40Ar/39Ar AGE OF ALKALINE ROCKS OF VERHNEAMGINSKIY MASSIF (ALDAN SHIELD, SOUTH YAKUTIA)
The relevance of the research is caused by the need to expand mineral resources base, including gold-bearing ores. Large alkaline provinces, like Aldan-Stanovoy shield, are of interest because gold-bearing ores usually related to alkaline rock. They may form large and even giant deposits. Verkhneamg...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | Russian |
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Tomsk Polytechnic University
2019-03-01
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| Series: | Известия Томского политехнического университета: Инжиниринг георесурсов |
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| Online Access: | http://izvestiya.tpu.ru/archive/article/view/161/60 |
| _version_ | 1818302574075314176 |
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| author | Anton V. Ponomarchuk Ilya R. Prokopyev Anna G. Doroshkevich Irina V. Egitova Alexander A. Kravchenko Alexey I. Ivanov |
| author_facet | Anton V. Ponomarchuk Ilya R. Prokopyev Anna G. Doroshkevich Irina V. Egitova Alexander A. Kravchenko Alexey I. Ivanov |
| author_sort | Anton V. Ponomarchuk |
| collection | DOAJ |
| description | The relevance of the research is caused by the need to expand mineral resources base, including gold-bearing ores. Large alkaline provinces, like Aldan-Stanovoy shield, are of interest because gold-bearing ores usually related to alkaline rock. They may form large and even giant deposits. Verkhneamginskiy massif is located in Verkhneamginskiy ore field in Aldan-Stanovoy shield. Verkhneamginskiy ore field is the part of large Charo-Aldan metallogenic zone, its length is more than 700 km from west to east. A characteristic feature of the Verkhneamginskiy ore region is its association with the Amginsky submeridional structural zone of the tectonic melange separating the Central Aldan compound terrain in the East from the West Aldan and Tynda composite terrains in the West and South, respectively. The main aim of the research is to detect the main rock types of Verkhneamginskiy massif, to study the features of structure and composition and to identify the age of massif crystallization as well as to compare the results with the available geochronological data on Mesozoic magmatism of the Aldan shield. Methods: petrographic study and 40Ar/39Ar dating by the step heating method by phlogopite monofractions. Results. The main phases of Mesozoic alkaline magmatism are leucocratic syenites and mesocratic lamprophyres. Using the 40Ar/39Ar dating of phlogopite monofraction the authors have determined two discrete impulses: (1) 129,1.5±2,5 Ma emplacement of syenites; (2) 117,7±3,4 Ma emplacement of lamprophyre dikes. Mesozoic magmatism, manifested in Verkhneamginskiy area, demonstrates similar age boundaries with magmatic processes shown in the Aldan shield in the Mesozoic era. |
| first_indexed | 2024-12-13T05:41:04Z |
| format | Article |
| id | doaj.art-7227db6cc1244d8b99378099c6c2d183 |
| institution | Directory Open Access Journal |
| issn | 2500-1019 2413-1830 |
| language | Russian |
| last_indexed | 2024-12-13T05:41:04Z |
| publishDate | 2019-03-01 |
| publisher | Tomsk Polytechnic University |
| record_format | Article |
| series | Известия Томского политехнического университета: Инжиниринг георесурсов |
