【摘要】 <正> 河北矾山辉石岩—钛榴石辉石正长岩—正长岩杂岩体,自发现大型磷灰石磁铁矿矿床以来,关于含矿层状岩带及其中的层状磁铁磷灰岩、磷灰岩的成因,已提出了各种不同的看法。本文提供氧同位素的一些资料,以利于磷铁矿床成因的讨论。更多还原

【Abstract】 The rock zone containing ore consists of layered ultramafic rock, the main rock types of which are diopsidite, biotite diopsidite, magnetite apatite rock, apatite rock, pegmatitic orthoclase biotite diopsidite and so on.BrFs technique was adopted in extracting oxygen from magnetite and diopside. The Isotope measurement has shown that 33 samples of magnetite have the δO18va-lues ranging from + 1.30%0to + 5.33%o while 27 samples of them have the δO18 rangingfrom +3.00%oto+4.50%o.13 samples of diopside have the δO18 values ranging from + 6.50%oto + 9.44%o.Oxygen isotope equilibrium temperature between magnetite and diopside is from 430°C to 780°C.更多还原