苦橄岩

苦橄岩、苦橄质玄武岩和玄武岩组成的熔岩层厚100～200m。

The lava layer composed of picrite , picritic basalt and basalts is 100 to 200 m thick .

铂族元素含量接近世界其他地区的苦橄岩，具有Pt/Pd<1和贫Os、Ir的特征。

The platinum-group element contents are close to those of picrite in other parts of the world , with Pt / Pd < 1 and low contents of Os and Ir .

新疆北准噶尔苦橄岩的发现及其地质意义

Discovery and geological significance of picritic rocks in north Junggar , Xinjiang

苦橄岩有橄榄石苦橄岩、橄榄石-辉石苦橄岩和辉石苦橄岩3种。

Picrite includes three types : olivine picrite , olivine – pyroxene picrite and pyroxene picrite .

苦橄白榴岩、橄榄白榴玄武岩为原生岩浆冷凝产物，由金云母二辉橄榄岩成分的上地幔经部分熔融（约3.5-4.3%）所形成。

Based on the petrology , geochemistry and calculation , we suggest that the picrite-leucitite and olivine-leucite basalt were solidified by primitive magma which derived from phlogopite-bearing lherzolite mantle by partial melting , the degree of partial melting is respectively 3.5 % and 4.3 % about .