遵义地区岩石及土壤环境元素分布和农业地质环境评述

本文利用1∶50000遵义市、遵义县两幅区域地质调查成果等资料,对该区地层岩石及其风化土壤中环境微量元素地球化学背景、各时代地层岩石及其风化土壤环境微量元素分布特征及地球化学异常作了分析总结.进而作出了该区岩石及土壤的环境微量元素质量评述.重点认为,微量元素在土壤中的含量分区与成土母岩地层的平面分布关系十分密切,地层及岩性因素是土壤中元素分布的主导因素,从而形成了自然的土壤地球化学分区;区内存在三类土壤元素地球化学异常：一是由某些地层岩石风化而成（主要类型）,二是由地质构造及热液蚀变导致（次要类型）, 三是由矿产开发等人类活动造成（应高度关注的类型）;应当辩证看待微量必需元素的高背景地层及地球化学异常层,通过合理利用它们来为人类服务.

Mircroelements Distribution in the Rock and Soil and Appraisal for the Agrogeological Environment in the Zunyi Area

Taking advantage of information regarding regional geological reconnaissance as two maps of Zunyi City and Zunyi County with a scale of 1 to 50,000,the pursuit of the microelements in stratigraphic rocks and weathered soil is untaken with the objective of geochemical setting,distribution of various ages and geochemical anomaly,the appraisal is further made for microelement qualities in the rock and soil.Emphatically,considering the contents partition of the microelements in the soil that has intimate relation to the plane dispersion in strata of the pedogenic host rocks,the layers and the lithology are dominant factors for trace elements distributing in the soil,as a consequence,the pedogeochemical partition form in nature;there exist three types of geochemical anomalies of the soil elements in this area including: 1.primary type was generated from rock weathering of some strata;2.secondary one resulted from geologic structure and hydrothermal alteration;3.third one was originated by human activities such as minerals exploitation,which ought to be paid high attention;the strata of high setting for minor necessary elements and of geochemical anomaly should be regarded dialectically,and contribute to human society through rational exploitation.