PROVENANS DAN PELAPUKAN SEDIMEN DASAR LAUT PULAU SALAHNAMO DAN PULAU PANDANG, SUMATRA UTARA: ANALISIS MINERALOGI DAN GEOKIMIA

Eko Saputro, S.T., M.T., Ali Albab, Muhammad Zulfikar, Faris Nauval Rasyid, Riza Rahardiawan

Abstract


Studi ini menyelidiki asal usul dan proses pelapukan purba pada sedimen dasar laut di sekitar Pulau Salahnamo dan Pulau Pandang berdasarkan analisis data mineralogi dan geokimia. Sedimen di wilayah ini dicirikan oleh pasir halus hingga sedang, dengan komposisi mineral yang didominasi oleh kuarsa, K-feldspar, plagioklas, muskovit, biotit, fragmen litik vulkanik, dan mineral lempung. Analisis unsur utama dan unsur jejak menunjukkan bahwa sedimen tersebut berasal dari batuan felsik hingga mafik. Indeks pelapukan yang meliputi Indeks Alterasi Kimia, Indeks Alterasi Plagioklas, Indeks Pelapukan Kimia, dan Indeks Variasi Komposisi, secara konsisten mengindikasikan tingkat pelapukan kimia yang rendah di daerah sumber, serta kematangan sedimen yang belum berkembang.


Keywords


Sedimen dasar laut, geokimia, mineralogi, Pulau Salahnamo, Pulau Pandang, Tanjung Tiram

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DOI: http://dx.doi.org/10.32693/jgk.23.2.2025.948