Zobrazeno 1 - 10
of 192
pro vyhledávání: '"I. Haapala"'
Autor:
I. Haapala
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 83, Iss 1, Pp 57-70 (2011)
Eight mineralogical expeditions during 1961–1974 to pegmatites and other mineral occurrences of eastern and southern Africa produced abundant research material. Dr. O. v. Knorring from University of Leeds, U.K., participated in some expeditions, an
Externí odkaz:
https://doaj.org/article/36a9aebe7d764d2d84a9adb3e8172a5e
Autor:
I. Haapala
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 83, Iss 1, Pp 41-55 (2011)
The alkaline lavas of Mt. Nyiragongo in the Virunga Volcanic Field (western branch of the East African Rift), as well as the granitic pegmatites and hydrothermal mineral deposits of eastern and southern Africa, were the main research topics of Profes
Externí odkaz:
https://doaj.org/article/0e37d0e9befb4f479b40140a6226f776
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 74, Iss 1-2, Pp 7-52 (2002)
Mineral ages from the A-type granites and anorthosite xenoliths in the Redrock area in the northwestern Burro Mountains in southwestern New Mexico cluster around ~1220–1225 Ma and provide yet another example of bimodal igneous activity during this
Externí odkaz:
https://doaj.org/article/c25dc342d9c84aeca6edfbef06482d34
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 74, Iss 1-2, Pp 133-146 (2002)
The Mesozoic Shahewan pluton consists of four texturally different types of biotite-hornblende quartz monzonite. In the porphyritic types alkali feldspar occurs as euhedral or ovoidal megacrysts that are often mantled by one or more plagioclase shell
Externí odkaz:
https://doaj.org/article/80d92246c57e47ba9ffd732c826da5d1
Autor:
P.A. Nurmi, I. Haapala
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 58, Iss 1, Pp 203-233 (1986)
The granitoids are divided into four main groups: synkinematic (1860‒1930 Ma, most commonly 1870‒1890 Ma), late-kinematic (1800‒1850 Ma) and postkinematic (ca. 1800 Ma) Svecokarelian granitoids, and anorogenic rapakivi granites (1540‒1700 Ma)
Externí odkaz:
https://doaj.org/article/191a04f35b504a0abdaa483fd401c4e2
Autor:
I. Haapala, P. Ojanperä
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 41, Pp 99-105 (1969)
Triplite and wolframite are described from a greisen-bordered veinlet associated with the local varieties of the Laitila rapakivi granite massif. The chemical analysis, unit cell dimensions and specific gravity are given for these minerals, and in ad
Externí odkaz:
https://doaj.org/article/ff116f77e2ed4f03acb791bcb0718353
Autor:
I. Haapala, P. Ojanperä
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 44, Iss 1, Pp 13-20 (1972)
Coexisting accessory magnetite and ilmenite -were separated and chemically analysed from five Finnish Precambrian rocks: anorogenic olivine diabase and gabbroanorthosite as well as three metamorphosed Svecofennian quartz diorites. Estimations of equi
Externí odkaz:
https://doaj.org/article/61d3bfb180cd409e847b0ea2ee3a5377
Autor:
I. Haapala, K. Laajoki
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 41, Pp 93-98 (1969)
Sphalerite with isotropic-pseudoanisotropic zoning is described from greisen in Eurajoki, SW Finland. Single-crystal X-ray studies showed that the pseudoanisotropy is due to very small chalcopyrite inclusions, oriented with their crystallographic axe
Externí odkaz:
https://doaj.org/article/7b2c68b382594e28b5a8fdce30570d74
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 43, Iss 2, Pp 221-231 (1971)
Mineral assemblages containing corundum, sapphirine and kornerupine are present in a high-grade metamorphic amphibolite-hornblendite formation near the great granulite complex of Finnish Lapland. A low-grade metamorphism has slightly retrogressed the
Externí odkaz:
https://doaj.org/article/5804c45f8a47457894a92c49a513f39b
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 41, Pp 117-124 (1969)
A monazite occurrence consisting of three monazite-bearing biotite-rich veins is described. The veins have pegmatitic affinities but are very inhomogeneous. They are located in Precambrian migmatitic cordierite-garnet gneiss or between gneiss and peg
Externí odkaz:
https://doaj.org/article/91622064e63940c2991e247b85412646