共查询到19条相似文献，搜索用时 203 毫秒
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在吉林省南部元古宇石英岩内发现磁性微球粒３９２枚,根据其产状,形貌及一般特征,微结构和化学组成表明为陨石消融型宇宙尘,由４亚４小类组成一个宇宙尘系列,（１）金属球粒;（２）纯铁球粒,（ｂ）ＦＣＮ型（天然不锈钢）球粒;（２）氧化物球粒（ａ）普通铁质宇宙尘（ｂ）铬铁氧化物球粒;（３）玻璃质球粒;（４）氧化物－金属过渡型球粒,其母体要能是一分异的ＦＣＮ型石－铁陨石质陨星体,核部为ＦＣＮ合金,经消融分异作 相似文献
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吉林省“七五”期间基础地质研究简介张普林，张轶男（吉林省区调所）（长春地质学院）吉林省基础地质工作在“七五”期间，通过省内外有关生产、教学和科研地质工作者的共同努力，取得可喜的进展。前寒武系研究，以地质事件为主线，辩认出深成侵入体，划分出地质事件期次... 相似文献
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相关水漏检测仪及其应用赵光义汪兴华凌振宝（长春地质学院，长春１３００２６）相关水漏检测仪是吉林省科委下达的研究项目。该项目采用先进的科技手段，能及时、准确地实现对地下自来水管道漏水部位的检测。１地下管道漏水的特性管道漏水是一种承压状态下的水射现象，从... 相似文献
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辽宁营口后仙峪硼矿床特征及成因 总被引：9，自引：0，他引：9
辽宁营口后仙峪硼矿床特征及成因冯本智，邹日（长春地质学院，长春，１３００６１）（中国科学院广州地质新技术研究所，广州，５１０６４０）１成矿地质构造背景中国古元古代硼矿带分布于辽东克拉通古裂谷带轴部（陈荣度，１９８１），由西到东集中于四个含硼盆地。在古... 相似文献
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塔里木盆地白垩纪灰褐色含油砂岩中发现的宇宙尘为硅质宇宙尘，该宇宙尘粘附于伊／蒙混层粘土矿物表面，近于理想球体，直径为６ｕｍ，具镶嵌结构。这一发现在我国白垩系尚属首次。在化学成份上该宇宙尘与已报导的宇宙尘相似，对已发现的宇宙尘氧化物成份的研究表明，地球物质中ＴｉＯ２／ＳｉＯ２，ＴｉＯ２／ＦｅＯ，ＦｅＯ／ＳｉＯ２分别为０．０１，０．１７，０．１。 相似文献
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吉林省中,新生代黑色页岩（油页岩）中某些金属元素富集特征 总被引：3，自引：0，他引：3
吉林省中，新生代黑色页岩（油页岩）中Ａｇ，Ｕ，Ｃｏ，Ｎｉ等元素含量偏高，黑色页岩（油页岩）中古生物组合丰富，有机碳含量很高（＞２％）。研究了吉林省中、新生代黑色页岩（油页岩）中稀、贵金属元素富集特征，初步探讨了其富集机理，为吉林省中，新生代含金属的黑色页岩（油页岩）的综合利用提供参考。 相似文献
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吉林省地质矿产局于1992年4月20日在长春聘请长春地质学院和吉林省地矿局的有关专家,对长春地质学院和吉林省地矿局第六地质调查所共同完成的《吉林省汪清县闹枝、刺猬沟金矿床》科研报告进行了技术鉴定。该研究课题以金矿床的最新成矿理论为指导,运用构造地质学、矿物学、岩石学、地球化学、遥感地质和地球物理等多学科联合攻关,以大量的实际材料和数据,对闹枝和刺猬沟金矿床的矿床特征和成矿条 相似文献
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陈明 《矿物岩石地球化学通报》1995,(4)
微量元素组合特征对玉米产量的影响陈明（长春地质学院，长春１３００２６）关键词微量元素，玉米产量，定量模型，特征分析，松嫩平原ｌｉｅ量元素组合与玉米产量的关系微量元素对某些农作物产量的影响不仅在于其绝对含量上，而且体现在元素的组合特征上，有时组合特征更... 相似文献
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Cécile Engrand Kevin D. McKeegan Gregory F. Herzog Laurence E. Nyquist 《Geochimica et cosmochimica acta》2005,69(22):5365-5385
Large, correlated, mass-dependent enrichments in the heavier isotopes of O, Cr, Fe, and Ni are observed in type-I (metal/metal oxide) cosmic spherules collected from the deep sea. Limited intraparticle variability of oxygen isotope abundances, typically <5‰ in δ18O, indicates good mixing of the melts and supports the application of the Rayleigh equation for the calculation of fractional evaporative losses during atmospheric entry. Fractional losses for oxygen evaporation from wüstite, assuming a starting isotopic composition equal to that of air (δ18O = 23.5‰; δ17O = 11.8‰), are in the range 55%-77%, and are systematically smaller than evaporative losses calculated for Fe (69%-85%), Cr (81%-95%), and especially Ni (45%-99%). However, as δ18O values increase, fractional losses for oxygen approach those of Fe, Cr, and Ni indicating a shift in the evaporating species from metallic to oxidized forms as the spherules are progressively oxidized during entry heating. The observed unequal fractional losses of O and Fe can be reconciled by allowing for a kinetic isotope mass-dependent fractionation of atmospheric oxygen during the oxidation process and/or that some metallic Fe may have undergone Rayleigh evaporation before oxidation began.In situ measurements of oxygen isotopic abundances were also performed in 14 type-S (silicate) cosmic spherules, 13 from the Antarctic ice and one from the deep sea. Additional bulk Fe and Cr isotopic abundances were determined for two type-S deep-sea spherules. The isotopic fractionation of Cr isotopes suggest appreciable evaporative loss of Cr, perhaps as a sulfide. The oxygen isotopic compositions for the type-S spherules range from δ18O = −2‰ to + 27‰. The intraspherule isotopic variations are typically small, ∼5% relative, except for the less-heated porphyritic spherules which have preserved large isotopic heterogeneities in at least one case. A plot of δ17O vs. δ18O values for these spherules defines a broad parallelogram bounded