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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. L'anorthite est un polymorphe de la dmisteinbergite (it) et de la svyatoslavite (it). The rate of exchange was even faster than that of albite. Ore-bearing Granite Systems; Petrogenesis and Mineralizing Processes, The Greenland Caledonides: Evolution of the Northeast Margin of Laurentia, This site uses cookies. The experimental conditions and results are given in Table 4, and fractionations as a function of tem- perature are plotted in Fig. endstream endobj 40 0 obj <> endobj 41 0 obj <> endobj 42 0 obj <>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI]>> endobj 43 0 obj <>stream The results can be used to show that ternary feldspars saturated with fayalite and Fe monoclinic pyroxene will crystallize at a 5 kbar multiphase eutectic 1010 °C—56 °C below a calculated azeotropic point on the Ab-Or join. Albite is one end member, containing sodium and no calcium. Albite-anorthite assemblages are restricted to amphibole schists with pargasitic hornblende coexisting with actinolite. 0000004427 00000 n %%EOF 0000034181 00000 n The solid solution between albite and anorthite continues into the ternary system and is expressed by … trailer Albite-anorthite The albite-calcite and anorthite-calcite experimental data can be combined to give an albite-anorthite fractionation, shown as a function of temperature in Fig. 0000000912 00000 n 0000001238 00000 n Anorthite-calcite Exchange between anorthite and calcite was measured in three sets of experiments from 600 to 800. Anorthite and diopside form a eutectic system, as do albite and diopside. Photomicrographs of plagioclase assemblages in sample Sci 1583. 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. 39 0 obj <> endobj 0000009776 00000 n 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. Andesite par Dana) : membre intermédiaire de la série albite-anorthite pour un ratio de 50/50 ou 70/30. 0000000016 00000 n You do not currently have access to this article. Search for other works by this author on: American Mineralogist (2017) 102 (10): 2077–2083. Olivine * 0.5. 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� ��� s�cU_��@r;������#l@��^4'�yq�e`��z3�,.�F�'���3��`�ь� l�g�rwR��hP�ReX\ �;[� ��Ƙ��f&����ô�d���f;X@Up����|K��5�@&zM^Qng������ăAV�N��X6A��i�:�s'[��}`�btY�}�)�������Hpz�yL�� 5�ΰ��&���/jX�C�3��X��L�@�I;t��UP K���봉 C'est le pôle calcique de la série des feldspaths plagioclases, alors que l’ albite en constitue le pôle sodique. 39 16 Diopside * 2. 0000000827 00000 n 4. 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. The other end member, Anorthite, contains calcium and no sodium. Anorthite belongs to the Plagioclase Feldspar group, an isomorphous solid solution series. Albite can contain up to ten percent potassium replacing the sodium. x�b```e``���������π ��@Q�u�'�����=�õjUGG���b�HA��6�� ��Ә72^g�r�������j��vEi.���f�1p� A striking correlation of (Na + K) and Alrv suggests that the amphibole assemblage also is the result of decomposition. Ҍ@\` p�� 0000000616 00000 n 0000008619 00000 n Andésine (Syn. 0000005494 00000 n 54 0 obj <>stream Labradorite and Bytownite are considered by some to be a variety of … 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. Formule chimique (Na, Ca) [Al (Si, Al)Si 2 O 8 ]. 0000007588 00000 n Four separate determinations of this fractionation are seen to be in very good agreement: the … Calculate 4pSi: Orthoclase * 6. 0000009687 00000 n If more than ten percent replaces the sodium, the mineral is no longer Albite, but Anorthoclase. List of plagioclase group members as used in petrology. Nepheline, albite (final): If you reached this step, then turning orthopyroxene into olivine in #20A did not yield enough silica to make orthoclase, albite, anorthite, diopside, and olivine. The albite-anorthite system Most of the common minerals found in igneous rocks are solid-solution phases. You could not be signed in. 4. Alternate name for the plagioclase series of feldspars. Crystallization behaviour is illustrated best by using the NaAlSi 3 O 8 (albite or Ab)–CaAl 2 Si 2 O 8 (anorthite or An) plagioclase system shown in Figure 4. 0 However, the eutectic in the system albite-diopside is very close to pure albite. doi: https://doi.org/10.2138/am-2017-5762. Compositions of individual samples are usually written as An24Ab76 meaning in this case that it is 24% anorthite and 76% albite. 0000006554 00000 n startxref Albite also forms a series with Sanidine, and the intermediary member of this series is Anorthoclase.
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