| 钙质结核的微形态及矿物学特征 |
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| 引用本文： | 张民,马丽.钙质结核的微形态及矿物学特征[J].山东农业大学学报(自然科学版),1995,26(3):327-334,348. |
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| 作者姓名： | 张民 马丽 |
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| 作者单位： | 山东农业大学资源与环境学院 |
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| 摘 要： | 土壤中的钙质结核可分为软结核、硬结核和钙质硬盘３种形态，其化学组成以ＣａＣＯ３为主，矿质全量组成的各氧化物平均含量水平的顺序为：ＣａＯ〉ＳｉＯ２〉Ａｌ２Ｏ３〉Ｆｅ２Ｏ３〉ＭｇＯ〉Ｋ２Ｏ〉Ｎａ２Ｏ〉ＴｉＯ２〉ＭｎＯ〉Ｐ２Ｏ５。但在某些软结核中，ＳｉＯ２含量仍大于ＣａＯ含量。微形态分析结果表明，软结核为碳酸盐颗粒的胶结体，常嵌埋较多的土壤基质、石英、长石等粗颗粒；硬结核多为碳酸盐和方解石的胶结体，许多
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| 关 键 词： | 钙质结核 化学组成 微形态 矿物组成 土壤 |
MICROMORPHOLOGICAL AND MINERALOGICAL CHARACTERISTICS OF CALCAREOUS CONCRETIONS |
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| Zhang Min,Ma li,Luo Hongyi.MICROMORPHOLOGICAL AND MINERALOGICAL CHARACTERISTICS OF CALCAREOUS CONCRETIONS[J].Journal of Shandong Agricultural University,1995,26(3):327-334,348. |
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| Authors: | Zhang Min Ma li Luo Hongyi |
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| Abstract: | Calcareous concretions in soils can be divided into three forms:soft,hard and hard pan. The main chemical composition of calcareous is CaCO3 and the content order of total element oxide components is as follows:CaO>SiO2>Al2O3>Fe2O3>MgO>K2O>Na2O>TiO2>MnO>P2O5, but in some soft concretions,the content of SiO2 is higher than that of.CaO.Micromorphological analysis shows that soft calcareous concretions are cemented by carbonate particles and have a lot of soil matrix and quartz, feldspar coarse grains.Hard calcareous concretions and hard calcareous pan are composed of calcite and carbonate particles,and some large pores are filled with calcite as crystal chambers.Most calcareous concretions contain iron-manganese impregnations. With the development of calcareous concretions,the concentration of Ca and the developmental degree of calcite crystal increases gradually.Electron probe spectroscopy analysis gave the same results.X-ray diffraction analysis for the mineral composition of calcareous concretions illustrates that main minerals are calcite,and there aremany quartz and feldspar and a few iron and manganese minerals,but no dolomits.These results correspond well to the results of chemical,micromorphologlcal and electron probe spectroscopy analyses. |
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| Keywords: | calcateous concretion micromorphology mineralogy |
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