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通过环境磁学、沉积学、遗迹化石学与地球化学对牛38井厘米级红灰韵律层的综合研究发现红层中具明显的胶体凝聚现象,其磁化率值、总铁与游离铁含量较高,层内生物扰动作用相对较强,表明气候变化引起的化学沉积是控制韵律旋回的主因,底栖生物的潜穴活动促进了沉积界面处微化学环境的变化。经频谱分析等时序分析法的估算可知该红灰韵律层是受十年级与百年级主周期的控制,可能与太阳黑子或太阳磁场活动等天文周期有关。虽然此类天文周期对地球气候变化的影响能力也许不强,但由于化学沉积对气候变化反应灵敏,而且可能当时湖水化学环境正处于胶体沉积的临界值附近,因而水体化学性质稍有偏离即可导致韵律层的形成。
The comprehensive study on centimeter-level red-smoothed rhythm layer of Niu-38 wells by environmental magnetism, sedimentology, trace element fossils and geochemistry shows that there is obvious colloidal agglomeration in the red layer, and its susceptibility value, total iron content and free iron content High and intra-layer bioturbation is relatively strong, indicating that chemical deposition caused by climate change is the main reason for controlling rhyme cycle. Benthic activities of benthic organisms promote the change of micro-chemical environment at depositional interface. The results of spectrum analysis and other time series analysis show that the red-gray rhythm layer is controlled by the tenth and the hundredth graders, which may be related to the astronomical periods such as sunspots or solar magnetic field activity. Although such astronomical cycles may not have a strong impact on the Earth’s climate, they may be slightly biased due to chemical reactions that are responsive to climate change and possibly when the lake’s chemical environment is near the critical value of colloidal deposition Lead to the formation of rhythm layer.