Dating of speleothems

When two atoms have the same number of protons but a different number of neutrons they are called ISOTOPES.This changes the mass number which is written as a small number in the top left hand corner.Inactive stalagmites from the Silberen cave system and its surroundings (Muota Valley, Central Switzerland) have been dated by the Th/U method (alpha spectrometry and TIMS).Several samples yielded ages of approximately 200 ka (MIS 7) and 320 ka (MIS 9), others were beyond the upper limit of the method (about 350 ka) or might have behaved as open systems with respect to uranium.يقول تعالى: (" ومثل هذه الآيات كانت سبباً في تحفيز علمائنا قديماً لاكتشاف الكثير من العلوم ووضع النظريات وهذا ما ساهم في دفع عجلة العلم ولذلك كان لعلماء المسلمين الفضل في كثير من العلوم، التي أخذها عنهم علماء أوربا واستفادوا منها وقاموا بتطويرها.وفي هذا البحث سوف نرى بأن العلماء قد اكتشفوا بالفعل أن أسرار نشوء الكائنات وبدايات خلق الأرض وتشكلها وتاريخ هذه الأرض، كل ذلك مدوّن بلغة خاصة في صخور الأرض وفي طبقات الجليد وجذوع الأشجار.وهذه الظواهر تدعونا لليقين بلقاء الله تعالى واليقين بصدق كتابه وصدق رسالته، ولذلك قال عز وجل في آية أخرى: (لقد بدأ العلماء رحلة البحث عن بدايات الخلق وذلك عبر الصخور والمتحجرات وفي أعماق البحار وغير ذلك.The same data have been used to fit a hydrogeological model.Uranium-series dates on calcite travertine samples collected from Kartchner Caverns range from ~200-40 Ka.

dating of speleothems-82dating of speleothems-25dating of speleothems-50dating of speleothems-65

Such data together with the U activity ratio and the uranium content of the speleothems have been correlated with the climatic variations connected to the glacial cycles.

This picture shows the different carbon atom isotopes.

The protons and neutrons are clustered in the middle of the atom called the nucleus.

Higher levels were found to be older than the lower ones according to standstills and sinkings of the water table.

The dated speleothems from the first and second level formed less than 10,000 years ago; the minimum ages of the third and fifth levels, which are respectively 130,000 and 200,000 years old, were correlated to climatic events.

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