Electrical resistivity structures and tectonic implications of Main Karakorum Thrust (MKT) in the western Himalayas: NNE Pakistan

Shah, Syed Tallataf Hussain; Zhao, Junmeng; Xiao, Qibin; Bhatti, Zahid Imran; Khan, Nasrullah; Zhang, Heng; Deng, Guanjun; Liu, Hongbing

doi:10.1016/j.pepi.2018.02.003

Cited by 6 publications

(4 citation statements)

References 31 publications

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“…This resulted in melting and production of leucogranites/pegmatites and then crystallization till $3 Ma (Figure 13). This short melting event is compatible with continental slab break-off thermo-mechanical modelling, suggesting a mantle melting duration of a few million years (Van de Zedde & Wortel, 2001), whereas Shah et al (2018) suggest the ongoing magmatism using geophysical parameters. Generally, crustal melt crystallization took place as late as $13 Ma in Baltoro (Mahar et al, 2014;Searle et al, 2010), and as late as $7-3 Ma in the Dassu area (KMC) from this study (Table 1), whereas, $9 Ma in the Pangong Range and Karakoram Shear Zone (Horton & Leech, 2013).…”

Section: Geodynamic Significancesupporting

confidence: 76%

“…Towards the SW of Dassu, Kohistan Ladakh Batholith (Petterson, 2019), there is a reflection of contamination, but the age gap is dominant, which is pre‐collisional. However, the ongoing magmatism may not be ignored (Shah et al, 2018). Therefore, this event implies the melting of the mid‐lower crustal source and metasomatized Asian mantle (Mahéo et al, 2009; Williams, Turner, Pearce, Kelley, & Harris, 2004).…”

Section: Discussionmentioning

confidence: 99%

“…However, the ongoing magmatism may not be ignored (Shah et al, 2018). Therefore, this event implies the melting of the midlower crustal source and metasomatized Asian mantle (Mahéo et al, 2009;Williams, Turner, Pearce, Kelley, & Harris, 2004).…”

Section: Petrogenesismentioning

confidence: 99%

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U(‐Th)–Pb age and petrogenesis of Shigar leucogranites, Karakoram Metamorphic Complex, North Pakistan

et al. 2022

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The Shigar valley of northern Pakistan is a well‐known region for holding a variety of gemstones. As the gemstone‐bearing rock, post‐collisional leucogranites, and pegmatites in Shigar valley have been sporadically researched but the detailed and updated timing record along with the source rocks were not adequate. Here, we present comprehensive U(‐Th)Pb ages, mineral, and whole‐rock isotopic analyses to investigate the petrogenetic evolution of these granitoids. The zircon, xenotime, and monazite U(‐Th)–Pb ages show crystallization of leucogranites that spanned as recent as ~7–3 Ma. The REEs with nearly smooth patterns and distinct negative Eu anomalies in all the leucogranites and pegmatites with contrasting negative Eu anomalies illustrate significantly plagioclase fractionation. These leucogranites and pegmatites have high SiO2 content showing peraluminous geochemistry. Zircon Hf isotopic composition of leucogranites, pegmatites and gneisses have εHf(t) values of −28.4 to +7.4, −24.0 to −16.5, and −13.2 to +1.8, respectively, which shows crustal origin along with the probable contamination from Kohistan‐Ladakh Arc at depths. Furthermore, monazite Nd isotopic composition of leucogranites, pegmatites, and gneisses have εNd(t) values of −22.9 to −9.5, −25.1 to −22.8, and −26.3 to −24.8, which seems purely from crustal source. The whole‐rock Sr‐Nd‐Hf isotopic composition shows that leucogranites and gneisses have 87Sr/86Sr(i) values of 0.71603 to 0.92518, εNd(t) values of −22.2 to −2.7, and εHf(t) values of −44.1 to −0.2, respectively, that also confines it to the metapelitic origin. Our results overall reveal that the leucogranites are produced mainly by the partial melting of Dassu felsic gneiss from the Karakoram Metamorphic Complex, showing signatures of the upper crustal rocks of the subducting Indian Plate and hybridized juvenile Asian crust. The input of heat for partial melting is likely to be derived either from the lithospheric mantle which followed the slab break‐off or from shear heating along Main Karakoram Thrust. Furthermore, a leucogranite sample yielded a zircon U–Pb age of 84.9 Ma, and monazite U(‐Th)–Pb age of 10.8 Ma. The in‐situ zircon Hf and monazite Nd isotopes yielded εHf(t) values of +3.6 to +10.7, and εNd(t) values of +1.0 to +2.4, whereas the whole‐rock 87Sr/86Sr(i) value is 0.70522, εNd(t) is +1.1, and εHf(t) is +4.8, respectively, which confirms it to be sourced from the nearby Kohistan‐Ladakh Arc.

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Section: Geodynamic Significancesupporting

confidence: 76%

Section: Discussionmentioning

confidence: 99%

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U(‐Th)–Pb age and petrogenesis of Shigar leucogranites, Karakoram Metamorphic Complex, North Pakistan

et al. 2022

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“…The Indian plate is separated from Gondwanaland, traveled 5000km northward before colliding with the Eurasian plate, resulting in the closure of Neo-Tethys Ocean to the North and opening of Indian Ocean in the South. This continent-continent collision of the Indian and Eurasian plates forms the great Himalayan mountain belt [8,9]. As far as the Indian plate is concerned which is subducting under the Eurasian plate along its Northern edge, resulting in the generation of a sequence of North-South dipping thrusts faults.…”

Section: Geological Settingmentioning

confidence: 99%

Chromite Deposits of Pakistan: A Short Review

Shah

Tariq

Khan

et al. 2019

Int. J. Res. Granthaalayah

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Chromite is an important source for the manufacturing of stainless steel, nichrome, paint, and chemicals industries and has wide industrial utilization. In Pakistan, the chromite deposits are mostly associated with the ophiolitic sequence resulting as an outpouring of molten material in the fractured zones of the Indian plate and the Neo-Tethys Ocean through the Cretaceous era. The discovery and documentation of chromite in Pakistan is traveling back to 1960s, but unfortunately, most of the reports are lacking authentication in reserve estimation and grading. If the modern and proper geophysical and geochemical analysis is performed to the reported area, then there are more bright chances of acquiring the more authenticate reservoir estimation, its distribution in the prospect zone and chemical composition per metric ton. The current article is an effort towards making a composite record of all the published/unpublished reports and articles regarding the chromite discovery, estimation, and extraction in Pakistan.

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Granitoids of the western Himalaya and Karakoram as potential geothermal reservoirs – A petrological, geochemical and petrophysical study

Anees,

Sosa,

Van den Kerkhof

et al. 2024

Geothermics

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Electrical resistivity structures and tectonic implications of Main Karakorum Thrust (MKT) in the western Himalayas: NNE Pakistan

Cited by 6 publications

References 31 publications

U(‐Th)–Pb age and petrogenesis of Shigar leucogranites, Karakoram Metamorphic Complex, North Pakistan

U(‐Th)–Pb age and petrogenesis of Shigar leucogranites, Karakoram Metamorphic Complex, North Pakistan

Chromite Deposits of Pakistan: A Short Review

Granitoids of the western Himalaya and Karakoram as potential geothermal reservoirs – A petrological, geochemical and petrophysical study

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