REGIONAL GEOLOGY OF KEREK, NGAWI, EAST JAVA PROVINCE

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REGIONAL GEOLOGY OF KEREK, NGAWI, EAST JAVA

PROVINCE

Ryan Damara Pradhana , Yan Rizal , Fadhel

Department of Geological Engineering

Faculty of Earth Science and Technology

Institute of Technology Bandung

Abstract

This research is located in Kerek, Kabupaten Ngawi, East Java. This area is located in 7° 22' 00"

LS - 7°24' 30" LS & 111° 27' 30" BT - 111° 29' 30" BT and this area is about 17 km

wide. The

purpose of this research is to make the geological map and determine the geomorphological

units, stratigraphy units, geological structure, and geological history of Kerek. The method of

this research is study of the literature, field observation, and laboratory experiment.

Geomorphology of research area is divided into fold hills unit, homoclinal hills unit, and railroad

river unit. Stratigraphy of research area is divided into 8 units, that is sandstone-tuff unit that

deposited on Late Miocene, tuff I unit that deposited on Early Pliocene, marl unit that deposited

on Early Pliocene, limestone unit that deposited on Early Pliocene, tuff II unit that deposited on

Early Pliocene, breccia unit that deposited on Late Pliocene, railroad river unit that deposited on

Holocene, and alluvial unit that deposited on Holocene. Geological structure that developed in

this area is Kerek reverse fault trending northeast-southwest and Banyuurip transform fault

trending north-south.

Keywords: Kerek, Ngawi, Stratigraphy, Geolomorphology

INTRODUCTION

Kerek is a village located in Ngawi, East

Java Province. Geographically, Kerek is

located on 7

22’ 00” LS – 7

27’ 30” LS

and 111

29’ 30” BT – 111

29’ 30” BT.

This location is about 17km

wide area. The

village adjoining with Bojonegoro on the

north, Sragen on the east and Nganjuk on

the west. The Village is also passed through

by Bengawan Solo river. Almost all of

Kerek’s people come from Java & Madura

and working as a farmer. Kerek is located on

the far north of Ngawi so the village rarely

been the object of geological research.

Because of that, analysis needs to be done to

give information about geological structure,

lithology, and geomorphological unit in

Kerek village. The purpose of this research

is to make the geological map and determine

the geomorphological units, stratigraphy

units, geological structure, and geological

history of Kerek.

METHODOLOGY

This research begins with study of the

literature about regional geology of Kerek.

This study is conducted to get general

information about research area, such as

deployment of rocks, stratigraphic relations

between rocks unit and geological structure

of the area. Next step is field observation.

Field observation is conducted for data

retrieval, such as surface geological

mapping, rock sampling, strike and dip

measurement, structural data measurement,

geomorphological observation, and location

plotting.

After the necessary data has been collected,

laboratory experiment is performed for

micropaleontology analysis and

determination of depositional environment.

Micropaleontology analysis is performed to

determine relative age of the research area.

Besides that, petrographic analysis is also

performed for identification of rock’s

composition and determining unit lithology

of the research area. Structural data analysis

is also performed to analyze the deformation

which has occurred in that area. Next step is

making a map, such as, geomorphological

map, geological map that includes condition

& structure of the research area, and cross

section mapping that includes relative age

analysis of the rocks sample, and

depositional environment. Last step is

making a model of geological history of the

research area.

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REGIONAL GEOLOGY OF KEREK, NGAWI, EAST JAVA PROVINCE Ryan Damara Pradhana , Yan Rizal , Fadhel Department of Geological Engineering Faculty of Earth Science and Technology Institute of Technology Bandung Abstract This research is located in Kerek, Kabupaten Ngawi, East Java. This area is located in 7° 22' 00" LS - 7°24' 30" LS & 111° 27' 30" BT - 111° 29' 30" BT and this area is about 17 km2 wide. The purpose of this research is to make the geological map and determine the geomorphological units, stratigraphy units, geological structure, and geological history of Kerek. The method of this research is study of the literature, field observation, and laboratory experiment. Geomorphology of research area is divided into fold hills unit, homoclinal hills unit, and railroad river unit. Stratigraphy of research area is divided into 8 units, that is sandstone-tuff unit that deposited on Late Miocene, tuff I unit that deposited on Early Pliocene, marl unit that deposited on Early Pliocene, limestone unit that deposited on Early Pliocene, tuff II unit that deposited on Early Pliocene, breccia unit that deposited on Late Pliocene, railroad river unit that deposited on Holocene, and alluvial unit that deposited on Holocene. Geological structure that developed in this area is Kerek reverse fault trending northeast-southwest and Banyuurip transform fault trending north-south. Keywords: Kerek, Ngawi, Stratigraphy, Geolomorphology INTRODUCTION Kerek is a village located in Ngawi, E ...
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