Lianting Jiang , Chun'an Tang , Bin Gong , Zhen Chen , Tiantian Chen , Zhanjie Qin , Guoneng Chen
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引用次数: 0
摘要
一般认为大陆红床的形成与干旱气候有关。利用干燥的黑泥沉积物进行的加热实验(由 L.J. 和 G.C. 进行)也表明,变红可能是由于在无水条件下,在大约 150 ° C 时开始由鹅铁矿转化为血铁矿,温度升高到 450 ° C 与血铁矿的红色和峰值呈正相关。如果这一过程适用于大陆红床,则意味着红床的热起源是成岩温度高的结果,而不是在干旱气候下沉积的原因。也就是说,下沉的红床盆地是从下而不是从上加热的。在这里,我们通过从中国东南部的红床钻孔岩芯中获得的新证据进一步证实了这一观点,这些岩芯显示了从地表土壤到红床再到底部花岗岩的清晰地质剖面。数据显示,大陆红层的形成温度至少在150-400 °C之间,而底层花岗岩的形成温度通常高于600 °C。我们的研究结果表明,大陆红床事件与地球热循环之间可能存在联系。
Origin of continental red beds: Warming from above or heating from below?
The formation of continental red beds is generally considered to be related to an arid climate. Heating experiments (performed by L.J. and G.C.) using dried black mud sediment also demonstrate that the reddening may be caused by the transformation of goethite to haematite that begins at approximately 150 °C under anhydrous conditions, and increasing the temperature to 450 °C is positively correlated with the red colour and peak value of haematite. If this process applies to continental red beds, it implies a thermal origin of red beds as a result of high diagenetic temperatures rather than as the cause of their deposition under an arid climate. Namely, subsiding red-bed basins are heated from below rather than warmed from above. Here, we further strengthen this idea by new evidence from borehole cores drilled from red beds in SE China, showing a clear geological section from the surface soil to red beds to bottom granite. The data reveal that the continental red beds formed at least at a temperature within 150–400 °C, and the underlying granite usually formed at temperatures greater than 600 °C. Our results imply a possible relationship between continental red bed events and Earth's thermal cycles.