HE Chao-xin1, CHEN Cui-hua1, LI You-guo1, ZHANG Yan1, LI Chang-shan1, YIN Li1, SONG Yu-kun 1, TU Zong-lin1, DING Xue-kuan2, RAO Cheng2
(1. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China;
2. Yilong County Land and Resources Bureau of Sichuan Province, Nanchong 637600, China)
Abstract: Qimantage-Dulan metallogenic belt is mainly of iron and copper polymetallic metallogenic belt of Qinghai province, with its mineral-rich but low research degree. Shuangqing Iron Deposit is very typical deposit located the metallogenic belt. There is currently no mineral geochemical study on that. In order to provide geochemical evidence for deposit genesis, this article studies geochemical characteristics of the major elements and trace elements in magnetite by using electron microprobe, inductively coupled plasma mass spectrometry (ICP-MS) and other testing methods, to supplement magnetite oxygen isotope data. The TiO2-Al2O3-(MgO+MnO)triangle formation diagram for magnetite major elements shows that the formation genesis of the magnetite in Shuangqing Iron Deposit is typical skarn magnetite of the contact metasomatic origin; geochemical characteristics of trace elements in magnetite indicate its deeper ore-forming material source, and the ratios of Ni/Co indicates that magnetite source is of volcanic hydrothermal metasomatic with magma genesis characteristics, while the contents of Pb and Zn are relatively high, indicating a late hydrothermal superimposition；REE is asymmetric “V”-shaped distributed, and LREE and HREE occur to a certain extent differentiation process. REE have no obvious δEu and δCe anomaly characteristics with low ∑REE. Oxygen isotopic characteristics of magnetite shows that its ore-forming material belongs to mantle source and the fluid source belongs granitic magma water.
Keywords: Geochemistry; Magnetite; the significance of Causes; Shuangqing Iron Deposit; Qinghai Province
Email: chencuihua@cdut.edu.cn
ACTA MINERALOGICA SINICA Vol. 35, No. 3, 2015, Page 359-364
