Leucogranites in Lhozag, southern Tibet: Implications for the tectonic evolution of the eastern Himalaya

Huang, C. C.; Zhao, Zhidan; Li, Guangming; Zhu, Di‐Cheng; Liu, Dong; Shi, Qingshang

doi:10.1016/j.lithos.2017.09.014

Cited by 42 publications

(22 citation statements)

References 90 publications

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“…The potential sources of Siwalik sediments exposed along the Mohand‐Rao and Haripur‐Khol sections are rocks of the THS, GHS, oLHS, and iLHS. We compiled published zircon U‐Pb ages from these sources in the northwestern Indian and Nepalese Himalayas (Cawood et al, ; Colleps et al, ; Ding et al, ; Gehrels et al, ; Hou et al, ; Huang et al, ; Liu et al, , ; Mandal et al, 2015, ; McKenzie et al, ; Myrow et al, , ; Rubatto et al, ; Spencer et al, ; Webb et al, ; Zheng et al, ; the complete data set is provided in the supporting information Table S10) to create reference age spectra for identifying the provenance of the studied sediments. This compilation shows that the THS, GHS, and oLHS rocks have indistinguishable age spectra, except for a distinctively large ~1,800‐Ma peak in the oLHS (Figure ).…”

Section: Provenance Constraints From Geochronological and Isotopic Datamentioning

confidence: 99%

Multiproxy Isotopic and Geochemical Analysis of the Siwalik Sediments in NW India: Implication for the Late Cenozoic Tectonic Evolution of the Himalaya

et al. 2019

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Provenance analysis of the Sub-Himalayan Late Miocene-Pleistocene foreland basin deposits (Siwaliks) from the Dehradun reentrant area provides a 10-Myr long record of the denudation history and tectonic evolution of the northwestern Indian Himalaya. We studied Siwalik sediments exposed along the Mohand-Rao and Haripur-Khol sections, using detrital zircon U-Pb geochronology, major and trace elements, and Sr-Nd isotope geochemistry. Results suggest that the erosion pattern has been relatively stable since the Late Miocene with sediments derived from the Tethyan Himalayan (THS), Greater Himalayan (GHS), and outer-(oLHS) and inner-Lesser Himalayan (iLHS) sequences. Provenance data indicate that erosional unroofing of the Lesser Himalayan Crystalline sequences (LHCS) initiated around 6 Ma, possibly related to out-of-sequence movement of the Ramgarh-Munsiari Thrust. Our data also suggest erosional recycling of older foreland basin deposits into younger Siwaliks since~5.5 Ma, which may indicate the time of thrust propagation from the Lesser Himalaya into the foreland basin. While the iLHS has been exposed to erosion since at least~10 Ma, the Siwaliks were dominated by materials derived from the GHS and THS sources. We interpret these results as an indication that tectonic uplift and erosion of the orogenic wedge occurred in response to duplexing of the iLHS and concomitant high topography and rock uplift rate in the Greater and Tethyan Himalaya. Comparing the provenance of the Siwalik sediments with that of the modern Ganga and Yamuna river sediments further indicates that deposition during the Late Cenozoic was most likely accomplished by southward flowing transverse Himalayan rivers, analogous to the modern ones.

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Section: Provenance Constraints From Geochronological and Isotopic Datamentioning

confidence: 99%

Multiproxy Isotopic and Geochemical Analysis of the Siwalik Sediments in NW India: Implication for the Late Cenozoic Tectonic Evolution of the Himalaya

et al. 2019

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“…Previous studies suggested that the leucogranites were mainly emplaced between ca. 28 and 8 Ma (Carosi, Montomoli, Rubatto, & Vison, 2013;Gou et al, 2016;Guo & Wilson, 2012;Huang et al, 2017;Searle & Godin, 2003). However, recent investigations identified some older leucogranites in the Yardoi Gneiss Dome (ca.…”

Section: Geological Background and Sample Descriptionsmentioning

confidence: 99%

“…Thus, the Sr-Nd-Pb-Hf isotopes collectively indicate that the magma source was composed of ancient Himalayan basement rocks. 198 It is generally accepted that the HHLs were derived from metamorphic mudstones of the HHCS (Guo et al, 2007;Harris & Inger, 1992;Harrison et al, 1999;Huang et al, 2017), whereas the source of the THLs remains controversial (Tian et al, 2018). Potential source materials for the THLs include: (1) the HHCS (Huang et al, 2017;Xie et al, 2018); (2) a mixture between the LHS and HHCS (Guo & Wilson, 2012); and (3) metasedimentary units of the THS (Aikman et al, 2008;King, Harris, Argles, Parrish, & Zhang, 2011).…”

