Biostratigraphic correlation and chronostratigraphic framework of the Ordovician in the Ordos Basin

TANG Tiezhu; FU Rao; FAN Liyong; ZHANG Dongdong; CHEN Yanlong

doi:10.16152/j.cnki.xdxbzr.2025-02-004

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Biostratigraphic correlation and chronostratigraphic framework of the Ordovician in the Ordos Basin

更新时间：2025-04-21

- Biostratigraphic correlation and chronostratigraphic framework of the Ordovician in the Ordos Basin
- Journal of Northwest University (Natural Science Edition) Vol. 55, Issue 2, Pages: 262-276(2025)
- 作者机构：
  
  1.中国石油长庆油田公司，陕西　西安　 710069
  2.西北大学　地质学系/大陆演化与早期生命全国重点实验室/陕西省早期生命与环境重点实验室，陕西　西安　 710069
- 作者简介：
- 基金信息：
- DOI：10.16152/j.cnki.xdxbzr.2025-02-004
  CLC： P534.42
- Received：21 October 2024，
  
  Published：25 April 2025
- 稿件说明：
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TANG Tiezhu, FU Rao, FAN Liyong, et al. Biostratigraphic correlation and chronostratigraphic framework of the Ordovician in the Ordos Basin[J]. Journal of northwest university (natural science edition), 2025, 55(2): 262-276.
DOI：

TANG Tiezhu, FU Rao, FAN Liyong, et al. Biostratigraphic correlation and chronostratigraphic framework of the Ordovician in the Ordos Basin[J]. Journal of northwest university (natural science edition), 2025, 55(2): 262-276. DOI： 10.16152/j.cnki.xdxbzr.2025-02-004.

摘要

鄂尔多斯盆地奥陶系是近年来天然气资源勘探的重点层位，资源潜力巨大，但奥陶系岩石地层单位复杂，对比分歧较大，亟待开展精细的生物地层对比。该研究综合前人的牙形石和笔石生物地层研究，建立盆地内奥陶系横向对比关系，基于生物地层认为，三道坎组、桌子山组、克里摩里组以及马家沟组属于中奥陶统达瑞威尔阶，而乌拉力克组、拉什仲组以及平凉组属于上奥陶统；盆地下奥陶统生物地层研究都较为欠缺，西缘下奥陶统可识别出特马豆克期

R. manitouensis

和

G. quadraplicatus

牙形石带，在东缘发现

P. obesus

牙形石带可以与西南缘亮甲山组顶部对比；盆地中上奥陶统的生物地层研究相对较全面，三道坎组顶部产出

Histiodella

cf.

holodentata

牙形石带可与南缘麻川组以及东缘马家沟组的

D. costodus

牙形石带对比；克里摩里组至公乌素组识别出

D. tablepointensis

至

B. compressa

牙形石带，以及

P. elegans

至

N. gracilis

笔石带，可与西南缘水泉岭中上部到平凉组中部、中—东缘马家沟组中上部至峰峰组顶部对比，为达瑞威尔期至桑比期；西缘拉什仲至蛇山组产

C. bicornis

笔石带，可与西南缘平凉组中部、东南缘泾河组顶部至赵老峪组底部对比，属于桑比期中晚期；盆地西南缘的桃曲坡组产出凯迪期

Y. neimengguensis

和

Y. yaoxianensis

，可与东南缘背锅山组对比。

Abstract

The Ordovician of the Ordos Basin

with huge resource potential

has been a key target for natural gas exploration in recent years. However

the correlation of Ordovician

lithostratigraphic units in the Ordos Basin is somewhat controversial

so it is urgent to conduct a detailed stratigraphic comparison based on available paleontological data. This paper synthesizes the previous research on conodont and graptolite biostratigraphy and establishes the correlation of the Ordovician within the basin. On the basis of biostratigraphic dating

this paper suggests that the Sandaokan

Zhuozishan

Kelimoli and Majiagouformations belong to the Darriwillian

Middle Ordovician

while the Lashizhong and Pingliangformations belong to the Upper Ordovician. The biostratigraphic studies of the Lower Ordovician in the basin are relatively insufficient. In the Lower Ordovician of the western margin

the conodont zones of

R. manitouensis

and

G. quadraplicatus

in the Tremadocian can be identified

and on the eastern margin

the P. obesus Conodont Zone was discovered

which can be correlated with the top of the Liangjiashan Formation on the southwestern margin. The biostratigraphic studies of the Middle and Upper Ordovician in the basin are much comprehensive. The conodont zone of

Histiodella

cf.

holodentata

recognized at the top of the Sandaokan Formation can be correlated with the

D. costodus

zone in the Machuan Formation on the southern margin and inthe Majiagou Formation on the eastern margin. From the Kelimoli to the Gongwusu Formation

the conodont zones from

D. tablepointensis

B. compressa

and the graptolite zones from

P. elegan

s to

N. gracilis

were identified

which can be correlated with the middle-upper part of the Shuiquanling Formation to the middle of the Pingliang Formation on the southwestern margin and the middle-upper part of the Majiagou Formation to the top of the Fengfeng Formation on the middle-eastern margin

indicating a Darriwillian to Sandbianage. The graptolite zone of

C. bicornis

was recognized from the La

shizhong to Sheshan Formation on the western margin

which can be correlated with the middle of the Pingliang Formation on the southwestern margin and from the top of the Jinghe Formation to the bottom of the Zhaolaoyu Formation on the southeastern margin

suggesting amiddle-late Sandbianage. Both the Taoqupo Formation on the southwestern margin and the Beiguoshan Formation on the southeastern margin of the basin yield conodont species

Y. neimengguensis

and

Y. yaoxianensis

of the Katian

showing a correlation between them.

关键词

Keywords

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