29 Result(s)

Article

Editorial

T. L. Grove, J. Hoefs in Contributions to Mineralogy and Petrology (2006)

Article

Unusual high-density and saline aqueous inclusions in ultrahigh pressure metamorphic rocks from Sulu terrane in eastern China

Primary high-density fluid inclusions were identified in garnet from ultrahigh pressure eclogite in the southern part of the Sulu terrane. They occur isolatedly or in cluster together with relatively low-densi...

Kun Shen, Zeming Zhang, A. M. van den Kerkhof, Yilin **ao… in Chinese Science Bulletin (2003)

Article

Microanalysis of minerals by laser ablation ICPMS and SIRMS

Due to permanent re-equilibration processes that minerals undergo during dynamic processes within the earth, minerals build up concentration profiles – mainly from rim to core – which are ideal indicators of ...

K. Simon, U. Wiechert, J. Hoefs, B. Grote in Fresenius' Journal of Analytical Chemistry (1997)

Chapter

Stable Isotope Characteristics of Recent Natrocarbonatites from Oldoinyo Lengai

Carbon and oxygen isotopic compositions of nyerereite and gregoryite phenocrysts and wholerock samples of natrocarbonatite lavas from the June 1988 eruption of Oldoinyo Lengai lie within restricted ranges of δ¹³C...

J. Keller, J. Hoefs in Carbonatite Volcanism (1995)

Chapter

Isotopic Mineralogy

Among the 340 isotopes of the 98 chemical elements occurring in the minerals of the Earth, Moon, Mars, and meteorites, the majority are nonradioacitive. Many of them are absolutely stable in accordance with th...

Yu. A. Shukolyukov, K. Wetzel, H. J. Lippolt… in Methods and Instrumentations: Results and … (1995)

Article

O, H, C isotope study of rocks from the KTB pilot hole: crustal profile and constraints on fluid evolution

The pilot hole of the Continental Deep Borehole (KTB) drilling project is located in the Bavarian Oberpfalz at the western margin of the Bohemian Massif. The 4-km deep borehole penetrated various paragneisses ...

K. Simon, J. Hoefs in Contributions to Mineralogy and Petrology (1993)

Article

Carbon and oxygen isotopic covariations in hydrothermal calcites

Isotopic covariations of carbon and oxygen in hydrothermal calcites are quantitatively modeled in terms of the following three mixing processes: (1) mixing between two different fluids which leads to the preci...

Y. -F. Zheng, J. Hoefs in Mineralium Deposita (1993)

Chapter and Conference Paper

The Carbon and Oxygen Isotope Composition of Pancreatic Stones

Human pancreatic stones consist predominantly of calcium carbonate. In this note I report on a study of the carbon and oxygen isotope composition of pancreatic calculi from three different geographic areas (In...

J. Hoefs in Chronic Pancreatitis (1990)

Article

Extreme³⁴S-Anreicherungen in gelöstem Sulfat von Grundwässern im Umfeld einer Altmülldeponie

J. D. Arneth, J. Hoefs in The Science of Nature (1989)

Article

Anomal hohe ¹³C-Gehalte in gelöstem Bicarbonat von Grundwässern im Umfeld einer Altmülldeponie

J. D. Arneth, J. Hoefs in Naturwissenschaften (1988)

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...

R. S. Harmon, J. Hoefs, K. H. Wedepohl in Contributions to Mineralogy and Petrology (1987)

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...

G. Wörner, R. S. Harmon, J. Hoefs in Contributions to Mineralogy and Petrology (1987)

Article

C- and O-isotope study of Nautilus shell and septa secreted after transfer to aquarium conditions

Chr. Spaeth, J. Hoefs in Naturwissenschaften (1986)

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...

J. Hoefs in Paleogeothermics (1986)

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...

R. S. Harmon, J. Hoefs in Andean Magmatism (1984)

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...

J. Hoefs, R. Emmermann in Contributions to Mineralogy and Petrology (1983)

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...

U. Haack, J. Hoefs, E. Gohn in Intracontinental Fold Belts (1983)

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 ...

Th. Armbruster, W. Schreyer, J. Hoefs in Contributions to Mineralogy and Petrology (1982)

Article

Buchbesprechungen

H. Sachsse, W. A. P. Luck, J. Hoefs, H. Warlimont in Naturwissenschaften (1982)

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...

U. Haack, J. Hoefs, E. Gohn in Contributions to Mineralogy and Petrology (1982)