2 edition of The Ultramafic and mafic intrusion at Näränkävaara, northeastern Finland = found in the catalog.
The Ultramafic and mafic intrusion at Näränkävaara, northeastern Finland =
Bibliography: p. 31.
|Other titles||Tiivistelmä, Näränkävaaran ultramafinen--mafinen kerrosintruusio koillismaalla.|
|Statement||T. Alapieti ... [et al.].|
|Series||Tutkimusraportti / Geologinen tutkimuslaitos ;, n:o 35 =, Report of investigation / Geological Survey of Finland,, no. 35, Tutkimusraportti (Geologinen tutkimuslaitos (Finland)) ;, n:o 35.|
|LC Classifications||QE611.5.F5 U47 1979|
|The Physical Object|
|Pagination||31 p. :|
|Number of Pages||31|
|LC Control Number||83223064|
Dunite nodules, bearing minor amounts of chromite and clinopyroxene, occur as inclusions in an isolated outcrop of alkaline basalt (limburgite) near the northwest coast of Kanaga Island in the Aleutian arc. Gabbroic inclusions with very calcic plagioclase (up to An91) are found in a nearby outcrop on the Kanaga coast, but their geological relationship, if any, to the dunitic material is unknown. The Taftafan mafic-ultramafic rocks show many similarities with the Alaskan-type mafic-ultramafic complexes, including the internal zonal lithology, bulk rock geochemistry, and mineral chemistry. Thus, it is neither related to a fragment of ophiolite sequence nor to the stratiform mafic-ultramafic intrusion.
There are four critical phases in the formation of magmatic Fe-Ni-Cu ± platinum-group element (PGE) sulfide deposits (Naldrett, a, b, ): (1) a metal-bearing, mafic or ultramafic parental magma forms by partial melting of the mantle, separates from the solid residue, ascends through the asthenospheric and lithospheric mantle, and intrudes into the crust or erupts on the surface; (2. Contemporaneous mafic-ultramafic intrusions in different tectonic domains in North Xinjiang show similar geological and geochemical signatures to the Lubei intrusion, suggesting a source region of metasomatized mantle previously modified by hydrous fluids from the slab subducted beneath the North Xinjiang region in the early Permian.
MAFIC BODIES The map shows the location of discrete shallow mafic and ultramafic bodies inferred from coincident magnetic and gravity anomalies in the eastern United States. A minimum magnetic anomaly diameter of 10 km was chosen because it spans an area that can easily be seen on the l:2,,scale map but is small. Mineral compositions and petrogenetic evolution of the ultramafic-alkaline–carbonatitic complex of Sung Valley, northeastern India. The Canadian Mineralogist, 48(1), Srivastava, R. K., & Sinha, A. K. (). Geochemistry of Early Cretaceous alkaline ultramafic-mafic complex from Jasra, Karbi Anglong, Shillong plateau, northeastern India.
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We update the magmatic stratigraphy of the Ga Näränkävaara mafic-ultramafic body, northeastern Finland, on the basis of new drill core and outcrop observations. The Paleoproterozoic mafic-ultramafic Näränkävaara layered intrusion, northern Finland, is the easternmost member of the Tornio-Näränkävaara layered intrusion belt, which comprises six mafic.
Magmatic ores form from ultramafic-mafic magmas and crystallize at high-temperature after emplacement into crustal magma chambers, and are genetically linked to the evolution of the parental magmas through space and time. The Jormua mafic-ultramafic complex is situated about 30 km NE of' Kajaani, in northeastern Finland, at the margin of the Svecokarelian fold belt (Fig.
The aim of this study is to show by detailed description that the Jormua complex represents an ophiolite in the modern sense of the term and to provide a preliminary discussion of its tectonic by: In Precambrian Geology of Finland-Key to the Evolution of the Fennoscandian Shield.
Näränkävaara Flick. The ultramafic and mafic intrusion at Näränkävaara, northeastern Finland: Näränkävaaran ultramafinen - mafinen kerrosintruusio Koillismaalla. Most of the ~20 of Finland's early Paleoproterozoic layered mafic-ultramafic intrusions are found in a roughly E-W trending, kin-long belt in northern Finland.
Known as the Tornio-N~irfinkfivaara belt, it represents a major failed rift system into which large volumes of mafic and minor A-type granite magma were intruded at ~ Ma. In the northeastern Baltic Shield, large-scale mafic-ultramafic deposits of Cu-Ni-Co, platinum group elements (PGE), and Fe-Ti-V are economically significant, in particular, concerning critical.
