کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6349294 | 1622149 | 2016 | 76 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Sedimentary PGE signatures in the Late Triassic ejecta deposits from Japan: Implications for the identification of impactor
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The relatively flat CI chondrite-normalized patterns of the least mobile PGEs (Ir, Ru, and Rh) and the Ru/Ir ratio determined by linear regression analysis suggest that a chondritic impactor is the source of the PGE anomalies preserved in claystone samples from the study sections. Although Ru/Ir ratios cannot conclusively distinguish chondrites from iron meteorites, the Cr/Ir ratios of the claystone layers range from 104 to 105, clearly indicating contribution from chondritic materials. The chondritic impactor of the suggested size (3.3-7.8Â km in diameter) implies that a large amount of debris and/or climatically active gasses (e.g., sulfur oxides) would have been released from the impactor, which would have had a marked effect on the environment.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Palaeogeography, Palaeoclimatology, Palaeoecology - Volume 442, 15 January 2016, Pages 36-47
Journal: Palaeogeography, Palaeoclimatology, Palaeoecology - Volume 442, 15 January 2016, Pages 36-47
نویسندگان
Honami Sato, Naoki Shirai, Mitsuru Ebihara, Tetsuji Onoue, Shoichi Kiyokawa,