摘要
本文作者在火山岩地区的新疆磁海、雅满苏和内蒙黄岗梁三个铁矿床进行野外工作的基础上,模拟火山气热液与次火山岩-火山岩(辉绿岩、安山质凝灰岩、安山岩和凝灰质砂岩)相互作用。实验结果证明了在380—700℃和(250—800)x105Pa的温度和压力下形成了与上述三个矿床相似的交代岩的矿物共生组合,并且从次火山岩-火山岩中萃取出TFe(11.89—3881.89mg/1)。由此可见,晚期火山气热液继续沿构造断裂上升,作用于沿途所经过的早先形成的次火山岩-火山岩,从中萃取出大量的铁,并在适宜的温度和压力等物理化学条件下形成了磁海、雅满苏和黄岗梁(西段)铁矿床。
The authors have made simulation experiments on the interactions of valcanic gas-hydrothermal solutions with subvolcanic-volcanic rocks (diabase, andesitic-tuff, andesite and tuffaceous sandstone) based on field observations of three iron ore deposits in volcanic rock areas of Cihai and Yamansu, Xinjiang and Huanggangliang, Inner Mongolia. The results of experiments has proved that paragenetic associations of the minerals of metasomatic rocks formed at 380—700℃ temperatures and (250—800)×0.1MPa pressures are similar to those in the aforementioned three iron ore deposits, are TFe=11.89—3881.89mg/1 is extracted from subvolcanic-volcanic rocks. It follows that metasomatism of the wall rocks of previously formed subvolcanicvolcanic rocks by late volcanic gas-hydrothermal solutions continuously rising along structural zones, led to the extraction of a great quantity of iron from these rocks and to the formation of the Cihai, Yamansu and Huanggangliang(western part)iron deposits under the favorable temperature, pressure, and other physico-chemical conditions.
出处
《岩石矿物学杂志》
CAS
CSCD
1991年第4期300-314,共15页
Acta Petrologica et Mineralogica
关键词
火山岩
交代岩
铁矿
experimental study
volcanic gas-hydrothermal solution
subvolcanic-volcanic rocks
metasomatism
formation of metasomatic rocks and iron deposits
