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在西南极菲尔德斯半岛长城站地区发现有大量古海蚀龛 ,龛内保存有完整沉积剖面 ,通过对其中一个沉积剖面的粒度特征及元素组成的分析 ,确认该剖面是后期的湖相沉积 ,并据此恢复了距今 460 0年以来该地区古环境演化历史。结果表明 ,距今 40 0 0— 30 0 0年长城站区地表岩石化学风化作用较强烈 ,处于一个相对温暖的时期 ,这与湖泊沉积物、海洋沉积物等古环境记录载体的研究结果是一致的 ,证明古海蚀龛沉积可以作为研究南极无冰区和冰缘地区古环境演化历史的一种新的地质载体。
A large number of paleoclimatic alcoves were found in the Great Wall Station of the Fields Peninsula in the Western Antarctic. Complete sedimentary sections were preserved in the niche. The grain size and elemental composition of one of the sedimentary sections were analyzed to confirm that the section was lacustrine sedimentary facies As a result, the history of paleoenvironment evolution in the area since the 1960s was restored. The results show that the surface petrochemical weathering of the Great Wall Station area was intense over a period of 40 0-30-30 years and was at a relatively warm period, which was consistent with the paleoenvironmental record carriers such as lacustrine sediments , Which proves that the deposition of paleoceanic niches can be used as a new geological carrier for the study of paleoenvironmental evolution in the Antarctic ice-free and ice-rim regions.