摘要
通过浙江平山膨润土矿床的同位素年龄测定及氢和氧同位素地球化学研究，得出该矿床的成矿年龄为１１０Ｍａ左右，热液流体是来源于中生代大气降水的低温地热水，其成矿温度大致在７０～９０℃之间．从而，对膨润土形成于“表生作用”和“成岩作用”的观点提出了疑义，并探讨了低温热液蚀变的成因机制．
Isotope age and hydrogen and oxygen isotopic compositions were measured on the Na-montmorilloniteseparates from Pingshan bentonite deposit,Zhejiang Province.The minerogenetic age of about 110 Ma wasobtained by K-Ar dilution method.Stable isotopes show that the ore-forming fluid is low-temperaturegeothermal water,estimating in the range of 70～90℃,derived from the Mesozoic meteoric water.Thus,the possibility of ore-forming either by “supergenesis”or“diagenesis”of the associated volcanic materials isexcluded from Pingshan bentonite deposit.Authors proposed a genesis mechanism on low-temperature hy-drothermal alteration.
出处
《科技通报》
1995年第1期43-47,共5页
Bulletin of Science and Technology
基金
浙江省自然科学基金
关键词
膨润土矿床
同位素地球化学
矿床成因
bentonite deposit
metallogenetic age
isotope geochemistry
Zhejiang Province
