典型文献
Zircon micro-texture and chemistry:an investigation of magmatic history and crystallization temperature of quartz potassic syenite from Iwo area,Southwestern Nigeria
文献摘要：
The Neoproterozoic quartz potassic syenite of the Iwo area,Southwestern Nigeria has been investigated for its magmatic history and zircon saturation temperature.The zircon morphology showed irregular shapes with sectoral and oscillatory micro zoning.The majority of the zircon grains have embayment,which corresponds to magmatic resorption.The syenite crystallized from prob-ably multiple recharge of less evolved magma.Both the magma injection and subsequent crystallization of the rock occurred over a length of time giving the rock some degree of protracted thermal history and slight fluctuation in chemistry,which are manifested as zonation in the ana-lyzed zircon grains.The initial stage of zircon crystalliza-tion was marked by a lower cerium anomaly than the final stage,which indicates changes from lower oxidizing to higher oxidizing conditions.The protracted history does not affect the europium anomalies at any stage of crystal-lization.An average zircon saturation temperature of 865 ℃ estimated from titanium in zircon (TTiz ℃) ther-mometer using titanium activity of 0.7 (aTiO2 ～ 0.7) is taken as reasonable crystallization temperature of the rock.This is fairly consistent with 877 ℃ deduced from the zircon solubility model.The titanium in zircon temperature of 910 ℃ at aTiO2 ～ 1 is rather too high to be a useful estimate.Both the temperatures 865 and 877 ℃ are how-ever consistent with those of intermediate rocks.The size of the syenite and protracted crystallization history would have made the temperature to have impacted the meta-morphic envelope around the syenite.
文献关键词：
中图分类号：
作者姓名：
Ademuyiwa Adetunji;Valentin Y.Ganev
作者机构：
Department of Geology,Obafemi Awolowo University,Ile-Ife,Nigeria;Geological Institute,Bulgarian Academy of Sciences,1113 Sofia,Bulgaria
文献出处：
引用格式：
[1]Ademuyiwa Adetunji;Valentin Y.Ganev-.Zircon micro-texture and chemistry:an investigation of magmatic history and crystallization temperature of quartz potassic syenite from Iwo area,Southwestern Nigeria)[J].地球化学学报（英文版）,2022(01):39-49
A类：
Iwo,crystalliza,TTiz,mometer,aTiO2
B类：
Zircon,micro,texture,chemistry,investigation,magmatic,history,crystallization,quartz,potassic,syenite,from,area,Southwestern,Nigeria,Neoproterozoic,has,been,investigated,its,zircon,saturation,morphology,showed,irregular,shapes,sectoral,oscillatory,zoning,majority,grains,have,embayment,which,corresponds,resorption,crystallized,prob,ably,multiple,recharge,less,evolved,Both,injection,subsequent,occurred,over,length,giving,some,degree,protracted,thermal,slight,fluctuation,manifested,zonation,ana,lyzed,initial,stage,was,marked,by,lower,cerium,anomaly,than,final,indicates,changes,oxidizing,higher,conditions,does,not,affect,europium,anomalies,any,An,average,estimated,titanium,using,activity,taken,reasonable,This,fairly,consistent,deduced,solubility,model,rather,too,useful,temperatures,ever,those,intermediate,rocks,size,would,made,impacted,meta,morphic,envelope,around
AB值：
0.492524
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