Internal structure of granitic pegmatites

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Published by Economic Geology Publishing Co in Urbana (Ill.) .

Written in English

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Statementby E.N. Cameron [and others].
SeriesEconomic geology -- Monograph 2
ContributionsCameron, Eugene N.
ID Numbers
Open LibraryOL20309081M

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Studies of strategic mineral deposits in the major domestic pegmatite districts by the U. Geological Survey from toprimarily for the purpose of increasing production of mica, beryllium, lithium, and tantalum minerals, resulted in the clarification of many problems related to the general.

features, Internal structure of granitic pegmatites book structure, mineralogy, and origin of granitic pegmatites. Internal Structure of Granitic Pegmatites Economic Geology Volume 2 of Economic geology and the Bulletin of the Society of Economic Geologists / Monograph: Economic geology and the Bulletin of the Society of Economic Geologists Issue 2 of Economic geology monograph, ISSN Volume 2 of Monograph / Economic Geology: Authors.

Additional Physical Format: Online version: Internal structure of granitic pegmatites. Urbana, Ill.: Economic Geology Pub.

Co., (OCoLC) Internal Structure of Granitic Pegmatites, Monograph 2, Economic Geology on *FREE* shipping on qualifying offers. Internal Structure of Granitic Pegmatites, Monograph 2, Economic GeologyManufacturer: Economic Geology Publishing Co., Urbana, Illinois, U.S.A. Granitic pegmatites (pegmatites for short here) have intrigued earth scientists for c granite Internal structure of granitic pegmatites book, the defining texture of pegmatites, was singled out and illustrated by Patrin ().Rare minerals from pegmatites attracted some of the earliest practitioners of mineralogy (e.g., Brush and Dana, ), and mineralogical studies of pegmatites have Cited by: A pegmatite is an igneous rock, formed underground, with interlocking crystals usually larger than cm in size (1 in).Most pegmatites are found in sheets of rock (dikes and veins) near large masses of igneous rocks called word pegmatite derives from Homeric Greek, πήγνυμι (pegnymi), which means “to bind together”, in reference to the intertwined crystals of.

The Puentemocha Beryl-Phosphate Granitic Pegmatite, Salamanca, Spain: Internal Structure, Petrography and Mineralogy Article (PDF Available) in The Canadian Mineralogist 50(6) January. Cerny, P. Rare-element granitic pegmatites. Part 1: Anatomy and internal evolution of pegmatite deposits.

Part 2: Regional to global environments and petrogenesis. Geoscience Canada, 18, Granitic pegmatites result from extended fractional crystallization of large granitic plutons. from the margins inward, and skeletal, radial, and graphic intergrowth habits of crystals.

The vast majority of pegmatites are granitic in composition, and this article pertains to these rocks. Internal structure of pegmatitesCited by: The classification of granitic pegmatites revisited Article (PDF Available) in The Canadian Mineralogist 43(6) December with 5, Reads How we measure 'reads'.

Pegmatites can host important deposits of ore minerals and industrial commodities, such as feldspar and mica. Their physical and chemical complexity presents daunting challenges to researchers who seek to better understand their nature and origins.

With stunning color photos and clear, authoritative text, this book provides a thorough /5(13). On the coastline of Northern Portugal, metamorphic formations and pegmatites were the subject of structural analysis with the main goal of understanding Variscan kinematics and related pegmatite intrusion.

This study also aims to discriminate, select and characterize relevant aspects of the structure and the paragenesis of pegmatites, well exposed as a result of coastal Cited by: 1.

Pegmatites are holocrystalline usually leucocratic rocks that are, at least in part, exceptionally coarse-grained, and in which extreme variations in grain size are widespread. Their dominant constituents are minerals typically found in ordinary igneous rocks.

Some pegmatites also contain less common minerals. Abstract. Vapor-undersaturated fractional crystallization experiments with Macusani glass (macusanite), a peraluminous rhyolite obsidian, at MPa yield mineralogical fabrics and zonation, and melt fractionation trends that closely resemble those found in zoned granitic pegmatites and other granitoids of comparable composition (typically peraluminous, Li-Be-Ta Cited by: Pegmatite, almost any wholly crystalline igneous rock that is at least in part very coarse grained, the major constituents of which include minerals typically found in ordinary igneous rocks and in which extreme textural variations, especially in grain size, are characteristic.

