KARAKTERISTIK SEDIMEN PALUNG LAUT SULAWESI (CORE STA12) BERDASARKAN HASIL PENGAMATAN MEGASKOPIS DAN SIFAT FISIKA DARI PENGUKURAN MULTI-SENSOR CORE LOGGER (MSCL)

Marfasran Hendrizan; Rina Zuraida; Sri Yudawati Cahyarini

doi:10.14203/risetgeotam2016.v26.273

KARAKTERISTIK SEDIMEN PALUNG LAUT SULAWESI (CORE STA12) BERDASARKAN HASIL PENGAMATAN MEGASKOPIS DAN SIFAT FISIKA DARI PENGUKURAN MULTI-SENSOR CORE LOGGER (MSCL)

Marfasran Hendrizan, Rina Zuraida, Sri Yudawati Cahyarini

Abstract

Karakteristik sedimen yang dikaji pada Core STA12 (120^o06.555’ BT, 02^o00.911’ LU, kedalaman air laut 4820 m) di palung Laut Sulawesi dianalisis menggunakan pengamatan megaskopis dan pengukuran sifat fisika seperti sifat kemagnetan, perubahan warna, cepat rambat gelombang, dan unsur kimia menggunakan Multi-Sensor Core Logger (MSCL). sedimen yang berwarna lebih gelap terletak pada kedalaman 70-100 cm dan 135-195 yang diselingi oleh sedimen berwarna lebih cerah diantara sedimen yang lebih gelap tersebut. Sedimen yang berwarna gelap ini memiliki sifat fisik nilai L* yang rendah, sifat kemagnetan yang cenderung tinggi, rasio normalisasi (K/Ca) yang rendah, dan kecepatan transmisi gelombang P yang tinggi. Keberadaan elemen terrestrial seperti Ti, Fe, K, dan Mn yang cenderung rendah pada sedimen yang berwarna lebih gelap. Namun sedimen yang lebih cerah memiliki karakter sedimen sebaliknya dengan nilai L* yang tinggi, sifat kemagnetan yang cenderung rendah, rasio normalisasi (K/Ca) yang tinggi, dan kecepatan transmisi gelombang yang rendah. Karakteristik sedimen pada core STA12 ini diduga terkait jumlah pasokan input terrestrial dari wilayah Kalimantan atau Filipina. Selain itu, intensitas airlindo yang melewati core STA12 juga kemungkinan mempengaruhi karakteristik sedimen di wilayah ini.

Sediment characteristic was examined in Sulawesi Sea trench, core STA12 (120^o06.555’ E, 02^o00.911’ N, water depth 4820 m). This core was analyzed using megascopic observation and physical properties measurement i.e. magnetic susceptibility, color change, P-Wave velocity, and chemical elements using Multi-Sensor Core Logger (MSCL). The darker sediments located at the depth of 70-100 cm and 135-195 cm was alternated by the brighter sediment in between their darker sediments. The darker sediments posses the physical properties i.e. low L* value, high magnetic susceptibility, low normalized ratio of (K/Ca), and high P-wave velocity. The occurrence of terrestrial elements (Ti, Fe, K, and Mn) indicates low characteristic in the darker sediments. In contrast, the brighter sediments show the physical properties i.e. high L* value, low magnetic susceptibility, high normalized ratio of (K/Ca), and low P-wave velocity as well as higher characteristic of terrestrial elements. The sediment characteristic at core STA12 is supposed due to the amount of terrestrial input from Kalimantan and Philippine. Besides, the Indonesian throughflow (ITF) passed the location core STA12 may influence the sediment characteristic in this area.

Keywords

physical properties, Sulawesi Sea, terrestrial input, Indonesian Throughflow, monsoon, MSCL methods

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DOI: http://dx.doi.org/10.14203/risetgeotam2016.v26.273