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218-3 OrdoTemp: A Quality-Assessed Isotopic Proxy Database for Ordovician Temperature Reconstruction

Session: What is old is new again: Using traditional and novel geochemical proxies to reconstruct past environments and their links to changes in the Phanerozoic biosphere (Posters)

Poster Booth No.: 74

Presenting Author:

Xiaoli MA

Authors:

MA, Xiaoli¹, Deng, Yiying², Zhang, Linna³, Isson, Terry⁴, Montañez, Isabel P.⁵, Fan, Junxuan⁶r> (1) School of Earth Sciences and Engineering and Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, Jiangsu, China; State Key Laboratory of Critical Earth Material Cycling and Mineral Deposits, Nanjing University, Nanjing, Jiangsu, China, (2) School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui, China, (3) Key Laboratory of Palaeobiology and Petroleum Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, Jiangsu, China, (4) Te Aka Mātuatua, University of Waikato (Tauranga), Tauranga, Bay of Plenty, New Zealand, (5) Department of Earth and Planetary Sciences, University of California, Davis, Davis, California, USA; Institute of the Environment, University of California, Davis, Davis, California, USA, (6) School of Earth Sciences and Engineering and Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, Jiangsu, China; State Key Laboratory of Critical Earth Material Cycling and Mineral Deposits, Nanjing University, Nanjing, Jiangsu, China,

Abstract:

The Ordovician was a pivotal interval in Earth history, marked by major biodiversity diversification and extinction events linked to climate change. Robust palaeotemperature reconstructions are essential for understanding its climate evolution, yet reliable fossil isotope archives are scarce, while abundant bulk-carbonate oxygen isotope (δ¹⁸O) records remain challenging to interpret due to high susceptibility to diagenetic alteration. Here, we develop a transparent multi-criteria quality-control framework integrating stratigraphic, petrographic, sedimentological, and geochemical constraints to evaluate the preservation of individual isotopic proxy values. Applying this framework, we construct OrdoTemp, a curated dataset of 5,299 screened proxy values from 15,406 measurements, including bulk-carbonate and fossil δ¹⁸O (96.5%), and also a smaller subset of carbonate clumped isotope (Δ₄₇) data (3.5%). With high temporal coverage (~60 kyr median age spacing), OrdoTemp enables high-resolution Ordovician temperature reconstruction and provides a reproducible framework for deep-time δ¹⁸O proxy synthesis.

OrdoTemp: A Quality-Assessed Isotopic Proxy Database for Ordovician Temperature Reconstruction

Description

Session Format: Poster

Presentation Date: 10/13/2026

Presentation Room: CCC, Hall F

Poster Booth No.: 74

Author Availability: 2:00 to 4:00 p.m.

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