南阳盆地西峡赵营村上白垩统高沟组恐龙蛋化石埋藏特征及古环境意义
投稿时间:2019-07-30  修订日期:2019-09-26  点此下载全文
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作者单位E-mail
贾松海 河南省地质博物馆 cjzhang@lzu.edu.cn 
徐莉 河南省地质博物馆  
常华丽 河南省地质博物馆  
高永利 河南省地质博物馆  
张成君 兰州大学地质科学与矿产资源学院 cjzhang@lzu.edu.cn 
基金项目:“淅川盆地恐龙蛋多样性及古生态研究,2018年度探矿权采矿权使用费和价款地质科研项目(豫政采(2)20180300-4)”项目的资助
中文摘要:中文 豫西南阳盆地西峡赵营村上白垩统高沟组含有较多的恐龙蛋化石,其中最为著名的是“路易贝贝”胚胎化石。通过对含化石地层中恐龙蛋的保存特征和古气候重建,进一步认识白垩纪恐龙灭绝的古环境背景和原因。本文实测赵营村剖面厚约267.8m,主要由下伏泥盆系南湾组(厚7.9m)、上白垩统高沟组(厚259.9m,未到顶)组成。通过地层沉积物结构构造观测和样品采集,在室内进行了元素、碳酸盐碳氧同位素组成、有机质饱和烃生标化合物等测试。结果表明,高沟组沉积物主要源于熊耳山岩浆岩的风化和短距离迁移,恐龙蛋化石主要保存于海拔200-800m的山麓至平原过渡带的河漫滩,原地埋藏为主。降雨量的变化造成河漫滩与河道频繁变化,导致恐龙来回迁栖。生物标志化合物分析表明,含恐龙蛋化石地层有机质主要来源于水生植物、菌藻类和陆生植物,但植被总体不发育。利用地层沉积岩Si/Al、CIA、Rb/Sr比值,以及δ13C、δ18O等环境指标对高沟组气候重建,该时期古气候发生了较为快速的旋回变化,经历了暖干—暖湿—干旱—暖湿—干旱的古气候演变过程,总体上呈逐渐干旱化的趋势。通过赵营村晚白垩世早期恐龙蛋化石的埋藏、以及地层的古环境重建,说明古气候、古环境状况可能是影响恐龙生存的主要因素,大量恐龙蛋不能完全孵化、以及气候的干旱化导致植被恶化可能是恐龙逐渐消亡的原因。
中文关键词:南阳盆地  上白垩统  恐龙蛋化石  古环境
 
The dinosaur egg embedding Characteristics and Palaeoenvironmental Significance for the Gaogou Formation during the upper Cretaceous in the Xixia Zhaoyuncun of Nanyang Basin
Abstract:Numbers of dinosaur egg fossils, espically famous “Baby Louie” dinosaur egg embryo fossil, kept in the Gaogou Formation in the Upper Cretaceous Series in the Xixia of Nanyang Basin, Henan province. After researching the section embedding egg fossils in this paper, palaeoclimate and palaeoenvironment had been constructed and the paleoenvironmental background and reason about dinosaur extinction in the Cretaceous had understood in further. A 267.8m section had been determined in the Zhaoying village made up of Upper Cretaceous Gaogou Formation over Devonian Nanwan Formation. After bulk sediment elements, carbon and oxygen isotopes analyzed, sediments in the Gaogou Formation mainly came from the magmatic rocks from the Xionger Mountain. Dinosaur egg fossils embedding in situ kept in the flood plain belt of the foot of mountain to the far plain range of 200 to 800m asl. Runoff in the river and surface came from rain. River and flood plain sediment environments changed quickly with the precipitation changing so that dinosaurs came and went between foot of mountain and flood plain. Under the warm and wet condition, higher runoff formed the flood plain sediment environment with muddy silt rocks, which was a fitting for the dinosaur living and egging and hatching. When the precipitation rising, flood plain environment changed to the river environment to make dinosaur migration. From the saved completely dinosaur egg fossil and the proxies significance, river hydrodynamic was not very strong and ascended slowly. Organic matter in the strata including dinosaur egg fossils came from germ, alga, and aquatic and terrestrial plants, but was poor vegetation by biomarker analysis. Based on the geochemical proxies Si/Al, CIA, Rb/Sr, and carbon and oxygen isotopes of carbonates, paleoclimate during the Gaogou Formation changed quickly as warm/dry-warm/wet-dry-warm/wet-dry process, and had a dry tendency. Under the dry condition, precipitation and effective humidity decreased, runoff decreased also with vegetation cover rare so that huge animals could not find enough food for living. Based on the researched to the dinosaur egg embedding and paleoclimatical reconstruction during the late Cretaceous in the Zhaoying village of Xixia county, Henan province, the main factors to make dinosaur extinct gradually were the palaeoclimatical and paleoenvironmental deteriorate to make numbers of dinosaur eggs hatched incompletely and vegetable decreased largely.
keywords:Nanyang Basin  Upper Cretaceous  dinosaur egg fossil  paleoenvironment
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