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Bernd Lehmann
Clausthal University of Technology
193Publications
33H-index
3,593Citations
Publications 193
Newest
Published on Mar 14, 2019in Scientific Reports 4.12
Alexandre Raphael Cabral15
Estimated H-index: 15
(UFMG: Universidade Federal de Minas Gerais),
Armin Zeh27
Estimated H-index: 27
(KIT: Karlsruhe Institute of Technology)
+ 4 AuthorsVladislav Chrastný23
Estimated H-index: 23
(CULS: Czech University of Life Sciences Prague)
Molybdenum (Mo) and its isotopes have been used to retrieve palaeoenvironmental information on the ocean–atmosphere system through geological time. Their application has so far been restricted to rocks least affected by severe metamorphism and deformation, which may erase or alter palaeoenvironmental signals. Environmental Mo-isotope signatures can be retrieved if the more manganese (Mn)-enriched rocks are isotopically depleted and the maximum range of δ98Mo values is close to the ~2.7‰ Mo-isoto...
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Published on Apr 25, 2019in Mineralogy and Petrology 1.66
Alexandre Raphael Cabral15
Estimated H-index: 15
(UFMG: Universidade Federal de Minas Gerais),
Roman Skála15
Estimated H-index: 15
+ 4 AuthorsJacques Jedwab13
Estimated H-index: 13
(ULB: Université libre de Bruxelles)
Orthocuproplatinum, Pt3Cu, is a new mineral from the Lubero region of North Kivu, Democratic Republic of the Congo. The mineral, which has a synthetic analogue, occurs as a 1.5-mm-long alluvial grain in a heavy-mineral concentrate, together with the holotype specimen of kitagohaite, Pt7Cu. The grain of orthocuproplatinum has a rim of hongshiite, PtCu, and abundant inclusions of calcite. Opaque and metallic, orthocuproplatinum has a whitish colour in reflected light and slightly perceptible aniso...
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Published on Jun 1, 2019in Journal of South American Earth Sciences 1.64
Stephanie Lohmeier , Albrecht Schneider + 1 AuthorsBernd Lehmann33
Estimated H-index: 33
Abstract The Cerro Maricunga gold project is located in the Maricunga gold belt in northern Chile, within the remnant edifice of the Tertiary Ojo de Maricunga volcano. The gold mineralization is hosted within a 23‒15 Ma old complex system of interwoven porphyry intrusions, flows, dikes and diverse breccia types, all forming part of a large diatreme system. In particular, phreatomagmatic and phreatic processes contributed to the formation of the synmineral diatreme complex. The rocks are calc-alk...
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Published on Apr 29, 2019in Terra Nova 2.23
Frederico Sousa Guimarães1
Estimated H-index: 1
,
Alexandre Raphael Cabral15
Estimated H-index: 15
(UFMG: Universidade Federal de Minas Gerais)
+ 4 AuthorsGláucia Nascimento Queiroga7
Estimated H-index: 7
(UFOP: Universidade Federal de Ouro Preto)
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Published on Apr 13, 2019
V. F. Embui (UB: University of Buea), Cheo Emmanuel Suh12
Estimated H-index: 12
(UB: University of Buea)
+ 6 AuthorsBernd Lehmann33
Estimated H-index: 33
The Ekomedion two-mica granite, southwestern Cameroon, has potential for uranium and molybdenum mineralization. Here, we present LA-ICP-MS U–Pb ages, Lu–Hf isotope characteristics, trace element concentrations and Ti-geothermometry of zircon from this granite hosting U–Mo mineralization in pegmatitic pods. The majority of zircon are CL-dark though some CL-bright cores were also identified. U–Pb zircon age data range from 121 ± 3 to 743 ± 11 Ma with only 5 of 34 ages being near concordant. The co...
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Published on Mar 1, 2019in Economic Geology 3.29
Alexandre Raphael Cabral15
Estimated H-index: 15
(UFMG: Universidade Federal de Minas Gerais),
Thomas Zack7
Estimated H-index: 7
(University of Adelaide)
+ 4 AuthorsBernd Lehmann33
Estimated H-index: 33
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Published on Feb 1, 2019in Mineralium Deposita 3.37
Jonas Alles1
Estimated H-index: 1
,
Alexander-Maria Ploch1
Estimated H-index: 1
+ 3 AuthorsBernd Lehmann33
Estimated H-index: 33
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, 2018in Arabian Journal of Geosciences 0.86
Ashraf Emam6
Estimated H-index: 6
(Aswan University),
Basem Zoheir2
Estimated H-index: 2
(CAU: University of Kiel)
+ 4 AuthorsNicole Nolte6
Estimated H-index: 6
The Nuweibi rare-metal granite in the Central Eastern Desert of Egypt is highly evolved fine- to medium-grained leucogranite affected by pervasive albitization and greisenization. The intrusion holds an important tin–tantalum resource in the Egyptian Eastern Desert. Columbite–tantalite and cassiterite disseminations occur within the granite body, while the quartz ± feldspar veins cutting across the Nuweibi granite host only cassiterite disseminations. Microscopically, quartz and alkali-feldspar ...
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