The Morphotectono-Volcanic of Menoreh-Gajah-Ijo Volcanic Rock In Western Side of Yogyakarta-Indonesia

Abstract

Menoreh-Gajah-Ijo have a very distinctive shape, where there are form of circular structure of volcano that is still intact and the other has not been intact. These morphologies are the morphology of the remaining volcanoes formed by tectonics and certain volcanisms. This study was conducted through a series of interpretations of volcanic body distribution, constructing a Slope Map, constructing a Slope Direction Map, constructing an alignment interpretation on satellite imagery and field mapping work. The formation of Menoreh-Gajah-Ijo morphologies are strongly influenced by tectonics and volcanic processes. The process of tectonism that produces the strike-slip fault structures, the normal faults, and the uplift have formed the lineaments of the valleys and hills with various directions patterns. The Menoreh-Gajah-Ijo volcanisms that have occurred form the structure of volcanic remains. Distribution of Menoreh-Gajah-Ijo volcanic rocks form some semicircle structures because of the normal fault structure that has occurred.

The Comparative of Morphological and Gravity Anomaly Lineaments in West Progo Mountains, Indonesia The Comparative of Morphological and Gravity Anomaly Lineaments in West Progo Mountains, Indonesia

“…The West Progo Mountains are composed of several formations, such as Nanggulan Formation, Old-Andesite Formation, Jonggrangan Formation, and Sentolo Formation. The age of Nanggulan Formation is the Middle Eocene-Oligocene [2], the Old-Andesite Formation is the Late Oligocene-Middle Miocene [3], the Jonggrangan Formation is the Early Miocene-Middle Miocene, and the Sentolo Formation is the Early Miocene-Pliocene [2]. Nanggulan Formation exposed to the surface by the presence of a thrust fault [2], [3].…”

“…The age of Nanggulan Formation is the Middle Eocene-Oligocene [2], the Old-Andesite Formation is the Late Oligocene-Middle Miocene [3], the Jonggrangan Formation is the Early Miocene-Middle Miocene, and the Sentolo Formation is the Early Miocene-Pliocene [2]. Nanggulan Formation exposed to the surface by the presence of a thrust fault [2], [3]. This formation consists of sandstone, quartz sandstone, calcareous claystone, interbedded with claystonelignite [3].…”

A Desktop Study to Determine Mineralization Using Lineament Density Analysis at Kulon Progo Mountains, Yogyakarta and Central Java Province, Indonesia

“…There have been numerous studies focusing on the geologic features of Kulon Progo Mountain and its surrounding areas, e.g., regional geology (Rahardjo et al, 1995), tectonic configuration (Syafri et al, 2013;Widagdo et al, 2018), geodynamics and magmatism (Smyth et al, 2008;Maryono et al, 2012), lithology and volcanoes (Harjanto, 2011;Bronto, 2013), and the presence of alteration-mineralization (Harjanto et al, 2006, 2009, Idrus et al, 2013, 2014Pramumijoyo et al, 2017;Prasetyo et al, 2017;Pambudi et al, 2018). Furthermore, research related to precious metal mineralization in Kulon Progo has been carried out in several regions, namely Kokap (Kulon Progo Regency), Bagelen (Purworejo Regency), and Menoreh (Magelang Regency), and revealed the presence of hydrothermal systems.…”

“…The geological structure of the Paleogene-aged rocks, especially in the east of Kulon Progo region, appears to form a parallelogram pattern-i.e., a combination of the W-E and N-S structures that make up the Yogyakarta-Bantul Graben (Barianto et al, 2010). The S-NW to S-NE structures (Syafri et al, 2013) and the SE-NW structure Gadjah Mountain (Widagdo et al, 2018) control the domain of the tectonic patterns in Kulon Progo. In Menoreh Mountain, there is a W-E orientation that partly controls the direction of the morphology in the northern part of the area.…”

Correlation Between Fracture Azimuth, Surface Lineaments and Regional Tectonics: A case study from Belik District, Central Java, Indonesia

“…It is also considered to be intensively affected by tectonics (Widagdo, et al, 2018). On the other hand, the condition of the outcrop is sometimes highly affected by weathering and erosion which make the tectonic features difficult to be observed.…”