Manuel Keith

Manuel Keith
Friedrich-Alexander-University of Erlangen-Nürnberg | FAU · Department of Geography and Earth Sciences

23.54
 · 
Dr.

About

31
Publications
10,918
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
342
Citations
Research Experience
April 2019 - present
Friedrich-Alexander-University of Erlangen-Nürnberg
Position
  • Assistant Professor
Description
  • Geochemistry, economic geology, magmatic petrology
August 2018 - March 2019
Technische Universität Berlin
Position
  • Assistant Professor
Description
  • Geochemistry, economic geology
January 2016 - July 2018
University of Leicester
Position
  • Research Associate
Description
  • Economic geology, geochemistry

Publications

Publications (31)
Article
Full-text available
Most magmatic-hydrothermal Cu deposits are genetically linked to arc magmas. However, most continental or oceanic arc magmas are barren, and hence new methods have to be developed to distinguish between barren and mineralised arc systems. Source composition, melting conditions, the timing of S saturation and an initial chalcophile element-enrichmen...
Article
Tellurium has a wide variety of applications, most importantly in the solar energy industry and is eco-toxicologically significant; however, the magmatic-hydrothermal processes causing the pronounced Te enrichment together with Au in some epithermal districts are still poorly constrained. Hydrothermal and alkaline magmatic activity in post-subducti...
Article
Full-text available
The Troodos ophiolite, Cyprus is the principal on- land analogue for mafic-hosted volcanogenic massive sulfide (VMS) deposits. This study, for the first time, presents sulfur isotope (δ³⁴S) data on a regional scale from VMS deposits and other mineralised zones across the Troodos ophiolite. In combination δ³⁴S, Se/S ratios and trace element chemistr...
Article
The volcanogenic massive sulfide (VMS) deposits in the Troodos ophiolite (Cyprus) are ancient analogues for modern day seafloor massive sulfide mineralisation formed in a supra-subduction zone environment. In this study we present the first detailed in situ study of trace elements in sulfides from twenty VMS deposits hosted in the Troodos ophiolite...
Conference Paper
Identification of terrestrial hydrothermal processes, as signals of volcanic unrest or causes of explosive volcanic behaviour, is crucial in volcanic hazard assessment. However, the role of hydrothermal processes in triggering volcanic hazards in the marine environment remain poorly understood, hindering effective assessment. Hydrothermal vents in...
Article
Full-text available
Magnetite is a common accessory phase in various types of ore deposits. Its trace element content has proven to have critical implications regarding petrogenesis and as guides in the exploration for ore deposits in general. In this study we use LA-ICP-MS (laser ablation-inductively coupled plasma-mass spectrometry) analyses of trace elements to che...
Conference Paper
Full-text available
Hydrothermal systems with black smoker mineralization represent modern analogues to ancient volcanogenic massive sulfides (VMS). Although, the formation processes have been studied extensively at mid-ocean ridges, especially the element transport at hydrothermal fields in active island arc settings is still poorly constrained. Magmatic degassing fr...
Conference Paper
Full-text available
Understanding the pathways and processes of the sequestration of Tl in modern SMS is key to VMS genetic and geometallurgical factors1. LA-ICP-MS trace element analyses of primary colloform pyrite (Py1) and recrystallized fine­grained pyrite (Py2) and euhedral zonal pyrite (Py3), and sphalerite (Sph) (inner sulfide­barite core), and, orpiment­type A...
Article
Full-text available
Ore deposits are loci on Earth where energy and mass flux are greatly enhanced and focussed, acting as magnifying lenses into metal transport, fractionation and concentration mechanisms through the lithosphere. Here we show that the metallogenic architecture of the lithosphere is illuminated by the geochemical signatures of metasomatised mantle roc...
Conference Paper
Full-text available
Thallium (Tl) is considered as toxic for human and animal organisms, microorganisms and plants (Peter and Viraraghavan 2005; Karbowska 2016). Thallium is redox active and has two oxidation states (Tl 1+ and Tl 3+), while Tl 1+ is believed to be the most common in Tl minerals (Xiong, 2007; George et al., 2019);and, monovalent Tl (Tl 1+), that is bel...
Article
Full-text available
Table 1. Compilation of the key magmatic and hydrothermal data for the studied ore deposits.
Article
Full-text available
Epithermal gold mineralisation is found in a wide compositional range of host lithologies, but despite the diversity the alteration mineral assemblages are often similar between deposits. Notable exceptions are those gold deposits hosted in alkaline host rocks. Alkaline-hosted epithermal deposits are rare, but important, as they include some of the...
Article
The Troodos ophiolite represents one of the best-preserved fossil analogs of modern oceanic crust and includes numerous volcanic-hosted massive sulfide deposits. The Skouriotissa deposit can be separated into a stockwork ore zone and an overlying massive sulfide lens that is covered by metalliferous sediments representing the former sulfide–seawate...
Conference Paper
Full-text available
The Manus basin is a young and rapidly opening back-arc basin and has been considered a typical setting, in which VMS deposits may have formed. Water and rock samples were collected from different hydrothermal areas in the eastern Manus Basin to assess the effects of variable magmatic fluid inputs and crustal composition on vent fluid geochemistry...
Article
Submarine hydrothermal sulfide ores occur at mid-ocean ridges, intra-oceanic arcs and in back-arc basins associated with host rocks of highly variable composition. Pyrite is the dominant sulfide mineral in most samples presented within this study, and thus the trace element composition of pyrite may reflect the different metal sources and precipita...
Article
Full-text available
Experimental studies have shown that temperature, pressure, sulfur fugacity (fS2), and oxygen fugacity ( fO2) influence the Fe content of sphalerite. We present compositional in situ data on sphalerite from submarine volcanic-hosted massive sulfide (VHMS) ores of hydrothermal vents from different plate tectonic settings and with variable host-rock...
Article
Full-text available
The geochemistry and petrology of tonalitic to trondhjemitic samples ( n = 85) from eight different plagiogranite intrusions at the gabbro/sheeted dyke transition of the Troodos Ophiolite were studied in order to determine their petrogenetic relationship to the mafic plutonic section and the lava pile. The plagiogranitic rocks have higher SiO2 cont...

