中国西部科技
中國西部科技
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SCIENCE AND TECHNOLOGY OF WEST CHINA
2009年
19期
1-3
,共3页
硅质岩%地球化学特征%柯柯亚%晚石炭世
硅質巖%地毬化學特徵%柯柯亞%晚石炭世
규질암%지구화학특정%가가아%만석탄세
Siliceous rocks%Geological and geochemical characteristics%Kekeya%Upper carboniferous
新疆柯柯亚一带晚石炭世硅质岩分布极为广泛,通过野外地质填图及矿产调查过程中的详细观察和硅质岩岩石学特征分析,并根据硅质岩具有低SiO2、K2O、P2O5及HREE;高Al2O3、FeO,MgO、K2O+Na2O、TiO2、∑ REE;SiO2/Al2O3、SiO2/(Na2O+K2O)值分别为11-25和37-74;Fe/Ti值小于20、(Fe+Mn)/Ti值一1、于15、Si/(Si+Al+Fe)值小于0.9等特征,认为这些硅质岩为火山成因.而且Th/Sc、Th/U和δ Ce等值及稀土配分曲线和TiO2-Al2O3图解也明确指示了硅质岩属火山成因类型.
新疆柯柯亞一帶晚石炭世硅質巖分佈極為廣汎,通過野外地質填圖及礦產調查過程中的詳細觀察和硅質巖巖石學特徵分析,併根據硅質巖具有低SiO2、K2O、P2O5及HREE;高Al2O3、FeO,MgO、K2O+Na2O、TiO2、∑ REE;SiO2/Al2O3、SiO2/(Na2O+K2O)值分彆為11-25和37-74;Fe/Ti值小于20、(Fe+Mn)/Ti值一1、于15、Si/(Si+Al+Fe)值小于0.9等特徵,認為這些硅質巖為火山成因.而且Th/Sc、Th/U和δ Ce等值及稀土配分麯線和TiO2-Al2O3圖解也明確指示瞭硅質巖屬火山成因類型.
신강가가아일대만석탄세규질암분포겁위엄범,통과야외지질전도급광산조사과정중적상세관찰화규질암암석학특정분석,병근거규질암구유저SiO2、K2O、P2O5급HREE;고Al2O3、FeO,MgO、K2O+Na2O、TiO2、∑ REE;SiO2/Al2O3、SiO2/(Na2O+K2O)치분별위11-25화37-74;Fe/Ti치소우20、(Fe+Mn)/Ti치일1、우15、Si/(Si+Al+Fe)치소우0.9등특정,인위저사규질암위화산성인.이차Th/Sc、Th/U화δ Ce등치급희토배분곡선화TiO2-Al2O3도해야명학지시료규질암속화산성인류형.
The siliceous rocks Upper Carboniferous in the neighborhood of Kekeya, Xinjiang distributes widely. The field geological mapping, commodity survey as well as the analyses on petrology of the siliceous rocks ,and they have geochemical characteristics of low SiO2, K2O, P2O5 and HREE content, high Al2O3, FeO, MgO, K2O+Na2O, TiO2 and ∑ REE content, SiO2/Al2O3, SiO2/(Na2O+K2O) difference is 11～25 and 37～74, Fe/Ti ratio less than 20, (Fe+Mn)/Ti ratio less than 15, Si/(Si+Al+Fe) ratio less than 0.9,and Th/Sc, Th/U ratio and δ Ce as well as chondrite-normalized REE curve and TiO2-Al2O3 diagram all indicates that the genesis of these siliceous rocks is volcano.
