Optical Dating of Holocene Sediments from the Yangtze River (Changjiang) Delta, China PDF Download
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Languages : en
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Author: Jian Liu
Publisher: Frontiers Media SA
ISBN: 2832546161
Category : Science
Languages : en
Pages : 142
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The Yangtze River (Changjiang) and the Red River (Song Hong) that originate in highlands of the Himalayas and Tibetan Plateau, two of the largest rivers in East and Southeast Asia in terms of water and sediment discharge into oceans, play a pivotal role in the global biogeochemical cycle. The Yangtze River Delta is located at the west coast of the East China Sea and the Red River delta at the west coast of the Gulf of Tonkin in the South China Sea. Both were initiated during the early to middle Holocene.
Author: Shuwen Zhang
Publisher: Frontiers Media SA
ISBN: 2832520634
Category : Science
Languages : en
Pages : 198
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Author: Liangcheng Tan
Publisher: Frontiers Media SA
ISBN: 2889664716
Category : Science
Languages : en
Pages : 206
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Author: Ruochen Wang
Publisher: Open Dissertation Press
ISBN: 9781361014561
Category : Science
Languages : en
Pages : 132
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This dissertation, "Optical Dating of Young Lacustrine Sediment From Manas Lake in Northwestern China" by Ruochen, Wang, 王若辰, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Manas Lake is a closed and dried lake in Junggar Basin with catchment area of 11,000 square kilometers. The lake is particularly sensitive and important to the study of paleo‐climate changes, because the climate in the catchment area is dominantly influenced by the Westlies. Dating of lake paleo-shorelines and lacustrine sediments can provide chronological evidence of water level and climate changes. No evidence for Holocene high lake level was found by previous studies. The ages of samples were determined using Optical Stimulated Luminescence methodologies. Slope method was used for the determination of equivalent dose of quartz. Series of Lx and Tx from a number of aliquots for each regenerative dose are analyzed to obtain an averaged slop value of the Lx/Tx, by separately fitting Lx-Tx plots under each regenerative dose. In this thesis, slope method was tested for a series of young lacustrine sediment. It is found that using the slope method can save 40% time of conventional SAR procedure. The errors were reduced with large number of natural aliquots. This approach can effectively improve the reliability of optical dating. It is preferred for dating of young samples, because of weak signals and poor precision. Fifteen lacustrine sediments and shoreline deposits were dated. These samples were from a borehole, a profile section and shoreline deposits of the latest high lake level. High-resolution data were achieved by using slope method of OSL signals from quartz for the lacustrine sediments. Magnetic susceptibility of these samples was measured as a proxy for revealing paleo-climate changes. The OSL ages suggested that the lake had experienced a rapid deposition process during 200 600 years ago. Such ages agreed well with the ages of last high lake level, which was the age of little ice age. It is concluded that the paleo-climate of Lake Manas was cold and wet during the little ice age. Sedimentation gaps with age gap of 70ka were found between sediments of little ice age and sediments beneath, from both the lacustrine borehole and paleo‐shorelines. It implies that Lake Manas probably drained for a considerable time. DOI: 10.5353/th_b5334850 Subjects: Lake sediments - China, Northwest Paleolimnology - Holocene
Author: Marilza Rudge
Publisher: Frontiers Media SA
ISBN: 2832514529
Category : Medical
Languages : en
Pages : 188
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Category : Chemistry
Languages : en
Pages : 2692
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Author: Thomas Bianchi
Publisher: Cambridge University Press
ISBN: 1107022576
Category : Science
Languages : en
Pages : 673
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Book Description
A comprehensive, state-of-the-art synthesis of biogeochemical dynamics and the impact of human alterations at major river-coastal interfaces for advanced students and researchers.
Author: Richard A. Davis Jr.
Publisher: Springer Science & Business Media
ISBN: 9400701233
Category : Science
Languages : en
Pages : 622
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Book Description
This book presents a comprehensive, contemporary review of tidal environments and deposits. Individual chapters, each written by world-class experts, cover the full spectrum of coastal, shallow-marine and even deep-marine settings where tidal action influences or controls sediment movement and deposition. Both siliciclastic and carbonate deposits are covered. Various chapters examine the dynamics of sediment transport by tides, and the morphodynamics of tidal systems. Several chapters explore the occurrence of tidal deposits in the stratigraphic context of entire sedimentary basins. This book is essential reading for both coastal geologists and managers, and geologists interested in extracting hydrocarbons from complex tidal successions.
Author: H.H.G. Savenije
Publisher: Gulf Professional Publishing
ISBN: 9780444521088
Category : Science
Languages : en
Pages : 222
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Book Description
"This book is a valuable theoretical resource for graduate students specialising in estuary processes and for researchers in related disciplines. It is also a useful guide for practitioners and consultants with its wide range of analytical equations, describing hydraulic, mixing and salt intrusion processes in estuaries."--Jacket.
