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江汉盆地东部早中生代沉积地层碎屑云母成分:对大别高压-超高压岩石暴露作用的约束

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Keywords: 碎屑白云母,高压-超高压岩石,江汉盆地,早中生代

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Abstract:

碎屑白云母是碎屑岩中常见的、来自源区的稳定成分,可以用来指示源区性质,多硅白云母是碰撞造山高压-超高压变质岩石的特征矿物。对大别造山带同造山期沉积而成的江汉盆地东部上三叠统-中侏罗统砂岩碎屑白云母化学成分研究表明:上三叠统该区地层砂岩中碎屑白云母多以低硅白云母(Si<3.2)为特征,暗示此时大别造山带高压-超高压岩石很可能没有出露地表;自下侏罗统开始,砂岩中碎屑白云母中多硅白云母(Si>3.3)大量出现,中侏罗统砂岩多硅和低硅白云母发育,表明大别高压-超高压岩石在早侏罗世即已出露地表并经剥蚀搬运至盆地。这一结果从沉积学角度为约束高压-超高压岩石的折返时序和大别造山带演化提供了新的资料。

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