Projects

Projects (6)
Project
1. The chemical and mineralogical composition of magmatic sulphide globules vary between convergent and divergent plate margins. The magmatic processes that account for these differences are poorly constrained, but can be identified by comparing the chalcophile trace element composition of sulphide segregates and their host lithologies from MOR, back-arc and island arc systems. 2. Magmatic sulphide globules from MOR segments with variable spreading rate and hotspot influence are distinct in their chemical and mineralogical composition. The processes causing these differences are unknown to date, but it is likely that they are controlled by the melt source in the mantle and by processes acting during magma ascent. 3. The trace element composition of magmatic sulphide globules varies with depth in the oceanic lithosphere. The processes that cause these variations are widely unknown; samples from different sections of the crust and the upper mantle allow to investigate these processes for the first time with lithosphere depth. 4. Magmatic sulphide globules hosted in samples of different age are chemically and mineralogical distinct. This has not been investigated to date; samples recovered at variable distance from a MOR spreading centre with and without hotspot influence and from different sections of the lava pile reflect an age progression and allow to study the composition of magmatic sulphide segregates with respect to the temporal evolution of the magmatic system.
Project
1. Demonstrate that the trace metal and metalloid composition of unmineralised and least altered plutonic and volcanic to sub-volcanic host rocks of associated porphyry-epithermal deposits can be used to define the magmatic ingredients for mineralised arc formation. 2. Investigate the evolution of individual porphyry-epithermal deposits by the trace element chemistry of pyrite and magnetite hosted in different vein generations. 3. Determine key ore-forming processes on a regional scale and with stratigraphic depth in the Maronia-Leptokarya magmatic corridor (Thrace, NE Greece) by microanalytical trace element investigations. 4. Constrain the interaction processes of the magmatic and hydrothermal system by S isotopes in hydrothermal pyrite. 5. Provide insights into chalcophile trace element sourcing, fractionation and precipitation by the combined use of trace element mapping and (in situ) S isotope analyses of pyrite.
Project
1. Improve and/or substantiate the proposed Te solubility line as a function of As in pyrite (Keith et al., 2018). 2. Determine the key processes of Te deposition under a wide range of fluid conditions in Te-rich environments (e.g., eithermal and Carlin-type). 3. Demonstrate the applicability of micro-analytical techniques including trace element mapping as a potential exploration tool for Te and associated elements, such as Au and As. 4. Defining Nernst partition coefficients for Te between pyrite and fluid by experimental approaches. 5. Investigating the speciation (valence state) of Te in pyrite in hypogene and supergene ores to better understand redox-controlled effects on the Te distribution and its potential remobilisation to the environment.