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Article
Natural Calcium Oxalate with Heavy Carbon
WHEWELLITE (CaC2O4, xH20) is a rare mineral, two very similar occurrences of which have been described in septarian nodules in argillaceous rocks1,2. The formation of whewellite seems to be closely related to the...
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Article
Geochemische Untersuchungen an Travertinen der Slowakei
Travertines are characterized by high rates of deposition. Waters from which travertines are precipitated have more than ten times the calcium concentration of mean continental surface waters. Calcium has been...
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Article
Die Isotopenzusammensetzung von Dolomiten und Kalken aus dem süddeutschen Malm
On dolomites and calcites from the Malm (Upper Jurassic) formation of Southern Germany δ 13C and δ 18O-determinations have been done. The most striking feature of our results is that the dolomites are isotopicall...
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Article
Fluid inclusion and carbon isotope study from bamble granulites (South Norway)
The carbon isotopic composition of CO2 from fluid inclusions in granulite facies rocks has been determined. The “primary” carbonic fluid — most probably being of Upper Mantle origin — appears to have δ 13C-values...
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Article
Age-trend in carbon isotopic composition in Paleozoic sediments
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Article
13C/12C-Verhältnisse in menschlichen Harnkonkrementen
Oxalate, uric acid, and phosphate stones have been analyzed for their carbon isotope composition. The oxalate stones show δ13C values between −17.0 and −19.5‰, the uric acid stones between −14.9 and −19.4‰, and t...
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Article
Kohlenstoffisotopen-Zusammensetzung von Hühnereierschalen
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Article
Buchbesprechungen
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Article
The sulfur and carbon isotope composition of scapolite-rich granulites from southern Tanzania
Sulfur and carbon isotope data are presented of 15 granulite samples from the Furua Complex, southern Tanzania, in which scapolite is a primary and major rock-forming constituent (up to 30 vol%). From these da...
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Article
Constraints on the origin of Damaran granites by Rb/Sr and δ18O data
The mean (87Sr/86Sr) and mean (87Rb/86Sr) ratios of the intrusive granites from the North and South of the Orogen's Central Zone plot on straight lines. These are interpreted as areal isochrons indicating the tim...
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Article
Buchbesprechungen
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Article
Very high CO2 cordierite from Norwegian Lapland: Mineralogy, petrology, and carbon isotopes
The most CO2-rich cordierite thus far encountered in nature with about 2.2 wt.% CO2 and 0.3 wt.% H2O occurs as large poikiloblasts in a strange non-foliated “reaction rock” that dissects well-foliated granulites ...
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Chapter and Conference Paper
Genesis of Damaran Granites in the Light of Rb/Sr and δ18O Data
The mean (87Sr/86Sr) and mean (87Rb/86Sr) ratios of the intrusive granites from the northern and southern parts of the Orogen’s Central Zone plot on straight lines. These are interpreted as areal isochrons indica...
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Article
The oxygen isotope composition of Hercynian granites and pre-Hercynian gneisses from the Schwarzwald, SW Germany
The oxygen isotope composition of 56 Hercynian granites and 42 pre-Hercynian gneisses has been investigated. In addition some mineral δ 18O data and 5 δD values of whole rocks have been obtained. The granites fro...
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Chapter
Oxygen Isotope Ratios in Late Cenozoic Andean Volcanics
O-isotope ratios for 127 Cenozoic volcanic rocks from the Andean Cordillera between 5°N and 4°S range from +5.2 to +14.0‰ (SMOW). Lavas from eight volcanoes in the SVZ between 36–42°S exhibit a very narrow ran...
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Chapter
Isotope geothermometers
The best available isotope thermometers of the elements oxygen, sulfur, carbon and hydrogen are summarized, and some applications to metamorphic rocks, to sulfide ore deposits and to geothermal systems are dis...
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Article
C- and O-isotope study of Nautilus shell and septa secreted after transfer to aquarium conditions
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Article
Stable isotope (O, H, S) relationships in Tertiary basalts and their mantle xenoliths from the Northern Hessian Depression, W.-Germany
18O/16O, 34S/32S, and D/H ratios as well as vacuum-fusion H2O+ contents were measured for late Tertiary volcanic basaltic rocks ranging in composition from quartz tholeiites and alkali olivine basalts to melilit...
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Article
Stable isotope relations in an open magma system, Laacher See, Eifel (FRG)
18O/16O and D/H ratios have been measured for matrix glasses and phenocrysts from the zoned phonolitic Laacher See tephra sequence (11000 y.b.p., East Eifel volcanic field, FRG) to study open-system behaviour of...
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Article
Anomal hohe 13C-Gehalte in gelöstem Bicarbonat von Grundwässern im Umfeld einer Altmülldeponie