摘要
苏皖凹凸捧石粘土矿物包括沉积、风化及火山碎屑蚀变三种成因类型。成矿物质来源于内陆浅水湖盆水下玄武岩风化蚀变及地表玄武岩的风化。不同成因类型的凹凸棒石在矿物晶体结晶程度上有较大差异。通常,由风化作用生成并与碳酸盐共生的沉积型凹凸棒石结晶程度低,较纯的并与硅质岩共生的沉积型凹凸棒石结晶程度高。它们在红外吸收光谱特征上表现为:前者红外振动吸收带分裂程度低,吸收峰弱且峰形钝。后者红外振动吸收带分裂程度高,吸收峰尖锐。因此研究凹凸捧石的红外吸收光谱特征可基本上区分出它们的成因类型。本文还对凹凸棒石红外吸收光谱振动波数带进行了划分,并对相应的振动类型作了探讨。
There are three genetic types of attapulgite elay minerals in Jiangsu-Anhui area i. e. sedimentary, weathering and altered volcano-clastic types. The minerogenetie materials come from altered basalts in shallow lakes and weathered basalts on the earth surface. In general, these genetic types of attapulglte differ greatly in their crystallinity. The attapulgites formed from weathering or sedimentary processes are associated with carbonatite, their crystallinity is relatively bad. The sedimentary attapulgites in some cases are associated with silicolites, their crystallinity is better. The infrared absorption spectroscopic stripes of the former split in lower degree, the peak of their ID is not sharp, and peak-shape is lead, But the infrared absorption spectroscopic stripes of the latter split in higher degree, and absorption peaks of their ID are sharp relatively. So it is possible that genetic type of attapulgites can be distinguished by studying their infrared absorption spectroscopy characteristics.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
1990年第2期80-86,T001,共8页
Acta Petrologica Sinica
关键词
凹凸棒石
矿物
红外
吸收光谱
成因
Attapulgite
Infrared absorption
Genetic type
Jiangsu-Anhui area
