HOLOCENE PALEOENVIRONMENTAL RECONSTRUCTION OF THE SUNDA SHELF , OFF NORTHEASTERN PENINSULAR MALAYSIA
In order to understand Holocene paleoenvironmental evolution of the western Sunda Shelf (southern South China Sea) , two gravity cores TER15-GC10A and TER15-GC9A were collected (2015) 33 and 37 km offshore of Kuala Terengganu (KT) , Peninsular Malaysia at ca. 60 m water depth. The cores were sampled...
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ftunivnorthcag:oai:libres.uncg.edu/29730 2024-02-11T10:08:06+01:00 HOLOCENE PALEOENVIRONMENTAL RECONSTRUCTION OF THE SUNDA SHELF , OFF NORTHEASTERN PENINSULAR MALAYSIA Harrison, Emily I. NC DOCKS at East Carolina University 2017 http://libres.uncg.edu/ir/ecu/f/0000-embargo-holder.txt English eng http://libres.uncg.edu/ir/ecu/f/0000-embargo-holder.txt 2017 ftunivnorthcag 2024-01-27T23:47:14Z In order to understand Holocene paleoenvironmental evolution of the western Sunda Shelf (southern South China Sea) , two gravity cores TER15-GC10A and TER15-GC9A were collected (2015) 33 and 37 km offshore of Kuala Terengganu (KT) , Peninsular Malaysia at ca. 60 m water depth. The cores were sampled every 1 cm and analyzed for three paleoenvironmental proxies; 1) bulk sediment magnetic susceptibility (BMS); 2) elemental analysis by x-ray fluorescence (XRF) spectrometry , and 3) foraminiferal content. Radiocarbon age estimates indicate that cores have a maximum age of ca. 8 , 400 cal. yr BP. BMS values decrease up-core (1.95 x 10-4-1.04 x 10-4 SI). XRF data also indicate a decrease up-core for Al (12.82%-17.05%) , Fe (5.45%-3.65%) , and Ti (0.78%-0.61%) with an inverse relationship to the concentration of Ca (3.29%-7.77%). This is interpreted to reflect a decrease in amount of terrestrial material supplied to the shelf over the last ca. 8 , 400 years , a dilution of detrital material by the local productivity of marine carbonates , and/or a stabilization of sea level. Cluster analysis indicates four groups of benthic foraminifera within the two cores. Within all four clusters Textularia sp. A , Heterolepa dutemplei , Asterorotalia milletti , and Hanzawaia nipponica were the most abundant species. Within three of the four groups , Textularia sp. A was the most abundant. Benthic foraminiferal assemblages , along with the presence of planktonic foraminifera suggest an open inner-shelf marine environment. Within the two cores , three paleoenvironmental episodes were recognized. The first episode occurred from ca. 8 , 400 cal. yr BP to ca. 6 , 500 cal. yr BP and was characterized by relatively high terrigenous input. At the beginning of this episode , sea level was at about -5 m rising to a maximum height of around +5 m by the mid-Holocene highstand (6 , 500 BP). The second episode (6 , 500 cal. yr BP-4 , 000 cal. yr BP) was transitional , from the relatively high influence of terrigenous material to a third episode , ... Other/Unknown Material Planktonic foraminifera University of North Carolina: NC DOCKS (Digital Online Collection of Knowledge and Scholarship) Sunda ENVELOPE(-6.982,-6.982,62.205,62.205) |
institution |
Open Polar |
collection |
University of North Carolina: NC DOCKS (Digital Online Collection of Knowledge and Scholarship) |
op_collection_id |
ftunivnorthcag |
language |
English |
description |
In order to understand Holocene paleoenvironmental evolution of the western Sunda Shelf (southern South China Sea) , two gravity cores TER15-GC10A and TER15-GC9A were collected (2015) 33 and 37 km offshore of Kuala Terengganu (KT) , Peninsular Malaysia at ca. 60 m water depth. The cores were sampled every 1 cm and analyzed for three paleoenvironmental proxies; 1) bulk sediment magnetic susceptibility (BMS); 2) elemental analysis by x-ray fluorescence (XRF) spectrometry , and 3) foraminiferal content. Radiocarbon age estimates indicate that cores have a maximum age of ca. 8 , 400 cal. yr BP. BMS values decrease up-core (1.95 x 10-4-1.04 x 10-4 SI). XRF data also indicate a decrease up-core for Al (12.82%-17.05%) , Fe (5.45%-3.65%) , and Ti (0.78%-0.61%) with an inverse relationship to the concentration of Ca (3.29%-7.77%). This is interpreted to reflect a decrease in amount of terrestrial material supplied to the shelf over the last ca. 8 , 400 years , a dilution of detrital material by the local productivity of marine carbonates , and/or a stabilization of sea level. Cluster analysis indicates four groups of benthic foraminifera within the two cores. Within all four clusters Textularia sp. A , Heterolepa dutemplei , Asterorotalia milletti , and Hanzawaia nipponica were the most abundant species. Within three of the four groups , Textularia sp. A was the most abundant. Benthic foraminiferal assemblages , along with the presence of planktonic foraminifera suggest an open inner-shelf marine environment. Within the two cores , three paleoenvironmental episodes were recognized. The first episode occurred from ca. 8 , 400 cal. yr BP to ca. 6 , 500 cal. yr BP and was characterized by relatively high terrigenous input. At the beginning of this episode , sea level was at about -5 m rising to a maximum height of around +5 m by the mid-Holocene highstand (6 , 500 BP). The second episode (6 , 500 cal. yr BP-4 , 000 cal. yr BP) was transitional , from the relatively high influence of terrigenous material to a third episode , ... |
author |
Harrison, Emily I. NC DOCKS at East Carolina University |
spellingShingle |
Harrison, Emily I. NC DOCKS at East Carolina University HOLOCENE PALEOENVIRONMENTAL RECONSTRUCTION OF THE SUNDA SHELF , OFF NORTHEASTERN PENINSULAR MALAYSIA |
author_facet |
Harrison, Emily I. NC DOCKS at East Carolina University |
author_sort |
Harrison, Emily I. |
title |
HOLOCENE PALEOENVIRONMENTAL RECONSTRUCTION OF THE SUNDA SHELF , OFF NORTHEASTERN PENINSULAR MALAYSIA |
title_short |
HOLOCENE PALEOENVIRONMENTAL RECONSTRUCTION OF THE SUNDA SHELF , OFF NORTHEASTERN PENINSULAR MALAYSIA |
title_full |
HOLOCENE PALEOENVIRONMENTAL RECONSTRUCTION OF THE SUNDA SHELF , OFF NORTHEASTERN PENINSULAR MALAYSIA |
title_fullStr |
HOLOCENE PALEOENVIRONMENTAL RECONSTRUCTION OF THE SUNDA SHELF , OFF NORTHEASTERN PENINSULAR MALAYSIA |
title_full_unstemmed |
HOLOCENE PALEOENVIRONMENTAL RECONSTRUCTION OF THE SUNDA SHELF , OFF NORTHEASTERN PENINSULAR MALAYSIA |
title_sort |
holocene paleoenvironmental reconstruction of the sunda shelf , off northeastern peninsular malaysia |
publishDate |
2017 |
url |
http://libres.uncg.edu/ir/ecu/f/0000-embargo-holder.txt |
long_lat |
ENVELOPE(-6.982,-6.982,62.205,62.205) |
geographic |
Sunda |
geographic_facet |
Sunda |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
http://libres.uncg.edu/ir/ecu/f/0000-embargo-holder.txt |
_version_ |
1790607057962926080 |