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East Java Basin is one of many prolific basins in Indonesia. Surface <br /> <br /> <br /> <br /> <br /> <br /> geological mapping in Bulu and surroundings area, Rembang and Blora District is <br /> <br /> <br /> <br /> <b...
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Format: | Final Project |
Language: | Indonesia |
Online Access: | https://digilib.itb.ac.id/gdl/view/18962 |
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Institution: | Institut Teknologi Bandung |
Language: | Indonesia |
Summary: | East Java Basin is one of many prolific basins in Indonesia. Surface <br />
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geological mapping in Bulu and surroundings area, Rembang and Blora District is <br />
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highly expected can give some additional geological data of that basin. A purpose <br />
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of this research is to understand geological setting and sandstone facies of <br />
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Ngrayong Member, Tawun Formation in research area. <br />
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Research area is divided to 4 geomorphological units, there are <br />
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Kedungrejo Anticlinal Hills, Tlogo Homoclinal Ridge, Pasedan Homoclinal <br />
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Valley, and Sumbermulyo-Kalijeper Flood Plain which have mature geomorphic <br />
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stage. <br />
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Stratigraphy of research area is divided to 5 lithostratigraphy units which <br />
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are deposited in shallow marine environment, and Aluvial Unit. At Early <br />
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Miocene, Limestone-Claystone Unit was deposited in inner neritic-middle neritic <br />
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environment, regression phase was occured at lower part of Middle Miocene <br />
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when Sandstone Unit is deposited conformably in transition-inner neritic <br />
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environment. Transgession phase began at upper part of Middle Miocene when <br />
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Limestone unit is deposited conformably above Sandstone Unit in middle neritic <br />
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environment. Transgression continuous untill Late Miocene when Marl Unit is <br />
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deposited in middle neritic - outter neritic. Then, regression phase was occured at <br />
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Late Miocene – Early Pliocene when Sandstone-Limestone Unit is deposited in <br />
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inner neritic-middle neritic. <br />
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Deformation during Plio-Pleistocene form reverse faults as main <br />
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structures with additional structures are anticline and strike slip faults. Main stress <br />
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trend is north-south with pure shear mechanism. Geomorphic processes after <br />
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deformation untill now form the present morphology and deposit the Aluvial Unit <br />
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unconformably above the older lithostratigraphy units. <br />
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Based on granulometry and lithofacies analyses, facies association of <br />
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Ngrayong Member sandstone, Tawun Formation can be divided into 2 sand types, <br />
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there are beach sand, and wave-zone sand influenced by Wave-Tide Dominated <br />
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Shallow Marine depositional system. |
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