PENGARUH PENGANGKATAN DAN PERUBAHAN POLA SEDIMENTASI TERHADAP SEBARAN PASIR BESI DI PESISIR DAN PERAIRAN PANTAI BAGIAN BARAT PULAU TALAUD SULAWESI UTARA

Hananto Kurnio, Moch. Akrom Mustafa, Udaya Kamiludin

DOI: http://dx.doi.org/10.32693/jgk.13.2.2015.262

Abstract


Hasil penelitian sumber daya pasir besi di pesisir barat Pulau Talaud, menyimpulkan bahwa sebarannya sebagian dikontrol oleh proses tektonik aktif yang berlangsung sekarang berupa pengangkatan yang mengakibatkan perubahan pola sedimentasi. Proses tektonik ini mengakibatkan terangkatnya bagian barat Pulau Talaud, yang ditunjukkan oleh terdapatnya terumbu-terumbu karang yang mati. Peristiwa ini berhubungan dengan gempabumi di laut sebelah barat pulau yang terjadi pada tahun 2009 dengan magnitude 7,2 sekala Richter, kedalaman episenter kurang dari 35 kilometer. Proses pengangkatan ini, sekitar 1 meter berdasarkan informasi penduduk setempat, mengakibatkan terjadinya fenomena re-distribusi endapan pasir besi. Pasir besi di pesisir tersebar ke arah laut membentuk dangkalan-dangkalan (shoals), yang tampak jelas pada saat air laut surut.

Kata kunci pengangkatan, perubahan pola sedimentasi, pasir besi, Perairan Pulau Talaud


Results of research on iron sand resource in coastal zone of Talaud Island concluded that its distribution is partly controlled by active tectonic process which took the form of uplifting and changing of sedimentation pattern. This tectonic process was causing uplifting of western side of Talaud Island, which is shown by mortality of coral reefs. This event was related to a 2009's earthquake of 7.2 Richter scale which was located at the sea west of the island, epicenter depth less than 35 kilometers. The uplifting process, approximately 1 meter based on local residence information, generates phenomenon of redistribution of iron sand deposit. The iron sand is distributed toward sea forming shoals, which is clearly could be seen during low tide.

Keywords: uplift, sedimentation pattern change, iron sand, Talaud Island Waters


Keywords


pengangkatan;perubahan pola sedimentasi;pasir besi;Perairan Pulau Talaud

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DOI: http://dx.doi.org/10.32693/jgk.13.2.2015.262

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