Thomas Schirmer
Publications 2
Published on Feb 1, 2019in Mineralium Deposita 3.37
Jonas Alles1
Estimated H-index: 1
Alexander-Maria Ploch1
Estimated H-index: 1
+ 3 AuthorsBernd Lehmann32
Estimated H-index: 32
Carbonate gangue in historically important post-Variscan polymetallic Pb-Zn-Cu-Ag vein systems in the Upper Harz Mountains has elevated rare earth element contents (ΣREE+Y, 1500 ± 340 ppm; n = 16) in bulk samples. This enrichment is due to the occurrence of abundant micrometer-sized synchysite inclusions in calcite, identified via Raman spectroscopy. Calcite bulk analyses have roof-shaped PAAS-normalized REE patterns with a Eu peak but without Ce or Y anomalies and with a steeply dipping HREE pa...
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Published on Dec 1, 2017in Lithos 3.86
Alexandre Raphael Cabral15
Estimated H-index: 15
(Universidade Federal de Minas Gerais),
Armin Zeh26
Estimated H-index: 26
+ 2 AuthorsBernd Lehmann32
Estimated H-index: 32
Abstract Molybdenum enrichment in pristine organic-C-rich sedimentary rocks forms the basis for inferring the presence of dissolved oxygen in seawater. Organic matter removes dissolved hexavalent Mo from seawater where anoxic and euxinic conditions are attained. However, it is unknown whether this Mo-based proxy is retained under metamorphic conditions where organic C is no longer preserved. Here, we describe aggregates of graphite and molybdenite (MoS 2 ) containing up to 21 mass per cent of W ...
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