The known occurences are almost located in the Barisan Mountain area. Most deposit are hosted in Tertiary volcanics and are considered to be late in Tertiary in age A number of areas contain gold mineralization in quartz stringers in pre Tertiary metamorphic rocks. The older gold deposits tend to be more common in the northern part of Sumatera where placer are also more c…
Maksud dan tujuan penyelidikan adalah untuk menginventarisasi data-data awal seperti luas sebaran, ketebalan, bentuk geometris endapan gambut serta hal-hal lain yang terkait dengannya antara lain karakteristik gambut serta kemungkinan pemanfaatan gambut di daerah ini. Dari basil penyelidikan ini diharapkan dapat diketahui strategi pengembangan selanjutnya misalnya rencana eksplora…
Batuan fosfat a/am (natural rock phosphate) di daerah Pamarican terdapat berasosiasi dengan batuan karbonat berumur Miosen Tengah. Endapan fosfat di sini dijumpai mengisi rekahan dan rongga pada batugamping terumbu, atau sebagai batugamping fosfatan (phosphatic limestone). Cadangan keseluruhan keduajenis batuanfosfat tersebut ditaksir sekitar tiga juta ton. Genesis endap…
A notable feature of such deposts in eugeosynclinal rocks, is the spatial associati• on of auriferous deposits and those of the polymetallic sulphides ores although the deposits themselves occur at different stratigraphic levels. Such associations are exem• plified in the Archaean of Canada. Furthermore gold is often a by-product of the polymetallic sulphide ores and sul…
Sesar utama Sumatera terletak kurang lebih 30 km kearah baratdaya, dan termasuk ke dalam Lembar peta Kotaagung. Sedangkan untuk Lembar Menggala dan Tanjungkarang, berdasarkan (Andi Mangga .,dkk 1993), dilewati beberapa sesar yang arahnya relatif sejajar dengan arah sesar utama Sumatera dan salah satunya dinamakan sesar Kalianda (Firman Noorsaga., 1983) yang dimulai dari se…
Sebaran satuan batuan utama di Lem bar Bengkulu yang diperlihakan pada peta geologi yang disederhanakan (McCourt, 1993) dibuat untuk membantu pencirian contoh - contoh geokimia kedalam bebera- pa grup litologi yang berbeda, didasarkan pada peta geologi sekala 1 : 250.000 Lembar Bengkulu (Gafoer, dkk., 1992). Lembar ini didominasi oleh 2 litologi yaitu batuan gunun…
The question first considered by Wegener concerning the nature of the processes in the Earth bringing about continental drift and sea-floor spreading (or major displacements of the litosphere) in the last 100-200 myr, is probably the most important one in geoscience at the present time. The concept of plate tectonics has integrated the evidence for continental drift, sea-floor spreading and glo…
This , My Latest Book, is another experiment. After sixty years of volcanoes I have learned reversal of preconceived notions. Gradually I have learned a totally different approach. Shaler of Harvard was my inspirer, worker in the wonder of swamp and ice and sea beaches.
With the threat of depletion of conventional sources of energy there has been increased interest in harnessing geothermal energy for man’s use in many countries. However, there as comparatively few people with wide experience in the science and technology of developing this new energy resources.
The current energy crisis has generated an increased interest in alternate source of energy. Resources such as geothermal, solar, and ocean thermal are being actively considered for wide-spread development in the United States and many other countries throughout the world.