Blank on the Geological Map

Gaetani, Maurizio

doi:10.1007/s12210-015-0494-2

Cited by 7 publications

(3 citation statements)

References 34 publications

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“…whose P-T conditions of formation were constrained by Groppo and Rolfo (2008) Karakourm has been constrained as Middle to Late Cretaceous basing on stratigraphic data (e.g. Gaetani et 669 al., 1990bGaetani et 669 al., , 1993Robinson et al, 2004;Gaetani, 2016), age of syn-orogenic 670 magmatism (e.g. Fraser et al, 2001;Heuberger et al, 2007;Searle and Philipps, 2007; and 671 metamorphic studies (e.g.…”

Section: The Late Cretaceous Collision Between the Surukwat Complex Amentioning

confidence: 99%

Pre-Cenozoic evolution of the Aghil Range (western Tibetan Plateau): A missing piece of the Tibet-Pamir-Karakorum geopuzzle

et al. 2019

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The Tibetan Plateau, largely derived from the accretion of several Gondwana microplates to the southern 24 margin of Asia since the late Palaeozoic, is the highest and largest topographic relief on Earth. Although the 25 first order geodynamic processes responsible for its pre-Cenozoic evolution are quite well-known, many 26 issues are still debated, among which is the timing of collision of each terrane with the southern margin of 27 Asia. Even more uncertain is the pre-Palaeozoic history of these terranes, due to the lack of basement 28 exposures. As a contribution to understanding the pre-Cenozoic evolution of the Tibetan Plateau, this paper 29 focuses on the Aghil Range, a remote and poorly investigated area close to the Karakorum Fault between 30 Kunlun and Karakorum (Xinjiang, China) in western Tibet. The tectono-metamorphic and magmatic 31 evolution of the Aghil Range is investigated using a multidisciplinary approach that combines field mapping, 32 petrology and geochronology (U-Pb on titanite, zircon, monazite and xenotime using SHRIMP-RG). We 33 demonstrate that the Aghil Range preserves a coherent slice of Neoproterozoic crystalline basement with a 34 late Palaeozoic sedimentary cover deposited on a passive continental margin during the Gondwana break-35 up. This represents the westernmost exposure of Precambrian crystalline basement known so far in the 36 Tibetan Plateau. Furthermore, petrological and geochronological results allow reconstructing the Mesozoic 37 poly-metamorphic evolution of this sector of the Tibetan Plateau, which records the evidence of Middle 38 Jurassic (ca. 170 Ma) and Late Cretaceous (66 Ma) collisional events, as well as of the Late Jurassic (ca. 150 39 Ma) early subduction of an accretionary complex developed on its southern margin. Evidence of Late 40 Cretaceous subduction-related magmatism preceding the last collisional event is also recorded. These 41 results allow tentative correlation of the different terranes of Central Tibet with those of the Pamir-42 Karakorum Range on both sides of the Karakorum fault. 43

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Section: The Late Cretaceous Collision Between the Surukwat Complex Amentioning

confidence: 99%

Pre-Cenozoic evolution of the Aghil Range (western Tibetan Plateau): A missing piece of the Tibet-Pamir-Karakorum geopuzzle

et al. 2019

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“…In contrast, the K2 and western side of Broad Peak region is mainly composed of ortho‐ and paragneisses (plagioclase‐hornblende and biotite‐hornblende‐K‐feldspar), intruded by leucogranitic dikes. The rocks are weakly metamorphosed along the Baltoro glacier and are strongly deformed (Figure 1; Desio, 1979; Gaetani, 2016).…”

Section: Geological Settingmentioning

confidence: 99%

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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“…The study area falls in Karakorum block, which comprises of low to medium grade metamorphism, from west to east. The metamorphic grade is gradually increased due to continuous movement of Indian plate drifted island arc to northward, which may cause collision zone between Eurasian plate with Kohistan island arc, known as Main Karakorum Thrust (Gaetani, 2016). There are six offshoots of MKT crossing parallel to each other along Karakoram highway from Chalt to Ahmadabad (Fig.…”

Section: Introductionmentioning

confidence: 99%

Landslide Hazard Risk Assessment and Landuse Planning of Mayoon, Hunza, GilgitBaltistan, Pakistan

Khan¹,

Alam²,

Ali³

et al. 2020

IJEEG

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Gilgit-Baltistan, Pakistan is highly vulnerable and hazard-prone area according to National DisasterManagerment Authority, based on frequency of avalanches, landslides, glacier lake outburst floods, rockfall and flashfloods. These hazards have been quite frequent since 2010, potentially due to changing climatic conditions and uniquetectonic setting resulting in massive destruction, economic loss and human migration. In this study, geospatial techniques(GIS/RS) were used to identify landslide hazard with elements at risk. The resultant maps will be used for betterplanning and resilience of local communities. Landslide area has been marked based on field observations (GPS data).Risk category is ranked high, medium and low based on field observations, geological setting and historical landslidedata. There are six offshoots of MKT crossing parallel to each other along KKH from Chalt to Ahmadabad. Chalt fault iscrossing nearby the Mayoon landslide, which may affect the entire valley. This study identifies landslide as a majorhazard in the area.

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Blank on the Geological Map

Abstract: This paper summarizes the history of the geological studies performed by Italian teams in the Karakorum-East Hindu Kush ranges (Pakistan and Sinkiang, China) over the past 35 years. These studies began under

Cited by 7 publications

References 34 publications

Pre-Cenozoic evolution of the Aghil Range (western Tibetan Plateau): A missing piece of the Tibet-Pamir-Karakorum geopuzzle

Pre-Cenozoic evolution of the Aghil Range (western Tibetan Plateau): A missing piece of the Tibet-Pamir-Karakorum geopuzzle

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

Landslide Hazard Risk Assessment and Landuse Planning of Mayoon, Hunza, GilgitBaltistan, Pakistan

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