河套盆地第四纪晚期不整合面的时代厘定及其构造意义讨论

doi:10.3969/j.issn.0253-4967.2020.04.003

地震地质 ›› 2020, Vol. 42 ›› Issue (4): 806-824.DOI: 10.3969/j.issn.0253-4967.2020.04.003

河套盆地第四纪晚期不整合面的时代厘定及其构造意义讨论

白鸾羲¹⁾, 徐锡伟^2),*, 罗浩³⁾, 李康²⁾, 李梦妮¹⁾, 魏雷鸣¹⁾, 王启欣²⁾, 赵俊香^2,4)

1)中国地震局地质研究所, 地震动力学国家重点研究室, 北京 100029;
2)应急管理部国家自然灾害防治研究院, 北京 100085;
3)中国地震灾害防御中心, 北京 100029;
4)中国地震局地壳动力学重点实验室, 北京 100085

收稿日期:2019-12-20 出版日期:2020-08-20 发布日期:2020-11-19
通讯作者: * 徐锡伟, 男, 研究员, E-mail: xiweixu@ies.ac.cn。
作者简介:白鸾羲, 女, 1991年生, 2017年于中国地震局地质研究所获构造地质学硕士学位, 主要从事活动构造等方面的研究, 电话: 13718261956, E-mail: blx0101@126.com。
基金资助:
中国地震行业科研专项(201508010)、国家自然科学基金(91214201)和国家重点研发计划项目(2018YFC1504105)共同资助

DISCUSSION ON THE TIMING AND ITS TECTONIC SIGNIFICANCE OF ANGULAR UNCONFORMITY IN HETAO BASIN IN THE LATE QUATERNARY SEDIMENTS

BAI Luan-xi¹⁾, XU Xi-wei²⁾, LUO Hao³⁾, LI Kang²⁾, LI Meng-ni¹⁾, WEI Lei-ming¹⁾, WANG Qi-xin²⁾, ZHAO Jun-xiang^2,4)

1)State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;
2)National Institute of Natural Hazards, MEMC, Beijing 100085, China;
3)China Earthquake Disaster Prevention Center, China Earthquake Administration, Beijing 100029, China;
4)Key Laboratory of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China

Received:2019-12-20 Online:2020-08-20 Published:2020-11-19

摘要/Abstract

摘要： 由于受到青藏高原隆升和东部多板块持续俯冲作用的影响, 鄂尔多斯块体周缘在新生代不同时期发生了不同强度的断陷活动。河套盆地是鄂尔多斯块体北缘与阴山山脉之间的新生代断陷盆地, 其内广泛分布着第四纪中晚期的湖相地层沉积。壕赖沟剖面、边墙壕剖面和狼山剖面位于河套盆地内, 通过分析其上更新统地层剖面的岩性和结构可知, 在厚约10m的湖相地层沉积中记录了1~2期角度不整合面。研究壕赖沟剖面、边墙壕剖面和狼山剖面的测年结果可知, 80ka以来形成了不整合面。

关键词: 壕赖沟剖面, 边墙壕剖面, 边墙壕剖面, 狼山剖面, 第四纪中晚期, 河套盆地

Abstract: The interaction between the continental-continental collision of the Indian-Eurasian plate and the westward underthrusting of Pacific plate is generally considered to be the cause of the destruction of North China Craton. At present, there are still doubts in the researches worldwide about the dynamic mechanism of the formation and evolution of the Ordos peripheral fault-depression system and the contemporary tectonic stress field.
The Hetao Basin is a Cenozoic fault basin located between the Ordos block and the Yinshan Mountains. Due to the effect of uplift of the Tibet Plateau and the continuous subduction of the Pacific plate, graben faulting of different intensities occurred in different periods of Cenozoic around the Ordos block. Late Quaternary lacustrine facies sedimentary strata are widely developed in Hetao Basin. The Haolaigou profile, Bianqianhao profile and the Langshan profile in this study are all located in Hetao Basin. According to the lithology and structural analysis of the upper Pleistocene series in the three profiles, angular unconformities of phase 1-2 are recorded in the lacustrine facies sediments with a thickness of about 10m. The dating results of the Haolaigou profile, Bianqianhao profile and Langshan profile show that the formation time of both unconformities is 80ka BP.
Using the tectonic geology, Quaternary geology, stratigraphy, sedimentology and a variety of dating methods, we also carry out a comprehensive study and obtain the following results:
(1)The analysis of lithological and structural features of Haolaigou profile, Bianqianghao profile and Langshan profile in the Hetao Basin shows that multi-phase angular unconformities events are recorded in the lacustrine strata of a thickness of nearly 10m. These unconformities represent the tectonic movement in the late Pleistocene period since the 80ka BP and they may be widely distributed in the North China region. They are probably the direct products of the latest tectonic movement in the Quaternary period.
(2)The present tectonic movement initiates at about 80ka BP. It not only causes multiple angular unconformity events, but also leads to the disappearance of the Hetao ancient lake. The rapid regional epeirogenetic uplifting of the Ordos block since 76.4ka BP should also be the specific manifestation of this tectonic movement. Because of the influence of the accelerated uplifting and eastward spreading of the Qinghai-Tibet plateau in the late Quaternary, the NEE thrusting effect of the Ordos block is enhanced and affected.

Key words: Haolaigou profile, Bianqianghao profile, Langshan profile, angular unconformities, the Mid-Late Quaternary, Hetao Basin

中图分类号:

P315.2

白鸾羲, 徐锡伟, 罗浩, 李康, 李梦妮, 魏雷鸣, 王启欣, 赵俊香. 河套盆地第四纪晚期不整合面的时代厘定及其构造意义讨论[J]. 地震地质, 2020, 42(4): 806-824.

BAI Luan-xi, XU Xi-wei, LUO Hao, LI Kang, LI Meng-ni, WEI Lei-ming, WANG Qi-xin, ZHAO Jun-xiang. DISCUSSION ON THE TIMING AND ITS TECTONIC SIGNIFICANCE OF ANGULAR UNCONFORMITY IN HETAO BASIN IN THE LATE QUATERNARY SEDIMENTS[J]. SEISMOLOGY AND GEOLOGY, 2020, 42(4): 806-824.

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河套盆地第四纪晚期不整合面的时代厘定及其构造意义讨论

DISCUSSION ON THE TIMING AND ITS TECTONIC SIGNIFICANCE OF ANGULAR UNCONFORMITY IN HETAO BASIN IN THE LATE QUATERNARY SEDIMENTS

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