Magmatic transition in the Ningwu iron oxide-apatite (IOA) ore district, eastern China: Implications for ore fertility of magmas

IF 3.6 2区地球科学 Q1 GEOLOGY

Ore Geology Reviews Pub Date : 2025-07-26 DOI:10.1016/j.oregeorev.2025.106814

Chao Duan , Yanhe Li , Jingwen Mao , Xuyang Meng , Kejun Hou , Qian Wang , Qiu Wan , Zengjie Zhang , Tianshun Wang , Lingxuan Zhang , Yutian He

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Abstract

Iron oxide-apatite (IOA) deposit is an important source of Fe ores, characterized by a huge amount of Fe oxide ores associated with byproducts of considerable critical mineral resources. The Ningwu ore district is a well-defined IOA ore district in eastern China, containing more than 30 IOA deposits. Four volcanic cycles occurred over approximately 10 Ma (134–126 Ma), forming two types of primary intrusive rocks (i.e., diorite porphyry and granitic rocks). The IOA deposit is typically associated with the diorite porphyry that was intruded at the end of the second volcanic cycle. In this study, the trace element abundances of zircon grains from syn-mineralization intrusive rocks and post-mineralization intrusions are distinguishable and record magmatic transitions during multistage volcanic activity. The zircon trace element abundances imply that the syn-mineralization magmas had greater oxygen fugacity (ΔFMQ > +0.5), higher water content (Eu/Eu* > 0.35, Dy/Yb < 0.21), elevated magma evolution (Zr/Hf < 50), and a high proportion of enriched mantle magma sources that are related to oceanic subduction, which significantly differed from those of the post-mineralization intrusions, reflecting a magmatic transition during multistage volcanic activity. They could also be valuable tools for identifying potential fertile magmas of IOA deposits.

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宁武氧化铁-磷灰石（IOA）矿区岩浆转变：岩浆的成矿意义

氧化铁磷灰石（IOA）矿床是铁矿的重要来源，其特征是大量的氧化铁矿石伴生有相当重要的矿产资源副产品。宁武矿区是中国东部一个明确的IOA矿区，含IOA矿床30多个。在约10 Ma （134-126 Ma）的时间内发生了4次火山旋回，形成了两种原生侵入岩（闪长斑岩和花岗质岩）。IOA矿床通常与第二次火山旋回末期侵入的闪长斑岩有关。研究结果表明，同成矿期侵入岩和成矿后侵入岩的锆石颗粒微量元素丰度可区分，记录了多期火山活动期间的岩浆转变。锆石微量元素丰度表明同成矿岩浆具有较大的氧逸度(ΔFMQ >；+0.5)，更高的含水量(Eu/Eu* >；0.35, Dy/Yb <；0.21)，隆起岩浆演化(Zr/Hf <；50)，并且与成矿后侵入有显著差异的高比例富集的地幔岩浆源与海洋俯冲有关，反映了多期火山活动期间岩浆的转变。它们也可能是识别IOA矿床潜在肥沃岩浆的宝贵工具。

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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.