Study Petrogenesis and Phase of Rock Formation in the Sibaganding Area, Girsang Sipangan Bolon District, Simalungun Regency, North Sumatra Province

DOI

10.2991/978-94-6463-732-8_12How to use a DOI?

Keywords

Magmatism; Petrogenesis; Petrography; Rock characteristics

Abstract

The study site is located in the Sibaganding area of North Sumatra, which has complex geological conditions that form the background for this research. Sumatra is an island topographically oriented from northwest to southeast. The island is in the southwestern part of the Sunda Shelf, south of the Eurasian Plate. This study aims to characterize and determine petrogenesis and analyze the phase sequence of the formation of existing rocks. The research method used megascopic and microscopic analysis of rocks. Petrographically, the types of rocks distributed in the study area are igneous, metamorphic, pyroclastic, and clastic and non-clastic sedimentary rocks. With rock naming in the form of quartz diorite, quartzolite as an intrusion that tends to be rich in silica, hornfels as a result of contact metamorphism, slate formed as a result of regional metamorphism, mylonite as a result of the milonitization process, crystal tuff, vitric tuff which are both a result of volcanic processes and there are limestones, claystone, very fine sandstone to conglomerate stones which all characterize different depositional sedimentation processes. Each rock characterizes the phase of formation that occurred. This sequence illustrates a complex geological history, with metamorphism phases such as basement formation, shallow marine environment phases, milonitization processes, depositional environment transition phases, magmatic activity, and volcanic activity. All of these phases occurred during the pre-Tertiary to Quaternary periods.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Harga Putri Sitohang
AU  - Muhammad Rizqy Septyandy
AU  - Resty Intan Putri
PY  - 2025
DA  - 2025/06/07
TI  - Study Petrogenesis and Phase of Rock Formation in the Sibaganding Area, Girsang Sipangan Bolon District, Simalungun Regency, North Sumatra Province
BT  - Proceedings of the International Conference on Tropical Studies and Its Application (ICTROPS 2024)
PB  - Atlantis Press
SP  - 127
EP  - 140
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-732-8_12
DO  - 10.2991/978-94-6463-732-8_12
ID  - Sitohang2025
ER  -