Infrared study of the extreme carbon stars based on IRAS, 2MASS and ISO data     

Pei-Sheng Chen  Hong-Guang Shan 《Astrophysics and Space Science》2007,312(1-2):85-98

We collected 55 galactic extreme carbon stars from the published literature in this paper. Observational data from IRAS, 2MASS and ISO were analyzed. The results show that the infrared properties of extreme carbon stars are quite different to those for ordinary visual carbon stars. It is shown from IRAS and 2MASS photometric data that extreme carbon stars have much redder infrared colors not only in the far infrared, but also in the near infrared, hence they have much thicker ciucumstellar envelopes and mass loss. It is also indicated from IRAS Low-Resolution Spectra (LRS) and ISO Short Wavelength Spectra (SWS) that they have much redder infrared spectra from 2 μm to 45 μm. The above results are believed to be the signature of undergoing the last stages of AGB evolution for extreme carbon stars.  相似文献   

初论擦痕性质          下载免费PDF全文

钟嘉猷  单家增 《地质科学》1984,(4):429-434

用擦痕作为研究断裂两盘岩体相对位移的主要依据已有几十年的历史。大多数人认为,它只代表岩体最后一次运动时所留下的遗迹。但也有人把擦痕作为确定断裂两盘岩体活动方向的唯一标志,还有人用断裂面上不同方向的擦痕确定断裂多期活动的先后次序,为此,野外观察者常是用手抚摸断裂面上的平滑度,得出断裂两盘岩体的相对位移方向。  相似文献   

Modeling of co- and post-seismic surface deformation and gravity changes of M W 6.9 Yushu,Qinghai,earthquake     

Chengli Liu  Bin Shan  Yong Zheng  Ying Jiang  Xiong Xiong Key Laboratory of Dynamic Geodesy 《地震学报(英文版)》2011,(2):177-183

Based on the elastic dislocation theory, multilayered crustal model, and rupture model obtained by seismic waveform inversion, we calculated the coand post-seismic surface deformation and gravity changes caused by the Yushu M W 6.9 earthquake occurred on April 14, 2010. The observed GPS velocity field and gravity field in Yushu areas are disturbed by the coand post-seismic effects induced by Yushu earthquake, thus the theoretical coand post-seismic deformation and gravity changes will provide important modi...  相似文献   

西藏高烈度区农牧民安居工程中的试验数据知识和抗震模糊集     

陈珊  孙柏涛  杨玉成 《世界地震工程》2011,27(2)

通过振动台模拟地震试验,对5个模型结构的试验结果进行了分析。从大量的试验数据和图形信息中提取抗震知识,建立抗震设防三水准对应的试验地震动强度和模型破坏状态的模糊集,为西藏地震高烈度区农牧民安居工程中采用可经受住强烈地震的结构类型和抗震措施,提供了评估依据。  相似文献   

不同再生骨料掺量的中高剪力墙振动台试验研究   总被引：2，自引：0，他引：2  

张建伟  丹姗  曹万林  池彦忠 《世界地震工程》2011,27(2)

为了研究再生混凝土剪力墙的动力性能,进行了3个1/3缩尺的不同再生骨料取代率的中高剪力墙模型的模拟地震振动台试验,其中1个为普通混凝土剪力墙、1个为再生粗骨料混凝土剪力墙、1个为全再生骨料混凝土剪力墙。试验过程经历了剪力墙弹性、开裂和破坏阶段,实测并比较分析了各剪力墙在不同阶段的动力特性、动力反应及破坏形态。试验结果表明:再生粗骨料混凝土中高剪力墙具有和普通混凝土剪力墙相近的抗震性能,其墙体开裂时台面加速度输入降低9.7%,其弹塑性位移角达到1/120时台面加速度输入降低5.8%,经合理设计,可用于建筑结构。  相似文献   

