HUBUNGAN KANDUNGAN MINERAL KUARSA DAN MINERAL LAINNYA DENGAN SEDIMEN DASAR LAUT DI KEPULAUAN ARUAH PROVINSI RIAU
Abstract
Secara geologi perairan Selat Malaka, termasuk dalam kawasan granit Sumatera bagian barat sebagai satu rangkaian pulau-pulau timah yang membujur dari daratan Thailand – Malaysia hingga Bangka – Belitung. Berdasarkan hal tersebut maka perairan tersebut kemungkinan kayadengan potensi mineral-mineral letakan yang bernilai ekonomis. Tujuan penulisan paper ini adalah mengetahui hubungan kandungan mineral dengan sedimen dasar laut yang ada di daerah penelitian.
Berdasarkan analisis besar butir, sedimen yang terdapat di dasar laut daerah perairan Kepulauan Aruah adalah: pasir lanauan (zS) Pasir lempungan (cS), lanau pasiran (sZ), Lanau Lempungan (cZ), lempung lanauan (zC) serta lempung (C).
Berdasarkan analisis mineral, mineral di daerah penelitian terdiri dari kuarsa dengan kandungan antara 60 – 80%. Mineral lainnya adalah zirkon, cassiterite, hematit, magnetit, limonit, biotit dan dolomit.
Endapan letakan pada sedimen permukaan dasar laut secara mekanik umumnya terkonsentrasi oleh sungai dan proses laut. Mineral kuarsa dan mineral berat adalah mineral yang merupakan endapan letakan yang berasal dari pelapukan batuan dan tertransport.
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