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Geoscience ›› 2024, Vol. 38 ›› Issue (01): 98-116.DOI: 10.19657/j.geoscience.1000-8527.2024.011

• Metallogenic Mechanism and Prospecting Prediction of High-Grade Iron Deposit in Eastern China • Previous Articles     Next Articles

Key Ore-controlling Factors of the Skarn Type High-grade Iron Deposits in North China Craton: Constraints from Stratigraphy

ZHANG Baotao1(), MEI Zhenhua1, LI Xiuzhang2(), JIANG Xiaoping1, HU Zhaoguo1, WANG Xiaoyu1, ZHAO Xiaobo1, HU Jiabin1, LIU Sen1   

  1. 1. Geological Exploration Institute of Shandong Zhengyuan, China Metallurgical Geology Bureau, Jinan, Shandong 250013, China
    2. Geological Survey Institute of Shandong Province, Jinan, Shandong 250014, China
  • Received:2023-11-20 Revised:2023-12-30 Online:2024-02-10 Published:2024-03-20

Abstract:

The key ore-controlling factors of the skarn high-grade iron deposits in North China Craton (NCC) is a challenging topic and largely restrict the ore-prospecting directions in the future and make relevant study breakthroughs impossible.Based on the distribution pattern of typical orebodies in NCC and stratigraphy, we determined the key ore-controlling factors and their restriction mechanism.The large scale of orebodies of typical skarn high-grade iron deposits in NCC are closely related to the surrounding rock series (e.g., karst layers, gypsum beds) and they are mainly distributed in the middle Carboniferous Fengfeng Formation, the lower Majiagou formation, and the upper Majiagou Formation, which are located in the karst stratum above gypsum.The key controlling factors from stratigraphy on the mineralization of skarn type high-grade iron deposits are mainly manifested in four aspects: the vertical distribution of karst stratum restricts the favorable space for the emplacement of iron-rich orebodies; the unconformity surface controls the development of the karst system, affecting the scale of high-grade iron orebodies; the sequence stratigraphy affects the karst stages, constraining the distribution of karst layers and high-grade iron orebodies; the gypsum salt layer indicates the bottom boundary of the strongly phased karstification, limiting the favorable lower bound for hosting the high-grade iron orebodies.Consequently, the ore-prospecting model for the skarn type high-grade iron deposits in NCC was established, and seven potential mineralization spatial segments, including three major ones, were recommended in the study.The key ore-prospecting and research directions were suggested at end of the study.

Key words: key ore-controlling factor, high-grade iron deposit, skarn, stratigraphy, North China Craton

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