浙江沐尘石英二长岩体的岩石地球化学特征及构造意义   总被引：5，自引：0，他引：5  

卢成忠 《地球化学》2007,36(5):457-466

出露于江山-绍兴断裂带西南段东南侧的沐尘岩体,以发育暗色包体和环斑长石为特征,具有显著的岩浆混合作用.寄主岩为二长岩-石英二长岩组合,包体岩石为二长闪长岩.二长岩组合.造岩矿物有钾长石、斜长石、石英、普通角闪石和黑云母.岩石富碱(Na2O K2O=6.58%～10.42%,平均8.41%)、高钾(K2O/Na2O=0.72～1.45,平均1.16)、贫钛(TiO2=0.37%～1.22%,平均0.76%)、富集大离子亲石元素和轻稀土元素,具有钾玄质系列的岩石地球化学特征.该岩体侵位于后碰撞弧构造环境,是早白垩世早期该区重要的构造.岩浆热事件的产物.  相似文献   

冈底斯中段达布埃达克质含矿斑岩增厚下地壳熔融与斑岩铜钼矿成因     

《地质科技情报》2007,26(4):19-26

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典型构造蚀变岩型金矿远景资源量数学模型与预测   总被引：2，自引：0，他引：2  

王庆飞  万丽  刘学飞 《矿床地质》2007,26(3):341-345

数学模型是矿床深部资源量定量化预测一个重要手段,其中品位-吨位模型是一个广泛应用的数学模型,在该模型中,远景资源量为研究区源岩中成矿元素总量的函数。利用该模型,计算胶东构造蚀变岩型金矿远景资源量时,发现由于成矿源岩范围难以确定,而使模型应用准确性受到制约。基于断裂带蚀变岩型金矿的特征,修正了品位-吨位模型。在修正后的模型中,远景资源量为蚀变岩总质量的函数,另包括3个参数:蚀变区元素背景含量(由多标度分形决定)、元素工业品位及矿体品位分布分维值。利用修正后的品位-吨位模型,有效地估算了胶东大尹格庄金矿-1000m以上的理想金属量,得出远景矿石量为5.26×107t,金属量为2.89×105kg,与实际地质情况相吻合。  相似文献   

Cenozoic volcanic rocks in the Belog Co area, Qiangtang, northern Tibet, China： Petrochemical evidence for partial melting of the mantle-crust transition zone     

LAI Shaocong QIN Jiangfeng LI Yongfeng LIU Xin 《中国地球化学学报》2007,26(3):305-311

Neogene volcanic rocks in the Belog Co area, Qiangtang, northern Tibet, are represented by a typical intermediate-basic and intermediate alkaline rock association, with latite-trachyte as the main rock type. The results of chemical analysis are: SiO2=52%–62%, Al2O3>15%, Na2O/K2O>1 and MgO<3.30%. In addition, the volcanic rocks are LREE-enriched with LREE/HREE=10–13, (La/Yb)N=15–19, and show a weak negative Eu anomaly with δEu=0.71–0.89. The close relationship between Mg# and SiO2 and the co-variation of the magmatophile elements and ultra-magmatophile elements such as La/Sm-La and Cr-Tb indicate that this association of volcanic rocks is the product of comagmatic fractional crystallization. The rock association type and lower Sm/Yb values (Sm/Yb=3.23–3.97) imply that this association of volcanic rocks should have originated from partial melting of spinel lherzolite in the lithospheric mantle. On the other hand, the weak negative Eu anomaly and relative depletion in Nb, Ta and Ti reflect the features of terrigenous magma. So the Neogene Belog Co alkaline volcanic rocks should be the result of partial melting of the special crust-mantle transition zone on the Qinghai-Tibet Plateau.  相似文献   

Organic Material and Trace Elements of Bituminous Rocks in the Ozankiiy Field, Ankara, Turkey          下载免费PDF全文

Saday Azadoglu ALIYEV Ali SARI 《《地质学报》英文版》2007,81(4):658-667

Bituminous rocks in the Ozankoey （Ankara） field are different from those of the Paleocene- Eocene Mengen and Giineytepe （Bolu） regions in metal enrichment levels. Organic carbon （Corg） content of organic material-rich rocks in the Ozankoey （Ankara） field is 3.66-40.72% wt averaging 14.34%. The dominant organic materials are algae/amorphous accompanied by minor amount of herbaceous material （The dominant kerogen type is Type-I with a limited amount of Type-Ⅱ kerogen.）. The bituminous rocks in the Ozankoey field are enriched in heavy metals such as Ni, Mn, As and Cr. In comparison with the average enrichment values of dements, Ni, Mn, As and Cr in bituminous shales of the Ozankoey field are as about 4.38, 14.93, 10.90 and 5.58 times as average values. The average concentrations of these heavy metals are also as high as 215× 10^-6, 828 × 10^-6, 58.54 × 10^-6, and 148 × 10^-6 respectively. In addition, sorption properties of day and organic materials are also important for metal enrichments in the bituminous shales.  相似文献   

