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以云南鹤庆盆地HQ孔上部15~55m沉积物中2个不同种属的介形类壳体为研究对象,通过比较壳体中Sr/Ca,Mg/Ca之间及其与沉积物Sr含量的关系,得出以下结论:(1)壳体Sr/Ca,Mg/Ca首先反映的是该介形类生存的微生态环境;(2)壳体Sr/Ca较Mg/Ca更好地线性响应水环境的变化,但当体系中有文石结晶沉降时Sr/Ca不再线性响应湖泊水体盐度的变化;(3)壳体的Sr/Ca完全受控于湖水盐度及水体中自生碳酸盐矿物的结晶过程,而壳体中的Mg/Ca则受湖水盐度和温度控制,实际上温度只是壳体生长速率对壳体Mg/Ca控制的外在表现.建议在以后的古环境重建及室内培养实验时,更多地关注沉积物组成及其自生矿物结晶对生物壳体微量元素(如Mg/Ca,Sr/Ca)组成的制约.
Two species of Ostracoda from different sediments of 15-55 m above the HQ hole in Heqing Basin, Yunnan Province, China were studied. By comparing the contents of Sr / Ca, Mg / Ca and Sr in sediments (1) The shell Sr / Ca and Mg / Ca firstly reflect the microecological environment of the ostracod. (2) The shell Sr / Ca is better than Mg / Ca In response to changes in the water environment, Sr / Ca no longer linearly responds to changes in salinity of lake water when aragonite crystals settle in the system. (3) Sr / Ca in the shell is completely controlled by the salinity of the lake and spontaneous Carbonate minerals, while the Mg / Ca in the shell is controlled by the salinity and temperature of the lake. In fact, the temperature is only the external manifestation of the shell Mg / Ca control by the growth rate of the shell. In environmental rebuilding and indoor incubation experiments, more attention has been paid to the constraints on the composition of trace elements (such as Mg / Ca, Sr / Ca) in biological shells due to the composition of sediments and their authigenic mineral crystallization.