Paleoenvironmental evolution and isotopic stratigraphy of the Lower Cambrian in the Tarim Basin: Implications for global paleoenvironmental reconstruction

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research Pub Date : 2025-03-10 DOI:10.1016/j.gr.2025.02.022

Weijing Liu , Keyu Liu , Yaxin Shang , Yifan Zhang , Jianliang Liu , Kuanhong Yu

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Abstract

The Ediacaran-Cambrian transition marks a critical period in Earth’s history, characterized by significant shifts in continental configuration, biological evolution, climate, and ocean geochemistry. This study examines the paleoenvironmental evolution of the Lower Cambrian in the Tarim Basin, NW China, through a detailed analysis of carbon (δ¹³C), oxygen (δ¹⁸O), and strontium (⁸⁷Sr/⁸⁶Sr) isotopic stratigraphy, along with rare earth and trace elements. Using samples from the Luntan-1 and Zhonghan-1 wells, we identified substantial isotopic variations, with δ¹³C values ranging from −1.98‰ to −5.18‰ in Luntan-1 and −6.39‰ to −0.63‰ in Zhonghan-1, and ⁸⁷Sr/⁸⁶Sr ratios from 0.708709 to 0.711123 in Luntan-1 and 0.715349 to 0.725398 in Zhonghan-1. The δ¹⁸O values indicate fluctuations in ocean temperatures and regional conditions, while REE and trace elements suggest influence from submarine hydrothermal activities and variable redox conditions during deposition. The δ¹³C excursions correlate with global events such as the Basal Cambrian Carbon Isotope Excursion (BACE) and the Cambrian Explosion, linking isotopic signatures to global carbon cycle disruptions and major biological shifts. The elevated ⁸⁷Sr/⁸⁶Sr ratios reflect regional influences like continental weathering and hydrothermal activity. This study underscores the importance of redox conditions in early Cambrian ecosystem development and offers insights into the interplay of tectonics, climate, and biology during this transformative period, contributing to future paleoclimatology and geochemistry research.

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来源期刊

Gondwana Research 地学-地球科学综合

CiteScore

12.90

自引率

6.60%

发文量

298

审稿时长

65 days

期刊介绍： Gondwana Research (GR) is an International Journal aimed to promote high quality research publications on all topics related to solid Earth, particularly with reference to the origin and evolution of continents, continental assemblies and their resources. GR is an "all earth science" journal with no restrictions on geological time, terrane or theme and covers a wide spectrum of topics in geosciences such as geology, geomorphology, palaeontology, structure, petrology, geochemistry, stable isotopes, geochronology, economic geology, exploration geology, engineering geology, geophysics, and environmental geology among other themes, and provides an appropriate forum to integrate studies from different disciplines and different terrains. In addition to regular articles and thematic issues, the journal invites high profile state-of-the-art reviews on thrust area topics for its column, ''GR FOCUS''. Focus articles include short biographies and photographs of the authors. Short articles (within ten printed pages) for rapid publication reporting important discoveries or innovative models of global interest will be considered under the category ''GR LETTERS''.