STUDI PENDAHULUAN EVOLUSI CEKUNGAN LAUT DALAM BUSUR BELAKANG DI BAGIAN BARAT PULAU JAWA

Haryadi Permana, Purna Sulastya Putra, Ahmad Fauzi Ismayanto, Iwan Setiawan, Marfasran Hendrizan

Abstract


Cekungan di antara busur yang berada di dalam lingkungan zona cekungan laut dalam busur belakang atau zona kompresi Majalengka – Banyumas terbentuk akibat peregangan pasangan patahan geser Gabon dan Pamanukan-Karangbolong yang berarah baratlaut-tenggara pada Miosen Awal. Salah satu sub-cekungan tersebut adalah Sub cekungan Majenang tempat diendapkan sedimen volkanoklastik berupa endapan arus gravitasi epiklastik dalam suatu kipas bawah laut berumur Miosen Akhir – Pliosen. Endapan tersebut berasal dari batuan yang berasosiasi dengan volkanik busur belakang bersifat kalk alkalin yang tumbuh di dalam zona patahan tersebut atau memisahkan sub-sub cekungan dan sumber lain berasal dari Pegunungan Selatan. Pasangan patahan geser Gabon dan Pamanukan-Karangbolong menjadi tidak aktif setelah berkembangnya patahan regional Bogor – Bandung –Majalengka berarah barat-timur akibat penunjaman normal Lempeng Australia. Studi rinci pola struktur geologi, anomali gayaberat dan kinematika struktur geologi yang berkembang di Zona Majalengka – Banyumas, proses sedimentasi dan stratigrafi endapan arus
gravitasi kipas bawah laut, serta hasil analisis petrologi dan kimia batuan piroklastik dan epiklastik di dalam zona ini memberikan bukti kuat terbentuknya suatu sub-sub cekungan di antara busur di wilayah cekungan laut dalam busur belakang pada saat Miosen Akhir di bagian barat Pulau Jawa.

Keywords


cekungan di antara busur, cekungan laut dalam, peregangan, endapan arus gravitasi, kipas bawah laut, busur volkanik, kalk alkalin

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