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根据小渡口剖面 2 8层有孔虫、介形虫、腹足类生物壳体的微观观察、微量元素及其比值、87Sr/86Sr与微量元素特征对比以及水 -岩反应87Sr/86Sr的混合模式 ,显示生物壳体遭受了埋藏后生作用 ,但对生物壳体原始的87Sr/86Sr比值基本没有改变或影响甚微 ,推测参与埋藏后生作用的流体与生物壳体具有相近的Sr同位素组成或较悬殊的Sr含量。同时 ,实际研究表明评价和判别埋藏后生作用对生物壳体原始87Sr/86Sr比值影响的方法较多 ,但各有其局限性 ;合理研究方法应以壳体87Sr/86Sr比值与微观特征和其他地球化学特征的对比来判别。
According to the microscopic observation, trace elements and their ratios, 87Sr / 86Sr and trace element characteristics and the mixed mode of water-rock reaction 87Sr / 86Sr in 28 layers of foraminifera, ostracods and gastropods in Xiaodudukou section , Indicating that the biological shell suffered a burial epigenetic effect, but the original 87Sr / 86Sr ratio had no change or little effect on the biological shell. It is speculated that the fluids involved in the burial epigenetic function have similar Sr isotopic composition or biological diversity Sr content. At the same time, the actual research shows that there are many ways to evaluate and discriminate the burial epigenetic effects on the original 87Sr / 86Sr ratio of biological shells, but each has its own limitations; a reasonable method should be based on 87Sr / 86Sr shell ratio and microscopic characteristics of the shell and other earth Comparison of chemical characteristics to distinguish.