Zobrazeno 1 - 10
of 50
pro vyhledávání: '"G. von Gruenewaldt"'
Publikováno v:
Mineralogy and Petrology. 56:91-103
Analytical data on the composition of plagioclase from the lower part of the Upper Zone in the eastern Bushveld Complex is presented. Detailed electron microprobe investigations failed to establish any cyclic variation through that sequence but revea
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b40a1026b74e2946d51804694852f2fb
https://doi.org/10.1007/bf01162658
https://doi.org/10.1007/bf01162658
Publikováno v:
Journal of African Earth Sciences. 21:615-632
Chromitite layers in the Critical Zone of the Bushveld complex display a systematic change in the chondrite normalized platinum group element (PGE) concentration patterns. The bell-shaped pattern of the lower layers of the lower group of chromitite l
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::065981e2f36aecd28a2e20f43513b8c6
https://doi.org/10.1016/0899-5362(95)00110-7
https://doi.org/10.1016/0899-5362(95)00110-7
Publikováno v:
Journal of African Earth Sciences. 21:607-613
Samples collected by the authors and representing three proposed parental magmas of the Bushveld complex were analyzed for their platinum group element (PGE) contents by three different laboratories. Results differ strongly between laboratories, but
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7823d49af248dec9bbab8501a45aa1a0
https://doi.org/10.1016/0899-5362(95)00105-0
https://doi.org/10.1016/0899-5362(95)00105-0
Autor:
A. Rice, G. von Gruenewaldt
Publikováno v:
Mineralogy and Petrology. 54:105-117
Shear driven coagulation/aggregation is a common method to concentrate and separate suspended particulate matter from fluids. Convective boundary layers are of primary importance in securing concentration. The theoretical indication is that ore grade
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e4f44b66485defcb21e0d12a4b3433dc
https://doi.org/10.1007/bf01162762
https://doi.org/10.1007/bf01162762
Autor:
G. von Gruenewaldt
Publikováno v:
International Geology Review. 35:987-1000
Detailed modal analyses of apatite-enriched layers in the upper 1000 m of cumulates of the Upper Zone have shown them to contain appreciable quantities of granular ilmenite. This greatly enhances the economic significance of these layers as a potenti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cf9b85cae76cf4160e96e6fd901b1b86
https://doi.org/10.1080/00206819309465570
https://doi.org/10.1080/00206819309465570
Publikováno v:
Mineralogy and Petrology. 42:71-95
Unusual facies of the Merensky Reef, the UG-2 and the UG-1 chromitite layers are developed in the western sector of the eastern Bushveld Complex. Within the basal pyroxenite of the Merensky unit, mineralization can be developed at up to four levels.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::adc97edac9233652e642193c53ce682d
https://doi.org/10.1007/bf01162685
https://doi.org/10.1007/bf01162685
Autor:
G. Von Gruenewaldt, R. E. Harmer
Publisher Summary Layered intrusions are a feature of several tectonic environments and are known from the oldest greenstone belts of the Yilgarn, Zimbabwe, and Kaapvaal Cratons to the tertiary layered intrusives associated with continental rifting,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::90dda993b3939cd942475296902d0304
https://doi.org/10.1016/s0166-2635(08)70119-1
https://doi.org/10.1016/s0166-2635(08)70119-1
Publikováno v:
Early Precambrian Basic Magmatism ISBN: 9789401066662
Large-scale layered basic intrusions are a major phenomenon in the late Archaean and early Proterozoic. The most important formed in three periods: the Stillwater Complex of southern Montana, USA at 2.7 Ga, the Great Dyke of Zimbabwe, the Jimberlana
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ea25073d07dca08374461b66feae2650
https://doi.org/10.1007/978-94-009-0399-9_4
https://doi.org/10.1007/978-94-009-0399-9_4
Association of platinum-group elements with chromitite in layered intrusions and ophiolite complexes
Publikováno v:
Economic Geology. 84:180-187
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::460276f7e435c7e2fce526b1e7407fe5
https://doi.org/10.2113/gsecongeo.84.1.180
https://doi.org/10.2113/gsecongeo.84.1.180
Publikováno v:
Economic Geology. 81:1105-1117
The "Mg number" [Mg/(Mg + Fe) atomic ratio] of bronzite in each unit at the top of the critical zone of the Bushveld Complex decreases upward in a manner consistent with fractional crystallization. The base of each unit is marked by an increase in th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f045866dbe21b64e69265e44a50e2c98
https://doi.org/10.2113/gsecongeo.81.5.1105
https://doi.org/10.2113/gsecongeo.81.5.1105