玄武岩全岩元素含量快速、准确分析新技术:双铱带高温炉与LA-ICP-MS联用法   总被引：2，自引：0，他引：2  

朱律运  刘勇胜  胡兆初  高山  王晓红  田滔 《地球化学》2011,(5):407-417

全岩样品主元素和微量元素的准确测试是地球科学研究的重要手段和依据.传统溶液进样ICP-MS元素测试方法制样和测试所需周期较长(两周以上).相对溶液进样法而言,激光剥蚀系统与ICP-MS联用测试全岩粉末熔融玻璃的方法可以大大地提高测试效率.在前人研究基础上,针对前人熔融制样中Pb、Zn元素的严重丢失问题,研究了Pb、Zn...  相似文献   

四合屯玄武岩斑晶中单个熔体包裹体元素组成及其对岩浆演化的指示   总被引：7，自引：0，他引：7  

张春来  刘勇胜  高山  Zoltan ZAJACZ  胡兆初  高长贵 《地球化学》2011,40(2):109-125

玄武岩斑晶中熔体包裹体成分特征可以推断玄武岩源区物质组成,反映岩浆形成演化过程。利用LA—ICPMS对四合屯义县组玄武岩橄榄石、单斜辉石斑晶中单个熔体包裹体的元素组成进行了分析测试。研究结果表明,橄榄石、单斜辉石斑晶中的熔体包裹体在主、微量元素含量上表现出了比全岩更大的变化范围,但微量元素分配特征总体和全岩一致。单斜辉石斑晶中包裹体的CaO含量、CaO／Al2O3比值和Cr2O3含量随着单斜辉石Mg#值的降低而降低,反映了单斜辉石结晶分离的影响,Al2O3与Sr之间的显著相关关系则记录了斜长石结晶分离作用的影响,MgO—Ni和MgO—CaO／Al2O3的变化则反映了橄榄石的分离结晶作用。包裹体元素组成变化总体受橄榄石、单斜辉石和斜长石的结晶分离作用控制。结合前人研究成果,认为四合屯玄武岩在微量元素和同位素组成上的壳源组分特征可能部分地继承自原岩（即橄榄岩＋榴辉岩部分熔融体反应形成的（橄榄）辉石岩）,而不是岩浆上升过程中受地壳岩石混染的结果。高Mg#值单斜辉石斑晶中少量高Mg馆、高Si含量,低CaO、TiO2、Al2O3和微量元素含量的熔体包裹体反映玄武岩浆上升过程中受到了S1质岩石的混染,这与义县组玄武岩下伏地层为长城系大红裕组石英岩、石英砂岩的地质特征一致。因此,高Fo橄榄石斑晶中的熔体包裹体比采用向全岩中简单添加橄榄石方式计算出的原始熔体可能更能真实反映原始熔体组成。  相似文献   

Compressibility of strontium orthophosphate Sr<Subscript>3</Subscript>(PO<Subscript>4</Subscript>)<Subscript>2</Subscript> at high pressure     

Shuangmeng Zhai  Weihong Xue  Daisuke Yamazaki  Shuangming Shan  Eiji Ito  Naotaka Tomioka  Akira Shimojuku  Ken-ichi Funakoshi 《Physics and Chemistry of Minerals》2011,38(5):357-361

High pressure in situ synchrotron X-ray diffraction experiment of strontium orthophosphate Sr₃(PO₄)₂ has been carried out to 20.0 GPa at room temperature using multianvil apparatus. Fitting a third-order Birch–Murnaghan equation of state to the P–V data yields a volume of V ₀ = 498.0 ± 0.1 Å³, an isothermal bulk modulus of K _T  = 89.5 ± 1.7 GPa, and first pressure derivative of K _T ′ = 6.57 ± 0.34. If K _T ′ is fixed at 4, K _T is obtained as 104.4 ± 1.2 GPa. Analysis of axial compressible modulus shows that the a-axis (K _a  = 79.6 ± 3.2 GPa) is more compressible than the c-axis (K _c  = 116.4 ± 4.3 GPa). Based on the high pressure Raman spectroscopic results, the mode Grüneisen parameters are determined and the average mode Grüneisen parameter of PO₄ vibrations of Sr₃(PO₄)₂ is calculated to be 0.30(2).  相似文献   

