Dating a sedimentary manganese ore deposit using U-Pb geochronology of hausmannite (Mn3O4) by LA-ICP-MS: An example from Heqing Mn deposit, Yunnan Province, Southwestern China

IF 3.2 2区地球科学 Q1 GEOLOGY

Ore Geology Reviews Pub Date : 2025-06-02 DOI:10.1016/j.oregeorev.2025.106711

Wen-Tian Li , Shao-Yong Jiang , Hui-Min Su , Qin Huang , Dao-Hui Pi , Wei Wang , Shugang Xiao

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Abstract

Accurately dating sedimentary manganese (Mn) deposits remains challenging due to the scarcity of suitable geochronometers. Mn oxide minerals—which host relatively high uranium (U) and low lead (Pb) concentrations—offer significant potential as a viable geochronometric tool. In this study, we report the first accurate direct measurements of in-situ U-Pb ages of hausmannite (Mn₃O₄) from the Heqing sedimentary Mn deposit (Yunnan Province, Southwestern China), obtained via laser ablation-inductively coupled mass spectrometry (LA-ICP-MS). The U-Pb age of 229.5 ± 4.5 Ma for U-bearing hausmannite aligns remarkably with the 226 ± 3.4 Ma age of interbedded basalt in the Late Triassic Mn-bearing Songgui Formation, confirming a sedimentary-diagenetic origin for this deposit. This concordance validates Mn oxide U-Pb geochronology as a novel and reliable method for dating sedimentary Mn deposits. Furthermore, these ages provide direct support for the oxic ore genetic model, indicating primary deposition of Mn as oxides in sediments. By enabling direct dating of hausmannite and other Mn oxides, this research fills a critical gap in Mn mineralization chronology. Applied globally to sedimentary Mn deposits across geological time, and leveraging Mn’s redox sensitivity, this method promises new insights into Earth’s exogenic environmental evolution.

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用LA-ICP-MS法测定hausmanite (Mn3O4) U-Pb年代学对沉积锰矿床的定年——以云南河清锰矿为例

由于缺乏合适的地质计时器，准确地测定沉积锰（Mn）矿床的年代仍然具有挑战性。锰氧化物矿物含有相对较高的铀(U)和较低的铅（Pb）浓度，作为一种可行的地质计时工具提供了巨大的潜力。在这项研究中，我们首次通过激光烧蚀-电感耦合质谱法（LA-ICP-MS）精确地直接测量了来自云南河清沉积Mn矿床的hausmanite （Mn3O4）的原位U-Pb年龄。含铀hausmannite的229.5±4.5 Ma的U-Pb年龄与晚三叠世含锰松桂组互层玄武岩的226±3.4 Ma的U-Pb年龄具有明显的一致性，确定了该矿床的沉积成岩成因。这一一致性验证了氧化锰U-Pb地质年代学作为一种新的可靠的沉积锰矿定年方法。此外，这些年龄为含氧矿成因模式提供了直接支持，表明Mn在沉积物中以氧化物形式初始沉积。通过对镁锰矿和其他锰氧化物的直接测年，本研究填补了锰成矿年代学的一个关键空白。该方法应用于全球不同地质时期的沉积Mn矿床，并利用Mn的氧化还原敏感性，有望为地球的外源环境演化提供新的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ore Geology Reviews 地学-地质学

CiteScore

6.50

自引率

27.30%

发文量

546

审稿时长

22.9 weeks

期刊介绍： Ore Geology Reviews aims to familiarize all earth scientists with recent advances in a number of interconnected disciplines related to the study of, and search for, ore deposits. The reviews range from brief to longer contributions, but the journal preferentially publishes manuscripts that fill the niche between the commonly shorter journal articles and the comprehensive book coverages, and thus has a special appeal to many authors and readers.