TECTONIC AND GEOLOGICAL STRUCTURES OF GUNUNG KROMONG, WEST JAVA, INDONESIA

Authors

  • Iyan Haryanto
  • Nisa Nurul Ilmi
  • Johanes Hutabarat
  • Billy Gumelar Adhiperdana
  • Lili Fauzielly
  • Yoga Andriana Sendjaja
  • Edy Sunardi

Keywords:

Kromong, Fault, Slickenside, Structure

Abstract

The Gunung Kromong complex is a solitary hill which physiographically located within the Jakarta
Coastal Plain Zone. The research is mainly formed of primary data from observations and measurements of all
geological elements especially morphological aspects and geological structures to reveal the tectonic background
and its relation to the oil seepage. Sedimentary rocks outcrops appear in the western part around the cement plant
surrounded by well exposed of igneous rocks. Oil seepage, gas and hot springs are found in limestone which has
high fracture intensity and at low elevation. The distribution of sedimentary rocks is not only controlled by the
folds and fault structures but also influenced by the igneous rock intrusion. The alignment of the structure in West
Palimanan is formed by steep slopes on dacite igneous rock which is concluded as fault scarp. There are found
abundance of fault indications in the form of slickenside, fault breccias, millonites, drag folds and have high
intensity of shear joint. The KRG-7, KRG-8 and KRG-9 observation points, a slickenside with the same plane was
found but has different slicken line, each shows a thrust fault and normal faults. The direction of slickenside
divided into 4 units of fault groups. The series of hills in the south of the Baribis Fault occur because of the lifting
through the fold and the thrust faults mechanism. The thrust fault in the Gunung Kromong complex is the hanging
wall section of the Baribis thrust fault, so that it belongs to the leading thrust system.

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Published

2020-10-30

How to Cite

Iyan Haryanto, Nisa Nurul Ilmi, Johanes Hutabarat, Billy Gumelar Adhiperdana, Lili Fauzielly, Yoga Andriana Sendjaja, & Edy Sunardi. (2020). TECTONIC AND GEOLOGICAL STRUCTURES OF GUNUNG KROMONG, WEST JAVA, INDONESIA. GEOMATE Journal, 19(74), 185–193. Retrieved from https://geomatejournal.com/geomate/article/view/1877

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