Curie point depth from spectral analysis of aeromagnetic data for geothermal reconnaissance in Afghanistan

Hakim Saibi, E. Aboud, J. Gottsmann

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The geologic setting of Afghanistan has the potential to contain significant mineral, petroleum and geothermal resources. However, much of the country's potential remains unknown due to limited exploration surveys. Here, we present countrywide aeromagnetic data to estimate the Curie point depth (CPD) and to evaluate the geothermal exploration potential.CPD is an isothermal surface at which magnetic minerals lose their magnetization and as such outlines an isotherm of about 580 °C. We use spectral analysis on the aeromagnetic data to estimate the CPD spatial distribution and compare our findings with known geothermal fields in the western part of Afghanistan.The results outline four regions with geothermal potential: 1) regions of shallow Curie point depths (~16-21 km) are located in the Helmand basin. 2) regions of intermediate depths (~21-27 km) are located in the southern Helmand basin and the Baluchistan area. 3) Regions of great depths (~25-35 km) are located in the Farad block. 4) Regions of greatest depths (~35-40 km) are located in the western part of the northern Afghanistan platform. The deduced thermal structure in western Afghanistan relates to the collision of the Eurasian and Indian plates, while the shallow CPDs are related to crustal thinning. This study also shows that the geothermal systems are associated with complex magmatic and tectonic association of major intrusions and fault systems. Our results imply geothermal gradients ranging from 14 °C/km to 36 °C/km and heat-flow values ranging from 36 to 90 mW/m2 for the study area.

Original languageEnglish
Pages (from-to)92-99
Number of pages8
JournalJournal of African Earth Sciences
Volume111
DOIs
Publication statusPublished - Nov 1 2015

Fingerprint

Curie point
aeromagnetic survey
spectral analysis
crustal thinning
Indian plate
magnetic mineral
Eurasian plate
geothermal gradient
geothermal system
thermal structure
magnetization
basin
heat flow
isotherm
collision
petroleum
spatial distribution
tectonics
mineral
resource

All Science Journal Classification (ASJC) codes

  • Geology
  • Earth-Surface Processes

Cite this

Curie point depth from spectral analysis of aeromagnetic data for geothermal reconnaissance in Afghanistan. / Saibi, Hakim; Aboud, E.; Gottsmann, J.

In: Journal of African Earth Sciences, Vol. 111, 01.11.2015, p. 92-99.

Research output: Contribution to journalArticle

@article{1c6f3accb1a241f19230a1906b95c6a6,
title = "Curie point depth from spectral analysis of aeromagnetic data for geothermal reconnaissance in Afghanistan",
abstract = "The geologic setting of Afghanistan has the potential to contain significant mineral, petroleum and geothermal resources. However, much of the country's potential remains unknown due to limited exploration surveys. Here, we present countrywide aeromagnetic data to estimate the Curie point depth (CPD) and to evaluate the geothermal exploration potential.CPD is an isothermal surface at which magnetic minerals lose their magnetization and as such outlines an isotherm of about 580 °C. We use spectral analysis on the aeromagnetic data to estimate the CPD spatial distribution and compare our findings with known geothermal fields in the western part of Afghanistan.The results outline four regions with geothermal potential: 1) regions of shallow Curie point depths (~16-21 km) are located in the Helmand basin. 2) regions of intermediate depths (~21-27 km) are located in the southern Helmand basin and the Baluchistan area. 3) Regions of great depths (~25-35 km) are located in the Farad block. 4) Regions of greatest depths (~35-40 km) are located in the western part of the northern Afghanistan platform. The deduced thermal structure in western Afghanistan relates to the collision of the Eurasian and Indian plates, while the shallow CPDs are related to crustal thinning. This study also shows that the geothermal systems are associated with complex magmatic and tectonic association of major intrusions and fault systems. Our results imply geothermal gradients ranging from 14 °C/km to 36 °C/km and heat-flow values ranging from 36 to 90 mW/m2 for the study area.",
author = "Hakim Saibi and E. Aboud and J. Gottsmann",
year = "2015",
month = "11",
day = "1",
doi = "10.1016/j.jafrearsci.2015.07.019",
language = "English",
volume = "111",
pages = "92--99",
journal = "Journal of African Earth Sciences",
issn = "1464-343X",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Curie point depth from spectral analysis of aeromagnetic data for geothermal reconnaissance in Afghanistan

AU - Saibi, Hakim

AU - Aboud, E.

AU - Gottsmann, J.

PY - 2015/11/1

Y1 - 2015/11/1

N2 - The geologic setting of Afghanistan has the potential to contain significant mineral, petroleum and geothermal resources. However, much of the country's potential remains unknown due to limited exploration surveys. Here, we present countrywide aeromagnetic data to estimate the Curie point depth (CPD) and to evaluate the geothermal exploration potential.CPD is an isothermal surface at which magnetic minerals lose their magnetization and as such outlines an isotherm of about 580 °C. We use spectral analysis on the aeromagnetic data to estimate the CPD spatial distribution and compare our findings with known geothermal fields in the western part of Afghanistan.The results outline four regions with geothermal potential: 1) regions of shallow Curie point depths (~16-21 km) are located in the Helmand basin. 2) regions of intermediate depths (~21-27 km) are located in the southern Helmand basin and the Baluchistan area. 3) Regions of great depths (~25-35 km) are located in the Farad block. 4) Regions of greatest depths (~35-40 km) are located in the western part of the northern Afghanistan platform. The deduced thermal structure in western Afghanistan relates to the collision of the Eurasian and Indian plates, while the shallow CPDs are related to crustal thinning. This study also shows that the geothermal systems are associated with complex magmatic and tectonic association of major intrusions and fault systems. Our results imply geothermal gradients ranging from 14 °C/km to 36 °C/km and heat-flow values ranging from 36 to 90 mW/m2 for the study area.

AB - The geologic setting of Afghanistan has the potential to contain significant mineral, petroleum and geothermal resources. However, much of the country's potential remains unknown due to limited exploration surveys. Here, we present countrywide aeromagnetic data to estimate the Curie point depth (CPD) and to evaluate the geothermal exploration potential.CPD is an isothermal surface at which magnetic minerals lose their magnetization and as such outlines an isotherm of about 580 °C. We use spectral analysis on the aeromagnetic data to estimate the CPD spatial distribution and compare our findings with known geothermal fields in the western part of Afghanistan.The results outline four regions with geothermal potential: 1) regions of shallow Curie point depths (~16-21 km) are located in the Helmand basin. 2) regions of intermediate depths (~21-27 km) are located in the southern Helmand basin and the Baluchistan area. 3) Regions of great depths (~25-35 km) are located in the Farad block. 4) Regions of greatest depths (~35-40 km) are located in the western part of the northern Afghanistan platform. The deduced thermal structure in western Afghanistan relates to the collision of the Eurasian and Indian plates, while the shallow CPDs are related to crustal thinning. This study also shows that the geothermal systems are associated with complex magmatic and tectonic association of major intrusions and fault systems. Our results imply geothermal gradients ranging from 14 °C/km to 36 °C/km and heat-flow values ranging from 36 to 90 mW/m2 for the study area.

UR - http://www.scopus.com/inward/record.url?scp=84939422611&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84939422611&partnerID=8YFLogxK

U2 - 10.1016/j.jafrearsci.2015.07.019

DO - 10.1016/j.jafrearsci.2015.07.019

M3 - Article

AN - SCOPUS:84939422611

VL - 111

SP - 92

EP - 99

JO - Journal of African Earth Sciences

JF - Journal of African Earth Sciences

SN - 1464-343X

ER -