北京西山下苇甸中寒武统张夏组生物丘发育特征及其地质意义 The Bioherm and Geological Significance of Middle C

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dH"V;Bb0北京西山下苇甸中寒武统张夏组生物丘发育特征及其地质意义

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The Bioherm and Geological Significance of Middle Cambrian Zhangxia Formation at Xiaweidian Profile in West Hill, Beijing, China

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北京西山下苇甸剖面寒武系地层出露完整,中寒武统张夏组底部和顶部发育两期生物丘地层.通过野外观察及薄片鉴定发现,张夏组底部发育的生物丘为凝块石生物丘,顶部发育的为叠层石生物丘,两期生物丘的造丘生物主要为藻类.凝块石生物丘生长在低能的潮下带环境,而叠层石生物丘则形成于海水能量较高的潮间带或潮下带上部.不同的沉积环境造成了两期生物丘内部结构的差异,主要体现在造丘生物的排列方式上.根据该剖面两期生物丘的特征,总结了生物丘的发育模式,并对其地质意义进行了探讨.水利论文yV2r^;zM3b4}

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5W&l1f3xN/y.T.k^I W0北京西山下苇甸剖面寒武系地层出露完整,中寒武统张夏组底部和顶部发育两期生物丘地层.通过野外观察及薄片鉴定发现,张夏组底部发育的生物丘为凝块石生物丘,顶部发育的为叠层石生物丘,两期生物丘的造丘生物主要为藻类.凝...水利论文Qj8{tg6e

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