中文摘要：

利用地球化学分析,探讨龙门山甘溪泥盆系土桥子组灰岩和泥灰岩、不溶残余物以及烧失剩余物之间元素含量差异。通过对比它们之间的元素含量特征与相关性,结果表明SiO2、Al2O3、Fe2O3、K2O和TiO2的含量在灰岩和泥灰岩中差别很大,而在不溶残余物中含量则基本没有差别,在不溶残余物和烧失剩余物中的含量差别也很小;各元素与不溶残余物和烧失剩余物之间的相关系数均大于0.9,相互间的相关性也很好,表明其主要来源于陆源碎屑物,而且物质来源是一致的,它们基本不会受成岩作用的影响。MnO、MgO和FeO等组分在灰岩和泥灰岩中的含量相差不大,在不溶残余物和烧失剩余物中的含量差距略微增加,相关系数中等,为0.7~0.9,表明其主要来源于陆源碎屑物,但是受成岩作用的影响较大。Cr、Co、Ni、Zn和Ba等元素与不溶残余物相关系数低,反映它们之间的相关关系弱。龙门山甘溪土桥子组灰岩和泥灰岩地球化学分析的烧失剩余物中所反映的元素含量与成岩作用对应关系与不溶残余物是一致的,可以用于元素稳定性的研究。

英文摘要：

The difference of elem ent contents am ong lim estone, m arl and their insoluble residue andcom bustible residues of Devonian Tuqiaozi Form ation in Ganxi section, Longm enshan area is discussedon the basis of geochemical analysis. It is show ed that there is a great difference of m ajor elem entscontents, such as SiO2 , Al2O3 , Fe2O3 , K2O , TiO2, in lim estone and m arl, but no difference ininsoluble residues. In addition, the content difference of insoluble residues and burned residues is verysm all. T he correlation coefficients am ong elem ents, insoluble residues and burned residues are greaterthan 0.9 , indicating that they are m ainly from terrigenous detritus of consistent m aterial sources and the major elements are not affected by subsequent diagenesis. The content of some elements, such asM nO, MgO and S r, have little difference in limestone and marl. However？ the difference slightlyincreases in insoluble residues and burned residues with correlation coefficients in the range of 0. 7？0？ 9 , suggesting that they are mainly from terrigenous detritus, but influenced greatly by subsequentdiagenesis. The changes of element reflected by geochemical analysis of burned residues of limestoneand marl of Tuqiaozi Formation in Ganxi section are in accordance with that of insoluble residuesduring diagenesis, which can be used to study the stability of elements.