我国南方红壤中坡缕石和海泡石的出现及起源初探

Occurrence and origin of palygorskite and sepiolite in some red soils of the southern China

坡缕石和海泡石是沙漠和干旱、半干旱地区土壤中常见的矿物，形成于高碱（ｐＨ９～１１）和富硅镁低铝环境中，在酸性红壤中还未见报道。在研究土壤矿物时，发现我国南方某些红壤中也存在这两种矿物，在收集的４７个红壤剖面中，有４个出现这两种矿物，它们分布于部分泥页岩和变质岩发育红壤的心土层和母质层的粉砂、细砂和粗砂中，在表土层和粘粒中无这些矿物存在。据初步分析，泥页岩发育红壤中的坡缕石系母质中遗留的（这些泥页岩沉积于碱性环境）。

This paper presented the occurrence of palygorskite and sepiolite in some red soils of the subtropics of China and discussed origin of those two minerals in this area The palygorskite and sepiolite in this area were mainly found in silt, fine sand and coarse sand fractions of some subsoils and parent materials of the red soils derived from gneiss and shale Palygorskite for red soil from shale was relic from parent material whereas palygorskite and sepiolite for red soils from gneiss might be formed from the alteration of amphiboles and pyroxene in parent materials