第四纪洞庭盆地沅江凹陷东缘鹿角地区构造一沉积演化研宄

柏道远; 周柯军; 马铁球; 王先辉; 彭云益; 李纲; 陈渡平

第四纪洞庭盆地沅江凹陷东缘鹿角地区构造一沉积演化研宄

湖南省地质调查院，湖南长沙 410011

基金项目:

中国地质调查局地质大调查项目“湖南1:25万常德市幅和岳阳市幅区域地质调查 1212010610706

详细信息

作者简介:
柏道远（1967-），男，研宄员级高级工程师，主要研宄方向为第四纪地质学、构造学；E-mail: daoyuanbai@sina. com

中图分类号: P534.63
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出版历程
- 收稿日期: 2009-08-18
- 刊出日期: 2009-12-28

STUDY ON QUATERNARY TECTONIC-SEDIMENTARY EVOLUTION OF LUJIAO AREA, EAST EDGE OF YUANJIANG SAG, DONGTING BASIN

Hunan Institute of Geology Survey, Changsha 410011, Hunan, China

摘要

摘要: 沅江凹陷为第四纪洞庭盆地东部的一个次级凹陷。通过地表地质调查和钻孔资料，在沅江凹陷东缘北部鹿角地区第四纪构造、沉积及地貌特征研究基础上，探讨并提出其构造一沉积演化过程：早更新世早期洪湖一湘阴断裂和荣家湾断裂相继活动，断裂以西地区断陷沉降并沉积，以东地区则构造抬升而遭受风化剥蚀。早更新世末期凹陷区东部构造反转抬升并遭受侵蚀。中更新世早期和中期凹陷区断陷沉降并接受沉积。中更新世晚期研究区整体抬升而遭受剥蚀。晚更新世西部主凹陷区在稳定或弱沉降并形成泥质沉积，东部间歇性抬升。在上述中更新世晚期开始的构造抬升的同时，研究区东部产生了自东向西、自南向北的构造掀斜。全新世构造总体稳定，西部洞庭湖区形成湖冲积。区域上，第四纪洞庭盆地构造性质经历了早期断陷到晚期坳陷的转变。
- 第四纪 /
- 沉降与抬升 /
- 沉积与地貌特征 /
- 沅江凹陷东缘
Abstract: Quaternary Yuanjiang sag is an eastern one of the secondary tectonic units of the Dongting basin. Detailed geologic mapping and bore data were taken to reveal the Quaternary tectonic, sedimentary and geomorphic characteristics and tectonic-sedimentary evolution of Lujiao area, northeast Yuanjiang sag. The Honghu-Xiangyin fault and Rongjiawan fault formed in succession during Early Pleistocene, which caused that the west walls of the faults subsided and received alluvial and lacustrine deposits, while the east walls rose and were denuded. Eastern area of the sag uplifted and was denuded in the end of Early Pleistocene. The sag subsided and received alluvial and lacustrine deposits during early-middle Middle Pleistocene. The study area rose as a whole and was denuded during late Middle Pleistocene. The western main depressional area was stable or subsided weakly and formed clay deposits in Late Pleistocene, when east area rose by fits. In the same time of above tectonic uplift since late Middle Pleistocene, east of the area tilted westward and northward. The area was under tectonic stable state in Holocene, forming alluvial-lacustrine deposits in western Dongting lake area.
- Quaternary /
- subsidence and uplift /
- sedimentary and geomorphic characteristics /
- east edge of Yuanjiang sag

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图 1 第四纪洞庭盆地构造格局

1.前第四纪地层出露区；2.第四纪地层出露区；3.第四纪正断裂，齿向示下降盘；4.构造单元分界线；5.构造单元代号。构造单元名称：U₁-武陵隆起；U₂-雪峰隆起；U₃-幕阜山隆起；₄-澧县凹陷；U₅-临澧凹陷；U₆-太阳山隆起；U₇-安乡凹陷；U₈-赤山隆起；U₉-沅江凹陷；U₁₀-华容隆起；U₁₁-江汉盆地。方框示图 2范围

Figure 1. Tectonic framework map of Quaternary Dongting Basin

下载: 全尺寸图片幻灯片

图 2 鹿角地区综合地质地貌图

1.前第四纪基岩；2.控盆控凹正断裂，齿向示下降盘；3.地质体界线；4.第四纪构造单元分界；5.第四纪沉积等厚线及厚度值；6.河流；7.湖泊水面；8.高程点与高程值/山峰与高程；9.山脊线；10.第四纪地质剖面位置，A-B对应图 3，C-D对应图 5。Qh^al-全新世冲积；Qh^lal-全新世湖冲积；Qp₃bs-晚更新世白水江组；Qp₂mw-中更新世马王堆组；Qp₂b-中更新世白沙井组；Qp₂d-中更新世洞庭湖组；Qp₁m-早更新世汨罗组；F₁-洪湖一湘阴断裂；F₂-荣家湾断裂

Figure 2. Geological-geomorphologic sketch map of Lujiao area

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图 3 阳罗一黄沙街第四纪地质剖面(剖面位置见图 2中A—B剖面线)

1.粘土；2.淤泥；3.网纹红土；4.砂层；5.含砾砂层；6.砂砾层；7.砾石层；8.基座；9.地层单位界线/相变界线；10.钻孔位置及编号。Qh^al全新世冲积；Qh^lal-全新世湖冲积；Qp₃bs-晚更新世白水江组；Qp₂mw-中更新世马王堆组；Qp₂b-中更新世白沙井组；Qp₂d-中更新世洞庭湖组；Qp₁m-早更新世汨罗组；F₁-洪湖一湘阴断裂；F₂-荣家湾断裂

Figure 3. Yangluo-Huangshajie Quaternary geological section (location is shown with A-B line in fig.2)

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图 4 荣家湾露头剖面

今层岩性详见正文说明，OSL-光释光测年

Figure 4. Rongjiawan outcrop section

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图 5 晏家山一黄秀林场第四纪地质综合剖面图(剖面位置见图 2中C—D剖面线)

Qh-全新世冲积层；Qp₃bs-晚更新世白水江组；Qp₂mw-中更新世马王堆组；QP₂d-中更新世洞庭湖组；QP₁m-早更新世汨罗组

Figure 5. Quaternary geological section at Yangjiashan-Huangxiu forestry station (location is shown with C—D line in fig.2)

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图 6 傅家垸第四纪地质露头剖面

岩性详见正文说明。Qh-全新世冲积层; Qp₂mv-马王堆组

Figure 6. Fujiayuan Quaternary geological outcrop section

下载: 全尺寸图片幻灯片

图 7 黄秀林场第四系露头剖面

Qp₂d-中更新世洞庭湖组；Qp₁m-早更新世汨罗组。岩性特征等详见正文

Figure 7. Huangxiu forestry station outcrop section

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表 1 洞庭盆地及周缘第四纪地层划分对比表

Table 1. Subdivision and correlation of the Quaternary strata in Dongting basin and its adjacent areas

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