摘要
本文通过X射线衍射图谱分析和透射电子显微镜照片鉴定,南极东胡安池塘沉积物中,存在着具有代表独特环境特征和沉积学特征的方解石、石膏、石盐和坡缕石等矿物。由于碳酸钙溶度积有效地控制硬石膏向方解石矿物转化机理,所以在盆地下表层细粒碎屑沉积物中方解石的含量偏高。东胡安池塘的原先深坑凹道可能是古地理年代中地震或火山爆发所造成,盆地内940,000×10~3kg可溶性盐类沉积物,也许是过去长期海浸—海退—海侵—海退的反复过程中,被侵蚀凝聚沉淀和期后冰川剥蚀的结果。
Through X-ray diffraction and transmission electron microscope photographs it is discovered that there are many minerals, such as Calcite, Cypsum, Halite and Palygorskite, which have a unique environment and special deposit features in the sediments of the Don Juan pond. Because the solubility product of carbonate calcium controlled the mechanism of transformation from Anhydrite to Calcite effectively, there was higher content of Calcite in the surface crumble sediments of the basin bottom.
The original deep holes and channels in the Don Juan Pond may be formed by earthquakes during the palaeogeographic years. The 940000 tons of dissolved salts deposited inside the basin may be the results from both the erosion condensation-deposit during a long repeating process of sea water invasion-regression-transgression and the erosion from the last glacier.
出处
《海洋湖沼通报》
CSCD
北大核心
1992年第4期12-18,共7页
Transactions of Oceanology and Limnology
关键词
南极
东胡安池塘
沉积环境
成因
Antarctic
Don Juan Pond
Sedimentary environment
