遂宁机场夏季雷暴的客观预报

本文利用2002~2006年6~8月的地面观测资料和常规天气图,采用多因子综合相关法进行回归统计,并采用极值剔除法对样本资料进行消空处理,建立雷暴的预报方程,统计结果及试报效果表明,该预报方程在遂宁机场雷暴的预报中有一定的作用。     

The Antarctic achondrite,Grove Mountains 021663: An olivine‐rich winonaite

Abstract– The Grove Mountains (GRV) 021663 meteorite was collected from the Grove Mountains region of Antarctica. The meteorite is composed primarily of olivine (Fa_5.4), orthopyroxene (Fs_4.7Wo_3.0), chromian diopside (En_53.6Fs_2.4Wo₄₄), troilite, kamacite, and plagioclase (Ab_74.5Or₄An_21.5). Minor phases include schreibersite and K‐feldspar. The meteorite is highly weathered (W3) and weakly shocked (S2). We determine a whole rock oxygen isotopic composition of δ¹⁸O = 7.50‰, δ¹⁷O = 3.52‰. Comparisons of these data with other primitive achondrites have resulted in the reclassification of this meteorite as a member of the winonaite group. The occurrences of troilite, metal, and schreibersite in GRV 021663 indicate that these minerals were once completely molten. Euhedral inclusions of pyroxene within plagioclase further suggest that these may have crystallized from a silicate melt, while the depletion of plagioclase, metal, and troilite indicates that GRV 021663 could represent a residuum following partial melting on its parent asteroid. Trace element distributions in silicate minerals do not, however, confirm this scenario. As with other winonaite meteorites, the formation of GRV 021663 probably relates to brecciation and mixing of heterogeneous lithologies, followed by varying degrees of thermal metamorphism on the parent body asteroid. Peak metamorphic conditions may have resulted in localized partial melting of metal and silicate mineralogies, but our data are not conclusive.     

The Meteoritical Bulletin,No. 111

Meteoritical Bulletin 111 contains the 3094 meteorites approved by the Nomenclature Committee of the Meteoritical Society in 2022. It includes 11 falls (Antonin, Botohilitano, Cranfield, Golden, Great Salt Lake, Longde, Msied, Ponggo, Qiquanhu, Tiglit, Traspena), with 2533 ordinary chondrites, 165 HED, 123 carbonaceous chondrites (including 4 ungrouped), 82 lunar meteorites, 28 Rumuruti chondrites, 27 iron meteorites, 23 ureilites, 22 mesosiderites, 22 Martian meteorites, 21 primitive achondrites (one ungrouped), 17 ungrouped achondrites, 13 pallasites, 7 enstatite achondrites, 6 enstatite chondrites, and 5 angrites. Of the meteorites classified in 2022, 1787 were from Antarctica, 1078 from Africa, 180 from South America, 34 from Asia, 6 from North America, 4 from Europe, and 1 from Oceania.     

武汉市城镇化与房地产发展耦合协调度分析

利用变异系数法、改进的TOPSIS法、耦合协调度模型,对武汉市2002—2013年城镇化与房地产发展协调性进行测度。研究结果表明:1 2002—2013年12年间武汉市城镇化水平与房地产发展状况均呈不断增长态势,城镇化发展综合指数由2002年的0.083 7发展到2013年的0.865 9,房地产发展综合指数由0.306 4上升到0.682 8;2研究期内,武汉市城镇化与房地产发展耦合协调度指数逐年递增,共经历了中度失调、轻度失调、濒临失调、勉强协调与初步协调5个阶段,到2013年底也仅处于初步协调阶段。因此,需要在城镇化推进过程中合理确定城市定位以及城市的主导产业,引导房地产有序发展。     

Classification of 24 New Ordinary Chondrites from the Grove Mountains, Antarctica

Petrography and mineral chemistry of 24 ordinary chondrites from the Grove Mountains, Antarctica, have been studied in order to identify their chemical-petrographic types. These samples were selected from a total of 4448 Grove Mountains (GRV) meteorites collected during the 19th Chinese Antarctic Research Expedition so as to make an estimation of the large GRV meteorite collection. The chemical-petrographic types of these meteorites are presented below: 1 H3,2 H4, 4 H5, 2 H6, 1 L4, 7 L5, 5 L6, 1 LL4 and 1 LL6. The new data weaken the previous report that unequilibrated ordinary chondrites are unusually abundant in the Grove Mountains region. However, this work confirms significant differences in distribution patterns of chemical-petrographic types between the Grove Mountains and other     

