干旱区生态环境知识资源中心(Arid): 湖南衡阳盆地东缘白垩系风成沉积的发现及其古环境意义

Arid

	湖南衡阳盆地东缘白垩系风成沉积的发现及其古环境意义
其他题名	The Discovery of Cretaceous Eolian Deposits at the Eastern Margin of the Hengyang Basin, Hunan, and Its Paleoenvironmental Significance
	黄乐清 1; 黄建中 2; 罗来 1; 王先辉 1; 刘耀荣 1; 梁恩云 1; 马慧英 1
来源期刊	沉积学报
ISSN	1000-0550
出版年	2019
卷号	37 期号:4 页码:735-748
中文摘要	首次报道了湘中南衡阳盆地东缘上白垩统红花套组中的风成沉积,重新认识了该地区晚白垩世时期的古地理环境。研究区红花套组主要出露一套紫红色块状中细粒长石石英砂岩、岩屑石英砂岩,普遍见指示风成沙漠环境的巨型板状、楔状交错层理、双向交错层理、平行层理以及典型的风棱石;镜下不含泥质、云母等悬移组分,电镜下可见碟形坑、新月形撞击坑、上翻(平坦)节理片等,综合分析后确认该套砂岩为风成沉积。该套风成砂岩具有重要的古环境意义:风成砂岩的发现,指示该时期为干热气候,沙漠化、盐湖化明显,食物的短缺可能导致衡阳盆地一带恐龙的迁徙;依据沙丘前积纹层倾向特征,恢复了湘中南乃至湖南地区的地表风带特征,为佐证衡阳盆地与其周缘红盆相连通提供一种新的依据。该发现为湖南省的风成沉积领域提供了宝贵的研究材料。
英文摘要	This is the first report of Upper Cretaceous eolian deposits in the Honghuatao Formation at the eastern margin of the Hengyang Basin in central southern Hunan,providing a new understanding of the paleogeographic environment of this area in the Upper Cretaceous. The Honghuatao Formation comprises a set of medium to fine-grained magenta feldspar quartz sandstone and lithic quartz sandstone. Large plates,wedge-shaped staggered bedding,bi-directional staggered bedding,parallel bedding and ventifacts are common,all indicating an eolian desert environment. Optical microscope examination shows that suspended components such as mud and mica are absent,and dishshaped pits,crescent-shaped craters,and upturned(flat)jointed particles are visible under the electron microscope. Comprehensive analysis confirmed that the sandstone is an eolian deposit,which has important paleoenvironmental significance. The discovery indicates that the climate was dry and hot;desertification and saline lakes were obvious, and food shortage might have led to the migration of dinosaurs in the Hengyang Basin. The dip characteristics of the foreset laminae of sand dunes has enabled the characteristics of surface wind belts in Hunan province to be restored, which provides a new basis for supporting the connection between the Hengyang Basin and its surrounding red basins. The discovery provides valuable material for the study of eolian deposition in Hunan province.
中文关键词	风成沉积 ; 古气候 ; 白垩纪 ; 红花套组 ; 衡阳盆地
英文关键词	eolian deposit paleoclimate Cretaceous Honghuatao Formation Hengyang Basin
语种	中文
收录类别	CSCD
WOS类目	GEOLOGY
WOS研究方向	Geology
CSCD记录号	CSCD:6561660
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/316259
作者单位	1.湖南省地质调查院, 长沙, 湖南 410116, 中国; 2.湖南省地质矿产勘查开发局, 长沙, 湖南 410011, 中国
推荐引用方式 GB/T 7714	黄乐清,黄建中,罗来,等. 湖南衡阳盆地东缘白垩系风成沉积的发现及其古环境意义[J],2019,37(4):735-748.
APA	黄乐清.,黄建中.,罗来.,王先辉.,刘耀荣.,...&马慧英.(2019).湖南衡阳盆地东缘白垩系风成沉积的发现及其古环境意义.沉积学报,37(4),735-748.
MLA	黄乐清,et al."湖南衡阳盆地东缘白垩系风成沉积的发现及其古环境意义".沉积学报 37.4(2019):735-748.