Sains Malaysiana 52(2)(2023): 381-398

http://doi.org/10.17576/jsm-2023-5202-06

Pemendapan Sedimen dan Proses ²¹⁰Pb di Lembangan Melayu dan Selat Melaka

(Sedimentary Deposition and Process of ²¹⁰Pb in Malay Basin and Straits of Malacca)

MOHAMAD ARIF CHE ABD RAHIM¹, SHENGFA LIU^2,3, XUEFA SHI^2,3 & CHE ABD RAHIM MOHAMED^1,*

¹School of Environmental and Natural Resources Science, Faculty of Science & Technology,

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

²Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China

³Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China

Received: 10 April 2022/ Accepted: 14 November 2022

AbstraK

Sebanyak dua teras sedimen diperoleh dari Lembangan Melayu dan Selat Melaka bagi mengenal pasti pemendapan sedimen serta proses ²¹⁰Pb di Lembangan Melayu dan Selat Melaka. Di kawasan kajian, purata aktiviti ²¹⁰Pb adalah sebanyak 111.47 ± 15.01 Bq/kg dan 126.38 ± 16.8 Bq/kg di stesen M17 dan M43 dengan perbezaan antara stesen adalah sebanyak 10%. Kedua-dua stesen menerima input yang berlainan melalui saluran air ke arah kawasan persampelan, menyebabkan peningkatan kandungan ²¹⁰Pb di dalam sedimen. Proses hidrologi yang dikawal melalui perbezaan temporal turut mempengaruhi proses fizikal dan secara tidak langsung, mempengaruhi proses sedimentasi. Proses hidrologi melalui perbezaan temporal yang mempengaruhi proses fizikal dan kemudiannya mempengaruhi kadar proses pemendapan. Memandangkan sistem monsun mempengaruhi daya kitaran hidrologi, mekanisme timbal-balik kesan saiz butiran terhadap ²¹⁰Pb telah berubah berikutan pengaruh arus monsun bersama dengan lempung sebagai pembawa utama yang menonjol untuk teras sedimen, sekali gus mempunyai kesan serta-merta pada pemendapan sedimen. Di samping itu, inventori dan fluks Lembangan Melayu dan Selat Melaka menunjukkan kesan monsun juga menyumbang kepada perubahan inventori dan fluks ²¹⁰Pb di Lembangan Melayu dan Selat Melaka apabila daya kitaran hidrologi mengubah keupayaan kesan penggarutan ²¹⁰Pb di sekitar perantaraan sedimen dan air laut.

Kata kunci: Lembangan Melayu; pemendapan sedimen; proses endapan; Selat Melaka; ²¹⁰Pb

Abstract

A total of two sediment core were acquired from the Malay Basin and the Straits of Malacca to investigate sedimentary deposition and process of ²¹⁰Pb. At the site studied, the average ²¹⁰Pb activity were 111.47 ± 15.01 Bq/kg and 126.38 ± 16.8 Bq/kg at M17 and M43, respectively, with difference of both stations at 10%. Both stations receive a different sediment input from each region which supplies to respective water masses, thus leading to the elevated ²¹⁰Pb concentration in both stations. Hydrological processes through temporal difference affecting the physical processes and later influence the rate of sedimentation processes. Since monsoonal system affecting the motion of hydrological forces, the response of mechanism of grain size effect towards ²¹⁰Pb were altered following monsoonal-induced current in conjunction with clay as prominent carrier for both sediment cores, thus having an immediate effect on the current sedimentary deposition. In addition, inventories and flux of Malay Basin and Straits of Malacca shows the monsoonal effect as main contributor for the several hydrological forces affecting the ²¹⁰Pb along with effective scavenging of ²¹⁰Pb between water-sediment interface thus affecting the total ²¹⁰Pb flux and inventories in sediment core.

Keywords: Malay Basin; sedimentary deposition; sedimentary process; Straits of Malacca; ²¹⁰Pb

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*Corresponding author: email: carmohd@ukm.edu.my