| 西南印度洋中脊玄武岩地球化学特征及其对岩浆过程的指示意义 |
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| 引用本文： | 韩宗珠,孙苑高,王传,孙晓霞,刘明,来志庆.西南印度洋中脊玄武岩地球化学特征及其对岩浆过程的指示意义[J].海洋地质动态,2021(1):11-19. |
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| 作者姓名： | 韩宗珠 孙苑高 王传 孙晓霞 刘明 来志庆 |
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| 作者单位： | 中国海洋大学海洋地球科学学院;海底科学与探测技术教育部重点实验室 |
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| 基金项目： | 国家自然科学基金(41376053);山东省自然科学基金(ZR2017PD002)。 |
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| 摘 要： | 对采自西南印度洋中脊(SWIR)50°E附近5个站位的玄武岩样品进行了岩石学和元素地球化学研究。样品主量元素、TAS分类图解和AFM图解显示,SWIR研究区样品类型主要为低钾拉斑玄武岩。相对原始地幔SWIR区玄武岩具有Ba、Nb、Sr负异常,K表现为正异常。稀土元素分配模式均为左倾型,具有轻微的Eu、Ce正异常;SWIR区玄武岩都起源于上地幔,SWIR玄武岩则明显向EMⅡ端元偏移。SWIR玄武岩地幔源区相对最为富集,可能为DM和EMⅡ的混合源区,存在少量的陆壳成分。研究区玄武质岩浆起源深度为尖晶石橄榄岩区域处于中度还原环境下,经历了明显的橄榄石+单斜辉石+斜长石的分离结晶。
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| 关 键 词： | 西南印度洋中脊 地球化学 玄武岩 岩浆过程 结晶分异 |
GEOCHEMICAL CHARACTERISTICS OF THE MORBS OF THE SWIR AND THEIR IMPLICATIONS FOR MAGMATIC PROCESS |
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| HAN Zongzhu,SUN Yuangao,WANG Chuan,SUN Xiaoxia,LIU Ming,LAI Zhiqing.GEOCHEMICAL CHARACTERISTICS OF THE MORBS OF THE SWIR AND THEIR IMPLICATIONS FOR MAGMATIC PROCESS[J].Marine Geology Development,2021(1):11-19. |
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| Authors: | HAN Zongzhu SUN Yuangao WANG Chuan SUN Xiaoxia LIU Ming LAI Zhiqing |
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| Institution: | (College of Marine Geosciences,Ocean University of China,Qingdao 266100,China;Key Laboratory of Submarine Geosciences and Prospecting Techniques,Qingdao 266100,China) |
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| Abstract: | Five fresh MORBs samples collected from the 50°E of the SWIR have been studied for petrology and geochemistry.The major elements,TAS and AFM diagrams suggest that the samples from the SWIR are dominated by low potassic tholeiite.The primitive mantle-normalized sprider diagram shows negative anomalies of Ba,Nb and Sr,while K is positive in all of the samples.The MORBs of the SWIR show a depleted pattern of light REE in chondrite-normalized REE diagram,with slightly positive Eu and Ce anomalies;The MORBs from the SWIR are all derived from the upper mantle and obviously migrate to the end member of EMII.Most of the SWIR basalts enriched in the region are sourced from mantle.It is composed of both DM and EMII,includes small amount of continental crustal components.The basaltic magmas of SWIR are originated from the spinel peridotite zone.The samples of the SWIR are formed under a moderate reducing environment,experienced obvious fractional crystallization from olivine,clinopyroxene to plagioclase. |
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| Keywords: | SWIR Geochemistry basalt magmatic processes crystallization differentiation |
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