阜新盆地东梁区浅层致密砂岩气气源岩特征   总被引：2，自引：1，他引：2  

朱志敏  陈岑  孙祥 《地质找矿论丛》2007,22(1):71-75

为了解阜新盆地浅层致密砂岩气成藏条件,应用有机岩石学和有机地球化学方法,对气源岩特征开展研究.认为该区浅层致密砂岩气气源岩为沙海组四段泥岩、沙海组三段煤层和泥岩;气源岩厚度大且埋藏浅(＜1500 m),有机质丰度高(TOC＞2%),生烃潜力强;有机质类型沙海组四段为Ⅲ(偏ⅡB)型干酪根,沙海组三段为Ⅲ型干酪根;气源对比显示沙海组三段和沙海组四段气源岩与沙海组三段浅层致密砂岩气同源,浅层致密砂岩气紧邻源岩.表明研究区气源岩能生成大量天然气,利于形成浅层致密砂岩气藏.  相似文献   

某动力机器基础动力学分析     

孔垂烛  薛尚铃  尹菊丽 《岩土工程技术》2007,21(5):254-256

当动力机器基础体积较大时,采用《动力机器基础设计规范》(GB 50040-96)推荐的简化计算方法进行动力计算,计算结果可能具有较大的误差而不能用于工程设计,此时进行三维数值分析是必要的。在介绍弹性动力学分析的基础上,使用通用有限元软件ANSYS8.0,对某设备基础进行了模态分析和谐相应分析,得出了该动力机器基础的低阶固有频率准确值,以及该动力机器基础随外部荷载频率改变的振幅变化曲线,进而得出一些重要结论,为该工程设计提供了可靠参考。  相似文献   

Interactions between basalts and oil source rocks in rift basins： CO2 generation     

金强  许丽  万从礼  曾怡 《中国地球化学学报》2007,26(1):58-65

Basalts interbedded with oil source rocks are discovered frequently in rift basins of eastern China, where CO2 is found in reservoirs around or within basalts, for example in the Binnan reservoir of the Dongying Depression. In the reservoirs, CO2 with heavy carbon isotopic composition (δ13C>-10‰ PDB) is in most cases accounts for 40% of the total gas reserve, and is believed to have resulted from degassing of basaltic magma from the mantle. In their investigations of the Binnan reservoir, the authors suggested that the CO2 would result from interactions between the source rocks and basalts. As the source rocks around basalts are rich in carbonate minerals, volcanic minerals, transition metals and organic matter, during their burial history some of the transition metals were catalyzed on the thermal degradation of organic matter into hydrocarbons and on the decomposition of carbonate minerals into CO2, which was reproduced in thermal simulations of the source rocks with the transition metals (Ni and Co). This kind of CO2 accounts for 55%-85% of the total gas reserve generated in the process of thermal simulation, and its δ13C values range from -11‰- -7.2‰ PDB, which are very similar to those of CO2 found in the Binnan reservoir. The co-generation of CO2 and hydrocarbon gases makes it possible their accumulation together in one trap. In other words, if the CO2 resulted directly from degassing of basaltic magma or was derived from the mantle, it could not be accumulated with hydrocarbon gases because it came into the basin much earlier than hydrocarbon generation and much earlier than trap formation. Therefore, the source rocks around basalts generated hydrocarbons and CO2 simultaneously through catalysis of Co and Ni transition metals, which is useful for the explanation of co-accumulation of hydrocarbon gases and CO2 in rift basins in eastern China.  相似文献   

Deformation Mechanism and Stability of a Rocky Slope   总被引：1，自引：1，他引：1  

黄润秋肖华波  巨能攀赵建军 《中国地质大学学报(英文版)》2007,18(1):77-84

A high slope is located on the side of the spillway at a hydropower station in Southwest China, which has some weak inter-layers inclining outwards. Parts of the slope show heavy weathering and unloading. There appeared deformation and tensile crack either on the surface or on the afteredge of the slope during excavation, and under a platform （elev. 488 m）, two levels of slopes collapsed on the downriver side. Based on the investigation in situ and the analysis of the geological structure, the conceptual model of deformation and failure mechanism was erected for this slope. Furthermore, the deformation characteristics were studied with FLAC^3D numerical simulation. Comprehensive analysis shows that the whole deformation of the slope is unloading rebound in certain depth scope and the whole body does not slide along any weak interlayer. In addition, two parts with prominent local deformation in the shallow layer of the slope show the models of ＂creep sfiding-tensile cracking＂ and ＂slidlng-tensile cracking＂, respectively. Based on the above analysis, the corresponding project of support and reinforcement is proposed to make the slope more stable.  相似文献   

邯邢煤田岩浆侵入及对煤层煤质的影响   总被引：4，自引：0，他引：4  

刘福胜徐培武  郑荣华芮乐道 《中国煤田地质》2007,19(5):22-24

根据邯邢煤田岩浆侵入特点,分析岩浆侵入煤系层位与分布规律,岩浆侵入体的产状及岩性特征。邯邢煤田岩浆岩的侵入,不仅破坏了该区煤层的连续性和完整性,减少了煤炭的可采储量,并使煤层的物理性质、化学成分和工艺性能也发生了显著变化,致使煤质变差,煤炭工业价值降低。  相似文献