عنوان
پدید آورنده
موضوع
رده
کتابخانه
محل استقرار
شماره کتابشناسی ملی
شماره
TLpq303958284
زبان اثر
زبان متن نوشتاري يا گفتاري و مانند آن
انگلیسی
عنوان و نام پديدآور
عنوان اصلي
The determination of the reliability of uranium series dating of enamel, dentine, and bone
نام عام مواد
[Thesis]
نام نخستين پديدآور
C. R. McKinney, Jr.
نام ساير پديدآوران
M. Holdaway
وضعیت نشر و پخش و غیره
نام ناشر، پخش کننده و غيره
Southern Methodist University
تاریخ نشرو بخش و غیره
1991
مشخصات ظاهری
نام خاص و کميت اثر
199
یادداشتهای مربوط به پایان نامه ها
جزئيات پايان نامه و نوع درجه آن
Ph.D.
کسي که مدرک را اعطا کرده
Southern Methodist University
امتياز متن
1991
یادداشتهای مربوط به خلاصه یا چکیده
متن يادداشت
This research, a detailed study of the Uranium (U) series geochemistry in fossil bones and teeth from three C dated, late Pleistocene spring sites in the central Missouri highland and a stratified Middle Paleolithic locality at Bir Tarfawi, Egypt tests the potential for U-series dating of enamel, dentine, and bone. The Missouri spring environments and the fossils in them are atypical in that they contain unusually high concentrations of U, a feature which simplified the chemical analysis and yielded precise isotope ratio measurements despite the young age of the fossil material. At Bir Tarfawi, the pluvial lake deposits contain middle Paleolithic artifacts and abundant skeletal remains. This area has low U/U activity ratios while U abundances are high. The results demonstrate that when U-series analysis is used systematically absolute dating is possible. Of the materials tested, enamel yields the most consistent results among enamel, dentine, and bone, although multiple analyses are necessary to ensure accuracy. The C and U-series methods give concordant dates for enamel from Trolinger Spring and the upper peat at Jones Spring, but at Boney Spring results are ambiguous while at Bir Tarfawi results are non-concordant. U-series dates on bone are generally younger than the C dates, whereas cementum and dentine lack any consistent pattern. U-series dating of enamel can be applied beyond the limit of C analysis, to build a refined chronology of the last 400 ka. Fission track mapping was used to analyze U concentrations and to determine the U distribution in enamel of different ages from several geochemical environments. Uranium tends to be restricted to the outer edges of the enamel in enamels that are concordant with C dates. Tooth enamel from Bir Tarfawi had greater U dispersion and the U-series dates were not concordant with other methods or the stratigraphy. When the enamel is weathered, however, the uranium content is highest in the alteration zone. The analysis of late Pleistocene and Holocene enamels to establish the period of initial U uptake from the local environment shows that absorption apparently ends between 100 and 1000 years after deposition. It is concluded that early U uptake is the primary mode of U absorption at the Missouri Spring localities and therefore dates from methods such as ESR which depend on the assumption of linear or late U uptake must be revised when the U distribution in enamel is narrowly confined to the outer edge.
موضوع (اسم عام یاعبارت اسمی عام)
موضوع مستند نشده
Archaeology
موضوع مستند نشده
Earth sciences
موضوع مستند نشده
Geochemistry
موضوع مستند نشده
Geochemistry
موضوع مستند نشده
Paleontology
موضوع مستند نشده
Social sciences
نام شخص به منزله سر شناسه - (مسئولیت معنوی درجه اول )
مستند نام اشخاص تاييد نشده
C. R. McKinney, Jr.
مستند نام اشخاص تاييد نشده
M. Holdaway
دسترسی و محل الکترونیکی
نام الکترونيکي
مطالعه متن کتاب وضعیت انتشار
فرمت انتشار
p
اطلاعات رکورد کتابشناسی
نوع ماده
[Thesis]
کد کاربرگه
276903
اطلاعات دسترسی رکورد
سطح دسترسي
a
تكميل شده
Y
