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Exploring the tectonostratigraphy of the Pakistan Himalaya with new detrital zircon geochronology and neodymium isotope data from the Kaghan Valley

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Geoscience Frontiers 2023年第6期14卷 117-132页

作者： W.Joel Schiffer Delores M.Robinson Shah Faisal Harold H.Stowell Department of Geological Sciences and Center for Sedimentary Basin Studies University of AlabamaPO Box 870338TuscaloosaAL 35487USA National Centre of Excellence in Geology University of PeshawarPeshawar 25130Pakistan

In the central Himalaya,the Greater and Lesser Himalayan tectonostratigraphic zones can be distinguished from each other by combining detrital zircon U-Pb ages and whole-rock Nd isotopic *** the Hazara-Kashmir syntaxis of northern Pakistan,rock units in the Kaghan valley have been variously assigned to the Tethyan,Greater,and Lesser Himalayan *** determine which tectonostratigraphic zones are represented,we sampled across the Batal thrust in the northern Kaghan valley because this structure is identified in some research as the main central *** from the footwall yield Paleo-to Mesoproterozoic maximum depositional ages(-1.8-1.1 Ga)and an averageεNd(0)value *** from the hanging wall yield Neoproterozoic maximum depositional ages(~1000-600 Ma)andεNd(0)values *** contrasting detrital zircon ages show that the Batal thrust in the Kaghan valley is a major structural ***,these data lack the characteristic detrital zircon age spectra andεNd(0)values of Greater and Lesser Himalayan rocks north and south of the main central thrust in the central Himalaya,***,either the Batal thrust is not the main central thrust,or the main central thrust in the Kaghan valley cuts a different structural level and carries rock units not seen outside the Hazara-Kashmir syntaxis.

关键词： Pakistan Himalaya Tectonostratigraphy main central thrust Detrital zircon geochronology Neodymium isotopes

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Tectono-metamorphic discontinuities in the Greater Himalayan Crystalline,central Himalaya

Tectono-metamorphic discontinuities in the Greater Himalayan...

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2018年中国地球科学联合学术年会

作者： Gautam Khanal Jia-Min Wang Fu-Yuan Wu Jiang-Gang Wang Yang Lei 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室

The Himalayan Metamorphic Core in the central Nepal Himalaya can be separated into the Lesser Himalayan Sequence(LHS),the Lower Greater Himalayan Crystalline(GHC) and the Upper GHC by tectono-metamorphic *** nature and evolution of these discontinuities are vital to understand the Himalayan convergence accommodation *** petrochronology combined with geothermobarometry have revealed existence of two tectono-metamorphic discontinuities within the Himalayan Metamorphic core in Rasuwa-Gadhi section,central *** pressures and temperatures were determined by conventional thermobarometry and Zr-in-Rutile *** LHS in the study area has P–T conditions of 30℃/km in the upper GHC).The lower discontinuity(rise in P-T) and the upper discontinuity(jump in T/depth) can be correlated with the main central thrust and the Langtang thrust,*** Th – Pb ages in metapelite range from 36 to 13 Ma and are linked to metamorphic conditions on the basis of trace elements,mineral inclusions and mineral *** prograde monazite growth in the upper GHC rocks continued at least until 27 Ma,whereas retrograde cooling occurred during 20–15 Ma,which is supported by REE patterns showing feldspar growth and garnet breakdown after 22 *** the lower GHC,the prograde monazite growth lasted until around 15 *** combining prograde and retrograde monazite ages in the immediate hanging wall and footwall,initial active timing of the Langtang thrust and main central thrust in the Rasuwa Gadhi section is constrained to be ～22 Ma and ～15 Ma,*** data support the tectonic model that in-sequence thrusting is responsible for the diachronous burial and exhumation of the high-grade Himalayan Metamorphic Core.

关键词： Himalayan Metamorphic Core Tectono-metamorphic discontinuities main central thrust geothermobarometry Monazite petrochronology

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