Bangangté地區(qū)玄武質(zhì)熔巖,位于喀麥隆火山巖帶中部的西喀麥隆高地（Bambouto,Bamenda and Oku山）的Bameleke高原內(nèi)。研究區(qū)地理范圍為東經(jīng)10°19’00"-10°49’00",北緯 4°00’00"-5°35’00",平均海拔1400m。其北部為Bambouto山,Bamenda山和Oku 山,西南部為Manengouba 山,西部為Bana和Mbo平原。本文運用代表性樣品的新的主量元素、微量元素和稀土元素地球化學以及地質(zhì)年代學數(shù)據(jù)區(qū)分了 Bangangté地區(qū)的兩個巖漿系列:堿性系列和過渡性系列。堿性系列在露頭上主要包括火山巖和碧玄巖、玄武巖、夏威夷巖及橄欖粗安巖,而亞堿性系列（或過渡性系列）在露頭上分布有限,只由玄武巖組成。這些堿性和過渡性系列的熔巖侵位于新生代（36.67-8.89 Ma）,分為明顯的兩期火山活動:第一期發(fā)生于約37 Ma,為玄武巖侵位,代表了過渡性系列;第二期發(fā)生于約15-9 Ma,為碧玄巖、玄武巖、夏威夷巖及橄欖粗安巖侵位,代表了堿性系列。主量元素和微量元素組成表明,這些熔巖從基性巖石演化為分異程度較高的巖石,期間發(fā)生了橄欖石... 

【文章來源】：中國地質(zhì)大學(北京)北京市 211工程院校 教育部直屬院校

【文章頁數(shù)】：122 頁

【學位級別】：博士

【文章目錄】：
摘要
Abstract
Chapter 1 Introduction
    1.1 Research status and scientific problems
        1.1.1 Tertiary to recent magmatism in Cameroon
        1.1.2 Research development about the basaltic lavas
        1.1.3 Scientific problems
    1.2 Geological interest of the volcanic rocks from the Bangangté area
    1.3 Location and geographical settings
    1.4 Aims of the study
    1.5 Outline of the dissertation
Chapter 2 Regional geology
    2.1 Introduction
    2.2 Crystalline basement of Cameroon
    2.3 Crystalline basement of the West Cameroon Highlands
    2.4 Volcanic formations
    2.5 Cameroon Volcanic Line (CVL)
        2.5.1 Overview
        2.5.2 Geology,petrology,geochronology and structural geology of the CVL
        2.5.3 Oceanic segment
        2.5.4 Continental segment
Chapter 3 Working conditions and methods
    3.1 Field works
    3.2 Laboratory works
        3.2.1 X-ray fluorescence (XRF)
        3.2.2 Inductively coupled plasma mass spectrometry (ICP-MS)
        3.2.3 Sr-Nd-Pb isotopes analysis
        3.2.4 K-Ar analytical method
Chapter 4 Petrolology, geochemistry and geochronology of lava from Bangangté area
    4.1 Introduction
    4.2 Petrography
        4.2.1 Petrographic descriptions of volcanic rocks in the Bangangté area
        4.2.2 Nomenclature of volcanic rocks in the Bangangté area
        4.2.3 Outcrops and macroscopic observations of volcanic rocks in theBangangté area
        4.2.4 Microscopic observations of volcanic rocks in the Bangangté area
    4.3 Geochronology
    4.4 Whole-rock geochemistry of mafic lavas from the Bangangté area
        4.4.1 Chemical alteration
        4.4.2 Major elements
        4.4.3 Trace elements
        4.4.4 Sr-Nd-Pb isotopes
    4.5 Conclusion
Chapter 5 Petrogenesis of alkaline and transitional lava of the Bangangté area
    5.1 Introduction
    5.2 Major elements
    5.3 Trace elements
    5.4 Discriminant diagrams
    5.5 Origin of the transitional lavas
        5.5.1 Origin of quartz-normative basalts
        5.5.2 Origin of plagioclase-basalts
    5.6 Geochemical process
        5.6.1 Fractional crystallization
        5.6.2 Interaction with continental crust
    5.7 Source characteristics
    5.8 Partial melting
    5.9 Geotectonic context of volcanism of the Bangangté area
    5.10 Geodynamic implications
Chapter 6 General conclusions
    6.1 conclusions
    6.2 Research innovative findings
References
APPENDICE1
ACKNOWLEDGEMENT
PUBLICATIONS
CURRICULUM VITAE


【參考文獻】：
期刊論文
[1]A comparative review of petrogenetic processes beneath the Cameroon Volcanic Line: Geochemical constraints[J]. Asobo N.E.Asaah,Tetsuya Yokoyama,Festus T.Aka,Tomohiro Usui,Mengnjo J.Wirmvem,Boris Chako Tchamabe,Takeshi Ohba,Gregory Tanyileke,J.V.Hell.  Geoscience Frontiers. 2015(04)



本文編號：3499380