Geological and geochemical characteristics of Zankan iron deposit in the West Kunlun Mountains
Li Zhiquan1,2, Zhang Lianchang2, Xue Chunji1, Zheng Mengtian2, Hao Yanhai3, Shi Yujun3
1. China University of Geosciences, State Key Laboratory of Geological Processes and Mineral Resources, Beijing 100083;
2. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029;
3. No.2 Geological Team of Xinjiang Bureau of Geology and Mineral Resources, Kashgar, Xinjiang 844099
Zankan iron deposit is in western Taxkorgan block, West Kunlun Mountains. It has been found a large sedimentary metamorphic iron deposit recently. The amphibolites and biotite quartz schist in Paleoproterozoic Bulunkuole Group were developed as main wall rocks of the ore bodies. The granites in Early Paleozoic are exposed in the southern area; Zankan iron deposit are predominantly banded and disseminated, with a scrap of massive. Based on geological observation. This article reported the geochemical characteristics of ores and zircons U-Pb age. Geochemical analyses show the banded iron ores are enriched in REE and enriched in LREE. Ce and Y elements of ores in Zankan had no clear anomaly(Ce/Ce* =0.93～1.12、Y/Y* =0.74～1.30)but positive Eu anomaly(Eu/Eu* =1.66～4.46). The REE form is as same as the sedimentary metamorphic iron. Some zircon from granulite gave a U-Pb age of 2 416±54 Ma, which represented the sedimentary iron's formed age, and the metamorphic age was 807±51 Ma. The zircon from granite with iron ore xenoliths gave a U-Pb age of 504±26 Ma. It was obviously the granite was reformed.