东华理工大学学报(自然科学版)
東華理工大學學報(自然科學版)
동화리공대학학보(자연과학판)
JOURNAL OF EAST CHINA INSTITUTE OF TECHNOLOGY(NATURAL SCIENCE)
2013年
1期
1-9
,共9页
崔源远%赖绍聪%耿雯%赵少伟%朱韧之
崔源遠%賴紹聰%耿雯%趙少偉%硃韌之
최원원%뢰소총%경문%조소위%주인지
地球化学%岩石成因%新生代碱性火山岩%青藏高原
地毬化學%巖石成因%新生代堿性火山巖%青藏高原
지구화학%암석성인%신생대감성화산암%청장고원
马泉新生代碱性玄武岩出露在青藏高原东北缘,岩石SiO2介于40.40% ~ 41.84%之间,TiO2含量高(3.73%~4.57%),K2O(0.37% ~3.24%)和Na2O(0.57%~2.59%)含量高且变化范围较宽,K2O/Na2O为0.46~1.92,属于典型的幔源高钛-极高钛大陆溢流碱性玄武岩类 岩石微量及稀土元素具板内火山岩特征,Th、Rb等元素呈较明显的富集状态.岩石87Sr/86Sr(0.704090~0.704668),143Nd/144Nd (0.512770~0.512869),206Pb/204Pb(18.363698~18.866220),207Pb/204Pb(15.495292~ 15.602144),208Pb/204Pb (38.092958~39.399417)等同位素变化特征以及岩石高Mg(Mg# =60.7 ~65.9),高Sm/Yb值,(Ce/Yb)N在29.37 ~35.82,表明马泉碱性玄武岩的岩浆源区深度较大,应来源于软流圈地幔石榴石二辉橄榄岩的局部熔融.
馬泉新生代堿性玄武巖齣露在青藏高原東北緣,巖石SiO2介于40.40% ~ 41.84%之間,TiO2含量高(3.73%~4.57%),K2O(0.37% ~3.24%)和Na2O(0.57%~2.59%)含量高且變化範圍較寬,K2O/Na2O為0.46~1.92,屬于典型的幔源高鈦-極高鈦大陸溢流堿性玄武巖類 巖石微量及稀土元素具闆內火山巖特徵,Th、Rb等元素呈較明顯的富集狀態.巖石87Sr/86Sr(0.704090~0.704668),143Nd/144Nd (0.512770~0.512869),206Pb/204Pb(18.363698~18.866220),207Pb/204Pb(15.495292~ 15.602144),208Pb/204Pb (38.092958~39.399417)等同位素變化特徵以及巖石高Mg(Mg# =60.7 ~65.9),高Sm/Yb值,(Ce/Yb)N在29.37 ~35.82,錶明馬泉堿性玄武巖的巖漿源區深度較大,應來源于軟流圈地幔石榴石二輝橄欖巖的跼部鎔融.
마천신생대감성현무암출로재청장고원동북연,암석SiO2개우40.40% ~ 41.84%지간,TiO2함량고(3.73%~4.57%),K2O(0.37% ~3.24%)화Na2O(0.57%~2.59%)함량고차변화범위교관,K2O/Na2O위0.46~1.92,속우전형적만원고태-겁고태대륙일류감성현무암류 암석미량급희토원소구판내화산암특정,Th、Rb등원소정교명현적부집상태.암석87Sr/86Sr(0.704090~0.704668),143Nd/144Nd (0.512770~0.512869),206Pb/204Pb(18.363698~18.866220),207Pb/204Pb(15.495292~ 15.602144),208Pb/204Pb (38.092958~39.399417)등동위소변화특정이급암석고Mg(Mg# =60.7 ~65.9),고Sm/Yb치,(Ce/Yb)N재29.37 ~35.82,표명마천감성현무암적암장원구심도교대,응래원우연류권지만석류석이휘감람암적국부용융.