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对福建龙海牛头山新生代玄武岩中橄榄岩包体进行了傅利叶变换红外光谱(FTIR)分析,结果显示,二辉橄榄岩中的辉石包体含有结构水,均以OH的形式存在,结构水含量分别如下:单斜辉石为(151~845)×10-6,斜方辉石为(40~710)×10-6,全岩为(25~90)×10-6.无论是辉石中的水含量还是全岩中的水含量,福建牛头山地区均高于华北克拉通的安徽女山、河北汉诺坝和苏北盆地,而与同是华北克拉通的河北阳原地区水含量相当.实验证明辉石是牛头山地区上地幔重要的水储库.初步推断福建牛头山经历了洋壳俯冲作用及底侵作用.
FTIR analysis of peridotite inclusions of the Cenozoic basalts in the Longtou Mountain, Longhai, Fujian Province shows that the pyroxene inclusions in the lherzolites contain structural water, all of which exist in the form of OH. Water content is as follows: clinopyroxene (151 ~ 845) × 10-6, orthopyroxene (40 ~ 710) × 10-6, the whole rock is (25 ~ 90) × 10-6. Whether it is The water content of pyroxene is also the water content of the whole rock. The Niutoushan area in Fujian is higher than the female mountain in Anhui Province, Hannuoba in Hebei Province, and the Northern Jiangsu Basin. However, The water content is quite.The experiment proved that pyroxene is an important water reservoir in the upper mantle of Niutoushan area.It is preliminarily concluded that the Niutoushan of Fujian experienced the subduction of the oceanic crust and the underplating.