area around the Khan and Swakop rivers in South West Africa[J].Mem geol Surv S Afr,SW Afr Ser,1965.Vol.3.
[3]Herd,D.A.Geochemistry and mineralisation of alaskites in selected areas of the Rossing Uranium Mine,Namibia[D].MSc thesis,University of St,Andrews,1996.
[4]Oliver,G.J.H.Mid-crustal detachment and domes in the Central Zone of the Damara Orogen,Namibia[J].Journal of African Earth Sciences,1994.19,331-344.
[5]Miller,R.McG.The Pan-African Damara Orogen of South West Africa/Namibia.In:Miller,R.McG.(Ed.),Evolution of the Damara Orogen of South West Africa[M].Special Publication of the Geological Society of South Africa,1983.11:431-515.
[6]Henry,G,et al.Multiple detachment model for the early rifting stage of the Late Proterozoic Damara orogen in Namibia[J].Geology,1990.18:67-91.
[7]Kukla,C,et al.U-Pb monazite data relating to metamorphism and granite intrusion in the northwestern Khomas Trough,Damara Orogen,central Namibia[J].Communications of the Geological Survey of Namibia,1991.7:49-54.
[8]Kinnaird,J.A,et al.A review of geological controls on uranium mineralization in sheeted leucogranites within the Damaran Orogen,Namibia[J].Applied Earth Science,2007.116(2):68-85.
[9]Herd,D.A.Geochemistry and Mineralisation of Alaskite in Selected Areas of the Rossing Uranium Mine,Namibia[D].MSc thesis,1996.University of St.Andrews.
[10]McDermott,F,et al.Geochemical constraints on crustal anatexis:a case study from the Pan-African Damara granitoids of Namibia[J].Contributions to Mineralogy and Petrology,1996.123:406-423.
[11]Nex,P.A.M.Tectono-metamorphic setting and evolution of granitic sheets in the Goanikontes area,Namibia[D].Ph.D.Thesis,1997.Communications of the author.
[12]Nex,P.A.M,et al..Petrology,geochemistry and mineralisation of post-collisional magmatism around Goanikontes,southern Central Zone,Damara Orogen,Namibia[J].Journal of African Earth Sciences,2001.33:481-502.
[13]Nex,P.A.M,et al.The occurrence,mineralogy and chemistry of betafite and pyrochlore from sheeted leucogranites of the Rossing area,Namibia:implications for the composition of Ceramics for radioactive waste disposal[R].Economic Geology Research Institute,School of Geosciences University of the Witwatersrand,2003.374:1-24.
[14]Basson,I.J,et al.The Rossing Uranium Deposit:A product of late-kinematic location of uraniferous granites in the Central Zone of the Damara Orogen,Namibia[J].Journal of African Earth Sciences,2004.38:413-435.
[15]李昌年.火成岩微量元素岩石学[M].武汉:中国地质大学出版社,1992.57-121.
[16]Nash,C.R.Metamorphic petrology of the SJ area,Swakopmund District,South West Africa[J].Bulletin of the Precambrian Research,1971.9:77.
[17]London,D.The application of experimental petrology to thegenesis and crystallisation of granitic pegmatites[J].Canadian Min-eralogist,1992.30,499-540.
[18]Le Maitre,R.W.A Classification of Igneous Rocks and Glossary of Terms:Recommendations of the International Union of Geological Sciences,Subcommission on the Systematics of Igneous Rocks[M].Oxford:Blackwell,1989,pp 193.
[19]Jacob,R.E,et al.The regional structural and geological setting of the uraniferous granitic provinces of Southern Africa[J].In:Anhaeusser,C.R.,Maske,S.(Eds.),Mineral Deposits of Southern Africa,1986.2:1807-1818.
[20]Hawkesworth C.J,et al.Isotopic Evolution of the Damara Orogenic Belt.In:Miller,R.McG.(ed.),Evolution of the Damara Orogen of South West Africa/Namibia[M].Geological Society of South Africa,Special Publications,1983,11:397-408.
[21]Mestres-Ridge,D.An investigation into the controls on the distribution of betafite in the SH area,Rossing Uranium Mine[D],Namibia.M.Sc Dissertation,University of St.Andrews.1992.
[22]Taylor S.R,et al.The Continetal Crust:Its Composition and Evolution[M].Oxford:Blackwell Scientific Publication,1985.1-32.
[23]Whalen J B,et al.A-type granites:Geochemical characteristics,discrimination and petrogenesis[J].Contributions to Mineralogy and Petrology,1987.95:407-419.
[24]Berning,J,et al.The Rossing Uranium Deposit,South West Africa[J].Economic Geology.1976.71:351-368.
[25]陈金勇,范洪海,陈东欢,等.纳米比亚欢乐谷地区白岗岩型铀矿床中铀矿物特征研究[J].地质论评,59(5):962-970.
[26]Roesener,H,et al.Uranium In:The Mineral Resources of Namibia.Ministry of Mines and Energy[J].Geological Survey Namibia,1992.pp.7.1-1-7.1-62.
