【摘要】 房山岩体是华北板块内部中生代活化的中酸性岩浆,经高角度底辟式均衡缓慢上侵并刺穿核部,最后定位于中深成环境下的穹窿状复式侵入体。它的矿物组合、岩石化学、微量元素及氧、氢、锶同位素组成均具Ⅰ型花岗岩特征。四次配位铝、铁镁、及氧和氢同位素在共生矿物之间的分配基本上达到了平衡。早期次岩石中黑云母的f_H20低于2kb,而晚期次的高于2kb,结合岩石结构,表明岩浆演化到晚期挥发份已达到过饱和并游离出一定的流体相。研究表明,房山岩体的物质来源主要是太古界基底的中基性变火成岩。太行山构造岩浆带,从南到北其岩石组合由偏基性到偏酸性的展布表明其源区深度南深扎浅,也反映了该区上地幔隆起程度南高北低的大地构造背景。更多还原

【Abstract】 Fang Shan intrusion is a domed composite one lain inside north cbanese plate.The magma had been made during Mesozoic era, afterwards slowly diapiriclly uprised and pricked kernel position,finaly emplaced at mesogene-tic environment.All its mineral association,petrochemistry,trace elements and O, H, Sr isotope composition show characteristics of ’I-type’ granites. And the partition of four coordinate Al, Fe,Mg and O,H isotopes between coexist minerals accomplished fundamentally equilibrium state.The FH2O of biotites in earlier magma episode are lower than 2kb, however, those in later, surpass 2kb, simultaneously to consider textures of the rocks, it can be indicated that volatile component contents of the magma surpassed saturation during later stage of magma evolution and fractionated out some fluid phase. Moreover, it may be also indicated that source area of Fang Shan intrusion consist mainly of intermediated and basic metaigneous rocks of Archean group which were derived from the earth’s mantle.The rock associations of tectonic-magmatic belt in Tai Hang mountain, from south to north, evolve from intermediate-basic to intermediate-acid one,reflect their source depth, deeper at south but shallower at north; reflect also sucha tectonic setting, that is, levels of rise for the upper mantle are higher at south but lower at north .更多还原