Section: Source Featuresmentioning

confidence: 99%

“…Moreover, the Himalya is well-known for the most extensive distribution of leucogranites (44-7 Ma) on Earth (Wu, Liu, Liu, & Ji, 2015). A large number of studies have shown that Oligocene-Miocene leucogranites (most leucogranites in Himalaya) were derived from partial melting of metasedimentay rocks (Wu et al, 2015;Huang et al, 2017., Xie et al, 2018), whereas Eocene leucogranites (granites in Yardoi area) were mostly likely originated from metabasalts (Qi, Zeng, Meng, Xu, & Li, 2008;Xie et al, 2010;Hou et al, 2012;Zeng et al, 2011Zeng et al, , 2014. However, Tian, Wang, Zheng, and Yang (2018) suggested that the Liemai Early Eocene intrusion (48.5±1.1 Ma), in the Yardoi area, was derived from a clay-mineral-rich source region.…”

Section: Introductionmentioning

confidence: 99%

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Crustal thickening prior to 43 Ma in the Himalaya: Evidence from lower crust‐derived adakitic magmatism in Dala, eastern Tethyan Himalaya, Tibet

Dai

Dong

et al. 2019

Geological Journal

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The Himalayan-Tibetan orogen is the world's largest active orogen with the thickest continental crust on Earth. However, the timing of crustal thickening of this orogen remains controversial. In recent years, magmatic rocks with adakitic affinities have been widely used to constrain the crustal thickness. Here, we present zircon U-Pb ages, geochemical and Sr-Nd-Pb-Hf isotopic data for the Dala two-mica granites (eastern Tethyan Himalaya) that may shed light on this issue. Zircon U-Pb dating shows that the Dala two-mica granites were emplaced at ca. 43 Ma. The granites display adakitic signatures, including high SiO 2 , Al 2 O 3 and Sr contents, low Y and Yb contents with high Sr/Y (27−67) and La/Yb (35−99) ratios. High K 2 O and Th contents, low Nb/U, Ce/Pb, Ti/Eu and Nd/Sm ratios and low MgO, Mg#, Cr and Ni contents suggest that the Dala two-mica granites were derived from partial melting of a thickened lower crust. Low negative zircon ε Hf (t) values (−10.4 to −0.5) with old two-stage Hf model ages (1.1-1.8 Ga), high ( 87 Sr/ 86 Sr) i (0.715861-0.717665) with low ε Nd (t) (−12.5 to −11.3) and high Pb isotopes [( 206 Pb/ 204 Pb) i =18.783-18.861, ( 207 Pb/ 204 Pb) i =18.783-18.861 and ( 208 Pb/ 204 Pb) i =39.052-39.285], together with previous literature data, indicate that the magma source for the Eocene granites in the Yardoi area was composed of ancient lower crust consisting mainly of garnetamphibolite and probably subordinate metapelites of the High Himalayan Crystalline Sequence. The residual mineral assemblage of garnet + rutile + plagioclase ± amphibole in the source region demonstrates that the crust beneath the Himalaya could have been thickened to 50 km in the Eocene. Combining with previous studies, we propose that the Eocene magmatic rocks in the Tethyan Himalaya (e.g. ca. 43 Ma old Dala two-mica granites) can be best interpreted as the consequence of breakoff of the Neo-Tethyan oceanic slab.

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“…The research on the leucogranite would help to verify and improve the continent-continent collision orogenic theory. (Huang et al, 2017;Fig. 1a).…”

Section: Objectivementioning

confidence: 99%

Zircon U‐Pb Dating of Leucogranite in Lhozag and Its Geological Significance

Guo

Huang

Shi

et al. 2018

Acta Geologica Sinica (Eng)

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Leucogranites in Lhozag, southern Tibet: Implications for the tectonic evolution of the eastern Himalaya

Cited by 42 publications

References 90 publications

Multiproxy Isotopic and Geochemical Analysis of the Siwalik Sediments in NW India: Implication for the Late Cenozoic Tectonic Evolution of the Himalaya

Multiproxy Isotopic and Geochemical Analysis of the Siwalik Sediments in NW India: Implication for the Late Cenozoic Tectonic Evolution of the Himalaya

Crustal thickening prior to 43 Ma in the Himalaya: Evidence from lower crust‐derived adakitic magmatism in Dala, eastern Tethyan Himalaya, Tibet

Zircon U‐Pb Dating of Leucogranite in Lhozag and Its Geological Significance

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