Unravelling the geochemistry of dark-grey to black metapelites in the Iberian Pyrite Belt (Portugal): the relation to massive sulphide ores

被引：0
作者：
Luz, Filipa [1 ]
Mateus, Antonio
机构：
[1] Univ Lisbon, Fac Ciencias, Dept Geol, Lisbon, Portugal
来源：
LIFE WITH ORE DEPOSITS ON EARTH, PROCEEDINGS OF THE 15TH SGA BIENNIAL MEETING, 2019, VOLS 1-4 | 2019年
关键词：
SEQUENCES; SHALES; ROCKS;
D O I：
暂无
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
Volcanogenic massive sulphide deposits in the Iberian Pyrite Belt can be linked with the deposition and evolution of fine-grained silicilastic sediments represented by dark-grey to black metapelites. We present a lithogeochemical study of 60 samples from the Aljustrel and Neves Corvo mines and exploration drill holes in the Portuguese IPB segment. Geochemical fingerprinting of these dark-grey to black metapelites allow us to discriminate barren from altered/mineralized samples using the ratios Al2O3/(Al2O3+Fe2O3+MnO), Fe2O3/TiO2, (As+Sb)/Sc, (Cu+Zn+Pb)/Sc, and 5x[(Fe2O3+MgO+MnO)/Al2O3]. Geochemical data indicate that sulphide mineralization in dark-grey to black metapelites does not necessarily imply that early sediments were deposited in anoxic (to euxinic) environmental conditions.
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页码：1164 / 1167
页数：4
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