GEOLOGI DAN STUDI DIAGENESIS BATUGAMPING FORMASI BEBULU DAERAH LONGKALI DAN SEKITARNYA, KECAMATAN LONGKALI, KABUPATEN PASER, PROVINSI KALIMANTAN TIMUR
Research is held in Longkali and surrounding area, Paser Districts, East Borneo Province. Geological mapping is conducted in an area of 49 kilometers2 to the scale of 1:12.500 in order to figure the geological setting in the research area. In addition, a diagenetic study of Bebulu Limestone Forma...
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| Format: | Final Project |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/34255 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Research is held in Longkali and surrounding area, Paser Districts, East Borneo
Province. Geological mapping is conducted in an area of 49 kilometers2 to the scale of
1:12.500 in order to figure the geological setting in the research area. In addition, a
diagenetic study of Bebulu Limestone Formation is also conducted by doing a set of
analysis from analyzing its diagenetic products until reconstructing its diagenetic
history.
Research area landscape shows differential in terms of contour pattern and
morphological surface. As a result, research area is classified into three
geomorphologic unit which are Karst Hill Unit, Folded Hills Unit, and Plain Karst
Unit. Geological history of research area begins in Middle Miocene when the
Sandstone Unit deposition, followed by the deposition of Limestone Unit in which has
an inter-fingering relationship with the Sandstone Unit. In conjunction with the
limestone deposition, there is also Sandstone-Claystone A Unit deposition which takes
until Late Miocene. Afterwards, Sandstone-Claystone B Unit is deposited conformed
above the Limestone Unit and Sandstone-Claystone A Unit. Tectonic activity takes
time in Pliocene, generating fold and fault in the research area which then observed as
a tear fault.
Diagenetic process which is observed in Bebulu Formation are shown within
the limestone reefs and limestone clasts. Diagenetic products that are recorded in the
Limestone has a cross-cutting relationship therefore the history and change of
diagenetic environment can be concluded sequentially. In short, diagenetic in Bebulu
Formation starts with marine phreatic, followed by meteoric phreatic and meteoric
vadose, continued with burial, and at last meteoric vadose. |
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