Leucogranites of the Himalaya/Karakoram: implications for magmatic evolution within collisional belts and the study of collision-related leucogranite petrogenesis

Crawford, M. B.; Windley, Brian F.

doi:10.1016/0377-0273(90)90008-4

Cited by 55 publications

(35 citation statements)

References 39 publications

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“…Major-element Harker diagrams show negative relationships between CaO, MnO, P 2 O 5 , TiO 2 , MgO, and Fe 2 O 3 with SiO 2 while K 2 O shows the opposite, consistent with a fractionation of minerals such as hornblende, biotite, and plagioclase. Moreover, the amphibole free specimen (S95) has higher alkali, LILE and HFSE also consistent with a fractionating magmatic source (Whalen et al, 1987;Crawford and Windley, 1990;Chappell, 1999;Chu et al, 2009;Deng et al, 2011).…”

Section: Buni-zom Plutonsupporting

confidence: 53%

Rifting, subduction and collisional records from pluton petrogenesis and geochronology in the Hindu Kush, NW Pakistan

et al. 2016

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New U-(Th)/Pb geochronology and geochemical analyses of plutonic bodies in the Hindu Kush range, NW Pakistan, provide insight on the crustal growth and tectonic evolution of the southern Eurasian margin. These new data outline a protracted magmatic history that spans the Cambrian to the Neogene (ca. 538 to 23 Ma) and record a variety of petrogenetic associations variably influenced by within plate, volcanic arc, and collision tectonic environments. The Kafiristan pluton (538 ± 4 to 487 ± 3 Ma) yields geochemical signatures consistent with extensional plutonism and rifting of the Hindu Kush terrane from Gondwana. The Tirich Mir (127 ± 1 to 123 ± 1 Ma) and Buni-Zom (110 ± 1 to 104 ± 1 Ma) plutons have geochemical signatures that can be attributed to a subduction related continental volcanic arc system that developed along the southern margin of Eurasia in the Mesozoic. The Garam Chasma pluton, the youngest body in the study area (27.3 ± 0.5 to 22.8 ± 0.4 Ma), yields a geochemical signature consistent with widespread anatexis during crustal thickening related to the development of the Himalaya. The present geochemical and geochronological analysis from the Hindu Kush have produced important new constraints on the timing of tectonic events and variable tectonic settings along the south Eurasian margin before and after the continued India-Asia collision.

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Section: Buni-zom Plutonsupporting

confidence: 53%

Rifting, subduction and collisional records from pluton petrogenesis and geochronology in the Hindu Kush, NW Pakistan

et al. 2016

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“…Leucogranitic melts can be produced by crustal anatexis or by extreme crystal fractionation of granite melted at the base of the lower crust, promoted and contaminated by mantle magmas (Crawford and Windley 1990). In the first case, leucogranites are formed in the middle crust from fertile metapelites (e.g., Le Breton and Thompson 1988;Vielzeuf and Holloway 1988;Patiño Douce and Johnston 1991;Pickering and Johnston 1998), metagreywackes (e.g., Patiño Douce and Beard 1996; Montel and Vielzeuf 1997), or biotite-muscovite gneisses (Holtz and Johannes 1991;Castro et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Generation and emplacement of shear-related highly mobile crustal melts: the synkinematic leucogranites from the Variscan Tormes Dome, Western Spain

Moro

Plaza

Romer

2011

Int J Earth Sci (Geol Rundsch)

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The Tormes dome consists of S-type granites that intruded into Ordovician augen gneisses and Neoproterozoic-Lower Cambrian metapelites/metagreywackes at different extents of migmatization. S-type granites are mainly equigranular two-mica granites, occurring as: (1) enclave-laden subvertical feeder dykes, (2) small external sill-like bodies with size and shape relations indicative for self-similar pluton growth, and (3) as large pluton bodies, emplaced at higher levels than the external ones. These magmas were highly mobile as it is inferred from the high contents of fluxing components, the disintegration and alignment of pelitic xenoliths in feeder dykes and at the bottom of some sill-like bodies. Field relations relate this 311 Ma magmatism (U-Pb monazite) to the regional shearing of the D 3 Variscan event. Partial melting modeling and the relatively high estimated liquidus temperatures indicate biotite-dehydration partial melting (800-840°C and 400-650 MPa) rather than water-fluxed melting, implying that there was no partial melting triggered by externally derived fluids in the shear zones. Instead, the subvertical shear zones favored extraction of melts that formed during the regional migmatization event around 320 Ma. Nd isotope variation among the granites might reflect disequilibrium partial melting or different protoliths. Mass-balance and trace element partial melting modeling strongly suggest two kinds of fertile crustal protoliths: augen gneisses and metapelites. Slight compositional variation among the leucogranites does not reflect different extent of protolith melting but is related to a small amount of fractional crystallization (\13% for the equigranular granites), which is generally more pronounced in shallower batholitic leucogranites than in the small and homogeneous sill-like bodies. The lower extent of fractional crystallization and the higher-pressure emplacement conditions of the sill-like bodies support a more restricted movement through the crust than for batholitic leucogranites.

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“…Rocks with similar geochemical and petrologic characteristics emplaced during a subduction-collision event have been recognized in the Karakoram Axial batholith of northern Pakistan (Baltoro plutonic unit, Hunza leucogranite; Crawford and Windley, 1990), the Pan-African belt of the Arabian shield (Jackson et al, 1984), the Homrit Waggat complex of Egypt (Hassanen, 1997), and the Qinling belt of China (Mattauer et al, 1985).…”

Section: Meyer Suitementioning

confidence: 98%

A Late Proterozoic–Early Paleozoic magmatic cycle in Sierra de la Ventana, Argentina

Gregori

López

Grecco

2005

Journal of South American Earth Sciences

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Leucogranites of the Himalaya/Karakoram: implications for magmatic evolution within collisional belts and the study of collision-related leucogranite petrogenesis

Cited by 55 publications

References 39 publications

Rifting, subduction and collisional records from pluton petrogenesis and geochronology in the Hindu Kush, NW Pakistan

Rifting, subduction and collisional records from pluton petrogenesis and geochronology in the Hindu Kush, NW Pakistan

Generation and emplacement of shear-related highly mobile crustal melts: the synkinematic leucogranites from the Variscan Tormes Dome, Western Spain

A Late Proterozoic–Early Paleozoic magmatic cycle in Sierra de la Ventana, Argentina

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