Genesis of Manganese Deposits in the Ali Khanzai Block of the Zhob Ophiolite,Pakistan:Inferences from Geochemistry and Mineralogy

作     者：Muhammad Ayoub Khan Muhammad Ishaq Kakar Thomas Ulrich Liaqat Ali Andrew CKerr Khalid Mahmood Rehanul Haq Siddiqui Muhammad Ayoub Khan;Muhammad Ishaq Kakar;Thomas Ulrich;Liaqat Ali;Andrew C. Kerr;Khalid Mahmood;Rehanul Haq Siddiqui

作者机构：Center of Excellence in MineralogyUniversity of BalochistanQuettaPakistan Department of GeoscienceAarhus UniversityHoegh-Guldbergs Gade 2QK-8000 Aarhus CDenmark National Center of Excellence in GeologyUniversity of PeshawarPeshawarPakistan School of Earth and Ocean SciencesCardijf UniversityCardiffWales CF103 YEUK Department of Earth Sciences、University of SargodhaSargodhaPakistan Balochistan University of Information TechnologyEngineering and Management SciencesQuettaPakistan 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2020年第31卷第5期

页      面：884-895页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 0704[理学-天文学] 

基　　金：the six months,HRD Foreign scholarships of the Centre of Excellence in Mineralogy,University of Balochistan,Quetta,which was approved by the Higher Education Commission,Pakistan under its PSDP development project“Capacity Building and Strengthening of the Centre of Excellence in Mineralogy” partly supported by the Higher Education Commission,Pakistan“National Research Program for Universities(NRPU)Project#3593”to Muhammad Ishaq Kakar 

主　　题：Zhob ophiolite manganese ore hydrothermal genesis 

摘      要：The Zhob ophiolite comprises the Naweoba, Omzha and Ali Khanzai blocks, which are surrounded by the sediments of the Alozai Group and Loralai Formation. The Ali Khanzai Block contains metamorphic, ultramafic, gabbroic, volcanic and volcaniclastic rocks with associated chert. The Zhob manganese deposits found in the Ali Khanzai Block, occur in banded, lenticular and massive forms within red to brown coloured metachert. Braunite and pyrolusite are the main constituent manganese-bearing minerals with minor hausmannite, hematite and barite while quartz is the major gangue mineral with some carbonate minerals. Geochemical evidence from the major oxides indicates that the manganese mineralization and associated metachert at Zhob were formed by hydrothermal activity with little contribution from contemporaneous volcanic materials and this is confirmed by high Fe/Mn and low Co/Zn ratios and trace element patterns. These deposits formed along with seafloor spreading centres and were later obducted as part of Ali Khanzai Block of Zhob ophiolite.