期刊论文

Study on geochemical behavior of high field strength elements during weathering of carbonate rocks: Evidence from leaching experiment on carbonate rock

中文

中国岩溶

1001-4810

2018

37

3

315-329

10.11932/karst20180301

国家自然科学基金项目(41373115) 南华大学“蒸湘学者计划”项目

本校为第一机构

选择黔中地区的一条白云岩原位风化剖面(平坝剖面)作为研究对象,通过对岩-土界面之下的岩粉层(砂状碳酸盐岩)动态淋溶过程中高场强元素( HFSE)地球化学行为的研究,并结合其在风化壳剖面的分布特征,获得了以下主要认识:( 1)碳酸盐岩风化过程中,HFSE间存在明显的分馏,而且元素分馏主要出现在岩-土界面作用过程中,即碳酸盐岩溶蚀形成残积土阶段;元素的地球化学惰性由强到弱的顺序依次为Zr>Hf >Nb>Sc>Th>Ta>Ti>Y,其中,Zr是最稳定的元素,Hf仅次于Zr,Nb和Sc也相对较为惰性,而Th、Ta、Ti、Y呈现出明显的活性;( 2)对于碳酸盐岩风化剖面的质量平衡计算,Zr是理想的参比元素(即惰性元素);( 3)由基岩酸不溶物...

It is generally believed that the high field strength elements ( HFSE,including Sc,Ti,Y,Zr,Nb,Hf, Ta,Th,etc.) are extremely inert in the epigenetic environment. However,it had been reported that there was a significant variation in the content ratio between above elements during the transition from the rock to soil in weathering profiles developed on carbonate rocks. At present,little is known about whether the fractionation between HFSE occurs or not during weathering of carbonate rocks,which needs further research. The karst area in southwest...