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035 a| (Sirsi) o1097606648;

035 a| (OCoLC)1097606648;

043 a| ao-----;

049 a| EREE;

090 a| QE720.2.S6;

100 1 a| Twarog, Michael R.,e| author.?| UNAUTHORIZED;

245 10 a| Holocene paleoenvironmental reconstruction of depositional environments on the Sunda Shelf, southwest South China Sea, using a multidisciplinary approach /c| by Michael R. Twarog.;

264 1 a| [Greenville, N.C.] :b| [East Carolina University],c| 2018.;

300 a| 116 pages :b| illustrations (some color), maps;

336 a| textb| txt2| rdacontent;

337 a| computerb| c2| rdamedia;

338 a| online resourceb| cr2| rdacarrier;

347 a| text fileb| PDFc| 4.12 MB2| rda;

538 a| System requirements: Adobe Reader.;

538 a| Mode of access: World Wide Web.;

500 a| Presented to the faculty of the Department of Geological Sciences;

500 a| Advisor: Eduardo Leorri;

500 a| Advisor: Stephen Culver;

500 a| Title from PDF t.p. (viewed May 16, 2019).;

502 b| M.S.c| East Carolina Universityd| 2018.;

520 3 a| The last glacial maximum, ca. 21,000 years ago, caused a fall in eustatic sea level of ca. 120 m below present. The low-gradient, shallow Sunda Shelf, Southeast Asia was subaerially exposed during this sea-level lowstand and experienced rising sea level thereafter. Sea level rose to a +1.3--5 m highstand ca. 6,500 cal yr BP, and then fell to modern sea level. The objective of this research is to characterize environmental change on the Sunda Shelf in response to the post-glacial rising eustatic sea level. To address this objective, six gravity cores were collected along a transect crossing the paleo-Chao Phraya incised river valley complex between peninsular Malaysia and southern Vietnam. Thirteen AMS radiocarbon samples, 130 bulk sediment magnetic susceptibility samples (BMS), 66 X-ray fluorescence spectrometry (XRF) samples, and 54 samples for the analysis of foraminiferal assemblages were used to characterize change in the depositional environments of the cored sediments. BMS, XRF, and foraminiferal analysis distinguish two main units. Unit 1 is found in the lower part of the cores and typically contains more terrestrial material than sediments further up-core as shown by higher BMS values, higher % Ti, % Al, % Fe, and lower indicators of marine influence, for example, lower % Ca, % planktonic foraminifera, and percentages of deeper water benthic foraminifera such as Heterolepa dutemplei. Unit 2 is characterized by a significant increase in % Ca, % Heterolepa dutemplei and % planktonic foraminifera ca. 6,500 cal yr BP. Unit 1 is consistent with shallower water depths and is part of a transgressive systems tract (TST, ca. 1 m thick) that terminates ca. 6,500 cal yr BP. Unit 2 represents the overlying highstand systems tract (HST, ca. 1 m thick) and is characterized by an increase in % planktonics, % Ca, and shifts in benthic foraminiferal assemblages, indicating deeper water conditions than the sediments below. This shift from a TST to a HST ca. 6500 cal yr BP is consistent with the Sunda Shelf sea-level record.;

504 a| Includes bibliographical references.;

650 0 a| Paleoecologyz| South China Seay| Holocene.=| ^A43208;

650 0 a| Sedimentation and depositionx| Researchz| South China Sea.=| ^A87027;

650 0 a| Global environmental change.=| ^A384774;

650 0 a| Foraminiferaz| South China Sea.=| ^A47796;

650 0 a| Sea levelz| South China Sea.=| ^A68475;

653 a| sunda shelf;

653 a| paleoenvironmental reconstruction;

653 a| depositional environments;

700 1 a| Leorri, Eduardo,e| degree supervisor.?| UNAUTHORIZED;

700 1 a| Culver, Stephen J.,e| degree supervisor.=| ^A153086;

710 2 a| East Carolina University.b| Department of Geological Sciences.=| ^A1066239;

