Haris Muhlisin, Muhammad Alfa Nur Hani, Akmal Nazla Falahi

Rekonstruksi Prospek Endapan Mineralisasi di Kaligesing: Pendekatan Terintegrasi Geologi, Geomagnetik, dan Gravitasi Satelit

Introduction

Rekonstruksi prospek endapan mineralisasi di kaligesing: pendekatan terintegrasi geologi, geomagnetik, dan gravitasi satelit. Rekonstruksi prospek mineralisasi di Kaligesing, Purworejo. Pendekatan terintegrasi geologi, geomagnetik, dan gravitasi satelit untuk identifikasi zona mineral potensial.

Abstract

Kehadiran struktur geologi dan posisinya sebagai fasies pusat pada daerah tengah Pegunungan Menoreh menyebabkan berkembangnya alterasi dan mineralisasi di bagian batuan intrusi andesit. Selain itu daerah fasies pusat/central ini sebagai tempat terbentuknya batuan ubahan epidot-klorit kalsit di sisi barat Gunung Gajah yakni di daerah Kaligesing. Penelitian ini menyelidiki potensi mineralisasi di daerah Kaligesing, Purworejo, Jawa Tengah dengan mengintegrasikan data geofisika gravitasi dan magnetik. Metode gravitasi satelit (GGMPlus) sebagai survei awal dilakukan di area seluas 7x8 km yang mengidentifikasi titik penelitian berdasarkan nilai densitas. Survei geomagnetik yang lebih rinci kemudian dilakukan di plot seluas 3x4 km dengan 248 titik akuisisi yang diukur. Hasil metode gravitasi menunjukkan nilai Anomali Bouguer Lengkap (CBA) berkisar antara 96,9 hingga 128,7 mGal dengan nilai tinggi di bagian barat dan nilai sedang hingga rendah di bagian timur. Variasi ini menunjukkan perbedaan densitas batuan dan potensi kontrol struktural terhadap mineralisasi. Survei geomagnetik mengungkapkan nilai Intensitas Magnetik Total (TMI) berkisar antara -102,7 hingga 584,1 nT dengan daerah bersuseptibilitas tinggi (584,1 hingga 220,3 nT) yang menunjukkan zona-zona yang kaya mineral potensial. Peta Reduce to Pole (RTP) mengungkapkan struktur sesar yang berorientasi utara-selatan dan barat laut-tenggara. Peta filter Total Horizontal Gradien (THG) dan Tilt Angle (TA) menyoroti batas anomali yang menunjukkan sesar-sesar yang mengontrol mineralisasi. Metode geofisika yang terintegrasi dengan data geologi ini secara efektif memetakan struktur-struktur pengendali dan saling menguatkan interpretasi, yang membantu dalam mengidentifikasi zona mineralisasi prospektif.

Review

The paper "Rekonstruksi Prospek Endapan Mineralisasi di Kaligesing: Pendekatan Terintegrasi Geologi, Geomagnetik, dan Gravitasi Satelit" presents a comprehensive investigation into the potential for mineralized deposits in the Kaligesing area, Purworejo, Central Java. This research effectively addresses the complex interplay of geological structures, alteration, and mineralization associated with andesitic intrusions within the Menoreh Mountains. A significant strength of this work lies in its integrated approach, combining regional satellite gravity data (GGMPlus) with detailed ground-based geomagnetics and existing geological understanding. This multi-proxy strategy provides a robust framework for reconstructing and identifying prospective zones, moving beyond single-method interpretations and enhancing the reliability of the findings. The methodology employed by the authors is meticulous, beginning with a broader 7x8 km satellite gravity survey to delineate initial areas of interest based on density variations. This was followed by a more focused 3x4 km geomagnetics survey involving 248 acquisition points. The gravity data revealed Complete Bouguer Anomaly (CBA) values ranging from 96.9 to 128.7 mGal, indicating significant density contrasts and potential structural controls, with higher values observed in the western part of the study area. Complementing this, the Total Magnetic Intensity (TMI) data, ranging from -102.7 to 584.1 nT, successfully highlighted high susceptibility zones (584.1 to 220.3 nT) indicative of potential mineral-rich areas. Further processing through Reduce to Pole (RTP) filtering elucidated prominent north-south and northwest-southeast trending fault structures, while Total Horizontal Gradient (THG) and Tilt Angle (TA) maps effectively delineated anomaly boundaries correlating with mineralization-controlling faults. Ultimately, the integration of these diverse geophysical methods with the geological context proves highly effective in mapping the structural controls critical for mineralization in the Kaligesing area. The consistent and mutually reinforcing interpretations derived from the combined datasets significantly enhance confidence in identifying prospective zones. This study not only contributes valuable insights into the geological and structural evolution of the Menoreh Mountains but also provides a practical framework for guiding future mineral exploration efforts in the region. While this research successfully identifies prospective areas, the logical next step would involve validating these geophysical anomalies through direct geological sampling, trenching, or drilling, building upon this strong geophysical foundation to confirm the nature and economic viability of the mineralized zones. This paper thus represents a significant advancement in understanding and targeting mineral resources in similar geological settings.

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