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White Mountain with 1300 m height, the Greenlandic name is ‘Qaqortorsuaq’ (i.e. Consequently, at least three geochemical end-members are required to explain the lunar anorthositic plagioclase REE variations, consistent with the geochemical fields observed in REE plots ( Fig. Most anorthosites formed during Precambrian times. This white rock is composed almost entirely of crystals of one mineral, feldspar. Feldspar is a very common mineral and occurs in virtually all igneous rocks, but rocks containing 90%+ calcium feldspar are less common. anorthositic /an aw theuh sit ik/, adj. A coarse-grained crystalline rock consisting mostly of calcic plagioclase (>90%, usually labradorite) with <10% mafics. The lunar basalts, relatively rich in iron and many also in titanium, are found in the maria. The Canadian anorthosites are thought to be laccolithic, while the Adirondack Anorthosite is considered a floored sheet. A spectacular example of this type occurs in the Gardar Igneous Province near the southern tip of Greenland, where basaltic to trachytic dikes contain thousands of anorthosite inclusions in varying states of concentration and disaggregation. Anorthosite was found in all the rocks returned from the Moon , including the oldest (dating back 4.4 to 4.5 billion years), and is believed to make up a significant fraction of the lunar crust. Anorthosite forms deep underground, and in dikes and intrusions; it makes up about 60% of the Earth's crust. The lunar highlands are … Occurrences of Proterozoic anorthosites are commonly referred to as 'massifs'. It seems likely that the cobbles and pebbles represent pieces of rock that were glacially transported from one or more of the anorthosite massifs of the Grenville Province north and northwest of Montreal, Québec, Canada. Several pure anorthosite clasts have been found in the Dhofar samples, and 60015 is an anorthosite with high abundance of plagioclase and uniform composition in comparison with other FAN samples. the big white), was observed in 1946 during fieldworkcarried out by the Geological Survey of Greenland on the west coast of Greenland. Anorthosite is also found on the lunar surface. Although these large masses are generally supposed to provide the best sample of the deep lithosphere (the outer shell of the Earth), they often appear to be floored over most of their outcrop area. The company had been working on its rare earth and found a large anorthosite body. Oxides, mostly magnetite or ilmenite, are also common. They usually occur as laccoliths (low domelike intrusions with a flat base found between sedimentary beds), lopoliths (laccoliths with basin-shaped bases), or sills … This ancient crust has been smashed and redistributed by countless meteoric impacts. In the highlands the rocks are largely anorthosites, which are relatively rich in aluminum, calcium, and silicon. /an awr theuh suyt /, n. Petrol. …a marked similarity in the anorthosites in various belts throughout the world, and their similar relationship with the gneisses suggests that the belts have undergone comparable stages of evolution, although each has its own distinctive features. westside turnout of Baughman Spring's, is an exposure of white-colored anorthosite, a rock 1220 million years old, which is also found on the lunar highlands Gabronite (706 words) [view diff] exact match in snippet view article find links to article The term anorthosite, from Frenc anorthose (term for plagioclase) was coined by Sterry Hunt. Click the. Mapped onto the Pangaean continental configuration of that eon, these occurrences are all contained in a single straight belt, and must all have been emplaced intracratonally. Hudson Resources has … The Whitestone anorthosite can be found in both the undeformed and mylonitic states. Although these large masses are generally supposed to provide the best sample of the deep lithosphere (the outer shell of the Earth), they often appear to be floored over most of their outcrop area. Updates? Little correlation can be made with rocks of Mesozoic-Cenozoic age because few modern orogenic…, kinds are basalts and anorthosites. Massif anorthosite • Layring is not found in massif anorthosite. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Large outcrop of anorthosite in the Helleren massif, Jibbeheia, Rogaland, Nor. That is, the lunar anorthosite plagioclase REE compositions define a 2-dimensional dataset. The Moon, where feldspar produces the light color more rarely, amphibole name is ‘ ’... 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