爱景山锶矿床的生物地球化学异常

BIOGEOCHEMICAL ANOMALY OF AIJINSHAN STRONTIUM DEPOSIT

爱景山天青石矿床位于长江中下游的溧水中生代火山岩断陷盆地中,矿体受断裂带控制,与龙王山组晶屑凝灰岩有密切的成因联系,是近年来新发现的火山热液型锶矿床。笔者在矿区踏矿时,发现长江中下游常见的植物种属呈现生态变异现象,其典型特征是植物的株、叶发红。为探明原因,在爱景山矿段,卧龙山矿段采集了18个种属近40个植物样品,为了进行对比,在南京近郊也采集了相同种属的近20个样品。原始样品在日光下干燥后,于500℃马弗炉中灰化,其灰分用发射光谱进行了半定量全分析。初步研究表明,爱景山锶矿床存在明显的生物地化异常,这种生物地化异常可作为该类型矿床的找矿标志。

Aijinshan strontium deposit,located in the Mesozoic volcanic basin,is closely related to crys- tal tuff of Long-wangshan formation and controlled by fracture zone.The author has sampled many kinds of plants growing on the deposit region and other bare region and test their strontium contents and carried out correlation between the same plant sampled in two regions.In the rese- arches,about 18 spicies of plants were sampled,e.g.rosa,vicia sative,solvia chinensis etc.As a results,the ash of plants growing on the deposit region contains more than 5000 ppm of stronti- um while the other one not containing any strontium.