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Bernd Lehmann
Clausthal University of Technology
196Publications
33H-index
3,600Citations
Publications 196
Newest
#1Alexandre Raphael Cabral (UFMG: Universidade Federal de Minas Gerais)H-Index: 15
#2Armin Zeh (KIT: Karlsruhe Institute of Technology)H-Index: 27
Last.Vladislav Chrastný (CULS: Czech University of Life Sciences Prague)H-Index: 23
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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...
#1Rohit Pandey (BHU: Banaras Hindu University)H-Index: 2
#2Ashutosh N. Pandey (BHU: Banaras Hindu University)H-Index: 12
Last.Prashant Dhote Dhote (Kuwait Oil Company)
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Abstract We present petrology, geochemistry and radiogenic isotope (Sr and Nd) data of thirteen post-Deccan lamprophyre dykes in the Narmada rift zone from the Chhotaudepur alkaline province of the Deccan Large Igneous Province (DLIP). Mineralogically, these dykes show affinity towards alkaline (sannaite and camptonite) as well as ultramafic (damtjernite) varieties of lamprophyres. Their major oxides and certain trace element ratios increase with increasing silica content highlighting the strong...
#1Runsheng Yin (CAS: Chinese Academy of Sciences)H-Index: 19
#2Changzhou Deng (JLU: Jilin University)
Last.Zhuojun Xie (CAS: Chinese Academy of Sciences)
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Carlin-style (sediment-hosted, “invisible” gold) and epithermal gold deposits are commonly enriched in mercury (Hg), but the source of this metal is not well-known. In the world, the association of Hg with gold is often related to magmatism; however, it is still unclear whether magmatism serves as a direct Hg source in gold deposits or only an energy source that drives hydrothermal circulation and leaches Hg from sedimentary country rocks. Here, we use Hg stable isotopes to directly indicate the...
#1Alexandre Raphael Cabral (UFMG: Universidade Federal de Minas Gerais)H-Index: 15
#2Roman SkálaH-Index: 15
Last.Jacques Jedwab (ULB: Université libre de Bruxelles)H-Index: 13
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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...
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...
#2Alexandre Raphael Cabral (UFMG: Universidade Federal de Minas Gerais)H-Index: 15
Last.Gláucia Nascimento Queiroga (UFOP: Universidade Federal de Ouro Preto)H-Index: 7
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#1V. F. Embui (UB: University of Buea)
#2Cheo Emmanuel Suh (UB: University of Buea)H-Index: 12
Last.Bernd LehmannH-Index: 33
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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...
#1Alexandre Raphael Cabral (UFMG: Universidade Federal de Minas Gerais)H-Index: 15
#2Thomas Zack (University of Adelaide)H-Index: 7
Last.Bernd LehmannH-Index: 33
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#1Jonas AllesH-Index: 1
Last.Bernd LehmannH-Index: 33
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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...
#1Ashraf Emam (Aswan University)H-Index: 6
#2Basem Zoheir (CAU: University of Kiel)H-Index: 3
Last.Nicole NolteH-Index: 6
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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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