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A layered intrusion is a large sill-like body of igneous rock which exhibits vertical layering or differences in composition and texture. These intrusions can be many kilometres in area covering from around 100 km 2 (39 sq mi) to over 50,000 km 2 (19,000 sq mi) and several hundred metres to over one kilometre (3,300 ft) in thickness. [ 1 ]
Layered intrusions: Fundamentals, novel observations and concepts, and controversial issues Author links open overlay panel R.M. Latypov a , O. Namur b , Y. Bai c , S.J. Barnes d , SYu Chistyakova a , M.B. Holness e , G. Iacono-Marziano f , W.A.J. Kruger a , B. O'Driscoll g , W.D. Smith h , V.J. Virtanen i , C.Y. Wang j , C.-M. Xing j , B ...
In geology, an igneous intrusion (or intrusive body [1] or simply intrusion [2]) is a body of intrusive igneous rock that forms by crystallization of magma slowly cooling below the surface of the Earth.
Pages in category "Layered intrusions". The following 13 pages are in this category, out of 13 total. This list may not reflect recent changes .
Layered intrusion refers to fossilized natural laboratories that are formed by the solidification and differentiation processes of basaltic magmas, resulting in stratiform bodies of cumulate rocks with various types of layering.
A layered intrusion is a set of igneous rocks emplaced into the crust of the Earth in such a way as to be exposed to eventual uplift and weathering where we can see it.
In the sections that follow, we address the fundamental observational basis of layered intrusion petrology, starting at the broadest scale and moving down to petrological, petrographic and mineralogical details.
Layered intrusions are the solid remains of ancient underground magma systems. Unlike granites or other relatively silica-rich rocks, layered intrusions are often rich in iron and magnesium.
Layered, or stratiform intrusions (banded differentiates) are bodies of igneous rocks that display a subdivision resembling stratification in sediments. This may take the form of mineral layering, or a regular compositional subdivision picked out by variations in modal mineralogy, or variations in whole-rock major- or trace-element chemistry.
Layered intrusions are important for a number of reasons. Primarily, they present a record of how mafic magmas crystallize and, as a consequence, change their compositions by the process of magmatic differentiation.
An intrusion is any body of intrusive igneous rock, formed from magma that cools and solidifies within the crust of the planet. In contrast, an extrusion consists of extrusive rock, formed above the surface of the crust.
Describes and explains processes active during cooling of magma chambers. Fully explains field and laboratory methods to study layered cumulate rocks. Recent advances on the most important localities around the world with description of their mineral resources.
Published online by Cambridge University Press: 08 March 2019. Alan Boudreau. Chapter. Get access. Cite. Summary. An introduciton to layered intrusions, including some of the problems of cumulate terminology and examples of how an originally precipitated crystal assemblage can be modified.
Friday, February 25, 2005. Chapter 12: Layered Mafic Intrusions. Large or particularly well-studied LMIs exposed in continents (many in flood basalt provinces) The form of a typical LMI. The Muskox Intrusion. Figure 12-1. From Irvine and Smith (1967), In P. J. Wyllie (ed.), Ultramafic and Related Rocks. Wiley. New York, pp. 38-49. Layering.
Large layered mafic intrusions are important for a number of reasons. They are major sources for, among others, the platinum group elements (PGEs). Also, they represent the primary evidence for fractional crystallization, a process in which molten rocks solidify by the crystallization of a series of different minerals.
The Rum layered intrusion is located in Scotland, on the island of Rùm ( Inner Hebrides ). It is a mass of intrusive rock, of mafic - ultramafic composition, [ 1] the remains of the eroded, solidified magma chamber of an extinct volcano [ 2] that was active during the Palaeogene Period. [ 3]
Layered intrusions crystallize mainly from basaltic magma to form large bodies of igneous rocks that exhibit prominent layering and they preserve stunning rock records of the processes by which magma evolves in crustal magma chambers.
A large book entitled Layered Intrusions (edited by Bernard Charlier, Olivier Namur, Rais Latypov and Christian Tegner, Springer) has been published recently. This book (almost 750 pages) has 15 contributions by 36 experts in the field.
Layered Intrusions: From Petrological Paradigms to Precious Metal Repositories. By Brian O’Driscoll, Jill A. VanTongeren. Layered mafic–ultramafic intrusions have occupied a position of central importance in the field of igneous petrology for almost a century.
Written by leading experts in the field, this work summarises the important aspects relating to layered intrusions, with almost universal coverage of the subject. Each chapter is a complete...
The Bushveld Igneous Complex is a layered mafic intrusion (LMI) with well-defined ore bodies of stratiform chromitite layers concentrated with the so-called Critical Zone; these are referred to as reefs. The three main reef deposits are the Merensky reef, UG-2 Reef, and the Platreef.
layered intrusion (plural layered intrusions) a large body of igneous rock within which distinct stratification continues over many miles
The Ilimaussaq intrusive complex is a large alkalic layered intrusion located on the southwest coast of Greenland. It is Mesoproterozoic in age, about 1.16 Ga. It is the type locality of agpaitic nepheline syenite and hosts a variety of unusual rock types.