|
ИСТИНА |
Войти в систему Регистрация |
Интеллектуальная Система Тематического Исследования НАукометрических данных |
||
Petrotectonic origin of mafic eclogites from the Maksyutov subduction complex, south Ural Mountains, Russiaстатья Исследовательская статья Глава в книге
Информация о цитировании статьи получена из
Scopus
Дата последнего поиска статьи во внешних источниках: 1 апреля 2022 г.
- Авторы: Fedkin V.V., Burlick T.D., Leech M.L., Shchipansky A.A., Valizer P.M., Ernst W.G.
- Сборник: Wakabayashi, J., and Dilek, Y., eds., Plate Tectonics, Ophiolites, and Societal Significance of Geology: A Celebration of the Career of Eldridge Moores: Geological Society of America Special Paper 552, p. 177–195
- Серия: Geological Society of America Special Paper
- Том: 552
- Глава в коллективной монографии
- Год издания: 2021
- Издательство: Geological Society of America
- Местоположение издательства: United States
- Первая страница: 177
- Последняя страница: 195
- Номер статьи: 13087
- DOI: 10.1130/2021.2552(09)
- Аннотация: The Maksyutov complex is a mid- to late-Paleozoic high- to ultrahigh-pressure (HPUHP)eclogite-bearing subduction-zone terrane in the South Ural Mountains. Previousreports of radial fractures emanating from quartz inclusions in garnet, omphacite, andglaucophane, graphite cuboids pseudomorphous after matrix diamond, andmicrodiamond aggregates preserved in garnet identified by Raman spectroscopyindicate that parts of the complex were subjected to physical conditions of ~600°C,>2.8 GPa for coesite- and >3.2 GPa for diamond-bearing rocks. Peak UHP eclogitefaciesmetamorphism took place at ~385 Ma, and rocks were exhumed throughretrograde blueschist-facies conditions by ~360 Ma. Bulk analyses of 18 rocks reflectthe presence of MORB, OIB, and IAT basaltic and andesitic series plus theirmetasomatized equivalents. To more fully constrain the petrotectonic evolution of thecomplex, we computed isochemical phase equilibria models for representativemetabasites in the system Na2O-CaO-K2O-FeO-MgO-Al2O3-SiO2-H2O-TiO2 basedon our new bulk-rock XRF data. Both conventional Fe-Mg exchange thermometry, andphase equilibrium modeling result in higher peak equilibrium temperatures thanpreviously reported for the complex. Pseudosection analysis provides minimum P-Tconditions of 650-675°C and 2.4-2.6 GPa for peak assemblages of the leastretrogressed Maksyutov eclogites, whereas Fe-Mg exchange thermometry yieldstemperatures of 750 ± 25°C for a pressure of 2.5 GPa. We interpret our new P-T datato reflect a thermal maximum reached by the eclogites on their initial decompressionexhumationstage, defining a metamorphic field gradient; the relict coesite andmicrodiamond aggregates previously reported testify to pressure maxima defining anearlier prograde subduction-zone gradient. The eclogitic Maksyutov complex marksunderflow of the Paleo-Asian oceanic plate rather than representing subduction of theSiberian cratonal margin.Powered
- Добавил в систему: Федькин Валентин Васильевич
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | Fedkin_2021_GSA_SPE552-09e.pdf | 2,1 МБ | 14 декабря 2021 [Fedkin] | |
| 2. | Первая страница | GSA_Titul.pdf | 496,3 КБ | 14 декабря 2021 [Fedkin] |