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南天山托云盆地晚白垩世——早第三纪玄武岩的地球化学特征 …
引用本文:王彦斌,王 永,刘 训,傅德荣,肖序常,戚龙水.南天山托云盆地晚白垩世——早第三纪玄武岩的地球化学特征 …[J].岩石矿物学杂志,2000,19(2):131-139.
作者姓名:王彦斌  王 永  刘 训  傅德荣  肖序常  戚龙水
作者单位:1. 中国地质科学院地质研究所,北京,100037
2. 河北理工学院,唐山,063009
基金项目:新疆305项目,国土资源部国际合作与科技司资助项目,国家自然科学基金 
摘    要:托云盆地晚白垩世--早第三纪碱性橄榄玄武岩Sr、Nd、Pb同位素组成表明,本区玄武岩以低Sr、Pb和相对高的Nd同位素值(^87Sr/^86Sr为0.703554 ̄0.703884;^143Nd/^144Nd为0.512838 ̄0.512904;^206Pb/^204Pb为18.0063 ̄18.4720;^207Pb/^204Pb为15.4411 ̄15.5060;^208Pb/^204Pb为37.

关 键 词:南天山  玄武岩  地球化学  岩石成因  晚白垩世
修稿时间:1999-08-26

Geochemical Characteristics and Genesis of Late Cretaceous to Paleoene Basalts in Tuyon Basin, South Tianshan Mountain
Wang Yanbin,Wang Yong,Liu Xun,Fu Derong,Xiao Xuchang,Qi Longshui.Geochemical Characteristics and Genesis of Late Cretaceous to Paleoene Basalts in Tuyon Basin, South Tianshan Mountain[J].Acta Petrologica Et Mineralogica,2000,19(2):131-139.
Authors:Wang Yanbin  Wang Yong  Liu Xun  Fu Derong  Xiao Xuchang  Qi Longshui
Abstract:The Tianshan Mountain is believed to be a typical intracontinental mountain belt; the Tianshan Mountain was formed during tectonic amalgamation of the Tarim and Tianshan block and the Siberian carton in Late Carboniferous-Permian period. A series of basaltic extrusive and intrusive units were emplaced primarily in Late Cretaceous-Plaeogene sedimentary rocks in Tuyon basin and its adjacent area, South Tianshan Mountain. Geochemical data of basalts show low Sr and Pb isotopic values and relative high Nd values (87Sr/86Sr=0.703554~0.703884;143Nd/144Nd = 0. 512838 ~ 0. 512904;206Pb/204Pb = 18. 0063 ~ 18.4720;207Pb/204Pb=15.4411~15.5060;208Pb/204Pb=37.8072~37.9290). The data of major elements, trace elements and rare earth elements indicate that these basaltic rocks are similar to alkaline basalts of Hawaiian type oceanic silands. According to Nd/Sr isotopic ratios, the Tuyon basalts might have originated from low_grade melting of a source (mantle plume) similar to that beneath the Hawaiian Islands. In Tuyon basin and adjacent areas, several fields of Cenozoic alkaline basaltic magmatism may be related to the Cenozoic activity of mantle plumes.
Keywords:south Tianshan Mountain  geochemical characteristics  alkalic basalts  genesis
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