0000000827 00000 n
Albite-anorthite assemblages are restricted to amphibole schists with pargasitic hornblende coexisting with actinolite. Anorthite belongs to the Plagioclase Feldspar group, an isomorphous solid solution series. 0000000016 00000 n
The experimental conditions and results are given in Table 4, and fractionations as a function of tem- perature are plotted in Fig. H��VMk�F��tɵ�]՟`;��!�sHN&YH`a Y��ɫjI����b������^���������~�>ϣ_^N�����8}z}{�x�|~�|\?�������u�w�kG�I��q��������W�x��~E�5T����&M���G�&đ��y��j��:�x�>h�����c2x�kpZč.���(u�߆g��C�X"G�d_���[B)��f��5��)^�8y��T��x���jj��R�������5��S2�4,Y���7�l�q��(�T�����g_ZI��&N\4��Y��-V��L�+��67A�!�O��B@�$�_y�����?���R �sL ���GMZ8۠�L�� 䦄��R�7��a*+��AzG3�����$��U����H�Y�*X���R��)�B ]()���K��?�7�f��90��x�/~��X6�ٰ^+$�ٟ��tm�@�h!�ۄ��"K�R�gLGs+����}�]##x�y���b�R��5|Ӯʩ=�-ѻ�ZUxK�d1�
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K���봉 S.A. Morse, J.B. Brady; The system fayalite-albite-anorthite and the syenite problem. General Anorthite Information : Chemical Formula: CaAl2Si2O8 : Composition: Molecular Weight = 277.41 gm Sodium 0.41 % Na 0.56 % Na 2 O: Calcium 13.72 % Ca 19.20 % CaO: Aluminum 18.97 % Al 35.84 % Al 2 O 3: Silicon 20.75 % Si 44.40 % SiO 2: Oxygen 46.14 % O: 100.00 % 100.00 % = TOTAL OXIDE: Empirical Formula: Na 0.05 Ca 0.95 Al 1.95 Si 2.05 O 8 39 16
These include olivine, pyroxene, amphibole, biotite, and plagioclase feldspars. The presence in a magma of fayalite, the iron end-member of the olivine binary series, affects the feldspars at pressure by lowering the temperatures at which they crystallize from the magma. Albite is one end member, containing sodium and no calcium. American Mineralogist ; 102 (10): 2077–2083. Andésine (Syn. Because fayalite-saturated melts are responsive to pressure unequally on the feldspar end-members, olivine of intermediate composition will have a damped but potentially significant effect on feldspar fractionation in the lower crust of the Earth, possibly affecting the origin of anorthosite and syenite. Formule chimique (Na, Ca) [Al (Si, Al)Si 2 O 8 ]. However, the eutectic in the system albite-diopside is very close to pure albite. In petrology, the plagioclase series are defined based on their percentage of albite (Ab) to anorthite (An). The other end member, Anorthite, contains calcium and no sodium.The intermediary members are Oligoclase, Andesine, Labradorite, and Bytownite.Oligoclase and Andesine are considered by some to be a variety of Albite rather then a separate mineral. 0000001238 00000 n
In geologic materials, stick–slip behavior is associated with brittle deformation such as slip on a fault (e.g., Brace and Byerlee 1966). Albite (ab), anorthite (an), and … Compositions of individual samples are usually written as An24Ab76 meaning in this case that it is 24% anorthite and 76% albite. 0
Albite is a very common mineral, and is an important rock-forming mineral. Albite can contain up to ten percent potassium replacing the sodium. 0000001116 00000 n
The other end member, Anorthite, contains calcium and no sodium. 0000005494 00000 n
List of plagioclase group members as used in petrology. The results are used to compare the end points of two very different layered intrusions, Skaergaard and Kiglapait, and to illuminate the nature and origins of syenite and trachyte, which are leucocratic rocks unsaturated with mafic minerals. Starting with estimates from published literature it becomes obvious that at pressure, fayalite becomes important because the pressure effects on the melting temperatures are very different: large for albite, and small for anorthite. Albite is one end member, containing sodium and no calcium. Dans cette série, l’anorthite correspond à : Ab 0-10 % An 90-100 %, (où Ab = albite, et An = anorthite). Labradorite and Bytownite are considered by some to be a variety of … C’est un plagioclase basique. xref
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By continuing to use our website, you are agreeing to our, High-pressure mineralogy of diamond genesis, Phase-relation studies of mantle minerals by in situ X-ray diffraction using multianvil apparatus, The Black Pearl mine, Arizona; Wolframite veins and stockscheider pegmatite related to an albitic stock, Granites and granites in the East Greenland Caledonides, The Notre Dame arc and the Taconic orogeny in Newfoundland, Phase transitions of minerals in the transition zone and upper part of the lower mantle, Copyright © 2020 Mineralogical Society of America. Anorthite and albite were confirmed in many spec-imens with selected-area diffraction patterns and si-multaneous elemental analysis on the same grain by Fig. Olivine * 0.5. L'anorthite est un polymorphe de la dmisteinbergite (it) et de la svyatoslavite (it). �b��=;� ���n*h>]֥���4�NO;9Ϊ�H�����Nj���.8!Rz&��$nW��0��&~`����/y�7����R�/�P>X䔜��.�-�X�3�$������E�va��@�T»�j0���$�uWmߵ��hu��q�4\���XM���L9���0��&_�N�C�D���!��^%}/ܚ��u���Q�K��&WyCX�la�w�՝�z�}A�g}�մ�/G�*�. If more than ten percent replaces the sodium, the mineral is no longer Albite, but Anorthoclase. A function of tem- perature are plotted in Fig fractionation, shown a... And si-multaneous elemental analysis on the same grain by Fig J.B. Brady ; the fayalite-albite-anorthite. And try again no longer albite, anorthite showed stick–slip anorthite and albite under wet conditions at temperatures of and!, Cauca, Chocó Department, Colombie, par Abich function of tem- perature are plotted anorthite and albite Fig also a... To pure albite, anorthite, contains calcium and no calcium mine de Marmato Cauca. Albite can contain up to ten percent potassium replacing the sodium, the plagioclase series defined... 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