Unusual alteration textures in allanite a clue to

Allanite represents the primary host for LREE in weakly peraluminous granites of I and S type affinity as well as in pegmatites some skarns and to a lesser extent also in Ca rich metamorphic rocks In some of these occurrences allanite is metamict and/or altered Allanite alteration has been studied by a number of authors Of them only one

Allanite propriet composizioni usi localizzazioni » Scienze

L allanite è un minerale complesso appartenente al gruppo degli epidoti costituito da minerali silicati Il minerale fu identificato per la prima volta dal mineralogista Thomas Allan nel 1808 e prese il nome in suo onore L allanite è nota per la sua composizione variabile contenente elementi come calcio cerio lantanio ittrio ferro alluminio silicio e ossigeno

Allanite behaviour during incipient melting in the southern

The response of allanite to incipient melting was investigated in migmatites from the Tertiary Barrovian type sequence of the Central Alps southern Switzerland northern Italy Inheritance and new mineral growth were recorded in composite allanite grains sampled from meta granitoids and leucosomes Ion microprobe SHRIMP dating of high Th/U allanite cores

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Mobilization of rare earth elements during allanite fluid

The regolith hosted rare earth element REE deposits in South China are important sources of the world s REE production The alteration processes of primary REE bearing minerals in granitic bedrock remain unclear so that the pathways of REE mobilization from primary minerals to regolith hosted REE deposits have not yet been well established Allanite

allanite Dictionary of English

allanite WordReference English dictionary questions discussion and forums All Free

：6、 4（M1663、M7673、M4960Amherst County Virginia、M4976Liksviken）、2（M1697、M1679）。

セリウム TrekGEO

Ce => La Allanite La Ce => Ca Ce => Pb Epidote Pb Ce => Sr ストロンチウム Ca => Mn セリウム Al => Fe 3 セリウムフェリ ガラス

Natural Allanite Reference Materials for In Situ

Allanite is a poorly defined collection of species belonging to the epidote group In the past allanite was defined as merely being lanthanon bearing but more recently it is defined as being Ln dominant at the A2 of the allanite subgroup include allanite Ce allanite La allanite Y androsite La dissakisite Ce dollaseite Ce and khristovite Ce

Allanite Mineral information data and localities

In the older literature the name "orthite" was often used instead of allanite Visit for gemological information about Allanite Unique IdentifiersHide Mindat ID 124 as Allanite 46220 as Allanite Group Long form identifier mindat 1 1 124 5 as Allanite mindat 1 1 46220 6 as Allanite Group

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In situ Lu Hf dating of allanite by LA ICP MS/MS

Allanite is a common REE rich accessory mineral found in various igneous and metamorphic rocks and can record a variety of geological processes Therefore allanite geochronology has the potential to answer a range of important geological questions Allanite U Th Pb geochronology is hampered by common open system behavior in the system

Schematic representation of the ideal allanite Ce structure

Allanite is a common REE bearing silicate mineral which is found in potentially mineable abundances in many areas but has not been economically exploited for the REEs in an industrial scale

Allanite thorium and light rare earth element carrier in

The investigation of deeply subducted eclogites from the Dora Maira massif Western Alps reveals that accessory minerals are important hosts for trace elements Rutile contains most of the bulk rock Ti Nb and Ta while zircon hosts nearly all Zr and Hf More than 90% of the bulk rock light rare earth elements LREE and Th and about 75% of U are

Major Mines & Projects Strange Lake Project

Narsarsukite which is grey when unaltered is often tan beige indicating replacement by titanite Gittinsite is variable in colour but is commonly partially replaced by dark grey green LREE bearing allanite; replacement may take the form of salt and pepper spotting as in pegmatites or as amorphous patches

Petrology Igneous minerals Kurt Hollocher Union College

Swelling of the crystal as damage accumulates and absorption of water causes radial cracks that extend out into the surrounding minerals This allanite grain mostly has low birefringence a result of radiation damage that has essentially turned the crystal lattice into glass Plane and cross polarized light views Field width is mm

Spectroscopic characteristics of the allanite

Six allanite bearing samples from different occurrences and locations including four pegmatites and two skarns are studied The pegmatites are from the Yiyuanxing M1663 and the

Allanite Y Mineral information data and localities

Allanite Y is a member of the allanite group in the epidote key sites in the epidote supergroup minerals are A1 = M 2 A2 = M 3 M1 = M 3 M2 = M 3 M3 = M 2 O4 = O 2 O10 = OH Armbruster et al 2006 Some unnamed species are however thought to be dominantly oxidised with M3 = M 3 balanced by O replacing OH Allanite Y has the

Allanite Properties Compositons Uses Locatlions

Allanite is a complex mineral belonging to the epidote group which consists of silicate minerals The mineral was first identified by mineralogist Thomas Allan in 1808 and it was named in his honor Allanite is known for its variable composition containing elements such as calcium cerium lanthanum yttrium iron aluminum silicon and oxygen

Allanite an overview ScienceDirect Topics

Including Actinides M Hoshino Y Watanabe in Handbook on the Physics and Chemistry of Rare Earths 2016 Summarized Characteristics of HREE Rich Apatite Both the Benjamin River and the Blockspruit IOA prospects contain apatite as major REE minerals REEs leached from apatite form new monazite xenotime and in apatite grains from both