Late Cretaceous-Tertiary magmatic and tectonic events in the Transhimalaya batholith (Kailas area, SW Tibet)

Autor(en)

Christine Miller, Ralf Schuster, Urs Kloetzli, Wolfgang Frank

Abstrakt

Major and trace element, single zircon evaporation, Rb-Sr, Sm-Nd and 40Ar/39Ar data are presented for the igneous rocks of the Andean-type plutonic belt exposed along the southern margin of the Lhasa terrane in SW Tibet. The new data (1) show that the calc-alkaline plutonism is 80 Ma older than previously thought: it started as early as 119 Ma and lasted until about 40 Ma; (2) indicate a range of eruption ages for the associated volcanic rocks of c. 119 to 38 Ma; (3) document the involvement of mantle and crustal components in the genesis of these magmatic rocks: 87Sr/86Sr initial ratios range between 0.7035 and 0.7353; (4) suggest that the intrusion of plutons occurred at crustal depths of c. 0.27-0.65 GPa; (5) confirm and extend previously published models of Cretaceous-Tertiary magmatic and tectonic events: the plutons in the northern part of the batholith had cooled to below 300 °C by 90 Ma, probably due to thrust tectonics. The postcrystallization cooling history of the Kailas pluton in the southern part is characterized by cooling to below 500 °C and exhumation to the surface between 43-23 Ma, probably due to S directed thrusting along the Gangdese thrust. Reheating around 20 Ma documents the activity of the N directed Kailas thrust system.

Organisation(en)

Institut für Geologie

Externe Organisation(en)

Leopold-Franzens-Universität Innsbruck, Universität Wien

Journal

Schweizerische Mineralogische und Petrographische Mitteilungen: eine europäische Zeitschrift für Mineralogie, Geochemie und Petrographie

Band

80

Seiten

1-20

Anzahl der Seiten

20

ISSN

0036-7699

DOI

https://doi.org/10.5169/seals-60947

Publikationsdatum

2000

Peer-reviewed

Ja

ÖFOS 2012

105101 Allgemeine Geologie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/0adef242-68a8-46be-85ea-811a1a886359