摘要
世界各地和各时代煤层中火山灰分布十分广泛,对其研究不仅对煤层的对比、古环境和古地理方面有重要的理论意义,而且在煤矿和高岭石矿床勘探方面也有重要的实际意义。文章对近年来煤系地层中火山灰的时空分布、蚀变矿物组成、结构特征及化学特征和源区岩浆性质等方面的研究成果进行了综述,并指出了利用微量元素判别火山灰来源及构造背景时应注意的问题。
Tuff ver the world. The is a resource widely distributed within the seams from different coal - bearing strata all ostudies on the tuff are theoretically and practically significant not only for coal - bearing straia in correlation, reconstruction of palaeo - environment and palaeogeography, and also for coal and kaolin of prospecting. Recent years＇investigations in temporal and spatial distribution, altered mineralogical composition, texture, chemistry, and magrnatic attribution of the tuff are reviewed and some concerns are suggested in discriminating tufts sources and tectonic setting.
出处
《贵州地质》
2006年第2期114-118,共5页
Guizhou Geology
