个旧岩浆杂岩地质地球化学及成因研究

燕山中晚期，个旧岩浆活动强烈，并形成基性、中性、酸性及碱性杂岩体。对此前人已做过很多工作，但对其成因机制并未做详细探讨。本文以神仙水花岗岩、卡房花岗岩及贾沙辉长-二长岩为研究对象采用XRF、ICP-MS、EMPA-1600等分析测试方法，对个旧岩浆杂岩体的元素地球化学特征做了详细的分析和总结，并初步得出以下结论： 1、贾沙辉长-二长岩富集LILE、LREE，相对亏损HREE，并具有富碱特征和Eu的弱负异常，说明其为富集地幔来源；但与OIB相比，具有Nb、Ta、Ti等元素的亏损，说明其受到地壳混染作用。 2、个旧花岗岩普遍具有高硅、高铝、富碱（尤其富钾）等特征。随着SiO2含量的增加，Al2O3、Fe2O3T、MgO、CaO、TiO2、P2O5的含量呈线性降低；当SiO2含量大于70%时，Na2O和K2O含量变化不大。 3、岩石类型上，个旧各花岗岩体的铝质系数A/CNK值为0.92～1.08，属于I型花岗岩；构造环境上，个旧花岗岩形成于大陆碰撞环境，为碰撞晚期或后碰撞构造环境；其主要成分来源于地壳，并有基性成分和酸性成分的混合特征。 4、初步研究表明，个旧花岗岩形成于与玄武质岩浆底侵有关的下部大陆壳重熔作用。

Hydroisomerization of long-chain alkane over Pt/SAPO-11 catalysts synthesized from nonaqueous media

SAPO-11 molecular sieves were synthesized from nonaqueous media. The effects of Si and Al sources as well as solvents on the catalytic performance of SAPO-11 were investigated by the hydroisomerization reaction of n-dodecane. The samples were characterized by XRD, XRF, N-2-adsorption, SEM, NH3-TPD, IR-NH3 and Si-29 CP MAS NMR. The SAPO-11 samples synthesized with tetraethoxysilane as the Si source showed higher Si incorporation contents than the SAPO molecular sieves prepared with polymeric Si sources (fumed silica and Si colloidal gel). The reaction results showed that Pt/SAPO-11 catalysts synthesized from ethylene glycol and glycerol media with the monomeric Si and Al sources (tetraethoxysilane, aluminum isopropoxide) exhibited higher catalytic activities than those catalysts with the polymeric Si or Al (pseudo-boehmite) sources, due to the larger external surface area and higher acidity of the former ones. Especially, the catalyst synthesized in an ethylene glycol medium possessed the highest catalytic activity. Over this catalyst, 88% conversion of n-dodecane was achieved at a low temperature of 250 degrees C.