Giant crystals. The classifi cation of granitic pegmatites was frequently attempted during the past century, with variable degrees of success and applicability. Internal structure, paragenetic relationships, bulk chemical composition, petrogenetic aspects, nature of.

"granitic1' pegmatites (as opposed to "gabbroicl' pegmatites' lfsyeniticll pegmatites' etc.). Because gem minerals arel for the most part) found only in granitic pegmatites.

these will be the focal point of the ensuing discussion. Texture. Although pegmatites are commonly thought of as very coarse-grained roclzsf they ac-File Size: 1MB. the classification of granitic pegmatites revisited largely at intermediate to relatively shallow depth, and marked by a tendency to accumulate economic concentration of lithophile rare elements in the more fractionated pegmatite bodies.

This class is split here into two subclasses: REL–REE and REL–Li (Tables 1, 2, 5). Granitic Pegmatite A pegmatite is a holocrystalline intrusive igneous rock composed of interlocking phaneritic crystals usually larger than cm in size.

The word pegmatite derives from Homeric Greek (pegnymi), which means to bind together, in reference to the intertwined crystals of quartz and feldspar in the texture known as graphic granite. USGS Bulletin Q. Paper wraps, minor sunning along spine. Study of the pegmatites near Portland, CT including the Strickland, Hale, Howe, Spinelli and Anderson Quarries.

Summary of the regional geology, mineralogy, structure of pegmatite bodies and potential resources. 71 pages, includes 2 map plates in rear map pocket, 2 figures (maps) and 16 figures. Trueman, D.L. and Cerny, P. () Exploration for Rare-Element Granitic Pegmatites.

In: Cerny, P., Ed., Granitic Pegmatites in Science and Industry: Mineralogical Association of Canada Short Course Handbook, Vol. 8, has been cited by the following article: TITLE: Rare Metals (Ta-Nb-Sn) Mineralization Potential of Pegmatites of Igangan.

USGS Bulletin Q. Paper wraps, slight creasing to rear cover, minor sunning along spine. Study of the pegmatites near Portland, CT including the Strickland, Hale, Howe, Spinelli and Anderson Quarries.

Summary of the regional geology, mineralogy, structure of pegmatite bodies and potential resources. 71 pages, includes 2 map plates in rear map pocket, 2 figures (maps).

During more recent years, increasing emphasis has been placed upon interpretation of the internal structure of pegmatites, both as a means of determining their genesis and as an aid in planning exploration, development, and mining.

Most workable concentrations of pegmatite minerals are in rock units that differ markedly in one or more respects. [51] Cameron, E.N. () Internal Structure of Granitic Pegmatites, No.

Economic Geology Publishing Company, Littleton. Economic Geology Publishing Company, Littleton. [52] Jahns, R.H.

and Burnham, C.W. () Experimental Studies of Pegmatite Genesis; A Model for the Derivation and Crystallization of Granitic by: 3. From inside the book. What color common pegmatites complex composition contain cooling crystals defined diffusion dike elbaite elements emplacement eucryptite evolved experimental field fine-grained first fluid fluid inclusions fluxes footwall fractionation garnet geology granite granitic melt granitic pegmatites graphic granite growth.

granitic rocks published by Buddington (), and the Ginsburg et al. () classification which categorized pegmatites according to their depth of emplacement and relationship to metamorphism and granitic plutons.

Černý’s () revision of that classification scheme (Table 1) is the most widely used classification of pegmatites Size: KB. Four types of granitic pegmatites have been estab-lished according to internal structure and mineralogical criteria (CorbellaCorbella & Melgarejo ).

Detailed descriptions of their internal structure and min-eralogy are reported in Corbella & Melgarejo () and Alfonso et al. (), and a synthesis of these features. Miarolitic pegmatites emplaced at shallow levels under low pressure retain a vapor phase in the melt upon ascent through the Earth's crust.

Much to the satisfaction of the lucky gem or specimen miner, these ultimately form miarolitic cavities - large crystal-lined pockets, in which spectacular crystals of beryl, tourmaline, spodumene, topaz, and accessory minerals can occur. BOOK REVIEWS decipher rules of their internal structure that might assist in finding and prospecting for mineable concentrations of pegmatite minerals.

