福建前寒武纪蛇绿岩物质成分的研究

Geological Features of Precambrian Ophiolite in Fujian Province

福建前寒武纪蛇绿岩分布于政和、建阳、建瓯等地,往北可延至浙江龙泉。该蛇绿岩下部为堆晶橄榄岩、鬣刺状科马提岩等超镁铁质岩组合;上部为细碧角斑岩等镁铁质岩组合。其岩石化学、稀土元素和铅同位素均表现为洋中脊岩石特征,为古洋壳残片。

The Precambrian ophiolite in Fujian Province is distributed over the areas of Zhenghe,Jianyangand Jianou counties and to the north it can extend through to Longquan of Zhejiang Province.The lowerpart of the ophiolite is ultra-mafic rocks formed by crystal-accumulated peridotite and spinifex-shapekomatiite and the upper is maric rocks formed by spilite-karatophyre.The petrochemistry,rare-earth ele-ments and Pb isotope of the ophiolite have the same features as the oceanic ridge rocks,therefore,it isthe remnant flakes of palaeo-oceanic crust.