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A Late Holocene Sedimentary Analysis...

McKay, Erin.

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A Late Holocene Sedimentary Analysis of a Shallow Marine Environment in Ha Long Bay, Vietnam.

Record Type:	Electronic resources : Monograph/item
Title/Author:	A Late Holocene Sedimentary Analysis of a Shallow Marine Environment in Ha Long Bay, Vietnam./
Author:	McKay, Erin.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
Description:	94 p.
Notes:	Source: Masters Abstracts International, Volume: 82-01.
Contained By:	Masters Abstracts International82-01.
Subject:	Environmental science. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27963607
ISBN:	9798607388782

A Late Holocene Sedimentary Analysis of a Shallow Marine Environment in Ha Long Bay, Vietnam.
McKay, Erin.

A Late Holocene Sedimentary Analysis of a Shallow Marine Environment in Ha Long Bay, Vietnam. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 94 p.

Source: Masters Abstracts International, Volume: 82-01.

Thesis (M.S.)--University of Colorado at Denver, 2020.

This item must not be sold to any third party vendors.

This thesis examines the last ~3000 years of sedimentological change from a shallow marine environment in Ha Long Bay, northern Vietnam. Two sediment cores from karst island coves, Vin Tung Gao (VTG) and Hang Trai (HT), were collected in December 2015. Geochemical changes, including terrigenous influx through magnetic susceptibility measurements, elemental changes through x-ray fluorescence analysis, and organic and carbonate content through loss-on-ignition estimates, are compared with independent climate and archaeological information to examine potential regional climate and human impacts on the sedimentary environment. Data collected in this thesis are compared with foraminiferal relative density collected on the same cores and reported in Jeremy McClung's thesis. Of specific interest are sedimentological changes occurring during globally significant climate events, such as the Medieval Climate Anomaly (MCA) and Little Ice Age (LIA). Declining solar radiation and a weakened monsoon system between ~3000-1000 cal yr BP correspond with lower terrigenous influx, sediment carbonate, oxygen levels, and correspond in time with decreasing monsoon intensity based on independent climate data. Through the MCA, pulses in organic content, sediment carbonate, and foraminiferal relative density may be a response to an increase in sea surface temperatures (SST). However, following the MCA sediment carbonate percentages at VTG begin to decline unexpectedly through the remaining record. Additionally, detection of heavy metals (Co and Ni) at each location are a product of flourishing societies (more so at HT) during favorable climatic conditions during the late MCA. The MCA to LIA transition (700-400 cal yr BP) is globally marked as arid, which is reflected in little allochthonous input (Fe/Ti), likely from a weakening of the monsoon system. More anoxic conditions are observed at each location, likely emphasizing the surge in biological activity from increasing SST. Increased precipitation during the LIA likely contributed to elevated magnetic susceptibility values at both locations from increased runoff or from the onset of human activity. Furthermore, responses in biological activity decreased at each location, supporting cooler SST, while increased precipitation likely influenced sediment carbonate influx, but only at HT. Magnetic susceptibility and heavy metal content continue to increase, while Mn/Ti ratios decline through the Modern Period (150--65 cal yr BP) at the sites, suggesting climate is not the sole driver in environmental change. This study highlights multiple, sometimes interacting, factors influencing environmental changes in Ha Long Bay, Vietnam and future studies could be designed to examine each drivers relative impact.

ISBN: 9798607388782Subjects--Topical Terms:

677245
Environmental science.
Subjects--Index Terms:

Ha Long Bay

A Late Holocene Sedimentary Analysis of a Shallow Marine Environment in Ha Long Bay, Vietnam.
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500 $a Source: Masters Abstracts International, Volume: 82-01.
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520 $a This thesis examines the last ~3000 years of sedimentological change from a shallow marine environment in Ha Long Bay, northern Vietnam. Two sediment cores from karst island coves, Vin Tung Gao (VTG) and Hang Trai (HT), were collected in December 2015. Geochemical changes, including terrigenous influx through magnetic susceptibility measurements, elemental changes through x-ray fluorescence analysis, and organic and carbonate content through loss-on-ignition estimates, are compared with independent climate and archaeological information to examine potential regional climate and human impacts on the sedimentary environment. Data collected in this thesis are compared with foraminiferal relative density collected on the same cores and reported in Jeremy McClung's thesis. Of specific interest are sedimentological changes occurring during globally significant climate events, such as the Medieval Climate Anomaly (MCA) and Little Ice Age (LIA). Declining solar radiation and a weakened monsoon system between ~3000-1000 cal yr BP correspond with lower terrigenous influx, sediment carbonate, oxygen levels, and correspond in time with decreasing monsoon intensity based on independent climate data. Through the MCA, pulses in organic content, sediment carbonate, and foraminiferal relative density may be a response to an increase in sea surface temperatures (SST). However, following the MCA sediment carbonate percentages at VTG begin to decline unexpectedly through the remaining record. Additionally, detection of heavy metals (Co and Ni) at each location are a product of flourishing societies (more so at HT) during favorable climatic conditions during the late MCA. The MCA to LIA transition (700-400 cal yr BP) is globally marked as arid, which is reflected in little allochthonous input (Fe/Ti), likely from a weakening of the monsoon system. More anoxic conditions are observed at each location, likely emphasizing the surge in biological activity from increasing SST. Increased precipitation during the LIA likely contributed to elevated magnetic susceptibility values at both locations from increased runoff or from the onset of human activity. Furthermore, responses in biological activity decreased at each location, supporting cooler SST, while increased precipitation likely influenced sediment carbonate influx, but only at HT. Magnetic susceptibility and heavy metal content continue to increase, while Mn/Ti ratios decline through the Modern Period (150--65 cal yr BP) at the sites, suggesting climate is not the sole driver in environmental change. This study highlights multiple, sometimes interacting, factors influencing environmental changes in Ha Long Bay, Vietnam and future studies could be designed to examine each drivers relative impact.
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