کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8907176 1634672 2018 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Evidence of former stishovite in UHP eclogite from the South Altyn Tagh, western China
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
Evidence of former stishovite in UHP eclogite from the South Altyn Tagh, western China
چکیده انگلیسی
We report here for the first time long prism/needle-shaped polycrystalline quartz aggregates and square/parallelogram-shaped single-phase quartz inclusions in omphacite and garnet of ultrahigh pressure (UHP) eclogite from the Yinggelisayi area in the South Altyn UHP belt. Based on their morphology and mineral composition, these quartz inclusions in omphacite and garnet are quartz paramorphs after stishovite. The minimum peak pressure of the eclogite is estimated to be >8-9 GPa at 800-1000 °C based on the stability field of stishovite. This new evidence, together with previous discovery of kyanite + spineal exsolutions in former stishovite of the pelitic gneiss from the same region, suggests a ultra-deep subduction and exhumation of the South Altyn continental rocks to/from mantle depths in the stability field of stishovite. Evidence of ultra-deep subduction of continental materials might be more common and diverse than previous thought.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 484, 15 February 2018, Pages 353-362
نویسندگان
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