کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8910503 | 1637499 | 2017 | 55 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Metasomatic PGE mobilization by carbonatitic melt in the mantle: Evidence from sub-μm-scale sulfide-carbonaceous glass inclusion in Tahitian harzburgite xenolith
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
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![عکس صفحه اول مقاله: Metasomatic PGE mobilization by carbonatitic melt in the mantle: Evidence from sub-μm-scale sulfide-carbonaceous glass inclusion in Tahitian harzburgite xenolith Metasomatic PGE mobilization by carbonatitic melt in the mantle: Evidence from sub-μm-scale sulfide-carbonaceous glass inclusion in Tahitian harzburgite xenolith](/preview/png/8910503.png)
چکیده انگلیسی
Here, we report a sub-micrometer-sized sulfide-glass inclusion array in a Tahitian harzburgite xenolith. The textural and chemical characteristics were disclosed with employing synchrotron X-ray and transmission electron microscope analyses. The results demonstrate that the sulfide and glass contain appreciable amounts of PGE (9.7 at.% Ir, 4.3 at.% Rh and 5.8 at.% Pt) and carbon (21.2 at.% C), respectively. The sulfide-glass inclusion array is hosted in sodium-enriched clinopyroxene (up to 1.8Â wt% Na2O) that shows vein-like distribution and partly replaces orthopyroxene. Primitive mantle-normalized trace-element patterns of the clinopyroxene show a general increase from heavy rare-earth elements (REEs) to light REEs with negative anomalies in Pb and high-field-strength elements such as Zr, Hf and Ti, which indicate equilibration with Mg-rich carbonatitic melt. These results suggest that Na-bearing Mg-rich carbonatitic melts were involved in the harzburgite formation and that Ir, Rh and Pt were mobilized through carbonatitic metasomatism and eventually distributed in the sulfides.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Geology - Volume 475, 25 December 2017, Pages 87-104
Journal: Chemical Geology - Volume 475, 25 December 2017, Pages 87-104
نویسندگان
Norikatsu Akizawa, Akira Miyake, Akira Ishikawa, Akihiro Tamura, Yasuko Terada, Kentaro Uesugi, Akihisa Takeuchi, Shoji Arai, Chima Tanaka, Yohei Igami, Katsuhiko Suzuki, Tetsu Kogiso,