摘要
中国南方风化磷块岩中的风化磷矿的自然类型可分为两类七种型式，其中以“原位面型风化磷矿”和“位移溶洞砂砾磷矿”为主。风化磷矿是由其原矿的自身特性与外部适宜条件（水文地质条件为主导）综合作用的产物。根据碳酸盐、磷酸盐矿物分解、淋失程度可划分为弱风化、风化、强风化三个阶段。可用直接法。
With relatively high (weathering enrichment related) grade and suitability to abrading, the weathered phosphorites in South China draw increasing attention from the phosphate industry. The weathered phosphorites have two natural types: in situ and displaced,both, according to occurring mode, to be still grouped into seven subtypes.Over all the other subtypes, in situ weathered phosphorite subtype and displaced karst clastic phosphorite subtype prevail in terms of intensity of mineralization. Weathered phosphorites should be drived from the primary ones and when weathered, the latter would suffer from double impacts related, respectively,to its internal structures and to the external conditions. Weathering of phosphorites tends to go through, from weak to stong, three stages typical of partially leaching loss of carbonate minerals, wholly leaching loss of them and partially leaching loss of phosphate minerals. The weathered phosphorites are different, to a great degree, from the primary ones in many aspects, for example, thichness, grade, mineral composition, chemical composition, texture,structure, physicochemical characters, REE content and the like. Consequently,the two are easy to be distinguished only according to these differences. When geological prospecting is carried out for them, weathered phosphorites can be decided and located directly, indirectly and mathematically by using as many as 13 methods of which CO (CO 2%) , CP (CaO/P 2O 5) and DY (2P 2O 5+A.I) method are highly recommendable to planning the prospecting projects.
出处
《化工矿产地质》
CAS
1996年第3期196-200,共5页
Geology of Chemical Minerals
关键词
风化磷块岩
自然类型
形成条件
形成机制
磷块岩
weathered phosphorite, natural type, internal and external condition, South China