at higher values of δ17O by the terrestrial fractionation line, and at lower values of δ17O by a line parallel to it and anchored near the isotopic composition of δ18O = −2.5‰ and δ17O = −5‰. Lack of independent evidence for substantial evaporative losses suggests that much of this variation reflects the starting isotopic composition of the precursor materials, which likely resembled CO, CM, or CI chondrites. However, the enrichments in heavy isotopes indicate that some mixing with atmospheric oxygen was probably involved during atmospheric entry for some of the spherules. Isotopic fractionation due to evaporation of incoming grain is not required to explain most of the oxygen isotopic data for type-S spherules. However spherules with barred olivine textures that are thought to have experienced a more intense heating than the porphyritic ones might have undergone some distillation. Two cosmic spherules, one classified as a radial pyroxene type and the other showing a glassy texture, show unfractionated oxygen isotopic abundances. They are probably chondrule fragments that survived atmospheric entry unmelted.Possible reasons type-I spherules show larger degrees of isotopic fractionation than type-S spherules include: a) the short duration of the heating pulse associated with the high volatile content of the type-S spherule precursors compared to type-I spherules; b) higher evaporation temperatures for at least a refractory portion of the silicates compared to that of iron metal or oxide; c) lower duration of heating of type-S spherules compared to type-I spherules as a consequence of their lower densities. 相似文献
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北京十三陵中元古代常州沟组底部的粗砂岩（1.8 Ga）和大红峪组硅化碳酸盐岩（1.6 Ga）中都发现了众多铁质宇宙球粒。大多数未喷膜的二次电子像宇宙球粒是圆形的,少数呈长条状,由于在大气层中熔融作用,多数球粒表面具有金相饰纹和“排气”孔洞。使用电子探针分析对30个颗粒中44个测点的检测结果（%）:FeO 80～95,Cr2 O30.78～6.56,NiO 0.06～0.41,CoO 0.02～0.46。相对比较Cr2O3 在常州沟组中较多一些,而FeO在大红峪组中稍多一些。宇宙球粒的氦同位素分析值却截然不同;3He/4He×10-8分别为:57.50±2.16（常州沟组）和1.23±0.43（大红峪组）;4He×10-8 cm3STP/g分别为:55.54（常州沟组）和809.6（大红峪组）;然而宇宙球粒的氦同位测定值都比各自的母岩高出许多;氦同位素的异常为所发现的宇宙球粒的地外来源更加确定。 相似文献
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The paper reports scanning electron microscopy (FEG-SEM) and transmission electron microscopy (TEM) data on three cryptocrystalline (CC) cosmic spherules of chondritic composition (Mg/Si ≈ 1) from two collections taken up at glaciers at the Novaya Zemlya and in the area of the Tunguska event. The spherules show “brickwork” microtextures formed by minute parallel olivine crystals set in glass of pyroxene–plagioclase composition. The bulk-rock silicate chemistry, microtexture, mineralogy, and the chemical composition of the olivine and the local chemistry of the glass in these spherules testify to a chondritic source of the spherules. The solidification of the spherules in the Earth’s atmosphere was proved to be a highly unequilibrated process. A metastable state of the material follows, for example, from the occurrence of numerous nanometer-sized SiO2 globules in the interstitial glass. These globules were formed by liquid immiscibility in the pyroxene–SiO2 system. Troilite FeS and schreibersite (Fe,Ni)3P globules were found in the FeNi metal in one of the spherules, which suggests that the precursor was not chemically modified when melted in the Earth’s atmosphere. Our results allowed us to estimate the mineralogy of the precursor material and correlate the CC spherules with the chondrule material of chondrites. The bulk compositions of the spherules are closely similar to those of type-IIA chondrules. 相似文献
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Guang-Hai Shi Xiang-Kun Zhu Qian Mao Guo-Wu Li 《Geochimica et cosmochimica acta》2011,75(6):1608-1620
