Structural evolution of a crustal section in the western Himalaya

Coward, M. P.; Jan, M. Q.; Rex, D. C.; Tarney, J.; Thirlwall, M. F.; Windley, Brian F.

doi:10.1038/295022a0

Cited by 46 publications

(17 citation statements)

References 6 publications

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“…3. Virdi, 1981;Andrews-Speed and Brookfield, 1982;Coward et al, 1982Coward et al, , 1986Honegger et al, 1982, Jan andAsif, 1983;Thakur and Sharma, 1983;Jan, 1985;Petterson and Windley, 1985). Fossil evidence, radiometric dates and paleomagnetic data indicate that arc magmatism started in late Jurassic and continued during the Cretaceous, before the closure of the neoTethys during the Eocene (Powell, 1979;Dietrich et al, 1983;Molnar, 1986).…”

Section: Discussionmentioning

confidence: 99%

“…Although the latter are volcanic and plutonic, they may represent a metamor- Fig. 3. phosed limb of the Chalt volcanics around the Jaglot syncline (Coward et al, 1982). The Chalt volcanics consist of pillow-bearing, primitive island arc-type, tholeiitic lavas succeeded by calcalkaline andesite to rhyolites (I.W.…”

Section: Discussionmentioning

confidence: 99%

“…Several lithologies common to Kohistan and Ladakh are separated by the N-S elongated Nanga Parbat-Haramosh dome. The Kohistan part appears to represent a deeper and the Ladakh part a shallower section of the arc that became an Andean-type margin during the Late Cretaceous (for further details, see Tahirkheli and Jan, 1979;Tahirkheli et al, 1979;Klootwijk et al, 1979;Andrews-Speed and Brookfield, 1982;Coward et al, 1982Coward et al, , 1986Mineralogical Magazine, April 1988, Vol. 52, pp.…”

Section: The Indus Zangbo Suture (Izs) In Ladakh Andmentioning

confidence: 99%

“…This is either due to thermal effects associated with the Chilas complex and subduction process, or to large-scale synclinal folding in the Indus valley (cf. Coward et al, 1982).…”

Section: P-t Estimates For Southern Beltmentioning

confidence: 99%

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Geochemistry of amphibolites from the southern part of the Kohistan arc, N. Pakistan

Jan

1988

Mineral. mag.

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The southern part of the Cretaceous Kohistan island arc is occupied by an extensive belt dominantly comprised of amphibolites. These include banded amphibolites of partly meta-volcanic parentage, and non-banded amphibolites derived from intrusive rock. In addition to being relict, banding has also been produced by shear deformation, metamorphic/metasomatic segregation and, possibly, by lit-par-lit injection of plagiogranitic material. Non-banded amphibolites also occur as retrograde products of noritic granulites forming the lopolithic Chilas complex. The chemistry of 37 rocks has been compared with those of known tectonic environments. The amphibolites have chemical characteristics similar to volcanic rocks found in island arcs and most of the analyses apparently support affinity with the calc-alkaline series. The amphibolites consist essentially of hornblende, plagioclase and/or epidote. Garnet and clinopyroxene have developed locally in rocks of appropriate bulk composition. Metamorphism may have taken place during the mid-Cretaceous under conditions of 550 to 680 ~ and 4.5 to 6.5 kbar PH2o. The metamorphic grade appears to increase from the centre of the southern belt toward the Chilas complex to the north and Indus-Zangbo suture (IZS) to the south. In the vicinity of the IZS, garnet-clinopyroxene + amphibole assemblage developed locally in response to high P-T.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: The Indus Zangbo Suture (Izs) In Ladakh Andmentioning

confidence: 99%

“…This is either due to thermal effects associated with the Chilas complex and subduction process, or to large-scale synclinal folding in the Indus valley (cf. Coward et al, 1982).…”

Section: P-t Estimates For Southern Beltmentioning

confidence: 99%

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Geochemistry of amphibolites from the southern part of the Kohistan arc, N. Pakistan

Jan

1988

Mineral. mag.

