Phlogopite 40Ar/39Ar Geochronology for Guodian Skarn Fe Deposit in Qihe–Yucheng District, Luxi Block, North China Craton: A Link between Craton Destruction and Fe Mineralization

Author:

Feng Qiwei12,Gao Mingbo23,Fu Chao45,Li Siyuan45,Li Yadong12,Gao Jilei12,Ma Ming12,Wang Zhaozhong1,Zhu Yidan6,Wu Binglu12,Duan Zhuang27,Dang Zhicai45

Affiliation:

1. No. 1 Institute of Geology and Mineral Resources of Shandong Province, Jinan 250100, China

2. Shandong Engineering Research Center of High-Grade Iron Deposits Exploration and Exploitation, Jinan 250100, China

3. Shandong Provincial Bureau of Geology & Mineral Resources, Jinan 250000, China

4. Tianjin Center of China Geological Survey, Tianjin 300170, China

5. North China Center for Geoscience Innovation, China Geological Survey, Tianjin 300170, China

6. School of Resources and Environmental Engineering, Shandong University of Technology, Zibo 255049, China

7. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China

Abstract

The Guodian Fe deposit is representative of the newly discovered Qihe–Yucheng high-grade Fe skarn ore cluster, Luxi Block, eastern North China Craton (NCC). The age of the Pandian Fe deposit remains elusive, which hinders the understanding of its metallogenic tectonic background. Phlogopites are recognized in syn-ore stages, and they are closely associated with magnetite in the Guodian skarn Fe deposit. Here, we carried out 40Ar/39Ar dating of phlogopite, which can place a tight constraint on the timing of Guodian iron mineralization and shed light on the geodynamic framework under which the Guodian Fe deposit formed. Ore-related phlogopite 40Ar/39Ar dating yielded 40Ar/39Ar plateau ages of 131.6 ± 1.7 Ma at 890–1400 °C, with the corresponding isochron age being 131.1 ± 2.6 Ma. These two ages are consistent within the error, indicating that they can represent the formation age of the Guodian iron deposit. The mineralization age overlaps the zircon U-Pb age of 124.4 Ma for ore-related Pandian pluton. This age consistency confirms that the iron skarn mineralization is temporally and likely genetically related to Pandian diorite. The present results, coupled with existing isotopic age data, indicate the Guodian skarn Fe deposit formed contemporaneously with large-scale skarn iron mineralization over the Luxi Block in the Late Mesozoic. The available data demonstrated that the eastern NCC was “destructed” in the Late Mesozoic, as marked by voluminous igneous rocks, faulted-basin formation, high crustal heat flow, and widespread metamorphic core complexes in the eastern part of the NCC. It is thus suggested that the Guodian Fe skarn deposits, together with other deposits of similar ages in the Luxi Block and even in the eastern NCC, were products of this craton destruction. Lithospheric extension and extensive magmatism related to the craton destruction may have provided sufficient heat energy, fluid, chlorine, and Fe for the formation of the Fe deposit.

Funder

Provincial geological exploration projects of Shandong Province

Technology research projects of Shandong Provincial Bureau of Geology and Mineral Resources

Open Fund of No. 1 Institute of Geology and Mineral Resources of Shandong Province

Publisher

MDPI AG

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