国内外海相大油气田的烃源岩均为粘土矿物含量较高的笔石页岩、油页岩和泥灰岩，形成于由台地向海槽过渡的深水斜坡环境。
High content clay mineral shale, oil shale and marlite are the main source rocks for large oil or gas fields in the world, which formed in deep water slopes between platform and open sea.
从主量元素（包括CIPW标准矿物组成）和过渡元素组成来看，该岩系近似原始岩浆组成。
The major elements (together with CIPW standard minerals) and transitional elements indicated that these dikes were similar to primitive magma.
从矿物化学所获得的温度-压力计算结果表明：岩浆来源应位于壳幔过渡带。
The calculated results of temperature and pressure from mineralogical chemistry show that magmatic source should lie in crust-mantle intermediate zone.
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