کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4725565 1355990 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dating carbonate rocks with in-situ produced cosmogenic 10Be: Why it often fails
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
Dating carbonate rocks with in-situ produced cosmogenic 10Be: Why it often fails
چکیده انگلیسی

Surface exposure dating of carbonate rocks using cosmogenic 10Be is problematic. We have performed step-wise leaching of calcite-rich samples in order to investigate the reasons for this. Results on different grain size fractions clearly indicate the source of atmospheric 10Be is clay. We demonstrate that partial-leaching procedures, which result in moderate pH levels will not release 10Be (in-situ produced or atmospheric) due to the instant re-absorption on grain surfaces. By contrast, under strongly acidic conditions, all absorbed 10Be is leached from aluminosilicates giving abnormally high 10Be concentrations and consequently exposure ages that are too old. Dating is only possible if samples do not contain any clay minerals or if they can be removed prior to carbonate dissolution.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Quaternary Geochronology - Volume 3, Issue 4, November 2008, Pages 299–307
نویسندگان
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