昭平、惜福和哈密铁陨石的矿物岩石学研究和化学群分类     

林素  徐伟彪 《天文学报》2007,48(3):328-342

详细分析了中国新近发现的3块铁陨石即：昭平、惜福和哈密的矿物组成和化学成分，并根据它们的化学元素（Ga、Ge、Ni和Ir等）含量进行了分群；昭平和惜福铁陨石分别属于IAB的低Ni低Au亚群和ⅢCD铁陨石群，哈密铁陨石因为其本身的Ga和Ge的含量很低以及实验仪器的精度限制，只能得知该陨石的Ga含量小于2ppm、Ge含量小于10ppm，根据其化学元素含量、结构特征和矿物组成，初步判断哈密铁陨石应属于未分群铁陨石．  相似文献   

GRACE卫星关键载荷实测数据的有效处理和地球重力场的精确解算   总被引：15，自引：6，他引：9       下载免费PDF全文

郑伟  许厚泽  钟敏  员美娟  周旭华  彭碧波 《地球物理学报》2009,52(8):1966-1975

首先对美国喷气推进实验室（JPL）公布的2007-06-01～2007-12-31时间段内的GRACE Level 1B卫星GPS轨道位置和速度、K波段系统星间速度、加速度计非保守力以及恒星敏感器姿态实测数据对应进行了轨道拼接、粗差探测、线性内插、重新标定、坐标转换、误差分析等有效处理;其次,基于改进的能量守恒法恢复了120阶GRACE地球重力场,在120阶处累计大地水准面精度为25.313 cm;最后,检验了本文地球重力场模型IGG-GRACE的可靠性,同时分析了IGG-GRACE解算精度在低频部分略优于德国波兹坦地学研究中心（GFZ）公布的EIGEN-GRACE02S地球重力场模型,而在中高频部分略低的原因.  相似文献   

离子探针测试方法及其在矿物微区微量元素和同位素分析中的应用   总被引：6，自引：0，他引：6  

徐伟彪 《高校地质学报》2005,11(2):239-252

离子探针能在单矿物颗粒内进行微区原位直接分析工作,主离子束斑大小可聚焦在5μm以内,可以检测到10^-9级的微量元素,同位素分析的精度高达1‰,在地球科学领域有着广泛的应用。详细叙述了离子探针的工作原理以及微量元素成分和同位素组成的测试方法,列举了其在天体化学和地球化学研究领域的主要应用,总结了一系列的研究成果,并首次公开发表离子探针微量元素测试技术研发工作中取得的一些实验结果。  相似文献   

Ion Probe Study of Silicate Inclusions from Colomera （IIE） Iron Meteorite： the Rare Earth Element Perspective     

HSUWeibiao 《《地质学报》英文版》2004,78(5):1060-1074

Coupled with a petrographical study, I carried out an ion probe study of rare earth element microdistributions in mineral phases of silicate inclusions from the Colomera IIE iron meteorite. Most mineral grains have homogeneous REEs, but show considerable inter-grain variations by a factor of 2 to 100. The whole rock REE abundances for Colomera,estimated by combining REE data with modal abundances, are relatively LREE-enriched with REEs of～10’CI, which suggest that Colomera silicates were highly differentiated and might represent a low degree partial melt (-10%) of a chondritic source. REE geochemistry of Colomera silicate inclusions points to an origin that involves differentiation,dynamic mixing, remelting, reduction, recrystallization, and subsequent rapid cooling near the surface of a planetary body.  相似文献   

地幔热柱动力学研究的新进展   总被引：6，自引：3，他引：6  

熊熊  滕吉文  许厚泽 《地球物理学进展》2001,16(1):62-69

由于地幔热柱对我们了解地球动力学和地幔动力学过程具有非常重要的科学意义，因此受到国际地学界的广泛关注，近年来，随着一系列国际研究计划的展开和实施，热柱动力学的研究取得了很大的研究。本文拟合“国际热柱－岩石圈相互作用研讨会”的讨论内容，对热柱领域已取得的进展和存在的问题作一简要的回顾，以期待进我国热柱动力学研究的发展有所埤益。  相似文献   

