IJOG : Indonesian Journal on Geoscience
Vol 1, No 2 (2006)

Perkembangan Geologi pada Kuarter Awal sampai Masa Sejarah di Dataran Yogyakarta

Mulyaningsih, Sri ( Teknik Geologi IST AKRIND, Jln. Kalisahak 28 Yogyakarta)
Sampurno, Sampurno ( Teknik Geologi ITB, Jln. Ganesha 10 Bandung)
Zaim, Yahdi ( Teknik Geologi ITB, Jln. Ganesha 10 Bandung)
Puradimaja, Deny Juanda ( Teknik Geologi ITB, Jln. Ganesha 10 Bandung)
Bronto, Sutikno ( Pusat Survei Geologi, Jln. Diponegoro 57 Bandung)
Siregar, Darwin Alijasa ( Pusat Survei Geologi, Jln. Diponegoro 57 Bandung)

Article Info

Publish Date
23 Jun 2014


http://dx.doi.org/10.17014/ijog.vol1no2.20065The uplift of Southern Mountains in Early Pleistocene has formed the Yogyakarta Basin. In this basin, the Merapi volcanic activity has been developing. Based on 14C dating in cinder deposits exposed at Cepogo, the volcanic activity took place since ±42 ka. While on the basis of K/Ar dating in andesitic lava at Bibi Volcano, the activity took place since 0.67 ma. The high in the south and the appearance of Merapi volcanic dome in the north had caused a fl at valley. The southern part of the valley is bounded by the Southern Mountains and the western part is bounded by the West Progo Mountains. In the present time, the lithology of the areas which are interpreted as a palaeo-valley is composed of black clay deposits. This black clay is a contact between the basement rocks and Merapi volcanic deposits. The black clay deposits exposed in the Progo River (Kasihan) has been developed since ±16.59 to 0.47 ka, while in the Opak River (Watuadeg) 6210 y BP. Younger black clay deposits intersecting with lahars are also exposed at the Winongo River and have an age of 310 y BP. The age data of volcanic stratigraphy shows that Merapi activities had taken place since ±6210 up to ±310 years ago.  

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Journal Info





Earth & Planetary Sciences


The spirit to improve the journal to be more credible is increasing, and in 2012 it invited earth scientists in East and Southeast Asia as well as some western countries to join the journal for the editor positions in the Indonesia Journal of Geology. This is also to realize our present goal to ...