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@ARTICLE{Renik:838083,
author = {Rečnik, Aleksander and Zavašnik, Janez and Jin, Lei and
Čobić, Andrea and Daneu, Nina},
title = {{O}n the origin of iron-cross twins of pyrite from {M}t.
{K}atarina, {S}lovenia},
journal = {Mineralogical magazine},
volume = {80},
number = {6},
issn = {0026-461X},
address = {Twickenham},
publisher = {Mineralogical Society of Great Britain and Ireland},
reportid = {FZJ-2017-100006},
pages = {937 - 948},
year = {2016},
abstract = {Iron-cross twins of pyrite are well known among
mineralogists, however it is quite surprising that the
conditions of their formation remain unexplored. To address
this question we studied pyrite twins from the Upper Permian
silts of Mt. Katarina near Ljubljana (Slovenia), which
represent one of the most typical geological environments
for twinned pyrite. Mineralization of pyrite starts with a
reduction of the primary red-coloured hematite-rich sediment
by sulfide-rich fluids that penetrated the strata. A short
period of magnetite crystallization is observed prior to
pyrite crystallization, which indicates a gradual reduction
process. Sulfur isotope analysis of pyrite shows an
enrichment in δ34S, suggesting its origin from the
neighbouring red-bed deposit. Other sulfides, such as
chalcopyrite and galena, formed at the end of pyrite
crystallization. Remnants of mineralizing fluids trapped at
the interfaces between the inclusions and host pyrite show
trace amounts of Pb and Cu, indicating their presence in the
solutions throughout the period of pyrite crystallization.
An electron microscopy and spectroscopy study of twin
boundaries showed that interpenetration twinning is
accomplished through a complex 3D intergrowth of primary
{110} Cu-rich twin boundaries, and secondary {100}
boundaries that are pure. We show that approximately one
monolayer of Cu atoms is necessary to stabilize the {110}
twin structure. When the source of Cu is interrupted, the
two crystal domains continue to form {100} interfaces, that
are more favourable for pure pyrite.},
cin = {ER-C-1},
ddc = {550},
cid = {I:(DE-Juel1)ER-C-1-20170209},
pnm = {143 - Controlling Configuration-Based Phenomena (POF3-143)},
pid = {G:(DE-HGF)POF3-143},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000391201100002},
doi = {10.1180/minmag.2016.080.073},
url = {https://juser.fz-juelich.de/record/838083},
}