[2]Smith,D.A.M.The geology of the area around the Khan and Swakop rivers in South West Africa[J].Mem geol Surv S Afr,SW Afr Ser,1965.Vol.3.
[3]Herd,D.A.Geochemistry and mineralisation of alaskites in selected areas of the Rossing Uranium Mine,Namibia[D].MSc thesis,University of St,Andrews,1996.
[4]Oliver,G.J.H.Mid-crustal detachment and domes in the Central Zone of the Damara Orogen,Namibia[J].Journal of African Earth Sciences,1994.19,331-344.
[5]Miller,R.McG.The Pan-African Damara Orogen of South West Africa/Namibia.In:Miller,R.McG.(Ed.),Evolution of the Damara Orogen of South West Africa[M].Special Publication of the Geological Society of South Africa,1983.11:431-515.
[6]Henry,G,et al.Multiple detachment model for the early rifting stage of the Late Proterozoic Damara orogen in Namibia[J].Geology,1990.18:67-91.
[7]Kukla,C,et al.U-Pb monazite data relating to metamorphism and granite intrusion in the northwestern Khomas Trough,Damara Orogen,central Namibia[J].Communications of the Geological Survey of Namibia,1991.7:49-54.
[8]Kinnaird,J.A,et al.A review of geological controls on uranium mineralization in sheeted leucogranites within the Damaran Orogen,Namibia[J].Applied Earth Science,2007.116(2):68-85.
[9]Herd,D.A.Geochemistry and Mineralisation of Alaskite in Selected Areas of the Rossing Uranium Mine,Namibia[D].MSc thesis,1996.University of St.Andrews.
[10]McDermott,F,et al.Geochemical constraints on crustal anatexis:a case study from the Pan-African Damara granitoids of Namibia[J].Contributions to Mineralogy and Petrology,1996.123:406-423.
[11]Nex,P.A.M.Tectono-metamorphic setting and evolution of granitic sheets in the Goanikontes area,Namibia[D].Ph.D.Thesis,1997.Communications of the author.
[12]Nex,P.A.M,et al..Petrology,geochemistry and mineralisation of post-collisional magmatism around Goanikontes,southern Central Zone,Damara Orogen,Namibia[J].Journal of African Earth Sciences,2001.33:481-502.
[13]Nex,P.A.M,et al.The occurrence,mineralogy and chemistry of betafite and pyrochlore from sheeted leucogranites of the Rossing area,Namibia:implications for the composition of Ceramics for radioactive waste disposal[R].Economic Geology Research Institute,School of Geosciences University of the Witwatersrand,2003.374:1-24.
[14]Basson,I.J,et al.The Rossing Uranium Deposit:A product of late-kinematic location of uraniferous granites in the Central Zone of the Damara Orogen,Namibia[J].Journal of African Earth Sciences,2004.38:413-435.
[15]李昌年.火成岩微量元素岩石学[M].武汉:中国地质大学出版社,1992.57-121.
[16]Nash,C.R.Metamorphic petrology of the SJ area,Swakopmund District,South West Africa[J].Bulletin of the Precambrian Research,1971.9:77.
[17]London,D.The application of experimental petrology to thegenesis and crystallisation of granitic pegmatites[J].Canadian Min-eralogist,1992.30,499-540.
[18]Le Maitre,R.W.A Classification of Igneous Rocks and Glossary of Terms:Recommendations of the International Union of Geological Sciences,Subcommission on the Systematics of Igneous Rocks[M].Oxford:Blackwell,1989,pp 193.
[19]Jacob,R.E,et al.The regional structural and geological setting of the uraniferous granitic provinces of Southern Africa[J].In:Anhaeusser,C.R.,Maske,S.(Eds.),Mineral Deposits of Southern Africa,1986.2:1807-1818.
[20]Hawkesworth C.J,et al.Isotopic Evolution of the Damara Orogenic Belt.In:Miller,R.McG.(ed.),Evolution of the Damara Orogen of South West Africa/Namibia[M].Geological Society of South Africa,Special Publications,1983,11:397-408.
[21]Mestres-Ridge,D.An investigation into the controls on the distribution of betafite in the SH area,Rossing Uranium Mine[D],Namibia.M.Sc Dissertation,University of St.Andrews.1992.
[22]Taylor S.R,et al.The Continetal Crust:Its Composition and Evolution[M].Oxford:Blackwell Scientific Publication,1985.1-32.
[23]Whalen J B,et al.A-type granites:Geochemical characteristics,discrimination and petrogenesis[J].Contributions to Mineralogy and Petrology,1987.95:407-419.
[24]Berning,J,et al.The Rossing Uranium Deposit,South West Africa[J].Economic Geology.1976.71:351-368.
[25]陈金勇,范洪海,陈东欢,等.纳米比亚欢乐谷地区白岗岩型铀矿床中铀矿物特征研究[J].地质论评,59(5):962-970.
[26]Roesener,H,et al.Uranium In:The Mineral Resources of Namibia.Ministry of Mines and Energy[J].Geological Survey Namibia,1992.pp.7.1-1-7.1-62.
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