Some Evidence for a Possible Extraterrestrial Event at／near Permian—Triassic Boundary

A selection of evidence, including a carbon isotopic excursion, iridium anomaly, fullerenes (C60 and C70) with trapped noble gasses, microspherules and shocked quartz, is discussed in this paper. All the evidence in hand favors the hypothesis that the PTB event was probably related to an extraterrestrial cause, and the impact would lead to great physical change, including large volcanic eruptions. on the earths surface. The ET markers for the CTB event could be considered only as an example, and cannot be taken as a unique standard of an ET event.     

四川峨眉麦地坪震旦系—寒武系界线剖面的中子活化分析研究

张勤文等曾对四川峨眉麦地坪震旦系－寒武系界线剖面进行了研究。１９９１年对此剖面又进行了加密间距采样。中子活化分析结果表明，在震旦系－寒武系界线附近的标本具有较高的Ｎｉ，Ｃｏ，Ｃｓ含量，Ｉｒ的含量也较上覆，下伏地层的标本为高。因而认为，在麦地坪剖面把中国Ｃ点作为震旦系与寒武系的分罪比采用中国Ａ点，Ｂ点及Ｄ点界线，依据更充足些。     

河南西峡晚白垩世恐龙蛋化石壳微量元素组成及其对恐龙灭绝的指示意义

恐龙蛋化石是探索恐龙生存和灭绝的重要研究材料,目前对恐龙蛋化石的研究集中在生物学和埋藏特征方面。本文利用电感耦合等离子体发射光谱法(ICP-OES)对采自河南西峡晚白垩世的12枚恐龙蛋化石壳及部分围岩进行分析测试,研究其生命微量元素组成及其与恐龙灭绝的关系。结果表明,恐龙蛋壳中缺乏碳氮磷硫等有机质元素,而主要由钙铝镁铁钾等生命必需元素和锶锰钡镧锌硼钒钴铱等微量元素组成,其中锶和铱均具有明显的超高异常,这可能与地外撞击事件引起生态环境的急剧变化有关。元素的组合规律表明西峡盆地晚白垩世应为干旱、半干旱的气候环境,来自于环境中异常含量的锶和铱共同作用使这一时期该地区大量的恐龙蛋在恐龙体内遭受污染,发育孵化机能受到影响,成为导致盆地内恐龙灭亡的主要原因之一。这一发现为探讨恐龙生活环境变化、灭绝原因以及揭示晚白垩纪古气候提供了重要依据。     

基于Linux的气象水文浮标采集系统设计及实现

为了获取海洋连续稳定的气象和水文数据,作者设计了基于Linux的气象水文浮标采集系统,多线程同时测量海面的气象参数（温度、湿度、气压和风速、风向）和海下的水文参数（不同深度的水温和盐度）,监控浮标的电压、漏水和开舱状态,测量和监控原始数据自动备份到系统的数据库,通过CDMA/GPRS或卫星与岸站接收系统通信,实现采集数据实时回传、自动备份和数据补发功能。目前已经在近海和远海各布放2套,气象数据和水文数据采集与接收正常。实验结果表明,该方案解决了近海和远海的海洋气象数据和水文数据的同时采集与传输,具有高度的可扩展性,获取的海洋气象和水文数据连续稳定可靠。     

Trace Element Data for Gold, Iridium and Silver in Seventy Geochemical Reference Materials

New concentrations for Au, Ir and Ag obtained by instrumental neutron activation analysis are presented for seventy geochemical reference materials. Results in agreement with literature values for Au and Ir down to concentrations of a few ng g⁻¹ were obtained. For Au and Ir concentrations above 10 ng g⁻¹, the repeatability of replicate analyses of reference materials was mostly better than 10%. For concentrations between 1 and 10 ng g⁻¹ the RSD for Ir was 10–30%, whereas for Au it was higher and more variable (20–50%). In addition, concentrations for Cd and Hg are presented for some of the same reference materials. The high RSD at relatively high concentrations seen in gold for some RMs (e.g., WMG-1, WMS-1) did not exist for Ir and suggests homogeneity for this platinum-group element at the sub-sample size used in this study. For the following eight RMs, mostly ultramafic rocks (CHR-Pt+, OREAS-13P, OREAS-14P, PCC-1, UMT-1, WMG-1, WMS-1, WPR-1), Ir measurements agreed within ± 10% of mostly certified or recommended concentrations, which ranged from 2 ng g⁻¹ to 6 μg g⁻¹. For the reference material UB-N, iridium concentration compared favourably to published results obtained by isotope dilution ICP-MS methods and a previously unrecognised heterogeneity is inferred for Au, Hg and Sb, but not for the other measured elements.     

新近系-第四系界面撞击事件研究的新进展

通过对中国黄土高原南缘的段家坡黄土-红粘土剖面Ga/M边界(2.48MaBP)上下地层中5种微颗粒和土样微量元素的研究,进一步确定了下更新统午城组黄土底部记录着两次撞击事件的信息。较早的一次记录于L38中,年代为2.53-2.48MaBP,以多种撞击成因或与之有关的微颗粒为标志,且有丰度为58.3×10-12g/g的Ir异常和14.3×10-9g/g的Au异常给与确证。这是一次真正的N/Q界面撞击事件,在气候地层上与从上新统红粘土向更新统黄土的过渡相一致,在磁性地层上与从高斯正极性向松山反极性的转变相联系。较晚的一次记录于S37中,年代为2.43-2.42MaBP,在多种微颗粒标志中,还包括含有Ir异常分别为3.89×10-6g/g的宇宙尘和2.15×10-8g/g的生物球粒。文中用综合成因模式解释了不同特性的撞击记录共存的现象,并指出中国黄土在天文地质研究方面尚蕴藏着大量信息。      

山东淄博-章丘盆地三叠系时代讨论

山东基岩区三叠系一直缺少生物化石依据。前人在该套地层底部发现了铱等元素异常，认为可作为划分其地质时代的依据。笔者在1：25万淄博市幅区域地质调查中，于该地层中首次发现了孢粉化石，结合前人铱等异常特征，经区域对比确定其形成于早-中三叠世，并认为区内孙家沟组相当于华北地区的和尚沟组，刘家沟组则相当于二马营组。