Abstract
The Hemrin Basalt (HB) is an abnormal occurrence because of its genesis, mineralogy, textures, rare native metals content, and odd geographic-geologic-tectonic setting. It occurs as a caprock for few NW/SE trending hills in a nearly flat-lying area. The HB is a high-K calc-alkaline, collision-related, continental-arc basalt and consists of diopside, labradorite and volcanic glass as the predominant constituents displaying rare firework and feathery textures. The accessory minerals in HB comprise small, discrete grains of native Ni, Fe, Cu, and Sn metals, and scattered grains of sulfides (pyrrhotite, pentlandite, molybdenite), oxides (magnetite, ilmenite, Cr-spinel), and apatite. These minerals occur as disseminated individual or composite grains of variable shapes within the groundmass of HB. Vesicle-filling secondary minerals are zeolite, calcite, anhydrite, and gypsum. The native metals were formed under reducing conditions. The reducing conditions were created as a result of assimilation of C- and S-rich sedimentary rocks by the ascending magma from the continental lithospheric mantle through the thick pile of sedimentary formations. The possible C- and S-rich rocks include the carbonates and evaporites of Fatha Formation and the Hemrin Coal Seam within the upper part of Injana Formation hosting the HB and overlying the Fatha Formation, and possibly the petroleum source, reservoir and caprocks forming the sedimentary column underlying the area. Assimilation of S from these rocks created sulfides, while assimilated C resulted in the formation of native metals.
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Acknowledgements
The whole-rock analysis of the studied HB was performed at the ACTLABS of Canada for which I am thankful. Thanks to Grant Wach for allowing the use of his labs and research facilities, Daniel MacDonald for his help in EMPA analyses, and Kenneth Martyns-Yellowe for language corrections of the manuscript, all from the Department of Earth and Environmental Sciences, Dalhousie University, Canada. I am grateful to both anonymous reviewers for reviewing the manuscript; their comments and suggestion were essential in improving the revised manuscript. This research was self-supported and did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
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Kettanah, Y.A. Rare native Ni, Fe, Cu, and Sn metals in Hemrin Basalt, northern Iraq: implications for mineral chemistry and ore genesis. Miner Petrol 117, 709–728 (2023). https://doi.org/10.1007/s00710-023-00840-3
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DOI: https://doi.org/10.1007/s00710-023-00840-3