宁夏盐池县沙边子研究基地沙漠化土地的整治和效益

宁夏盐池县沙边子沙漠化土地整治研究基地位于毛乌素沙地西南部半干旱农牧交错区。1985年, 我所与当地政府协作进行沙漠化土地整治的试验研究工作。根据当地的自然条件, 以牧为主, 农林牧结合多途径开发利用农业资源的发展方向, 进行综合整治规划, 采取合理调整土地利用结构, 科学利用地下水资源, 对不同的土地类型因地制宜采取整治措施。经三年来的实施, 初步建立起高效人工生态系统, 使经济效益、社会效益和生态效益得到了改善, 发展了生产, 改善了环境, 增加了收益。     

南极格罗夫山陨石岩石学特征Ⅰ:非平衡L3型普通球粒陨石

我国第16次南极科学考察队在格罗夫山区域的蓝冰表面回收到28块陨石,其中有6块属于非平衡型(即3型)普通球粒陨石。它们保存了原始的岩石矿物学特征,包括非常清晰的球粒结构、基质未重结晶和不透明、橄榄石和低钙辉石颗粒具有明显的成分环带和极不均一的化学组成等。Fe-Ni合金含量、含Fe总量和橄榄石成分综合分析表明这6块陨石全部属于低铁群(L)。因为非平衡普通球粒陨石橄榄石成分变化的PMD(Fa)值与岩石类型亚型有良好的相关性,因此,根据橄榄石Fa的PMD标准这6块陨石被划分为如下亚型:GRV 99019为3.6型,GRV99020、GRV 99021和GRV 99026为3.5型,GRV 99001为3.4型,GRV 99022为3.0—3.4型。     

Siderophile Element Compositions of Pyroxenes in HED Meteorites: Implications for the Differentiation of Magma Ocean on Vesta

<正>1 Introduction The howardite,eucrite and diogenite(HED)meteorites are ultramafic and mafic igneous rocks and impact-engendered breccias derived from a thoroughly differentiated asteroid 4 Vesta.Diogenites include dunites,     

南极MIL 090070月球陨石的岩石矿物学特征

MIL 090070陨石是2009年美国南极陨石搜寻项目(ANSMET)在南极横断山脉米勒山区(Miller Range)发现的一块月球陨石,属于斜长岩质月表角砾岩。它具有典型的碎屑结构,主要由岩屑、晶屑、玻屑和细粒基质组成。岩屑以复合斜长岩质岩屑和斜长岩岩屑为主,其次为辉长岩质斜长岩岩屑、辉长岩岩屑、辉长苏长岩岩屑、辉长岩质橄长岩岩屑和橄榄辉长岩岩屑等。晶屑有普通辉石、易变辉石、斜长石、尖晶石、石英和钛铁矿等矿物。玻屑主要为斜长石质的玻屑,呈细长或弯曲条状,多具裂纹。MIL 090070陨石的矿物组成主要为斜长石（86 vol%,An92—99）、橄榄石（6 vol%,Fo53—89）、辉石（7 vol%,En25—83Fs7—43Wo2—45）,以及少量的尖晶石、钛铁矿和石英等;其中,辉石有单斜辉石和斜方辉石二种。MIL 090070陨石中橄榄石和辉石的Fe-Mn值分布明显不同于地球、火星、金星和小行星的样品,基本落在月球岩石范围。MIL 090070陨石在多期次冲击和胶结作用下,岩屑的矿物成分和粒度不断变化,岩屑类型更多样,更复杂。基于MIL 090070陨石的岩石矿物学特征、碎屑类型及结构的特征等研究,可以进一步丰富我们对月球物质的形成及月岩—月壤演化过程的认识。     

荷叶塘陨石岩矿特征及化学-岩石类型研究

荷叶塘陨石是1998年降落的一块普通球粒陨石。本文在对荷叶塘陨石的岩石学和矿物化学特征分析的基础上,划分了荷叶塘陨石的岩石类型和次级岩石类型。荷叶塘陨石橄榄石的Fa值在0.6-48.8之间,平均值为23.2,PMD为60.1%;低钙辉石的FS值在0.6-49.0之间,平均值为9.1,PMD为97.5%。结合橄榄石Fa值的PMD与次级岩石类型关系、橄榄石中的Cr含量、铁纹石中富Ni颗粒的数量密度等,综合判断荷叶塘陨石的化学-岩石类型为L3.3,由此表明该陨石是一块热变质程度非常低的L型非平衡普通球粒陨石。