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题名: Mantle sources and petrogenesis of the Cenozoic basalts in Fanshi, Shanxi Province: Geochemical and Sr-Nd-Pb-Hf isotopic evidence
其他题名: 山西繁峙新生代玄武岩地幔源区及成因探讨:元素及Sr-Nd-Pb-Hf同位素地球化学证据
作者: Ye, L; Liu, JJ; Niu, YL; Guo, PY; Sun, P; Cui, HX
收录类别: SCIE ; CSCD
出版日期: 2015-01
刊名: ACTA PETROLOGICA SINICA
卷号: 31, 期号:1, 页码:161-175
期刊主办单位: 中国矿物岩石地球化学学会 ; 中国科学院地质与地球物理研究所
出版者: SCIENCE CHINA PRESS
出版地: BEIJING
中文摘要: 山西省繁峙玄武岩位于华北克拉通重力梯度带附近,是华北克拉通中部新生代玄武岩重要组成部分。前人全岩K-Ar测年结果为26.3 ~24.3Ma。对繁峙地区苏孟庄和应县两地玄武岩的地球化学特征研究表明,其微量元素和同位素均具有类OIB特征,即富集不相容元素,轻、重稀土元素分馏明显((La/Yb)_N =8.42 ~21.60),不存在Sr、Eu负异常,Sr同位素比值(~(87)Sr/~(86)Sr=0. 703848 ~0. 704870)较低,Nd (~(143)Nd/~(144)Nd = 0. 512617 ~0. 513057)和 Hf (~(176)Hf/~(177)Hf = 0. 282873 ~0. 283001)同位素比值较高,Pb 同位素比值分别为~(206)Pb/~(204)Pb = 17.2 ~ 17. 9,~(207)Pb/~(204)Pb = 15. 3 ~ 15. 4和~(208)Pb/~(204)Pb =37. 5 ~37. 9。结合岩相学特征和主量元素特征,我们推断繁峙新生代玄武岩是软流圈低程度部分熔融结果,并存在岩石圈物质的加入,岩浆上升时在岩石圈地幔条件下的岩浆房内经历了以橄榄石、单斜辉石为主的分离结晶作用,岩浆因快速上升而地壳混染程度甚低。苏孟庄碱性玄武岩具有较深的熔融深度和较低的熔融程度,而应县亚碱性玄武岩熔融深度较浅,熔融程度较高。结合重力梯度带附近其他地区的新生代玄武岩的研究,我们推测重力梯度带附近新生代的火山活动可能起源于西部软流圈地幔向东流动越过重力梯度带时的减压部分熔融,该地区广泛分布的断裂带为岩浆上涌提供了通道。本文为中国东部新生代玄武质火山活动的岩石成因学研究提供了新的视角。
英文摘要: The Fanshi basalts located in the vicinity of the Da Hinggan Ling-Taihangshan gravity gradient zone, represent a major component of Cenozoic basalts of the central North China Craton. Previous studies gave the Fanshi basalts whole rock K-Ar ages of 26.3 similar to 24.3Ma. The Fanshi basalts from Sumengzhuang and Yingxian two locations all show OIB-like trace element and isotopic signatures, i.e., they are enriched in incompatible elements with highly fractionated LREEs and HREEs ((La/Yb)(N) = 8.42 similar to 21.60) without negative Sr and Eu anomalies. They show relatively low Sr (Sr-87/Sr-86 = 0.703848 similar to 0.704870) and high Nd (Nd-143/Nd-144 = 0.512617 similar to 0.513057), Hf (Hf-176/(177) Hf = 0.282873 similar to 0. 283001) isotope ratios, and Pb isotope ratios were Pb-206/(204) Pb = 17.2 similar to 17.9, Pb-207/Pb-204 = 15.3 similar to 15.4 and Pb-208/Pb-204 = 37.5 similar to 37.9. All these geochemical features, combined with petrographic observations and major element data, allow us to suggest that the Fanshi basalts were derived from small degree partial melting of asthenospheric mantle with contributions of metasomatized lithospheric mantle. Olivine and clinopyroxene dominated fractional crystallization is an important process in the petrogenesis of these basalts, which may have taken place in magma chamber of lithospheric mantle condition. The rapid ascent explains the lack of crustal contamination. Sumengzhuang samples are characterized by relatively deeper and lower extent of melting, whereas the Yingxian samples have the signature of slightly shallower and higher extent of melting. Together with studies of Cenozoic basalts in other areas near the gravity gradient zone, we suggest that the Cenozoic basalts near the Gravity Gradient zone may be originated from decompression melting of eastward asthenosphere flow when crossing the gravity gradient zone. This study offers some new perspectives on the petrogenesis of the Cenozoic basaltic volcanism in eastern China in general.
关键词: Cenozoic basalts ; Gravity gradient zone ; Geochemistry ; Formation mechanism ; Fanshi region ; North China Craton
作者部门: [Ye Lei ; Liu JinJu ; Guo PengYuan ; Sun Pu ; Cui HuiXia] Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China ; [Niu YaoLing] Univ Durham, Dept Earth Sci, Durham DH1 3LE, England ; [Niu YaoLing] Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
通讯作者: Ye, L (reprint author), Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China.
学科分类: Geology
文章类型: Article
所属项目编号: 国家自然科学基金项目
所属项目名称: 国家自然科学基金项目
项目资助者: NSFC
语种: 中文
ISSN号: 1000-0569
WOS记录号: WOS:000349509300012
CSCD记录号: CSCD:5337737
IR记录号: CSCD2766
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/120668
Appears in Collections:地质科学与矿产资源学院_期刊论文

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Recommended Citation:
Ye, L,Liu, JJ,Niu, YL,et al. Mantle sources and petrogenesis of the Cenozoic basalts in Fanshi, Shanxi Province: Geochemical and Sr-Nd-Pb-Hf isotopic evidence[J]. ACTA PETROLOGICA SINICA,2015,31(1):161-175.
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