This phase has now been climaxed by the publication of Monograph 2 of the Economic Geology series-Internal Structure of Gra-nitic Pegmatites. -Uses: weighting agent in drilling muds, pigment in paints and as a weighted filler for paper and cloth, opaque to x-rays; if it is given to a patient as a drink or enema it can be used to image the shape of internal organs by x-ray.

's of years ago in Italy, called "Bologna stone" because of phosphorescence. In this paper we discuss the main petrographic models for granitic pegmatites and how these models have evolved over time. We suggest that the present state of knowledge requires that some aspects of these models to be modified, or absorbed into newer ones.

Pegmatite formation and internal evolution have long supposed the need for highly water- and flux-enriched Cited by: evidence for closing the gap between granites and granitic pegmatites.

The paper is dedicated to two Czech colleagues – Petr Černý and Milan Novák – who have devoted their lives to the study of granitic pegmatites. Keywords: granites, pegmatites, melt inclusions, intergranular melts, F- P- and B-rich melts.

In this paper we discuss the main petrogenetic models for granitic pegmatites and how these models have evolved over time.

We suggest that the present state of knowledge requires that some aspects of these models to be modified, or absorbed into newer ones.

Pegmatite formation and internal evolution have long supposed the need for highly water- and. Granitic pegmatites, which are genetically associated with intrusions of granite, are the most widely distributed and commercially valuable pegmatites.

Micaceous pegmatites are formed at great depths (more than 6 km) and consist of plagioclase, microcline, quartz, muscovite, biotite, black tourmaline, apatite, and beryl. The albite-type pegmatites are (a) IA, which is the most typical, (b) Aquelarre, which has a minor saccharoidal albite unit and has less defined internal zoning than IA, and (c) Los Chilenitos, which has features intermediate between the beryl and albite types of REL–Li pegmatites.

Southeast of these pegmatites, thin dykes of quartz +. universidade do porto – faculdade de ciÊncias departamento de geologia memÓrias n.º 9 granitic pegmatites: the state of the art international symposium field trip guidebook editors: alexandre lima & encarnaciÓn roda robles authors: Ângela almeida1, iuliu bobos1, joÃo farinha ramos 2, alexandre lima1, josÉ martinez-catalÁn 3, tÂnia martins1, fernando noronha1, alfonso.

Page LR () Internal Structure of Granitic Pegmatites. Economic Geology Monograph 2, pp Cˇerný P, London D, Novak M () Granitic pegmatites as refl ections of their sources. Elements 8: Fenn PM () The nucleation and growth of alkali feldspars from hydrous melts.

Canadian Mineralogist REE mineralogy and Australian occurrences Marcus T. Sweetapple CSIRO Earth Science and Resource Engineering Granitic pegmatites are well known for the cornucopia of their mineralogy, which includes silicates, phosphate and oxide species of both common and rare elements, some only found in granitic pegmatites.

This book presents a translation and update of the classic German textbook of Mineralogy and Petrology that has been published for decades. It provides an introduction to mineralogy, petrology, and geochemistry, discussing the principles of mineralogy, including crystallography, chemical bonding, and physical properties, and the genesis of minerals in a Brand: Springer Berlin Heidelberg.

This is a fun book to read if you have any interest in beryls. Hard to find but there are copies out there, and worth searching for. Field Collecting Gemstones and Minerals by John Sinkankas The one thing I don't like about this book is the title--there are many books on collecting rocks and minerals that are almost completely worthless.

about by the intrusion of the pegmatites; the pegmatites were associated with a granodiorite intrusive to the norrh. The Main, Dunlon, Red Crossbill, Crooker, Kinglet, and Spodumene Brook pegmatites were mapped in detail and their mineralogy and internal structure are by: 1.This mine was the first to produce potash feldspar in the Hills.

The mine also produced spodumene, columbite-tantalite, and beryl. The Hugo is a complicated pegmatite, and the knowledge gained from the study of this pegmatite has clarified many problems concerning the internal structure and genesis of zoned pegmatites (Norton, ).

The geology of the Komu area, south‐western Nigeria was investigated in order to determine the nature of occurrence, petrography and chemical composition, and to evaluate the mineral potential of granitic pegmatites.

The pegmatites are hosted by para‐gneisses, amphibolites and granitic rocks. These host rocks are characterized by low pressure mineral .

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