Zobrazeno 1 - 10
of 29
pro vyhledávání: '"Helmut Schleicher"'
Autor:
Helmut Schleicher
Publikováno v:
Journal of the Geological Society of India. 93:305-312
Inclusions of calcite within large euhedral apatite crystals from the pyroxenite-carbonatite-syenite complex of Sevattur, Tamil Nadu, south India, were identified to represent inclusions of a primary carbonatitic melt (calcite I) from which the apati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::17f9053e104f77ab1da1b8d274281ec6
https://doi.org/10.1007/s12594-019-1178-9
https://doi.org/10.1007/s12594-019-1178-9
Autor:
Tamara Kartal, Paul G. Spry, Vasilios Melfos, Panagiotis Voudouris, Melissa Ortelli, Robert Moritz, Helmut Schleicher
Publikováno v:
The Canadian Mineralogist
Canadian Mineralogist, Vol. 51, No 2 (2013) pp. 253-284
Canadian Mineralogist, Vol. 51, No 2 (2013) pp. 253-284
The Pagoni Rachi/Kirki Cu-Mo ± Re ± Au deposit is a telescoped porphyry-epithermal system that contains molybdenite with up to 4.7 wt.% Re and the rare mineral rheniite (ReS2). The deposit is spatially related to an Oligocene, calc-alkaline hornble
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bda647a87d0b9c44388f5b573a54a5c5
Publikováno v:
European Journal of Mineralogy. 23:981-992
A selection of archaeometallurgical remains from the 3rd/4th century A.D., found in Aksum, Ethiopia, were analysed in order to determine the nature of the process by which they were produced, i.e. copper or iron smelting. Chemical and mineralogical a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3380161bf09d405169abb3bd3343b629
https://doi.org/10.1127/0935-1221/2011/0023-2167
https://doi.org/10.1127/0935-1221/2011/0023-2167
Autor:
Wilhelm van Bronswijk, Robert T. Pidgeon, Reinhardt Kurtz, Thorsten Geisler, Helmut Schleicher
Publikováno v:
American Mineralogist. 88:1496-1513
We present the results of a series of hydrothermal experiments on grains from two partially metamict zircon samples from Sri Lanka in the temperature range 350 to 650 °C and with different solutions (2 M AlCl 3 , 2 M CaCl 2 , pure H 2 O, and a multi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::52bc44b670d6e4705abea8d86ced3ed0
https://doi.org/10.2138/am-2003-1013
https://doi.org/10.2138/am-2003-1013
Autor:
Meinert Rahn, Thorsten Geisler, A. A. Rashwan, Robert T. Pidgeon, U. Poller, Helmut Schleicher, Frank Tomaschek, H. Zwingmann
Publikováno v:
Mineralogical Magazine. 67:485-508
The chemical and structural alteration of metamict zircon crystals from a 619 ±17 (2σ) Ma old, posttectonic granite in the southern part of the Eastern Desert, Egypt was studied. The crystals show simple oscillatory growth zones with metamictizatio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cde34f99ebed28c12e9f250349636cad
https://doi.org/10.1180/0026461036730112
https://doi.org/10.1180/0026461036730112
Autor:
Thorsten Geisler, Helmut Schleicher
Publikováno v:
Chemical Geology. 163:269-285
We present a simple new background modeling method particularly for the determination of trace concentrations of Pb, U and Th to date zircons chemically by electron microprobe. This method reduces the acquisition time considerably, and at the same ti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ae6e712a788a16f06cdf80450304ddce
https://doi.org/10.1016/s0009-2541(99)00099-6
https://doi.org/10.1016/s0009-2541(99)00099-6
Autor:
Shrivinas G. Viladkar, Manfred Schidlowski, Ernst Pernicka, Fatemeh Schmidt, Ulrich Kramm, Helmut Schleicher, V. Subramanian, Wolfgang Todt
Publikováno v:
Journal of Petrology. 39:1765-1785
The major, trace and rare earth element distributions as well as the contrast to the lead data, the Nd–Sr isotope data show a clear Nd, Sr, Pb, C and O isotope geochemistry of four carbonatite signature of a mantle source excluding crustal contamin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d54e4ab423d34b9f484644e2ec557d81
https://doi.org/10.1093/petroj/39.10.1765
https://doi.org/10.1093/petroj/39.10.1765
Publikováno v:
Chemical Geology. 140:261-273
The ages of Indian carbonatites are still controversial. Most of the earlier datings were done by K/Ar methods. We therefore analysed Pb/Pb ratios in carbonatites from carbonatite-alkalic complexes of Newania (NW India, Rajasthan State) and Sevattur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::93ba6253bdc7e92942db44a11535e3e4
https://doi.org/10.1016/s0009-2541(97)00022-3
https://doi.org/10.1016/s0009-2541(97)00022-3
Publikováno v:
Contributions to Mineralogy and Petrology. 115:287-302
The Moldanubian basement of the Schwarzwald contains basic to ultrabasic rocks of both crustal and mantle origin which display high-pressure mineral assemblages or relics of such. In order to constrain the P-T-t evolution of the crustal high-pressure
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::87f8b9cf3b2dc5caad9517e4e52fc3d3
https://doi.org/10.1007/bf00310768
https://doi.org/10.1007/bf00310768
Publikováno v:
Chemical Geology. 93:231-243
Lead isotopic data of alkaline volcanic rocks and carbonatites from the Kaiserstuhl are presented in combination with Sr isotopic ratios. As a whole the initial lead ratios cover the range typical for other Tertiary to Recent alkaline rock provinces
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::406eaca7bb0dafd3aabb2e56b100922e
https://doi.org/10.1016/0009-2541(91)90116-9
https://doi.org/10.1016/0009-2541(91)90116-9