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丰度关系法估算分离结晶岩浆岩系原始岩浆成分 总被引:3,自引:0,他引:3
幔源原始岩浆是分离结晶过程的起点,又是地幔的平衡或分离部分熔融的产物,在这种原始岩浆岩中元素丰度关系既遵守分离结晶规律,又遵守地幔部分熔融规律。根据原始岩浆的元素丰度关系的这种双重特性,以安底斯山脉火山岩系的稀土元素为例,阐明了由分离结晶的岩浆岩岩系成分恢复原始岩浆成分的原理,并厘定出原始岩浆元素丰度的估算方法。 相似文献
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金川超镁铁岩侵入体及超大型硫化物矿床的成岩成矿机制 总被引:20,自引:1,他引:19
金川超镁铁岩侵入体赋存有超大型硫化物矿床 .岩体中、西段为岩浆通道 ,岩相对称分带 ,矿体产于中部的纯橄榄岩和二辉橄榄岩中 ;东段产状较缓 ,岩相为垂直分带 ,矿体位于岩体底部 .各类岩石均具堆积结构 .岩石学和地球化学研究表明 :中西段以流动分异为主 ,东段为重力分异 ;原始岩浆属拉斑玄武质 ;块状矿石系压滤作用产物 ;后续岩浆的补给和混合补充了成矿物质 ;硫化物不混溶程度受挥发分制约 .对超大型岩浆硫化物矿床形成的必要条件作了阐述 相似文献
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Geochemistry and Petrology of Emeishan Basalts and Subcontinental Mantle Evolution in Southwestern China 总被引:1,自引:1,他引:1
Three major volcanic rock sequences in the P2β formation(Emeishan basalts)were sampled dur-ing a comprehensive study of the Late Permian volcanics associated with the Panxi paleorift in southwestern China .Two of the three sections-Emei and Tangfang are composed of continental flood basalts(CFB) while the third-Ertan is an alkalic center.Multi-element chemical analyses indi-cate a predominance of low MgO transitional quartz tholeiites at Emei and Tangfang,whereas the Ertan suite ranges from high-MgO alkaline olivine basalts to rhombic porphyry trachytes and quartz-bearing aegerine-augite syenites.Consanguineity of the rocks from the three sections is sug-gested by consistently high TiO2 ,K2O,incompatible trace elements and uniformly fractionated REE patterns typical of alkalic compositions,but antypical of CFB.Sr isotope data for ten Emei basalt samples(^87Sr/^86Sr=0.7066-0.7082)which show no correla-tion with Rb/Sr ratios (0.02-0.12) and Nd isotopes for two of the samples(^143Nd/^144Nd=0.51171-0.51174)are interpreted as being related to the mantle evolution.The primary magmas re-sponsible for all the three sequences have been modeled in terms of a uniformly metasomatized man-tle source.Trace element models support the derivation of the Emei and Tangfang primary magmas from 10-15 percent partial melting of spinel lherzolite,followed by fractional crystallization of olivive and clinopyroxene.The primary alkaline olivine basalts at Ertan are generated by 7-10 percent par-tial melting of a chemically equivalent source in the garnet-peridodite stability region.The assumed mantle composition is characterixzed by Rb=3.8-5.5 ppm,Sr=62-83ppm,Ba=45-64 ppm,La=3.8-5.6ppm,and Yb=0.46-0.57ppm.The proposed mechanism of regional mantle enrichment requires metasomatic stabilization of phlogopite which becomes depleted later during par-tial melting.Such enrichment is consistent with the models proposed for alkalic systems in which a large mantle diaper acts as the agent for upward enrichment as well as uplift and extension of the crust. 相似文献
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玄武岩类岩石大地构造环境的Th、Nb、Zr判别 总被引:53,自引:0,他引:53
本文通过研究Th、Nb、Zr的地球化学性质和判别机理,根据世界上典型大地构造环境区玄武岩类的Th、Nb、Zr数据,研究了Th、Nb、Zr判别玄武岩大地构造环境的地球化学机理,发现大同构造环境区玄武岩系的Th、Nb、Zr特征具有显著差异,其比值特征能将玄武岩形成的大地构造位置很好地划分出来,提出了判别玄武岩大地构造环境的Nb/Zr-Th/Zr双对数判别图,试图能较好地区分出大洋板块发散边缘,板块汇聚边缘,大洋板内,大陆板内及地幔热柱形成的玄武岩,得出了玄武岩大地构造环境判别的标志,指出了用Th、Nb、Zr判别玄武岩大地构造环境的方法。 相似文献
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堆积岩与岩浆岩成分趋势线的相互预测原理及方法 总被引:1,自引:0,他引:1
本文在讨论了同源岩浆分离结晶过程中堆积相与残余岩浆相元素丰度关系公式的基础上,提出了堆积岩与相对应的(同源同结晶阶段)岩浆岩(狭义)成分趋势线的相互预测法则,并以冰岛玄武岩-流纹岩系和攀西地区峨眉山玄武岩系及相对应的层状堆积岩为例,厘定了多期岩浆分离结晶成因堆积岩系与岩浆岩系成分趋势相互预测的作图方法。 相似文献
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