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2015 GSA Annual Meeting in Baltimore, Maryland, USA (1-4 November 2015)

Paper No. 40-26
Presentation Time: 9:00 AM-5:30 PM

BULK SEDIMENT MAGNETIC SUSCEPTIBILITY OF HOLOCENE SEDIMENT IN THE MALACCA STRAIT, OFF NORTHWESTERN PENINSULAR MALAYSIA 


HARRISON, Emily Irene1, CULVER, Stephen J.2, LEORRI, Eduardo2, MALLINSON, David J.2, NOOR, Shazili A.M.3, PARHAM, Peter R.4 and VIJAYAN, V.R5, (1)Geology, East Carolina University, 101 Graham Building, Greenville, NC 27858, (2)Department of Geological Sciences, East Carolina University, Greenville, NC 27858, (3)Institute of Oceanography, Universiti Malaysia Terengganu, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Kuala Terengganu, 000000, Malaysia, (4)Institute of Oceanography and Environment, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu, Malaysia, (5)Minerals and Geoscience Department Malaysia, 31400 Ipoh, Ipoh, 00000, Malaysia, harrisone11@students.ecu.edu

The sea bed of the Malacca Strait off the coast of Kedah, northwestern peninsular Malaysia is characterized by several meters of Holocene mud that potentially preserve a record of Holocene paleoenvironmental/paleoclimatic change. In 2001, a piston core was taken at 15.80 m water depth between Langkawi Island and the Malaysian mainland. The core was comprised almost entirely of sandy mud with comminuted bivalve shell fragments throughout. The core was cut into contiguous samples (averaging 2-3 cm in thickness) and analyzed for bulk sediment magnetic susceptibility (BMS) by means of Kappabridge MFK-A from Advanced Geoscience Instruments Company.

BMS data averaged 9.26E-05 si, and ranged between 4.88E-05 and 1.21E-04 si. The BMS profile reveals three intervals in the core, from 355 cm to 83 cm (Unit 1), a transition zone from 80 cm to 57 cm (Unit 2), and from 55 cm to 0 cm (Unit 3). A decrease in BMS values up-core is interpreted to be due to reduced fine suspended sediment input through time from adjacent rivers (Perlis and Kedah) of mainland Malaysia. Reduced fluvial sediment load results results from decreased monsoonal intensity, decreased rainfall, and decreased continental run-off through time.

Session No. 40--Booth# 276

Paleoclimatology/Paleoceanography (Posters)
Sunday, 1 November 2015: 9:00 AM-5:30 PM
Exhibit Hall (Baltimore Convention Center)
Geological Society of America Abstracts with Programs. Vol. 47, No. 7, p.128
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