| spelling | doaj.art-7227db6cc1244d8b99378099c6c2d1832022-12-21T23:57:47ZrusTomsk Polytechnic UniversityИзвестия Томского политехнического университета: Инжиниринг георесурсов2500-10192413-18302019-03-013303283910.18799/24131830/2019/3/16140Ar/39Ar AGE OF ALKALINE ROCKS OF VERHNEAMGINSKIY MASSIF (ALDAN SHIELD, SOUTH YAKUTIA)Anton V. Ponomarchuk0Ilya R. Prokopyev1Anna G. Doroshkevich2Irina V. Egitova3Alexander A. Kravchenko4Alexey I. Ivanov5.S. Sobolev Institute of Geology and Mineralogy SBRASNovosibirsk State University; V.S. Sobolev Institute of Geology and Mineralogy SB RASV.S. Sobolev Institute of Geology and Mineralogy SB RASNovosibirsk State University; V.S. Sobolev Institute of Geology and Mineralogy SB RASNorth-Eastern Federal University of M.K. Ammosov; Geology Institute ofthe SB RASGeology Institute of the SB RASThe relevance of the research is caused by the need to expand mineral resources base, including gold-bearing ores. Large alkaline provinces, like Aldan-Stanovoy shield, are of interest because gold-bearing ores usually related to alkaline rock. They may form large and even giant deposits. Verkhneamginskiy massif is located in Verkhneamginskiy ore field in Aldan-Stanovoy shield. Verkhneamginskiy ore field is the part of large Charo-Aldan metallogenic zone, its length is more than 700 km from west to east. A characteristic feature of the Verkhneamginskiy ore region is its association with the Amginsky submeridional structural zone of the tectonic melange separating the Central Aldan compound terrain in the East from the West Aldan and Tynda composite terrains in the West and South, respectively. The main aim of the research is to detect the main rock types of Verkhneamginskiy massif, to study the features of structure and composition and to identify the age of massif crystallization as well as to compare the results with the available geochronological data on Mesozoic magmatism of the Aldan shield. Methods: petrographic study and 40Ar/39Ar dating by the step heating method by phlogopite monofractions. Results. The main phases of Mesozoic alkaline magmatism are leucocratic syenites and mesocratic lamprophyres. Using the 40Ar/39Ar dating of phlogopite monofraction the authors have determined two discrete impulses: (1) 129,1.5±2,5 Ma emplacement of syenites; (2) 117,7±3,4 Ma emplacement of lamprophyre dikes. Mesozoic magmatism, manifested in Verkhneamginskiy area, demonstrates similar age boundaries with magmatic processes shown in the Aldan shield in the Mesozoic era.http://izvestiya.tpu.ru/archive/article/view/161/60aldan-stanovoy shieldaldan shieldverhneamginskiy massifverhneamginskiy ore fieldpetrographymesozoicalkaline rock40ar/39ar dating |
| spellingShingle | Anton V. Ponomarchuk Ilya R. Prokopyev Anna G. Doroshkevich Irina V. Egitova Alexander A. Kravchenko Alexey I. Ivanov 40Ar/39Ar AGE OF ALKALINE ROCKS OF VERHNEAMGINSKIY MASSIF (ALDAN SHIELD, SOUTH YAKUTIA) Известия Томского политехнического университета: Инжиниринг георесурсов aldan-stanovoy shield aldan shield verhneamginskiy massif verhneamginskiy ore field petrography mesozoic alkaline rock 40ar/39ar dating |
| title | 40Ar/39Ar AGE OF ALKALINE ROCKS OF VERHNEAMGINSKIY MASSIF (ALDAN SHIELD, SOUTH YAKUTIA) |
| title_full | 40Ar/39Ar AGE OF ALKALINE ROCKS OF VERHNEAMGINSKIY MASSIF (ALDAN SHIELD, SOUTH YAKUTIA) |
| title_fullStr | 40Ar/39Ar AGE OF ALKALINE ROCKS OF VERHNEAMGINSKIY MASSIF (ALDAN SHIELD, SOUTH YAKUTIA) |
| title_full_unstemmed | 40Ar/39Ar AGE OF ALKALINE ROCKS OF VERHNEAMGINSKIY MASSIF (ALDAN SHIELD, SOUTH YAKUTIA) |
| title_short | 40Ar/39Ar AGE OF ALKALINE ROCKS OF VERHNEAMGINSKIY MASSIF (ALDAN SHIELD, SOUTH YAKUTIA) |
| title_sort | 40ar 39ar age of alkaline rocks of verhneamginskiy massif aldan shield south yakutia |
| topic | aldan-stanovoy shield aldan shield verhneamginskiy massif verhneamginskiy ore field petrography mesozoic alkaline rock 40ar/39ar dating |
| url | http://izvestiya.tpu.ru/archive/article/view/161/60 |
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