区域化探数据在华南强烈风化区地质填图中的应用  

APPLICATION OF REGIONAL GEOCHEMICAL DATA IN GEOLOGICAL MAPPING IN STRONGLY WEATHERED AREA IN SOUTHERN CHINA

作　　者：吴俊[1] 卜建军[2] 谢国刚[1] 彭兴芳[2] 

机构地区：[1]中国地质调查局武汉地质调查中心,武汉430205 [2]中国地质大学(武汉)生物地质与环境地质国家重点实验室,武汉430074

出　　处：《地质力学学报》2016年第4期955-966,共12页Journal of Geomechanics

基　　金：中国地质调查局地质调查项目"特殊地质地貌区填图试点"(DD20160060);"广东1:5万筋竹圩;泗纶圩;罗定县幅强烈风化区填图试点"(12120114005901);"珠三角阳江-珠海地区海岸带1:5万填图试点"(DD20160064)

摘　　要：自区域化探全国扫面计划开始以来,区域化探数据在矿产勘查、环境、生态及农业等方面均发挥了很大作用,但对其在地质填图中的应用研究比较少。在中国南方花岗岩广泛分布的地区,化学风化强烈,风化层覆盖厚,植被发育,基岩裸露少,岩性识别和界线划分困难,严重影响了填图的速度和精度。通过对区域化探数据的处理分析,筛选特征指示元素编制地球化学图,发现对侵入岩体具明显指示的元素地球化学分区。通过野外实地验证,元素地球化学分区可以揭示不同期次侵入体的分布范围,利用元素地球化学分区可以有效提高强风化区地质填图的效率和精度。Since Regional Geochemistry-National Reconnaissance Program（ RGNR） carried out in1978,the immense amount of geochemical data obtained played a big role in mineral exploration,environmental,ecological and agricultural studies,but its application in geological mapping was quite less. In southern China,granites are widespread and covered by thick intense chemical weathered layers and vegetations,which severely affected the speed and accuracy of geological mapping. Some geochemical maps prepared by using regional geochemical data showed a significant geochemical partition. According to field validation,the chemical zones coincide well with the outcrops of granitic intrusions of different ages. So this can increases the efficiency and accuracy of geological mapping in strongly weathered areas.

关 键 词：区域化探 强烈风化 地质填图 侵入岩 华南 

分 类 号：P623[天文地球—地质矿产勘探] P632[天文地球—地质学]