Accurate determination of calibration factor for tidal gravity observation of a GWR-superconducting gravimeter   总被引：4，自引：0，他引：4  

孙和平  陈晓东  许厚泽  王勇 《地震学报(英文版)》2001,14(6):692-700

Introduction The superconducting gravimeters (SGs) are widely used to observe the change in temporal and spatial gravity field by many countries along the world, considering their characteristics as of the high-precision, good continuity and stability. By using the temporal variation of the tidal grav-ity obtained from the global network of SGs, the Global Geophysics Project (GGP) aims at some hot problems in geophysics and geodynamics (SUN, HSU, 1997). The original observations of the c…  相似文献   

A Petrographic and Mineralogical Study of Volcanic Rocks from the Mayaxueshan Area, North Qilian Fold Belt, NW China     

HSU Ta-Wei  SHAU Yen-HongDepartment of Marine Resources  National Sun Yat-Sen University  Kaohsiung  China 《《地质学报》英文版》2002,76(1):15-30

The Ordovician volcanic rocks in the Mayaxueshan area have been pervasively altered or metamorphosed and contain abundant secondary minerals such as albite, chlorite, epidote, prehnite, pumpellyite, actinolite, titanite, quartz, and/or calcite. They were denoted as spilites or spilitic rocks in terms of their petrographic features and mineral assemblages. The metamorphic grades of the volcanic rocks are equivalent to that of the intercalated metaclastic rocks. This indicates that both the spilitic volcanic rocks and metaclastic rocks in the Mayaxueshan area have formed as a result of Caledonian regional metamorphism. We suggest that the previously denoted spilitic rocks or altered volcanic rocks should be re-denoted as metabasalts or metabasaltic rocks. The metamorphic grade of the volcanic rocks increases with their age: prehnite-pumpellyite facies for the upper part of the Middle Ordovician volcanic rocks, prehnite-pumpeilyite to lower greenschist facies for the lower part of the Middle Ordovician vol  相似文献   

测高-重力边值问题的局部剪裁解   总被引：1，自引：0，他引：1  

许厚泽  陆洋  张克非 《测绘学报》2002,31(Z1):12-15

给出了基于最小方差原理的测高-重力超定边值问题解的局部建模剪裁解法,并采用由卫星测高资料计算的6′×6′海洋重力异常和30′×30′大地水准面数据,计算了展开到1 800阶次的中国南海及邻近海域的测高-重力试验模型.与其他模型比较表明,这种由超定剪裁法解得到的局部模型能够较好地改善重力场模型中波长部分的精度.  相似文献   

Time Series Correlated Error''''s Simulation Scheme with the Application to Simulate the Ephemerides Error of CHAMP     

SHEN Yun-zhong  HSU Hou-tse 《测绘学报》2002,31(Z1):27-30

Computer simulation experiment is very important in the phase of project design, the availability of simulated result highly depends on the scheme of error simulation. Time series observations are normally correlated. This paper first discusses the formula of correlated error propagation, then derives the formula of simulating time series correlated errors. This formula is then used to simulate correlated ephemerides errors of CHAMP, then the ephemerides are used to recover the gravity vector at satellite altitude with finite differential formula. The formulae derived in this paper are verified with the difference between the recovered gravity vectors and the `true values' which are directly computed with the same gravity model as that generating the ephemerides.  相似文献   

中国固体潮观测研究   总被引：4，自引：0，他引：4       下载免费PDF全文

P.Melchior  方俊  B.Ducarme  许厚泽  M.Van Ruymbeke  李瑞浩  C.Poitevin  陈冬生 《地球物理学报》1985,28(2):142-154

本文讨论了在中国北京、武汉、上海、昆明、兰州、乌鲁木齐、广州、沈阳和青岛等九处的固体潮观测结果,并且与具有海洋和液核的地球模型进行了比较。文中特别讨论了仪器标定问题。结果表明了模拟固体潮效应的精度达到了0.6μgal。  相似文献