摘要
南京板桥——三山矶的“下蜀组”内,含有丰富的钙质结核。经X射线衍射、电子显微镜等分析,钙质结核的主要矿物成分是方解石,并有石英、长石、水云母、蛭石、绿泥石等伴生。腹足类化石作氨基酸外消旋分析,其时代为18,468y,可与老虎山等地^(14)C测年对比。它的形成受下列条件控制:(1) 原始黄土中CaCO_3含量高:(2) 黄土中孔隙度高:(3) 气候湿润,地势平缓。
The 'Xiashu Formation' in Banqiao-Sanshanji Contain abundant calcareous concretion. The X-ray diffracation patterns and the electron microscopic analyses show that the calcareous concretion are composed mainly of Calcite, accompanied by quartz, feldspar, hydromica, vermiculite, chlerite etc. The gastropoda fossils Amino acid recemization dating 18, 468y. , may be compared with ^(14)C dating of Laohushan, Nanjing. It's formation is controlled by the following conditions: (1) High content of CaCO3 in primitive loess, (2) High porosity in loess, (3) The moist climate and the flat land.
出处
《南京师大学报（自然科学版）》
CAS
CSCD
1990年第3期80-85,共6页
Journal of Nanjing Normal University(Natural Science Edition)
基金
国家自然科学基金
关键词
钙质结核
下蜀组
第四系
南京
Calcareous concretion, Xiashu Formation, Quaternary, Nanjing.