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“…This basic are sequence is probably of Cretaceous age, since reeks on the northern edge of the sequence contain Cretaceous fossils (Yasin Group) (DEsIo, 1974), and furthermore, a Cretaceous age is,consistent with the radiometric data as discussed below. The Kohistan Complex was intensively deformed and metamorphosed prior to the intrusion of late and post-tectonic dioritic to tonalitie reeks (CowARD et al, 1982;JAN, 1979). These give mostly Tertiary radiometrie ages and hence are approximately the same age as the youngest part of the Kohistan sequence ~ the Baranl Banda Slates and interbedded and overlying Utror Volcanics (TAmRKELI, 1979).…”

Section: P H Reynolds M E Brookfield and R H Mcnuttmentioning

confidence: 98%

The age and nature of Mesozoic-Tertiary magmatism across the Indus Suture Zone in Kashmir and Ladakh (N. W. India and Pakistan)

1983

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Eine tektonisch ruhige Phase auf der 5rtlichen indischen Kontinentalplatte im Paliioz~n und frtihen Eoz~in wiihrend der Subduktion im asiatischen Randgebiet.Ein weiterer Schub des Indischen Kontinental-Randes nach Siiden in Zusammenhang mit der Bildung eines Anden-~ilmlichen Bogens (des Ladak_h-Deosai-Batholithen) im nSrdlichen indischen Randgebiet ira Eoz~in.Ein oligoz~iner andischer Bogen (die Karakorum-Batholithen) im asiatischen Randgebier, gefolgt yon einer mioziinen KoUision der zwei Kontinente sowie der Intrusion yon ,,echten Graniten", die durch teilweises Verschmelzen der Kontinentalkruste verursacht wurden. Abstract We report t]~e following new 4~ages: 180--150 and 90--100 Ma from monzodiorite and tremolite-actinolite schist of the Kohistan Complex; 44 + 0.5, 39.7 +-_ 0.2 Ma from dikes cutting the Ladakh-Deosai Batholith Complex; 130-145 Ma from a diorite in the Shyok melange; and 7.8 + 0.1 Ma from a late stage monzogranite of the Karakorum Batholith. A 261 ___ 13 Ma age from gneiss of the Karakornm Batholith is of uncertain significance.These dates, previously published ones which we summarize here, and some Sr isotope data suggest the following, (due to subduction switching between the Indian and Asian margins during closing of the Tethys ocean):Late Cretaceous emplacement of the Dras-Kohistan Cretaceous Island arc, followed by rapid cooling between abut 85 and 45 Ma.A quiet phase tectonically on the northern Indian plate during the Palaeocene to early Eocene, when subduction was occurring on the Asian margin. Further southward thrusting of the Indian continental margin associated with the development of an Andean-type arc (the Ladakh-Desosai Batholiths) on the northern Indian margin during the Eocene.An Oligocene Andean arc (the Karakorum Batholiths) on the Asian margin, followed by Miocene collision of the two continents and intrusion of 'true' granites derived from partial melting of continental crust. R&um6Nous raisons 6tat ici des nouvelles datations 4~suivantes Phase tranquille, sur le plan tect0nique, sur la plaque N. de l'Inde allant du Pal~o-c@ne h l'Eoc@ne ancien, lots de la subduction de la marge asiatique.Pouss@e vers le sud de la marge continentale de l'Inde associ@es au d6veloppement d'un arc de type andin (les batholites du Ladakh-Deosai) sur la marge N. de l'Inde l'Eocbne.Arc andin oligoc6ne (les batholites du Karakoram) sur la marge asiatique, suivi d'une collision au Mioc@ne des deux continents et de l'intrusion de << v@ritables >> granites provenant de la fonte partielle de la crofite continentale.

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Overview of the Geology, Structure, and Tectonics of the Ladakh Batholith and Indus Suture Rocks

Petterson

2023

Springer Geology

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Structural evolution of a crustal section in the western Himalaya

Cited by 46 publications

References 6 publications

Geochemistry of amphibolites from the southern part of the Kohistan arc, N. Pakistan

Geochemistry of amphibolites from the southern part of the Kohistan arc, N. Pakistan

The age and nature of Mesozoic-Tertiary magmatism across the Indus Suture Zone in Kashmir and Ladakh (N. W. India and Pakistan)

Overview of the Geology, Structure, and Tectonics of the Ladakh Batholith and Indus Suture Rocks

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