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Surono Martosuwito
Pusat Survei Geologi
Chemistry Earth & Planetary Sciences Energy

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SEDIMEN PASANG-SURUT DI KALI KERUH, DESA LOR AGUNG,KABUPATEN PEKALONGAN Surono Martosuwito; Rachmat Fakhruddin
Jurnal Geologi dan Sumberdaya Mineral Vol. 15 No. 1 (2014): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v15i1.69

Abstract

Singkapan sedimen yang diukur di Kali Keruh mempunyai ketebalan 194 m. Batuannya penyusunnya terdiri atas batulumpur, batulempung, napal dan batulanau; dengan sisipian batupasir. Singkapan itu merupakan endapan pasang-surut, yang lingkungannya berubah-ubah dari zona pasir sampai zona lumpur. Perubahan lingkungan itu mungkin disebabkan oleh tektonik lokal. Batuan penyusun singkapan itu dan lingkungan pengendapannya sama dengan Formasi Merawu, namun mempunyai perbedaan umur. Analisa Foraminifera contoh batuan dari singkapan itu menghasilkan umur N17 – N19 atau akhir Miosen Akhir – akhir Pliosen Awal, sedangkan Formasi Merawu berumur N4 – N13 atau Miosen Awal – Miosen Tengah.Kata kunci: pasang-surut, zona lumpur, Formasi Merawu dan Kali Keruh.
TECTONOSTRATIGRAPHY OF THE EASTERN PART OF SULAWESI,INDONESIA. IN RELATION TO THE TERRANE ORIGINS Surono Martosuwito
Jurnal Geologi dan Sumberdaya Mineral Vol. 22 No. 4 (2012): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v22i4.119

Abstract

Geologically the eastern part of Sulawesi is the one of the most complex area in Indonesia. It is formed by two difference composition and origin terranes: ophiolite complex and its pelagic sediment cover and continental terranes, both covered by Sulawesi molasse. The ophiolite and pelagic sedimentary cover had been thrusted over the continental terranes during Late Oligocene-Middle Miocene. After the collision, the Sulawesi molasse was unconformably deposited. The ophiolite was formed in a mid-oceanic ridge, within the Pacific Plate. The continental terranes, in the other hand, were originated from the northern margin of the Australian Continent.Key words: Continental fragment, ophiolite, terrane, and origin
Co-Authors Rachmat Fakhruddin