Here we report spherules in Myanmar jadeitite, a rock forming from jadeitic fluids within mantle-derived serpentinized rocks in subduction zones under high-pressure conditions (>1.0 GPa) and rather low temperatures of about 250-370 °C. The spherules have off-centre iron nuclei and dendritic wüstite cortexes, with tiny wüstite crystals perpendicular to the surface of iron core. Within the spherules are vesicles occupied by calcite, jadeite, albite? or mixtures of these phases, and the cortexes contain about 10 wt.% SiO2 + Al2O3 + Na2O filling materials within wüstite. The spherules are in direct contact with jadeite crystals. Contrasting patterns of some individual spherules are obvious between a front area with a crowd of hill-like prominences and a rear zone with one or more rings on the surface. Such surface features and internal textures suggest that they experienced movement at high temperature and then rapid cooling. Chemical compositions of the nuclei are homogenous and consist of nearly pure iron with minor Cr (<0.05 wt.%), Mn (<0.80 wt.%), and Ni (0.142-0.23 wt.%), and a trend of Ni decreasing and Cr increasing from core to cortex. Mn in the cortex (up to about 2.00 wt.%) is far more enriched than the nucleus. The bulk ratios (average) of δ56Fe and δ57Fe in the core and cortex are 0.51and 0.78, respectively. Such features suggest that there is a very low possibility of origin associated with volcanic explosive eruption, impact ejecta, chemical reduction or oxidation of iron on seafloor. Since biological reduction processes are not significant under high P/T condition in subduction zones, this origin is excluded. Considering their low Ni contents, it is more likely that they belong to the minor type-I deep-sea cosmic spherules/dusts of low isotope fractionation. This discovery shows that such spherules could remain stable under low-temperature and high-pressure conditions during recycling processes, and therefore could be found in rocks related to slab-derived sediments within subduction zones. This also suggests that subducted oceanic slab sediments contribute to the formation of jadeitite, coupled with dehydration of sediments and altered oceanic crust. 相似文献
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金石滩是大连地区的国家级风景旅游地,在玫瑰园景点的现代沉积物研究中,首次发现了铁质宇宙球粒,而且含量较多,在2.4 kg(<0.5 mm)的砂样中分离出18个宇宙球粒,其大小介于158～423μm,大多数宇宙球粒的表面具有典型的融熔-分凝构造,按其表面化学成分可分为:Fe质、Si-Al-Fe质、Cr-Fe质和Ti-Fe质等4种;笔者特别对其中的Ti-Fe质宇宙颗粒的成分及矿物演变进行了研究,认为宇宙球粒快速冷凝化学分异可在磁铁矿边缘形成钛磁铁矿;对大连、西藏泽当现代沉积物中、太平洋深海现代沉积物中,以及北京十三陵元古宙沉积岩中的宇宙球粒进行了比较,结果表明它们在化学成分上虽有差别,但在颗粒大小和表面结构上是类似的。 相似文献
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宇宙尖晶石与地球尖晶石的比较 总被引：1，自引：0，他引：1
本文就宇宙尖晶石的形态，化学组成，及产状特征作了概要性论述，对它的成因机制 作了介绍；并和地球尖晶石作比较，表明它们之 间的成因和形成条件的差异，突出了宇宙尖晶石的特点，即宇宙尖晶石为陨石物质在大气氧化过程中结晶而成，无例外的都有一个较高的氧化态和高镍含量。在地质纪录中宇宙尖晶石的发现具有双重意义，它既是地外物质的标志，又反映了增生事件独特的形成环境。 相似文献
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SONG Tianrui ZHENG Ning LIU Yongqing KUANG Hongwei PENG Nan LI Chao TANG Jigang YAN Qinggao GAO Linzhi ZHU Zhicai XIA Xiaoxu WANG Yuchong 《《地质学报》英文版》2020,94(1):38-56
This study covers cosmic spherules derived from the Mesoproterozoic Dahongyu Formation in the Ming Tombs area, Beijing. The cosmic spherules include iron oxide cosmic spherules, carbonaceous chondrites, and atomic iron “steely bead”-shaped cosmic spherules. The mineral assemblage of silicon carbide, forsterite, zircon, and glass spherules and fragments were picked from melt-silicified carbonate of the Mesoproterozoic Dahongyu Formation (ca. 1625 Ma). Cosmic spherule assemblages are solely discovered from sedimentary rocks in China. Platinum group elements (PGE) were determined for the first time in cosmic spherules and associated minerals. PGE comparative observation between meteorite and cosmic spherules is presented in this study. It is recognized that an extraterrestrial meteorite impact event might have occurred in the Dahongyu Stage. The main evidence is a large number of iron cosmic spherules in silicified oncolitic limestone, and associated cosmic silicon carbide, glass spherules, and fragments, as well as the presence of forsterite. The impact-volcanic crater is characteristic of a big black shale block dropped into the bended silicified limestone. 相似文献