Results 181 to 190 of about 3,709 (226)
Some of the next articles are maybe not open access.
Metallogeny of the Rapakivi granites
Mineralogy and Petrology, 1995Two major types of ore deposits occur with Proterozoic rapakivi granite plutons: (1) greisen-, vein-, und skarn-type Sn(-W-Be-Zn-Cu-Pb) deposits associated with specialized late-stage granites, and (2) Fe oxide-Cu (-U-Au-Ag) deposits.
openaire +1 more source
Mineralogy and Petrology, 1994
The dyke-like 1.63 Ga Jaala-Iitti rapakivi complex forms a 25 km long and up to 2 km wide intrusive body at the northwestern margin of the Wiborg rapakivi batholith cutting both the granites of the batholith and the surrounding 1.9 Ga Svecofennian crust.
P. T. Salonsaari, I. Haapala
openaire +1 more source
The dyke-like 1.63 Ga Jaala-Iitti rapakivi complex forms a 25 km long and up to 2 km wide intrusive body at the northwestern margin of the Wiborg rapakivi batholith cutting both the granites of the batholith and the surrounding 1.9 Ga Svecofennian crust.
P. T. Salonsaari, I. Haapala
openaire +1 more source
The Genesis of the Rapakivi Granites
Geologiska Föreningen i Stockholm Förhandlingar, 1937(1937). The Genesis of the Rapakivi Granites. Geologiska Foreningen i Stockholm Forhandlingar: Vol. 59, No. 4, pp. 503-524.
openaire +1 more source
Rapakivi granites and related rocks: an introduction
Precambrian Research, 1999Abstract This article is an introductory chapter for the proceedings of the last, seventh, meeting of the International Geological Correlation Programme (IGCP) Project 315 “Correlation of Rapakivi Granites and Related Rocks on a Global Scale”, 1991–1996.
openaire +1 more source
The Problems of the Rapakivi Granites
The Journal of Geology, 1938The rapakivi granites of Fennoscandia, characterized by Johannsen as "abnormal," include coarse-grained rocks having a peculiar ovoidal texture, controlled by the form of their potassium feldspars, which formerly served to define the whole group. When, however, it was realized that associated with the ovoidal varieties there are related granites having
openaire +1 more source
Rapakivi granites, South Greenland: hydrothermal alteration of igneous layering
Journal of the Geological Society, 1990Igneous layering is developed in the Proterozoic rapakivi granite suite of South Greenland in an area on the south-easternmost coast of the island of Angnikitsoq. The layering at this locality is unusual in that it is defined by interstitial phases. We suggest that large-scale hydrothermal alteration has converted a fine-grained pyroxene cumulate, in ...
ADRIAN A. FINCH +3 more
openaire +1 more source
Rapakivi granites from Brazil and adjacent areas
Precambrian Research, 1999Abstract A review of the rapakivi magmatism in Brazil and adjacent areas demonstrates that the dominantly felsic anorogenic complexes of the Amazonian craton can be considered as rapakivi suites. They are found in almost all provinces of the craton and are concentrated in the timespan covering the end of the Palaeoproterozoic until the beginning of ...
openaire +1 more source
Petrology of rapakivi granites in Salmi massif
International Geology Review, 1968Crystallization of rapakivi is accompanied by a progressive decrease in the alkali content of the high-temperature granitic magma and by the concurrent increase in its iron content, during the crystallization of potassium feldspar which is followed by the crystallization of biotite.
openaire +1 more source
Rapakivi Granite of Ezhimala Complex and its Significance
Journal Geological Society of India, 1982Abstract The field characters, chemistry and the spatial association of the 678 m.y. old Rapakivi granite with gabbros and anorthosites suggest that these litho-units have developed through bimodal magmatic processes whereby heat derived from basic magma parental to the anorthositic rocks caused partial melting at or near the base of the
M. M. Nair, K. T. Vidyadharan
openaire +1 more source