安徽齐云山晚白垩世恐龙蛋矿物和元素组成及古环境分析

发布时间：2018-03-18 02:26

本文选题：恐龙蛋　切入点：矿物组成　出处：《岩矿测试》2017年04期 　论文类型：期刊论文

【摘要】：安徽齐云山新发现的恐龙蛋化石保存完好,是研究该地区晚白垩世恐龙动物群生活环境及绝灭的关键。本文采用粉晶X射线衍射法(XRD)、电感耦合等离子体发射光谱/质谱法(ICP-OES/MS)分析齐云山恐龙蛋壳、蛋核及围岩的宏观矿物及主量、微量元素组成,以探讨齐云山晚白垩世古环境和古气候特征。结果表明:恐龙蛋壳主要矿物组成为方解石和石英,且蛋内外物质矿物组成相似,主要为石英和长石;而元素组成包括常量元素Ca、Na、Mg、K、Al和Fe及微量元素Sr、Zn、Ba、As、Ti、V、Cr、Co、Ni、Cu、Mn、Pb、La、U和Ir,其中Sr在蛋壳中含量的平均值为6199.3×10~(-6),高于河南西峡及广东南雄大部分恐龙蛋壳中的Sr含量,蛋壳中Ir含量的平均值为59.6×10~(-12),Sr和Ir与背景值相比均有明显异常,分析认为是恐龙与外界进行物质交换时吸收有害元素引起的。而As、Mn和Pb的富集及Zn的不足可能使恐龙机体中毒进而灭绝。围岩中Fe含量的增加表明齐云山地区晚白垩世为干旱炎热的气候条件,与Fe呈正相关性的Ir元素随Fe含量的增加而富集,且越靠近K/T界线,围岩中Sr和Ir元素含量越高,这是导致该地区恐龙动物群绝灭的原因之一。此结论为研究齐云山地区恐龙动物群的生活环境提供了依据。
[Abstract]:The newly discovered fossils of dinosaur eggs in Qiyun Mountain, Anhui Province, have been preserved in good condition. It is the key to study the living environment and extinction of the late Cretaceous dinosaur fauna in this area. In this paper, the shell of Qiyunshan dinosaur was analyzed by powder X-ray diffraction and inductively coupled plasma emission spectrometry / mass spectrometry (ICP-OES / MS). In order to study the paleoclimate and paleoclimate characteristics of late Cretaceous in Qiyunshan, the macrominerals and their main quantities and trace elements of egg core and surrounding rock are discussed. The results show that the main mineral composition of dinosaur eggshell is calcite and quartz, and the mineral composition of material inside and outside eggs is similar. The main elements are quartz and feldspar, and the composition of the elements include the constant elements CaGN, mg, K, Al and Fe, and the trace elements SrnZnZn-BaAs-titiang, Cr-CoCo-Ni-Cub-Mn-Pb, La-U and Ir.The average content of Sr in eggshell is 6199.3 脳 10-6, which is higher than that in the shell of most dinosaurs in Xixia, Henan Province and Nanxiong, Guangdong Province, and the content of Sr in the eggshells of most dinosaurs in Xixia, Henan Province and Nanxiong, Guangdong Province, is higher than that in the shell of most dinosaurs. The average value of ir content in eggshell is 59.6 脳 10 ~ (-1) ~ (-12), Sr and ir are obviously abnormal compared with the background value. It is believed that the absorption of harmful elements by dinosaurs when exchanging materials with the outside world. The enrichment of mn and Pb and the deficiency of Zn may lead to the poisoning and extinction of dinosaur body. The increase of Fe content in surrounding rock indicates that Qiyunshan area is late. The Cretaceous was an arid and hot climate. Ir elements with positive correlation with Fe are enriched with the increase of Fe content, and the closer they are to the K / T boundary, the higher the Sr and ir contents in the surrounding rock are. This is one of the reasons leading to the extinction of the Dinosaur fauna in this area, which provides a basis for the study of the living environment of the Dinosaur fauna in Qiyun Mountain.
【作者单位】：安徽大学资源与环境工程学院;安徽齐云山风景区管理委员会;
【基金】：安徽省自然科学基金资助项目(1708085QD86) 安徽大学博士科研启动经费项目(J10113190092)
【分类号】：Q915

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