| 三江地区中段地球化学省初探 |
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| 引用本文： | 沈上越,魏启荣,莫宣学.三江地区中段地球化学省初探[J].岩石矿物学杂志,2001,20(2):171-179. |
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| 作者姓名： | 沈上越 魏启荣 莫宣学 |
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| 作者单位： | 中国地质大学, |
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| 基金项目： | 国家自然科学基金资助项目(49772122);“九五”国家科技攻关计划资助项目(96-914-01-03);国土资源部“九五”科技攻关资助项目(95-02-001-02) |
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| 摘 要： | 三江中段可划分为(亲)扬子地球化学省与(亲)冈瓦纳地球化学省.前者上地幔岩有方辉橄榄岩和二辉橄榄岩,幔型元素(KT)富集,REE呈平坦&弱富集型;大洋火山岩以基性岩\亚碱性\洋脊型为主;铅同位素
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| 关 键 词： | 上地幔岩 大洋火山岩 铅同位素 扬子地球化学省 冈瓦纳地球化学省 |
| 文章编号： | 1000-6524(2001) 02-0171-09 |
A Preliminary Study of the Geochemical Provinces in the Central Part of SanjiangRegion |
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| SHEN Shang-yue,WEI Qi-rong,MO Xuan-xue.A Preliminary Study of the Geochemical Provinces in the Central Part of SanjiangRegion[J].Acta Petrologica Et Mineralogica,2001,20(2):171-179. |
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| Authors: | SHEN Shang-yue WEI Qi-rong MO Xuan-xue |
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| Abstract: | The central part of Sanjiang region can be divided into Yangtze(-phile) geochemical province and Gondwana(-phile) geochemical province. In the former province, the upper mantle rocks consist of harzburgite and lherzolite, characterized by the concentration of mantle type elements (KT) and the smooth_weak enrichment type REE patterns; the ocean volcanic rocks are dominated by basic rocks of subalkaline and oceanic ridge type; lead isotopes are noted for 206Pb/204Pb<18.5, 208Pb/204Pb<38.65, μ<9.35, ω<38.60, V1<75 and V2<65. In the latter province, the upper mantle rock is mainly harzburgite characterized by impoverishment of mantle type elements (KT) and the weak enrichment type REE patterns; the ocean volcanic rocks are comprised of ultrabasic, basic and intermediate_basic rocks, being both subalkaline and alkaline in nature and assuming both oceanic island type and oceanic ridge type; the characteristic lead isotope values are all higher than the above_mentioned values. |
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| Keywords: | central part of Sanjiang region upper mantle rock ocean volcanic rock lead isotope Yangtze(-phile) geochemical province Gondwana(-phile) geochemical province |
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