High-precision U–Pb geochronology of the Guttenberg Carbon Isotope Excursion (GICE) recorded in the Tarim Basin, NW China

IF 2.6 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology Pub Date : 2025-06-04 DOI:10.1016/j.palaeo.2025.113083

Junjie Xu , Jahandar Ramezani , Huaichun Wu , Qiang Fang , Jinghui Guo , Shiling Yang , Shihong Zhang , Tianshui Yang , Zhuyin Chu

{"title":"High-precision U–Pb geochronology of the Guttenberg Carbon Isotope Excursion (GICE) recorded in the Tarim Basin, NW China","authors":"Junjie Xu , Jahandar Ramezani , Huaichun Wu , Qiang Fang , Jinghui Guo , Shiling Yang , Shihong Zhang , Tianshui Yang , Zhuyin Chu","doi":"10.1016/j.palaeo.2025.113083","DOIUrl":null,"url":null,"abstract":"<div><div>The Guttenberg Carbon Isotope Excursion (GICE) is the second significant positive excursion event during the Ordovician, accompanied by climatic change. However, the availability of highly precise geochronology directly associated with the GICE is lacking, impeding its comprehensive understanding. Here, δ<sup>13</sup>C<sub>carb</sub> chemostratigraphy is reconstructed to identify the GICE at the Upper Ordovician Yangjikan section in the Tarim Basin, Northwest China. Additionally, we provide the first high-precision <img>U–Pb zircon chemical abrasion-isotope dilution-thermal ionization mass spectrometry (CA-ID-TIMS) age of 453.29 ± 0.15 Ma (2σ analytical uncertainty) for a K-bentonite layer at the Yangjikan section. This date constrains the timing of the GICE in the Tarim Basin and indicates its synchronization with GICE records in South China and North America. Furthermore, the occurrence of the GICE coincided with contemporaneous rises in sea level for these regions, potentially suggesting that enhanced primary productivity and subsequent increased organic carbon burial have driven the GICE.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"675 ","pages":"Article 113083"},"PeriodicalIF":2.6000,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Palaeogeography, Palaeoclimatology, Palaeoecology","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0031018225003682","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"GEOGRAPHY, PHYSICAL","Score":null,"Total":0}

引用次数: 0

Abstract

The Guttenberg Carbon Isotope Excursion (GICE) is the second significant positive excursion event during the Ordovician, accompanied by climatic change. However, the availability of highly precise geochronology directly associated with the GICE is lacking, impeding its comprehensive understanding. Here, δ¹³C_carb chemostratigraphy is reconstructed to identify the GICE at the Upper Ordovician Yangjikan section in the Tarim Basin, Northwest China. Additionally, we provide the first high-precision U–Pb zircon chemical abrasion-isotope dilution-thermal ionization mass spectrometry (CA-ID-TIMS) age of 453.29 ± 0.15 Ma (2σ analytical uncertainty) for a K-bentonite layer at the Yangjikan section. This date constrains the timing of the GICE in the Tarim Basin and indicates its synchronization with GICE records in South China and North America. Furthermore, the occurrence of the GICE coincided with contemporaneous rises in sea level for these regions, potentially suggesting that enhanced primary productivity and subsequent increased organic carbon burial have driven the GICE.

查看原文本刊更多论文

塔里木盆地古腾堡碳同位素偏移（GICE）高精度U-Pb年代学

古腾堡碳同位素偏移（GICE）是奥陶纪第二次重要的正偏移事件，伴随着气候变化。然而，与GICE直接相关的高精度地质年代学的可用性缺乏，阻碍了对其的全面理解。重建了塔里木盆地上奥陶统杨基坎剖面的δ13Ccarb化学地层学，以识别GICE。此外，我们首次在杨基坎剖面进行了高精度U-Pb锆石化学磨损-同位素稀释-热电离质谱分析（CA-ID-TIMS），年龄为453.29±0.15 Ma （2σ分析不确定度）。该日期限制了塔里木盆地GICE的时间，并表明其与华南和北美GICE记录的同步。此外，GICE的发生与这些地区同期海平面上升相吻合，这可能表明初级生产力的提高和随后有机碳埋藏的增加推动了GICE的发生。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Palaeogeography, Palaeoclimatology, Palaeoecology 地学-地球科学综合

CiteScore

5.90

自引率

10.00%

发文量

398

审稿时长

3.8 months

期刊介绍： Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.