Textures and geochemistry of magnetite: indications for genesis of the Late Paleozoic Laoshankou Fe-Cu-Au deposit, NW China
作者： Pei Liang , Chao Wu , Xia Hu , Yuling Xie
DOI: 10.1016/J.OREGEOREV.2020.103632
关键词:
摘要: Abstract Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) and electron probe X-ray microanalysis (EPMA) have been employed to determine major trace elemental concentrations in magnetite from different ores the Laoshankou deposit, which is most important Fe-Cu-Au deposit northern margin of East Junggar. Two magnetite-associated paragenetic sequences defined Laoshankou, including amphibole-epidote-magnetite alteration/mineralization (stage II) pyrite-chalcopyrite mineralization III-B). On basis textures chemical compositions, we identified six generations three types ores/rocks, high-Ti inclusion-rich M-1-A inclusion-free M-1-B massive magnetite-epidote-amphibole (type H1) stage II; low-Ti, high-Si, M-1-C magnetite-sulfide H2) ubiquitous low-Ti M-2 pristine low-Si M-3 both H1 H2 types; M-4 within chalcopyrite-magnetite H3) III-B. The discriminations V versus Ti, Ca + Mn + Al Ti + V, Fe V/Ti, as well mineral assemblages element Cr (
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