Electronic Theses and Dissertation

Penelitian ini bertujuan untuk mengidentifikasi lapisan sedimen paleotsunami di daerah seubadeh aceh selatan dengan cara mengkaji sifat fisik lapisan sedimen paleotsunami dan mendeteksi unsur atau unsur kimia pada sampel lapisan paleotsunami berdasarkan plasma libs dan sinyal spektrum sampel. lebih lanjut, penelitian ini diharapkan dapat mempelajari dan mengkaji studi geokimia endapan paleotsunami untuk mempelajari perulangan tsunami. pada metode ini, sinar laser nd-yag sebagai sumber laser difokuskan pada permukaan sampel pelet menggunakan lensa pemfokus hingga menghasilkan plasma. hasil analisis menunjukkan bahwa endapan paleotsunami dan endapan non paleotsunami mengandung unsur garam (ca, mg, na, k, dan li), logam (al, ti, fe, be, ag, si mn, pb, dan ni ), dan unsur organik (c, o, dan n). intensitas emisi beberapa unsur kimia pada endapan paleotsunami lebih tinggi dibandingkan dengan intensitas emisi unsur endapan non paleotsunami. berdasarkan perbedaan intensitas emisi unsur kimia endapan paleotsunami dan non paleotsunami, libs dapat mendeteksi unsur kimia secara cepat, simultan, dan efisien.

This study aimed to identify the paleotsunami sediment layers in the Seubadeh area of South Aceh by examining the physical characteristics of the paleotsunami sediment layers and detecting elements or chemical elements in the paleotsunami layer samples based on LIBS plasma and sample spectrum signals. Furthermore, this research is expected to be able to study and examine geochemical studies of paleotsunami deposits to study tsunami recurrence. In this method, the Nd-YAG laser beam as a laser source is focused onto the surface of the pellet sample using a focusing lens to produce plasma. The results of the analysis show that paleotsunami deposits and non-paleotsunami deposits contain elements of salt (Ca, Mg, Na, K, and Li), metals (Al, Ti, Fe, Be, Ag, Si Mn, Pb, and Ni), and organic elements. (C, O, and N). The emission intensity of several chemical elements in paleotsunami deposits is higher than the emission intensity of non-paleotsunami sediment elements. Based on the difference in the emission intensity of chemical elements from paleotsunami and non-paleotsunami deposits, LIBS can detect chemical elements quickly, simultaneously, and efficiently.