Petrography and geochemistry of dolomites of samanasuk formation, Dara Adam khel section, Kohat ranges, Pakistan
Replacement dolomite occurs in Jurassic Samanasuk Formation in Dara Adam khel area of Kohat ranges, North-Western Himalayas, Pakistan. This study, for the first time, document the process of dolomitization and evolution of strata bound dolomitic bodies. Field investigation, petrography and geochemis...
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| Format: | Article |
| Language: | English |
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Penerbit Universiti Kebangsaan Malaysia
2021
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| Online Access: | http://journalarticle.ukm.my/18293/1/5.pdf |
| _version_ | 1796932816677634048 |
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| author | Khan, Emad Ullah Naseem, Abbas Ali Saleem, Maryam Rehman, Faisal Sajjad, Syed Waseem Ahmad, Waqar Azeem, Tahir |
| author_facet | Khan, Emad Ullah Naseem, Abbas Ali Saleem, Maryam Rehman, Faisal Sajjad, Syed Waseem Ahmad, Waqar Azeem, Tahir |
| author_sort | Khan, Emad Ullah |
| collection | UKM |
| description | Replacement dolomite occurs in Jurassic Samanasuk Formation in Dara Adam khel area of Kohat ranges, North-Western Himalayas, Pakistan. This study, for the first time, document the process of dolomitization and evolution of strata bound dolomitic bodies. Field investigation, petrography and geochemistry helped in unraveling the formation of several dolomitic bodies. Petrographically dolomites comprises of: (1) medium grain crystalline planer subhedral dolomite (Dol-I); (2) fine grained crystalline anhedral non-planer dolomite rhombs (Dol-II); (3) medium to coarse grained crystalline subhedral-anhedral non-planer dolomite (Dol-III) and coarse to very coarse grained crystalline saddle dolomite cements (SD). The saddle dolomites (SD) postdate the replacement dolomites and precede telogenetic calcite (TC) cements. Stable O and C isotope analysis shows that these dolomites have δ18Ovpdb ranging from -4.09% to -10.4 whereas the δ13Cvpdb ranges from +0.8 to +2.51. Major and trace elements data show that Sr concentrations of 145.5 to 173 ppm; Fe contents of 2198 to 8215 ppm; and Mn contents of 93.5 to 411 ppm. Petrographically replacive dolomites, saddle dolomite, and δ18Ovpdb values depicts neomorphism of replacement dolomites that were formed earlier were exposed to late dolomitizing fluids. As a result of basin uplift during the Himalayan orogeny in Eocene time, dolomitization event was stopped through occurrence of meteoric water. The Main Boundary Thrust (MBT) and its splays were most likely essential conduits that channelized dolomitizing fluids from siliciclastic rocks that were buried deeply into the Jurassic carbonates rocks, leading to more extreme dolomitization. |
| first_indexed | 2024-03-06T04:38:09Z |
| format | Article |
| id | ukm.eprints-18293 |
| institution | Universiti Kebangsaan Malaysia |
| language | English |
| last_indexed | 2024-03-06T04:38:09Z |
| publishDate | 2021 |
| publisher | Penerbit Universiti Kebangsaan Malaysia |
| record_format | dspace |
| spelling | ukm.eprints-182932022-04-06T05:33:41Z http://journalarticle.ukm.my/18293/ Petrography and geochemistry of dolomites of samanasuk formation, Dara Adam khel section, Kohat ranges, Pakistan Khan, Emad Ullah Naseem, Abbas Ali Saleem, Maryam Rehman, Faisal Sajjad, Syed Waseem Ahmad, Waqar Azeem, Tahir Replacement dolomite occurs in Jurassic Samanasuk Formation in Dara Adam khel area of Kohat ranges, North-Western Himalayas, Pakistan. This study, for the first time, document the process of dolomitization and evolution of strata bound dolomitic bodies. Field investigation, petrography and geochemistry helped in unraveling the formation of several dolomitic bodies. Petrographically dolomites comprises of: (1) medium grain crystalline planer subhedral dolomite (Dol-I); (2) fine grained crystalline anhedral non-planer dolomite rhombs (Dol-II); (3) medium to coarse grained crystalline subhedral-anhedral non-planer dolomite (Dol-III) and coarse to very coarse grained crystalline saddle dolomite cements (SD). The saddle dolomites (SD) postdate the replacement dolomites and precede telogenetic calcite (TC) cements. Stable O and C isotope analysis shows that these dolomites have δ18Ovpdb ranging from -4.09% to -10.4 whereas the δ13Cvpdb ranges from +0.8 to +2.51. Major and trace elements data show that Sr concentrations of 145.5 to 173 ppm; Fe contents of 2198 to 8215 ppm; and Mn contents of 93.5 to 411 ppm. Petrographically replacive dolomites, saddle dolomite, and δ18Ovpdb values depicts neomorphism of replacement dolomites that were formed earlier were exposed to late dolomitizing fluids. As a result of basin uplift during the Himalayan orogeny in Eocene time, dolomitization event was stopped through occurrence of meteoric water. The Main Boundary Thrust (MBT) and its splays were most likely essential conduits that channelized dolomitizing fluids from siliciclastic rocks that were buried deeply into the Jurassic carbonates rocks, leading to more extreme dolomitization. Penerbit Universiti Kebangsaan Malaysia 2021-11 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/18293/1/5.pdf Khan, Emad Ullah and Naseem, Abbas Ali and Saleem, Maryam and Rehman, Faisal and Sajjad, Syed Waseem and Ahmad, Waqar and Azeem, Tahir (2021) Petrography and geochemistry of dolomites of samanasuk formation, Dara Adam khel section, Kohat ranges, Pakistan. Sains Malaysiana, 50 (11). pp. 3205-3217. ISSN 0126-6039 https://www.ukm.my/jsm/malay_journals/jilid50bil11_2021/KandunganJilid50Bil11_2021.html |
| spellingShingle | Khan, Emad Ullah Naseem, Abbas Ali Saleem, Maryam Rehman, Faisal Sajjad, Syed Waseem Ahmad, Waqar Azeem, Tahir Petrography and geochemistry of dolomites of samanasuk formation, Dara Adam khel section, Kohat ranges, Pakistan |
| title | Petrography and geochemistry of dolomites of samanasuk formation, Dara Adam khel section, Kohat ranges, Pakistan |
| title_full | Petrography and geochemistry of dolomites of samanasuk formation, Dara Adam khel section, Kohat ranges, Pakistan |
| title_fullStr | Petrography and geochemistry of dolomites of samanasuk formation, Dara Adam khel section, Kohat ranges, Pakistan |
| title_full_unstemmed | Petrography and geochemistry of dolomites of samanasuk formation, Dara Adam khel section, Kohat ranges, Pakistan |
| title_short | Petrography and geochemistry of dolomites of samanasuk formation, Dara Adam khel section, Kohat ranges, Pakistan |
| title_sort | petrography and geochemistry of dolomites of samanasuk formation dara adam khel section kohat ranges pakistan |
| url | http://journalarticle.ukm.my/18293/1/5.pdf |
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