Application of the QUILF thermobarometer to the peralkaline trachytes and pantellerites of the Eburru volcanic complex,East African Rift,Kenya

Minghua Ren; Peter A.Omenda; Elizabeth Y.Anthony

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Application of the QUILF thermobarometer to the peralkaline trachytes and pantellerites of the Eburru volcanic complex,East African Rift,Kenya

机译：QUILF热压计在肯尼亚东非大裂谷Eburru火山群的高碱性滑石和pantellerite中的应用

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The Quaternary Eburru volcanic complex in the south-central Kenya Rift consists of pantelleritic trachytes and pantellerites.The phenocryst assemblage in the trachytes is sanidine+fayalite+ferrohedenbergite+aenigmatite+-quartz +-ilmenite+-magnetite +-pyrrhotite+-pyrite.In the pantellerites,the assemblage is sanidine+quartz+ferrohedenbergite+fayalite+aenigmatite+ferrorichter-ite+pyrrhotite+-apatite,although fayalite,ferrohedenbergite and ilmenite are absent from more evolved rocks (e.g.with SiO_2>71%).QUILF temperature calculations for the trachytes range from 709 to 793 deg C and for the pantellerites 668-708 deg C,the latter temperatures being among the lowest recorded for peralkaline silicic magmas.The QUILF thermobarometer demonstrates that the Eburru magmas crystallized at relatively low oxidation states (AFMQ +0.5 to -1.6)for both trachytes and pantellerites.The trachytes and pantellerites evolved along separate liquid lines of descent,the trachytes possibly deriving from a more mafic parent by fractional crystallization and the pantellerites from extreme fractionation of comenditic magmas.

机译：肯尼亚中部裂谷的第四纪埃布鲁火山火山综合体由泛铁质的长风钙铁矿和pantellerite组成.trachytes中的斑晶组合为Sanidine +铁橄榄石+铁锰铁矿+锂辉石+-石英+钛铁矿+磁铁矿+闪锌矿+黄铁矿+-黄铁矿。组合为Sanidine + Quartz + Ferohedenbergite + Fayalite + aenigmatite + ferrorichter-ite + pyryoite ++磷灰石，尽管演化程度更高的岩石（例如SiO_2> 71％）中不存在辉石，Ferohedenbergite和钛铁矿。 709到793摄氏度，以及膨润土668到708摄氏度，后者的温度是高碱性硅质岩浆的最低记录。QUILF温度晴雨表显示Eburru岩浆在相对较低的氧化态下结晶（AFMQ +0.5至-1.6）。无论是苗条还是苗条，苗条都是沿着单独的下降液体线演化的，苗条可能来自于亲本母体通过分步结晶而形成，而膨润土则来自本性岩浆的极端分馏。

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《Lithos: An International Journal of Mineralogy, Petrology, and Geochemistry》 |2006年第4期|共16页
作者
Minghua Ren; Peter A.Omenda; Elizabeth Y.Anthony;
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正文语种 eng
中图分类地质学;
关键词
Kenya; Eburru volcanic complex; Trachyte; Pantellerite; Peralkaline; QUILF;

机译：肯尼亚;埃伯鲁火山群;Trachyte;堇青石;高碱性;QUILF;

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1. Application of the QUILF thermobarometer to the peralkaline trachytes and pantellerites of the Eburru volcanic complex,East African Rift,Kenya [J] . Minghua Ren, Peter A.Omenda, Elizabeth Y.Anthony Lithos: An International Journal of Mineralogy, Petrology, and Geochemistry . 2006,第1a4期

机译：QUILF热压计在肯尼亚东非大裂谷Eburru火山群的高碱性滑石和pantellerite中的应用
2. Fractionation of Peralkaline Silicic Magmas: the Greater Olkaria Volcanic Complex, Kenya Rift Valley [J] . A. S. Marshall1 R. Macdonald12* N. W. Rogers3 J. G. Fitton4 A. G. Tindle3 K. Nejbert2 and R. W. Hinton4 Journal of Petrology . 2009,第2期

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Application of the QUILF thermobarometer to the peralkaline trachytes and pantellerites of the Eburru volcanic complex,East African Rift,Kenya

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