乌拉特后旗测老庙拗陷西北缘一典型入湖三角洲剖面露头简介——测老庙拗陷地质研究和实习基地典型露头之二
An Introduction to a Natural Outcrop of an Early Cretaceous Lacustrine Delta in Celaomiao Depression, Urad Rear Banner, Inner Mongolia --One of the Typical Outcrops in Celaomiao Depression for Earth Science Research and Field Training
查看参考文献7篇
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文摘
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内蒙古西部狼山以北的测老庙拗陷中主要充填着下白垩统巴音戈壁组陆相碎屑岩。拗陷的西部边缘主要出露灰黑色页岩,偶见巨厚层砂砾岩为主构成的河流相三角洲入湖沉积体。一条近南北向延伸100多米、深达20余米的冲沟切割出一个非常完整的三角洲人湖砂体纵剖面,从下而上依次显示出由灰黑色页岩夹泥灰岩组成的底积层,由砂砾岩组成的前积层和相似组分的顶积层,而在顶积层之上还见上覆旋回的部分前积层下部层序。根据顶积层和前积层产状判断,露头点处古流向为SSW,说明物源区在北侧,而湖泊主体在南部。根据三角洲顶积层和前积层特征判断,该早白垩世人湖三角洲应为辫状河三角洲。完整的三角洲天然露头十分罕见,研究者往往借助于地震或雷达等手段间接地探讨三角洲的结构特征,而本露头为人们野外现场观察三角洲的结构层特征提供了最为直观的例子。 |
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其他语种文摘
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Celaomiao Depression, Urad Rear Banner(Wulate Houqi),situated in the east margin of Bayingebi Basins,western Inner Mongolia,was formed in the Early Cretaceous and filled with siliciclastic rocks, covering 850 km~2. There are some excellent outcrops showing unique geologic phenomena due to sparse vegetation and severe erosion. However, these important geological outcrops have not drawn the attention of geologists because they are in the remote area. We have introduced an outcrop of a volcanic conduit in a paper (Lu Hongbo et al, 2015&),and in this article,we will describe a natural outcrop of a typical lacustrine delta of Early Cretaceous in the west margin of Celaomiao Depression. Although different delta models have been introduced in many geological journals and magazines,few natural outcrop features from direct field investigation have been demonstrated in the literature yet. We are lucky to find one outcrop showing the intact longitudinal profile of a lacustrine delta, in the west margin of Celaomiao Depression. We are delighted to share this outcrop with other geologists because it is helpful to understand and reevaluate the different existing delta models. The three sedimentary units of the delta are clearly exposed on both sides of a dry gully in the NNE direction. The topset beds are composed of conglomerates and coarse sandstones with parallel bedding, and the foreset beds consist of similar sediments and form the typical concave upward beddings. The bottomset beds are mainly black shales and interbedded marlstones (Fig. 1). The attitude of foreset beds shows a SSW paleoflow,revealing the major part of the lake to the south and a provenance in the northern direction. The lacustrine delta belongs to a braid delta according to the architecture of the delta. This natural outcrop of lacustrine delta is not only a true scenario for geologists to research in three dimensions in the field,but also a very good site for the geological field training. |
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来源
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地质论评
,2016,62(1):229-234 【核心库】
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DOI
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10.16509/j.georeview.2016.01.018
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关键词
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入湖三角洲
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天然露头
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乌拉特后旗测老庙拗陷
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白垩纪
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地址
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1.
(青岛)中国石油大学地学院, 山东, 青岛, 266580
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中国地质科学院, 北京, 100037
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中国科学院南京地质古生物研究所, 南京, 210008
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0371-5736 |
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基金
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中陕核工业集团委托的研究项目
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文献收藏号
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CSCD:5610834
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参考文献 共
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1.
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地质论评,2015,61(6):1429-1433
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被引
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2.
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3.
Li Sha. Discovery of the Jehol Biota from the Celaomiao region and discussion of Lower Cretaceous of the Bayingebi Basin,Northwestern China.
Palaeoworld,2015
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