856 40 z| Access via ScholarShipu| http://hdl.handle.net/10342/7017;

949 o| wjh;

994 a| C0b| ERE;

596 a| 1 4;

998 a| 5091086;

999 a| CLICK ON WEB ADDRESSw| ASISc| 1i| 5091086-1001l| JNETm| JOYNERr| Ys| Yt| JNE3ETDu| 4/18/2019x| ETDz| JERESOURCE;

999 a| CLICK ON WEB ADDRESSw| ASISc| 1i| 5091086-2001l| HSLELECm| HSLr| Ys| Yt| HEETDu| 4/18/2019x| ETDz| HERESOURCE;

Holocene paleoenvironmental reconstruction of depositional environments on the Sunda Shelf, southwest South China Sea, using a multidisciplinary approach / by Michael R. Twarog.

Author/creator	Twarog, Michael R. author.
Other author	Leorri, Eduardo, degree supervisor.
Other author	Culver, Stephen J., degree supervisor.
Other author	East Carolina University. Department of Geological Sciences.
Format	Theses and dissertations
Publication	[Greenville, N.C.] : [East Carolina University], 2018.
Description	116 pages : illustrations (some color), maps
Supplemental Content	Access via ScholarShip
Subjects	Paleoecology--South China Sea. --Holocene. Sedimentation and deposition--Research. --South China Sea. Global environmental change. Foraminifera--South China Sea. Sea level--South China Sea.

Summary	The last glacial maximum, ca. 21,000 years ago, caused a fall in eustatic sea level of ca. 120 m below present. The low-gradient, shallow Sunda Shelf, Southeast Asia was subaerially exposed during this sea-level lowstand and experienced rising sea level thereafter. Sea level rose to a +1.3--5 m highstand ca. 6,500 cal yr BP, and then fell to modern sea level. The objective of this research is to characterize environmental change on the Sunda Shelf in response to the post-glacial rising eustatic sea level. To address this objective, six gravity cores were collected along a transect crossing the paleo-Chao Phraya incised river valley complex between peninsular Malaysia and southern Vietnam. Thirteen AMS radiocarbon samples, 130 bulk sediment magnetic susceptibility samples (BMS), 66 X-ray fluorescence spectrometry (XRF) samples, and 54 samples for the analysis of foraminiferal assemblages were used to characterize change in the depositional environments of the cored sediments. BMS, XRF, and foraminiferal analysis distinguish two main units. Unit 1 is found in the lower part of the cores and typically contains more terrestrial material than sediments further up-core as shown by higher BMS values, higher % Ti, % Al, % Fe, and lower indicators of marine influence, for example, lower % Ca, % planktonic foraminifera, and percentages of deeper water benthic foraminifera such as Heterolepa dutemplei. Unit 2 is characterized by a significant increase in % Ca, % Heterolepa dutemplei and % planktonic foraminifera ca. 6,500 cal yr BP. Unit 1 is consistent with shallower water depths and is part of a transgressive systems tract (TST, ca. 1 m thick) that terminates ca. 6,500 cal yr BP. Unit 2 represents the overlying highstand systems tract (HST, ca. 1 m thick) and is characterized by an increase in % planktonics, % Ca, and shifts in benthic foraminiferal assemblages, indicating deeper water conditions than the sediments below. This shift from a TST to a HST ca. 6500 cal yr BP is consistent with the Sunda Shelf sea-level record.
General note	Presented to the faculty of the Department of Geological Sciences
General note	Advisor: Eduardo Leorri
General note	Advisor: Stephen Culver
General note	Title from PDF t.p. (viewed May 16, 2019).
Dissertation note	M.S. East Carolina University 2018.
Bibliography note	Includes bibliographical references.
Technical details	System requirements: Adobe Reader.
Technical details	Mode of access: World Wide Web.

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Holocene paleoenvironmental reconstruction of depositional environments on the Sunda Shelf, southwest South China Sea, using a multidisciplinary approach / by Michael R. Twarog.

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