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All Journal IJOG : Indonesian Journal on Geoscience Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Surono Martosuwito, Surono
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Earth & Planetary Sciences Education Energy Engineering Environmental Science

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TECTONOSTRATIGRAPHY OF THE EASTERN PART OF SULAWESI,INDONESIA. IN RELATION TO THE TERRANE ORIGINS Martosuwito, Surono
Jurnal Geologi dan Sumberdaya Mineral Vol 22, No 4 (2012): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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

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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.
HUBUNGAN LEMBAH SADENG, CEKUNGAN BATURETNO DAN TERAS BENGAWAN SOLO,JAWA BAGIAN TENGAH Martosuwito, Surono; Samodra, Hanang; Sidarto, Sidarto
Jurnal Geologi dan Sumberdaya Mineral Vol 23, No 3 (2013): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Sadeng valley or ancient river of Sadeng had head water at surrounding Giriwoyo, Wonogiri. Baturetno basin spread outs widely at the south of Wonogiri. When the Old Lawu Mountain erupted, the volcanic products flowed and blocked the Solo River caused big flooding that covered the Baturetno basin. At any time the river might cut the volcanic block, big flooding happed in the valley of the Solo River. As the result, floras and faunas which lived in the valley were got dead. In the next flooding their skeleton were transported and deposited at the Solo terrace. Such things were happened many times. Animal fossils and homonids could possibly much more abundance in the older terraces rather than in the younger one.Key words: Sadeng Valley, Beturetno Basin, Bengawan Solo Terraces, relationship
Stratigraphical and Sedimentological Review of the Merawu Formation, Serayu Basin, Central Jawa, Indonesia Martosuwito, Surono; Bachri, Syaiful; Kamal, Zakiyah Ainul
Indonesian Journal on Geoscience Vol 5, No 2 (2018)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (7346.669 KB) | DOI: 10.17014/ijog.5.2.117-128

Abstract

DOI: 10.17014/ijog.5.2.117-128Merawu Formation is widely distributed in the Serayu Basin, Central Jawa, Indonesia. The formation is dominated by fine-grained clastic sediments comprising interbedded mudstone, siltstone, and sandstone. In the field, these outcrops are well exposed and well bedded. Stratigraphically, the Merawu Formation is underlain by the Paleocene Worawari Formation and overlain by the Late Miocene Penyatan Formation. Contacts between the Merawu Formation and the Worawari Formation are always found as fault types. Twelve sections have been done during the field work. Two members were identified within the Merawu Formation (Sandstone and Mudstone Members) in the field, where they interfinger each other. Previously, researchers interpreted the Merawu Formation as a turbidite sequence of deep marine deposits and depicted Early - Middle Miocene in age. However, the interpretation from the present research shows that the Merawu Formation was deposited on a tidal flat environment and has Early Miocene - Pliocene age, based on foraminifers found in some sections.
Co-Authors Hanang Samodra, Hanang Kamal, Zakiyah Ainul Rachmat Fakhruddin, Rachmat Sidarto Sidarto Syaiful Bachri