Southern Tibetan Oligocene–Miocene adakites: A record of Indian slab tearing

Zhang, Li Yun; Ducea, Mihai N.; Ding, Lin; Pullen, Alex; Kapp, Paul; Hoffman, Derek

doi:10.1016/j.lithos.2014.09.029

Cited by 67 publications

(34 citation statements)

References 129 publications

(262 reference statements)

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“…13 Ma also contain inherited zircons with ages of 60.2, 31.3, and 25.6 Ma (Tables S1, S2). These inherited zircons are broadly consistent with the predominantly intrusive stages of the Gangdese batholith, which indicates the continuous subduction of Indian lithosphere after break-off of the Neo-Tethyan slab Pan et al, 2012;Wen et al, 2008;Zhang et al, 2014). During this time, the Lhasa Terrane changed from an extensional to a compressional domain.…”

Section: Tectonic Significancementioning

confidence: 54%

Two Cenozoic tectonic events of N–S and E–W extension in the Lhasa Terrane: Evidence from geology and geochronology

Huang

Chen

et al. 2016

Lithos

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Section: Tectonic Significancementioning

confidence: 54%

Two Cenozoic tectonic events of N–S and E–W extension in the Lhasa Terrane: Evidence from geology and geochronology

Huang

Chen

et al. 2016

Lithos

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“…Coeval granitic intrusions were also found in other locations around the Yaja granodiorite ( Figure 1b) and dated by Ar-Ar and zircon U-Pb methods [46][47][48][49][50]76]. The geochemical compositions of these plutons show adakitic affinities, with high SiO 2 , K 2 O, and Sr, but low Y and Yb contents [43,47,49,50,61]. Combined with other Late Oligocene-Miocene (ca.…”

Section: 3~30 Ma Magmatism In Southern Tibetmentioning

confidence: 83%

“…In the former case, assuming that there are no~30 Ma intrusive rocks in the Luobusa area, the fluids most probably come from the nearest adakitic intrusions west of Luobusa. The nearest reported pluton is the Sangri granodiorite, which intruded the rocks of the Yarlung-Zangbo suture zone and has a crystallization age of 29.6 ± 0.4 Ma (Figure 1b) [49]. Thick Cretaceous sedimentary rocks in the area, especially siltstone and tuff, can effectively obstruct hydrothermal fluids and result in lateral flow, as indicated by the linear distribution of hydrothermal mineralization [76].…”

Section: Possible Circulating Ways Of the Fluidsmentioning

confidence: 99%

“…On the basis of the linear distribution of post-collisional adakitic intrusions along the south edge of Gangdese batholith, and especially the fact that the late Oligocene plutonism occurred extensively in the Zedong area [43,[45][46][47][48][49][50]76] west of Luobusa and in the Gyaca area east of Luobusa, it is reasonable to speculate the existence of coeval plutonism in the local Luobusa area. The newly found gold enrichment in the Luobusa listwanites [28] also supports such a speculation, which may extend the Kelu-Liebu-Chongmuda ore-forming sub-belt father to the east.…”

Section: Possible Circulating Ways Of the Fluidsmentioning

confidence: 99%

“…(b) Geological map of the study area (Zedong-Luobusa), modified from Aitchison et al [44]. The ~30 Ma intrusives are marked on the map based on references [43,[45][46][47][48][49][50]. RZT = Renbu-Zedong thrust.…”

Section: Introductionmentioning

confidence: 99%

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Timing of Secondary Hydrothermal Alteration of the Luobusa Chromitites Constrained by Ar/Ar Dating of Chrome Chlorites

Guo

et al. 2018

Minerals

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Chrome chlorites are usually found as secondary phases formed by hydrothermal alteration of chromite deposits and associated mafic/ultramafic rocks. Here, we report the 40 Ar/ 39 Ar age of chrome chlorites separated from the Luobusa massive chromitites which have undergone secondary alteration by CO 2 -rich hydrothermal fluids. The dating results reveal that the intermediate heating steps (from 4 to 10) of sample L7 generate an age plateau of 29.88 ± 0.42 Ma (MSWD = 0.12, plateau 39 Ar = 74.6%), and the plateau data points define a concordant inverse isochron age of 30.15 ± 1.05 Ma (MSWD = 0.08, initial 40 Ar/ 36 Ar = 295.8 ± 9.7). The Ar release pattern shows no evidence of later degassing or inherited radiogenic component indicated by an atmospheric intercept, thus representing the age of the hydrothermal activity. Based on the agreement of this hydrothermal age with the~30 Ma adakitic plutons exposed in nearby regions (the Zedong area, tens of kilometers west Luobusa) and the extensive late Oligocene plutonism distributed along the southeastern Gangdese magmatic belt, it is suggested that the hydrothermal fluids are likely related to the~30 Ma magmatism. The hydrothermal fluid circulation could be launched either by remote plutons (such as the Sangri granodiorite, the nearest~30 Ma pluton west Luobusa) or by a similar coeval pluton in the local Luobusa area (inferred, not found or reported so far). Our results provide important clues for when the listwanites in Luobusa were formed.

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India‐Asia convergence: Insights from burial and exhumation of the Xigaze fore‐arc basin, south Tibet

Kohn

Sandiford

et al. 2017

JGR Solid Earth

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The composite fore‐arc/syncollisional Xigaze basin in south Tibet preserves a key record of India‐Asia collision. New apatite fission track and zircon (U‐Th)/He data from an N‐S transect across the preserved fore‐arc basin sequence near Xigaze show a consistent northward Late Cretaceous to middle Miocene younging trend, while coexisting apatite (U‐Th‐Sm)/He ages are all Miocene. Corresponding detrital zircon U‐Pb data are also reported for constraining the Cretaceous depositional ages of the Xigaze basin sequence in the region. Thermal history modeling indicates that the basin experienced northward propagating episodic exhumation, along with a northward migration of the depocenter and a pre‐existing Cenozoic syncollisional basin sequence which had been removed. In the southern part, fore‐arc exhumation commenced in the Late Cretaceous (~89 ± 2 Ma). Following transition to a syncollisional basin in the Paleocene, sedimentation in the central and northern Xigaze basin continued until the latest Eocene (~34 ± 4 Ma). Ongoing folding and thrusting (e.g., Great Counter Thrusts) caused by progressive plate convergence during late Oligocene‐early Miocene time resulted in regional uplift and considerable basin denudation, which fed two fluvial basins along its northern and southern flanks and exposed the basement ophiolite. Subsequent incision of the Yarlung River resulted in Miocene cooling in the region. Different episodes in the exhumation history of the Xigaze basin, caused by thrusting of an accretionary wedge and ophiolitic basement, can be linked to changes in India‐Asia convergence rates and the changing subduction pattern of the Indian and Neo‐Tethyan slabs.

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Southern Tibetan Oligocene–Miocene adakites: A record of Indian slab tearing

Cited by 67 publications

References 129 publications

Two Cenozoic tectonic events of N–S and E–W extension in the Lhasa Terrane: Evidence from geology and geochronology

Two Cenozoic tectonic events of N–S and E–W extension in the Lhasa Terrane: Evidence from geology and geochronology

Timing of Secondary Hydrothermal Alteration of the Luobusa Chromitites Constrained by Ar/Ar Dating of Chrome Chlorites

India‐Asia convergence: Insights from burial and exhumation of the Xigaze fore‐arc basin, south Tibet

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