The Koillismaa mafic layered intrusion in northeastern Finland is part of the ∼ Ma Tornio-Näränkävaara intrusion belt. After its emplacement between the Archean basement and the overlying.
The Korab Kansi intrusion is located in the SED of Egypt (Fig. 1a) to the west of Gabal El Gerf in the geologic map of Marsa Sha'ab quadrangle (), and covers an area of about km 2 (Fig. 1b).It lies along the E-W Allaqi-Heiani suture, where the N-S Hamisana shear zone (HSZ) cuts it (Stern et al., ).The HSZ separates the Korab Kansi intrusion from ophiolitic mafic-ultramafic bodies to.
of crustal growth at Ga, Ga and Ga. Precambrian terranes are intruded by ultramafic-mafic dikes and sills that range in composition from komatiites and ultramafic-mafic lamprophyres to high-Mg basalts and low-Ti subalkaline basalts.
Geochemical characteristics of these rocks fall into three principal groups: 1). Xingdi No. 1 mafic–ultramafic intrusion is the largest in the Xingdi mafic–ultramafic belt, with an exposed area of ca.
20 km. It intruded into the Palaeoproterozoic basement. Gabbro is. Note that many non-involved intrusions are not illustrated here. Mafic–ultramafic intrusions in the Qiatekaer region form an intrusive belt with an area of 50 km E–W by 10 km N–S, and represent the western extension of the Huangshan–Jin'erquan intrusive belt (Ni–Cu ore belt.
The mafic/ultramafic complex has been emplaced in a short time period of about 20 Ma, between and Ma.
The volumetrically largest mafic and ultramafic intrusions in the province are dated in even shorter time span of only 4 Ma (Roberts et al). The SIP experienced pressures of –7 kbar corresponding to 20–30 km depth. The Bear Peak intrusive complex ultramafic-mafic rocks are similar to other ultramafic-mafic complexes in the Klamath Mountains, such as the Blue Ridge intrusion (e.g., Snoke et al., ).
The hornblende gabbro, quartz diorite, and tonalite/granodiorite units have chemical trends that contrast with one another (Fig. 8, Table 1). Book Chapter The origin of ultramafic rocks from the Berner mafic complex, central Georgia Author(s) Robert J.
Hooper Robert J. Hooper Search for other works by this author on: GSW. Google Scholar; Robert D. Hatcher, Jr. Robert D. Hatcher, Jr. Proterozoic mafic and ultramafic intrusive rocks are widespread in the Archaean Kuhmo greenstone belt, including three minor Ni—Cu deposits.
Similar intrusions have also been found in the Koli area cutting Jatulian metasediments and the underlying granitoid basement. The Koillismaa mafic layered intrusion in northeastern Finland is part of the ∼ Ma Tornio-Näränkävaara intrusion belt. After its emplacement between the Archean basement and the overlying Paleoproterozoic sedimentary-volcanic cover and its solidification, the intrusion was faulted and fragmented into several blocks.
Ultramafic to mafic layered intrusions are found in typically ancient cratons and are rare but worldwide in distribution. The intrusive complexes exhibit evidence of fractional crystallization and crystal segregation by settling or floating of minerals from a melt.
The Tonsina ultramafic‐mafic assemblage is a layered sequence whose basal rocks are dunite and harzburgite (1 km thick) overlain by a narrow zone of websterite and clinopyroxenite. Above these ultramafic rocks is a 5‐ to 6‐km thick layered gabbro that is garnet bearing at its base.
Spatially and temporally associated with the volcanic complexes within the AVT is a belt of more than 20 intrusive bodies, interpreted to have been emplaced in island-arc crust at different levels (Astrakhantsev et al., ; Batanova, ; Batanova & Astrakhantsev,; Kepezhinskas et al., ).The Galmoenan complex (14 km × 3 km), located in the southern Koryak Highland (Figs 1.
Abstract. The major deposits of platinum-group elements (PGE) of the Earth are associated with ultramafic and mafic igneous rocks. The bulk of current PGE production is extracted from narrow stratiform horizons referred to as reefs located in the lower to central portions of large layered intrusions and is dominated by the Bushveld Complex in South Africa.
Large-amplitude gravity and magnetic highs over northeast Iowa are interpreted to reflect a buried intrusive complex composed of mafic–ultramafic rocks, the northeast Iowa intrusive complex (NEIIC), intruding Yavapai province (– Ga) rocks.
Abstract. Evidence of mafic and ultramafic magmatism exists in many parts of the Dharwar craton which is divided into two blocks, the West .