کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8906909 | 1634664 | 2018 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Luminescence of quartz and feldspar fingerprints provenance and correlates with the source area denudation in the Amazon River basin
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In contrast to the previous studies, we do not observe an increase in the OSL sensitivity of quartz with transport distance; for example, Tapajós and Xingu Rivers show more sensitive quartz than Solimões and Madeira Rivers, even though the latter have a significantly larger catchment area and longer sediment transport distance. Interestingly, high sensitivity quartz is observed in rivers draining relatively stable Central Brazil and Guiana shield areas (denudation rate ξ=0.04 mmyrâ1), while low sensitivity quartz occurs in less stable Andean terrains (ξ=0.24 mmyrâ1). An apparent linear correlation between quartz OSL sensitivity and denudation rate suggests that OSL sensitivity may be used as a proxy for erosion rates in the Amazon basin. Furthermore, luminescence sensitivity measured in sand or silt arises from the same mineral components (quartz and feldspar) and clearly discriminates between Andean and shield sediments, avoiding the grain size bias in provenance analysis. These results have implications for using luminescence sensitivity as a proxy for Andean and shield contributions in the stratigraphic record, providing a new tool to reconstruct past drainage configurations within the Amazon basin.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 492, 15 June 2018, Pages 152-162
Journal: Earth and Planetary Science Letters - Volume 492, 15 June 2018, Pages 152-162
نویسندگان
A.O. Sawakuchi, M. Jain, T.D. Mineli, L. Nogueira, D.J. Jr., C. Häggi, H.O. Sawakuchi, F.N. Pupim, C.H. Grohmann, C.M. Chiessi, M. Zabel, S. Mulitza, C.E.M. Mazoca, D.F. Cunha,