Porphyry Body and Geological Structure Identification as Control of Low Sulphidation Epithermal System in Sangon, Kokap Sub-District, Kulonprogo Regency, Special Region of Yogyakarta, Indonesia

Akmal Dzulfikar; Anang Sahroni; Bachruddin Ashari; Diah Ayu R; Erwina Sofia Br Sembiring; Fadia Zharfa Ash S; Lilik Maryanto; Lutfi Afgani; M Nurrahman; M Rahmat C; Muslihul Zaim; Novita Triswi H; Riando Elang D; Siti Fadzillah; Ulya Habiburrahman

doi:10.22146/jfi.v22i3.55461

Porphyry Body and Geological Structure Identification as Control of Low Sulphidation Epithermal System in Sangon, Kokap Sub-District, Kulonprogo Regency, Special Region of Yogyakarta, Indonesia

https://doi.org/10.22146/jfi.v22i3.55461

Akmal Dzulfikar^(1*), Anang Sahroni⁽²⁾, Bachruddin Ashari⁽³⁾, Diah Ayu R⁽⁴⁾, Erwina Sofia Br Sembiring⁽⁵⁾, Fadia Zharfa Ash S⁽⁶⁾, Lilik Maryanto⁽⁷⁾, Lutfi Afgani⁽⁸⁾, M Nurrahman⁽⁹⁾, M Rahmat C⁽¹⁰⁾, Muslihul Zaim⁽¹¹⁾, Novita Triswi H⁽¹²⁾, Riando Elang D⁽¹³⁾, Siti Fadzillah⁽¹⁴⁾, Ulya Habiburrahman⁽¹⁵⁾

(1) Geophysics Sub-Department, Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada
(2) Geophysics Sub-Department, Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada
(3) Geophysics Sub-Department, Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada
(4) Geophysics Sub-Department, Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada
(5) Geophysics Sub-Department, Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada
(6) Geophysics Sub-Department, Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada
(7) Geophysics Sub-Department, Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada
(8) Geophysics Sub-Department, Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada
(9) Geophysics Sub-Department, Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada
(10) Geophysics Sub-Department, Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada
(11) Geophysics Sub-Department, Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada
(12) Geophysics Sub-Department, Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada
(13) Geophysics Sub-Department, Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada
(14) Geophysics Sub-Department, Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada
(15) Geophysics Sub-Department, Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada
(*) Corresponding Author

Abstract

There is gravity measurement that is supported by magnetic measurement in Sangon to identify porphyry body and geological structure as low sulfidation epithermal system control. The survey area is 6.4 x 5.6 km for gravity method and 2.5 x 1.2 km for the magnetic method. The value of gravity anomaly after flat plane reduction processing is 122-142 mGal which is positive anomaly located in the north-eastern area and negative anomaly to 82- 102 mGal located in the south-western area. Whereas the magnetic residual anomaly is - 800-1300nT.

Conducted 2.5 D modelling of gravity method that is based on local anomaly slice. The result of 2.5D modelling show that an intrusion body interpreted as Dacite intrusion as host rock which plays a role as a heat source of the mineralization system. The density of Dacite is 2.70 gr/cm3. The result of gravity modelling has a correlation with the result of magnetic modelling. Based on magnetic modelling, the intrusion body is located in the south-west.

Keywords

Gravity, Magnetic, Sangon, Kulonprogo, 2.5D Modelling, Dacite, Intrusion, Mineralization

Full Text:

PDF

References

Grant F, West G. Interpretation Theory in Applied Geophysics. McGraw-Hill; 1965.
Hinze WJ, Frese RRBv, A H S. Gravity and Magnetic Exploration. United Kingdom: Cambridge University Press; 2013.
Telford, al E. Applied Geophysics:Second Edition. 2nd ed. New York: Cambridge University Press; 1990.
Schureman P. A manual of The harmonic analysis and prediction of The Tides. Spesial pu ed. U.S. Coast and Geodetic Survey; 1924.
Longman IM. Formulas for computing The tidal acceleration due to The moon and The sun. J Geophys Res. 1959;64(12):2351–2355.
Parasnis DS, Cook AH. A study of rock densities in The english midlands. Geophys J Int. 1952;6(5):252–271.
Cahyo AT. Perbandingan Metode Proyeksi Ke Bidang Datar Pada Data Anomali Gravitasi. Yogyakarta; 2014.
Bateman AM, Jensen ML. Economic Mineral Deposits. Australia, Lemited: John Wiley and Sons; 1981.

DOI: https://doi.org/10.22146/jfi.v22i3.55461

Article Metrics

Abstract views : 1167 |

Refbacks

There are currently no refbacks.

Copyright (c) 2020 Akmal Dzulfikar, Anang Sahroni, Bachruddin Ashari, Diah Ayu R, Erwina Sofia Br Sembiring, Fadia Zharfa Ash S, Lilik Maryanto, Lutfi Afgani, M Nurrahman, M Rahmat C, Muslihul Zaim, Novita Triswi H, Riando Elang D, Siti Fadzillah, Ulya Habiburrahman