Anorthosite - Wikipedia
Anorthosite (/ əˈnɔːrθəsaɪt /) is a phaneritic, intrusive igneous rock characterized by its composition: mostly plagioclase feldspar (90–100%), with a minimal mafic component (0–10%). Pyroxene, ilmenite, magnetite, and olivine are the mafic minerals most commonly present.
Anorthosite : Properties, Formation, Occurrence and Uses
Aug 26, 2023 · Overall, anorthosite is a significant rock type that offers insights into the complex geological processes that have shaped Earth’s crust, from magmatic differentiation to tectonic events and planetary evolution.
Recording the largest gabbro-anorthositic complex worldwide: …
Sep 1, 2022 · The Kunene Complex (KC) represents a large Mesoproterozoic igneous body, mainly composed of anorthosites and gabbroic rocks that extends from SW Angola to NW Namibia (18000 km 2, N-S trend, and ca. 350 km long and 25–50 km wide).
Anorthosite - an overview | ScienceDirect Topics
The anorthosite complex represents a semidomal structure to the south (Zebra Mountain lobe) and a long elongated body to the north. Several small mafic–ultramafic intrusions are scattered along the southern periphery of the main troctolite–anorthosite massif.
Geochemistry of massif anorthosite and associated rocks, Adirondack ...
Dec 1, 2010 · Geochemical data for a comprehensive suite of over 700 samples of massif anorthosite and associated rocks from the Adirondack Mountains, New York, exhibit a ubiquitous mixed tholeiitic and calc-alkaline signature indicating a complex petrogenesis.
Re–Os isotopic evidence for a lower crustal origin of massif-type ...
Jun 15, 2000 · Here we report rhenium and osmium isotopic data from the Rogaland anorthosite province that strongly support a lower crustal source for the parental magmas.
The Kunene Anorthosite Complex, Namibia, and Its Satellite …
The Kunene Complex of Namibia-Angola is one of the largest anorthosite massifs on Earth (up to 18,000 km 2), consisting of several distinct anorthosite and leucotroctolite intrusions.
Mesoarchean gabbro-anorthosite complex from Singhbhum Craton…
Aug 1, 2020 · The Singhbhum Craton in Peninsular India preserves some of the oldest continental crust on the globe with Hadean and Paleoarchean zircon record. Here we investigate a gabbro-anorthosite complex from the eastern margin of the craton exposed at Besoi, Kuliana, Sarat and Jashipura areas.
The Kunene complex, Angola/Namibia: a composite massif-type anorthosite …
The c. 15000 km 2, c. 2 Ga Kunene complex of southern Angola and northern Namibia is one of the world's largest occurrences of anorthositic rocks, rivalled only perhaps by the Lac St Jean massif of the Grenville Province in Quebec.
Full article: An overview of anorthosite-bearing layered intrusions …
Jan 17, 2018 · Anorthosite-bearing layered intrusions are unique to the Archaean rock record and are abundant in the Archaean craton of southern West Greenland and the Superior Province of Canada.