济阳坳陷埕东凸起基底岩石组合、原岩恢复及地质意义   总被引：1，自引：0，他引：1  

孟凡超  邱隆伟  刘魁元  单宝杰  周鹏 《地质科学》2013,48(3):707-720

济阳坳陷埕东凸起太古界基底分布广泛,岩石类型丰富。岩心及显微薄片观察表明,岩石组合以花岗片麻岩、二长片麻岩和黑云母斜长片麻岩等各类片麻岩和石英闪长岩、花岗闪长岩等古老岩浆岩为主,少量石英岩、变粒岩等变质表壳岩以及云煌细晶岩、钾长花岗岩等年轻侵入岩脉。岩石地球化学分析及区域对比揭示,各类片麻岩的原岩为中酸性侵入岩,属于TTG质片麻岩,而石英岩和变粒岩属于变质表壳岩范畴,原岩为沉积岩。基底岩石构造样式为片麻岩或侵入岩形成构造穹窿,规模较小的变质表壳岩零星分布在周边。盆地基底岩石组合、变质岩原岩恢复与构造样式分析表明,渤海湾盆地覆盖区基底性质与露头区相似,是华北克拉通变质基底重要组成部分。这些认识对弄清盆地基底潜山油藏储层特征与展布具有重要指导作用,为深入研究变质岩潜山内幕油藏储层演化规律提供了依据。  相似文献   

Zircon U-Pb age, geochemical, and Sr-Nd-Pb isotopic constraints on the origin of alkaline intrusions in eastern Shandong Province, China     

Shen Liu  Caixia Feng  Ruizhong Hu  Shan Gao  Tao Wang  Guangying Feng  Youqiang Qi  Ian M. Coulson  Shaocong Lai 《Mineralogy and Petrology》2013,107(4):591-608

Alkaline intrusions in the eastern Shandong Province consist of quartz monzonite and granite. U-Pb zircon ages, geochemical data, and Sr-Nd-Pb isotopic data for these rocks are reported in the present paper. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U-Pb zircon analyses yielded consistent ages ranging from 114.3?±?0.3 to 122.3?±?0.4 Ma for six samples of the felsic rocks. The felsic rocks are characterised by a wide range of chemical compositions (SiO₂?=?55.14–77.63 wt. %, MgO?=?0.09–4.64 wt. %, Fe₂O₃?=?0.56–7.6 wt. %, CaO?=?0.40–5.2 wt. %), light rare earth elements (LREEs) and large ion lithophile elements (LILEs) (i.e., Rb, Pb, U) enrichment, as well as significant rare earth elements (HREEs) and heavy field strength (HFSEs) (Nb, Ta, P and Ti) depletion, various and high (⁸⁷Sr/⁸⁶Sr) _i ranging from 0.7066 to 0.7087, low ε _Nd (t) values from ?14.1 to ?17.1, high neodymium model ages (T_DM1?=?1.56–2.38Ga, T_DM2?=?2.02–2.25Ga), ²⁰⁶Pb/²⁰⁴Pb?=?17.12–17.16, ²⁰⁷Pb/²⁰⁴Pb?=?15.44–15.51, and ²⁰⁸Pb/²⁰⁴Pb?=?37.55–37.72. The results suggested that these rocks were derived from an enriched crustal source. In addition, the alkaline rocks also evolved as the result of the fractionation of potassium feldspar, plagioclase, +/? ilmenite or rutile and apatite. However, the alkaline rocks were not affected by crustal contamination. Moreover, the generation of the alkaline rocks can be attributed to the structural collapse of the Sulu organic belt due to various processes.  相似文献