Jurassic volcanic

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3.

The Jurassic volcanic rocks are belong to K alkaline and came from shallow crust with weak repartition of magma .

侏罗纪为钾质碱性系列，古近纪为钙碱性系列，而且前者岩浆源较浅，岩浆分异作用差。

4.

Regional geological survey at the scale of 1: 250000 has mapped the late Cretaceous and middle-late Jurassic volcanic rocks in Nagqu area.

25万区域地质调查在那曲地区圈定出晚白垩世、中 -晚侏罗世火山岩。

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5.

Nature and tectonic environment of Late Jurassic volcanic -sedimentary basins in northwestern Hebei Province

冀西北晚侏罗世火山 -沉积盆地的性质及构造环境

6.