钙质结核

椭圆形的钙质结核的长轴方向反映了地下矿化水的流动方向。

The long axes of the ellipsoidal shaped calcareous concretion reflected the direction of movement of mineralizing groundwaters .

冀西北黄土钙质结核形态及其成因动力学特征与地层环境意义

Form and genetic dynamics characteristics of calcareous concretion in the Loess of northwestern Hebel province and its stratigraphy significance

而钙质结核相对于母岩和土壤，Ce亏损，出现负异常。

But , negative Ce-anomaly is discovered in calcareous nodules while normal Ce content in parent rocks and vertisols .

OOZE求精技术自动化的探讨钙质结核放射性碳断代的研究

Research on automatic refinement of ooze

利用化学分析、X射线衍射、偏光显微镜和扫描电子显微镜等探讨云南省元谋盆地干润变性土钙质结核中的次生方解石的特征和形成过程。

Using such means as chemical analysis , X-ray diffraction pattern , polarizing microscopy and scanning electronic microscopy , this paper has discussed the features and formation processes of secondary calcites in calcium nodules within ustic vertisols in Yuanmou Basin , Yunnan Province .

江苏和山东海岸钙质结核及其地质意义

Calcretes in coastal zone of Jiangsu and Shandong provinces and its geological implication

钙质结核年龄具有由岸向海逐渐变年轻的分布特点。

Moreover , the age of calcareous nodules becomes younger from shore to sea .

钙质结核放射性碳断代的研究钙质结核的微形态及矿物学特征

Micromorphological and mineralogical characteristics of calcareous concretions

安徽淮北平原钙质结核土的分布及成因研究

Study on Distributing and Formation of the Calcareous Concretions Soil in Huaibei Plain , AnHui Province

南黄海海州湾外侧钙质结核特征及其成因的研究

Characteristics and the origin of the calcareous concretions outside the Haizhou Bay in Southern Yellow Sea

通过分析钙质结核的类型和成因，可以了解冲积体系的古地理特征。

The paleogeographic features of alluvial systems can be recognized by analysing the types and origins of calcareous cores .

冲积体系中的钙质结核是广泛存在的，其成因与沉积环境、沉积速率、气候和排水体系有关。

Calcareous cores are widespread in alluvial systems , and the origin of the cores is related to sedimentary environments , deposition rates , climates and drainage systems .

影响膨胀土强度的因素较多，如湿度、钙质结核、矿物成分与游离氧化物、裂隙发育程度等。

There are many factors affecting the strength of the swelling soil , such as humidity , calcium nodule , mineral constituent , free oxidate and fracture development .

黄土钙质结核的形成以成土作用为主，剖面下部钙质结核可能是由成土和地下水淀积作用综合而形成的。

Most of the calcareous concretions in the loess strata were formed by pedogenesis , where as the same in the substrata of loess profiles could be commonly formed by the illuviation of ground water and the pedogenesis .