Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 89 for “"Radiocarbon dating"”.
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Rapid extraction of dissolved inorganic carbon from seawater and groundwater samples for radiocarbon dating
… carbon from seawater and groundwater samples for radiocarbon dating. The Rapid Extraction of Dissolved Inorganic Carbon System (REDICS) consists of two subsystems – one for sample introduction, acidification, and carbon dioxide extraction, and one for carbon dioxide quantification and storing. The …
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Growth Characterization of Mesophotic Rhodoliths in the Northern Gulf of Mexico Using Radiocarbon Dating
… mapping. Therefore, we utilized sequential radiocarbon analysis for growth characterization of mesophotic boxwork rhodoliths. Rhodoliths were collected from the Flower Garden Banks National Marine Sanctuary in the northern Gulf of Mexico from one location at 48 – 72 m and another at 200 m, …
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Mapping and Radiocarbon Dating Archaic Period Monuments: La Alberca Structure Complex, Highland Michoacán, Mexico
… as 5000 to 4000 years ago (in calibrated radiocarbon years). These radiocarbon dates fall in sequence and overlap the dates for the burial in the nearby La Alberca Rockshelter (6650 -3985 cal B.P.). The Central Structure as well as above ground Structures 1 and 5 (labeled <em>Yacata</em>) …
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Rapid extraction of dissolved inorganic carbon from seawater and groundwater samples for radiocarbon dating
… carbon from seawater and groundwater samples for radiocarbon dating. The Rapid Extraction of Dissolved Inorganic Carbon System (REDICS) consists of two subsystems - one for sample introduction, acidification, and carbon dioxide extraction, and one for carbon dioxide quantification and storing. The …
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Investigations of temporal changes in climate and the geomagnetic field via high-resolution radiocarbon dating
… with a distinct increase in the atmospheric radiocarbon (14C) concentration, which has been interpreted to be a result of decreased solar activity. Therefore, a solar-induced climate change has been suggested. In addition to changes in solar activity, geomagnetic field records also show …
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The development of a novel and potentially nondestructive pretreatment for the radiocarbon dating of archaeological artifacts
… pretreating archaeological artifacts prior to radiocarbon dating is destructive to most materials, the possibility of developing an alternative pretreatment is important to preserving culturally- and historically-significant artifacts. The alkali step usually involves a 1M or higher …
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Cycad forensics: tracing the origin of poached cycads using stable isotapes, trace element concentrations and radiocarbon dating techniques
… that are already threatened with extinction. Radiocarbon dating in conjunction with stable isotopes and trace element concentrations could provide the essential evidence needed in court when prosecuting poachers and collectors. The aim of this study was to determine the feasibility of using …
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Marine sedimentary organic matter : delineation of marine and terrestrial sources through radiocarbon dating; and the role of organic sulfur in early petroleum generation
… developed technique of isolating and AMS-14C dating individual compounds from complex sedimentary organic mixtures. The samples used in each investigation came from all over the world. The first two chapters utilize ancient marine sediment samples obtained from an outcrop in California (Chpts. …
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Marine sedimentary organic matter: delineation of marine and terrestrial sources through radiocarbon dating; and the role of organic sulfur in early petroleum generation
… developed technique of isolating and AMS-14C dating individual compounds from complex sedimentary organic mixtures. The samples used in each investigation came from all over the world. The first two chapters utilize ancient marine sediment samples obtained from an outcrop in California (Chpts. …
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Identification of changes in the surface of textiles subjected to plasma chemical treatment using attenuated total reflectance-fourier transform infrared spectroscopy
… samples from archaeological materials for radiocarbon dating using accelerator mass spectrometry. However, the chemical effects of low-temperature, low-pressure plasma discharges on fragile archaeological materials are not understood. It is believed that reactions only occur at the surface …
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Human-environmental relations on Bodmin Moor during the Holocene
… areas with chronological control provided by radiocarbon dating. The first area investigated was Rough Tor where five sequences were examined.
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Depositional History of Thousand Acre Marsh From Geophysical and Sedimentological Analyses
<p>Ground Penetrating Radar, radiocarbon dating and core analyses were combined within this investigation to determine the shallow geologic framework and the recent depositional history of Thousand Acre Marsh. Analyses of these data revealed the role of Thousand Acre Marsh as a record keeper of …
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Geology of Aeolian and marine deposits in the Saldanha Bay region, Western Cape, South Africa
… The ages of the deposits were obtained with radiocarbon dating, strontium isotope stratigraphy and biostratigraphy.
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Alternatives to Charcoal for Improving Chronometric Dating of Puget Sound Archaeological Sites
Radiocarbon dating of archaeological sites in the Puget Lowlands can be problematic. Dating specific cultural events associated with features and sites is difficult due to the ubiquity of charcoal in forest soils and poor preservation of bone in acidic soils. These conditions have impeded the …
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Sedentism among the Archaic fisher-folk of northern Chile: A malacological perspective
… further support the oxygen isotope results. Radiocarbon dating revealed that the midden sample spanned the Classic Chinchorro and Transitional Chinchorro epochs, from 5590 to 3830 B. P. Shell classification and quantification of these sites also revealed that shellfish collection and the …
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Sherds With Style: A Ceramic Analysis From A Protohistoric Site In Oktibbeha County, Mississippi.
… Complex using ceramic seriation and radiocarbon dating.
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More than bones. An investigation of life, death and diet in later prehistoric Slovenia and Croatia
… of cremated and non-cremated human remains, radiocarbon dating, stable isotope analysis (carbon, nitrogen, oxygen and strontium) and aDNA analysis has facilitated the exploration and interpretation of later prehistoric social structure and lifestyle. The use of carbon (from enamel carbonate …
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Modern radiocarbon offsets within the land snails Cyclophorus: a tropical karst case study from Northern Vietnam
… reliable interpretation of radiocarbon (14C) dates of terrestrial mollusc shells depends on an understanding of their ecology and behaviour as well as the geology of the area. Since gastropods feed by substrate scraping, they are prone to biased radiocarbon dates as they can …
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Reconstruction of late Holocene vegetation and climate of Hluhluwe Mfolozi area using phytoliths
… area in northeastern KwaZulu-Natal. Radiocarbon dating showed the oldest sediments to be from 23 80 ± 40 BP. Phytoliths are present throughout the record. There was a high degree of unclassifiable phytoliths (>79% per sub-sample), but preliminary trends identified include a dominance …
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