Discovery of Upper Cretaceous Neo-Tethyan trench deposits in south Tibet (Luogangcuo Formation)

An, Wenling; Hu, Xiumian; Garzanti, Eduardo

doi:10.1130/l690.1

Cited by 20 publications

(34 citation statements)

References 91 publications

(171 reference statements)

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“…2). However, samples from turbidites in the Luogangcuo Formation appear qualitatively similar to our samples (An et al, 2018), suggesting that the coarse facies are likely a marginal or isolated trench slope basin equivalent of the Rongmawa Formation derived from local sources. Based on these provenance similarities and Late Cretaceous MDAs for all trench basin samples, we interpret that they comprised an interrelated trench basin (Fig.…”

Section: Discussionsupporting

confidence: 70%

“…A different trench basin unit (Luogangcuo Formation) exposed near Saga (Fig. 1) was also deposited during Late Cretaceous time (88-81 Ma; An et al, 2018). It is distinguished based on its conglomeratic composition and DZ age spectra that largely lack the >170 Ma age-probability peaks (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…110 and 51 Ma (An et al, 2014;Orme et al, 2015;Orme and Laskowski, 2016) and sedimentation in trench basins prior to ca. 85-70 Ma incorporation into the subduction-accretion complex (Cai et al, 2012;An et al, 2018;Wang et al, 2018;Metcalf and Kapp, 2019). Given that Lhasa terrane crystallization ages and isotopic compositions of igneous rocks (Zhu et al, 2011;Wang et al, 2016;Chapman and Kapp, 2017) and characteristic age spectra of sedimentary rocks (Gehrels et al, 2011) are well known, detrital zircon (DZ) geochronology is appropriate for determining sediment provenance.…”

Section: Introductionmentioning

confidence: 99%

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The Ancestral Lhasa River: A Late Cretaceous trans-arc river that drained the proto–Tibetan Plateau

Laskowski

Orme

Cai

et al. 2019

Geology

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Late Cretaceous trench basin strata were deposited in the subduction zone that consumed Neo-Tethyan oceanic lithosphere along the southern margin of the proto–Tibetan Plateau. We conducted detrital zircon (DZ) U-Pb geochronology on six trench basin samples (n = 1716) collected near Dênggar, Tibet (∼500 km west of Lhasa), to assess the provenance of these rocks and reconstruct Late Cretaceous sediment transport pathways. They contained DZ ages that point to a unique source around Lhasa city, north of the Late Cretaceous Gangdese magmatic arc. The modern Lhasa River catchment contains the requisite sources, and its main trunk transects the Gangdese magmatic arc, joining with the Yarlung River at a barbed junction at the India-Asia suture. We infer that the Lhasa River is an ancient feature that transported sediment to the subduction zone in Late Cretaceous time and persisted during India-Asia collision.

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Section: Discussionsupporting

confidence: 70%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Ancestral Lhasa River: A Late Cretaceous trans-arc river that drained the proto–Tibetan Plateau

Laskowski

Orme

Cai

et al. 2019

Geology

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“…This phenomenon is quite common in suture zones, such as the trench deposits of the Luogangcuo Formation (An et al, 2018) and the deep-sea turbidites in the Sangdanlin Section (Ding et al, 2005;DeCelles et al 2014;Hu et al, 2015Hu et al, , 2017 This Middle Jurassic Lhasa-Qiangtang initial collision time is coincident with that from a study in the southern Qiangtang basin in the Shuanghu area (Ma et al, 2017). Given these studies, it can be concluded that the Lhasa-Qiangtang initial collision occurred in Middle Jurassic time (~166 Ma) from Nima to Gaize along the BNSZ.…”

Section: Accepted Manuscriptsupporting

confidence: 52%

Discovery of Middle Jurassic trench deposits in the Bangong-Nujiang suture zone: Implications for the timing of Lhasa-Qiangtang initial collision

Sun

et al. 2019

Tectonophysics

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The Mesozoic trench deposits in the Bangong-Nujiang suture zone in central Tibet can provide critical information for reconstructing the paleotectonic evolution of the Bangong-Nujiang Ocean and constraining the timing of the Lhasa-Qiangtang initial collision. In this paper, the Gamulong Formation, which is well exposed in the Dong Co area, western Bangong-Nujiang suture, central Tibet, was studied. The sedimentological analysis shows that the Gamulong Formation was deposited in a submarine fan environment. The youngest detrital zircon age and fossils from limestone pebbles within the Gamulong Formation combine to determine a Middle Jurassic age. The pebbles in the conglomerate are dominated by limestones and sandstones, which is consistent with the sandstone petrology showing limestone and sandstone fragments as the main framework components. Detrital zircon U-Pb ages from the sandstones yield age populations of 164-178 Ma, 200-500 Ma, 700-1000 Ma, 1700-2100 Ma and ~2500 Ma. The corresponding zircon εHf(t) values are distributed between -23.5 and +11.1. These zircon features are similar to those from the Qiangtang terrane. Accordingly, the provenance results imply that the Gamulong Formation was recycled from the accretionary complex (Mugagangri Group mélange) in the Bangong-Nujiang suture zone and the forearc basin deposits (Lower-Middle Jurassic ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T 2 Sewa/Shaqiaomu/Jiebuqu formations) in the southern Qiangtang subterrane. The Gamulong Formation is characterized by sedimentary recycling in the trench, likely in response to a tectonic event (possibly the continental collision). Together with the previous studies, this work on the occurrence of the Gamulong Formation indicates that the Lhasa-Qiangtang initial collision could have occurred in Middle Jurassic time (~166 Ma).

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“…Thick‐bedded marbles indicate that protoliths of the Langxian unit could have been deposited in a shallow sea environment rather than in trench or trench‐slope basin. This is because trench or trench‐slope basin in the central YZSZ often comprises deep‐water deposits such as chert and turbiditic sandstone (An et al, 2018; Cai et al, 2012; Metcalf & Kapp, 2019; Wang et al, 2018) and receives detritus only sourced from magmatic arc, recycled accretionary wedge, or forearc sequences in the north (An et al, 2018; Cai et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Discovery of Vestige Sedimentary Archives of the India‐Asia Collision in the Eastern Yarlung Zangbo Suture Zone

Wei

et al. 2020

JGR Solid Earth

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The lack of syncollisional sediments in the eastern Yarlung Zangbo suture zone (YZSZ) has impeded our understanding of the India-Asia collision, particularly as to whether the collision was synchronous or diachronous. In this paper, we present evidence for the vestige sedimentary archives of the initial India-Asia collision retained in the previously proposed "Cretaceous Langxian Mélange" in the eastern YZSZ, southern Tibet. Field investigations of marbles and intercalated meta-siliciclastic rocks, together with analyses of petrography, cathodoluminescence image, geochronology, trace elements, and Nd isotopes show that (1) marbles occur as thin-bedded to massive individual layers consistently dipping to the south at 50-80°, (2) marble and intercalated meta-siliciclastic rocks exhibit the same deformational (foliations S 0 and S 1 ) and metamorphic (green-schist facies) history with nearly same detrital-zircon age spectra and ε Nd (0) values, (3) protoliths of the meta-sedimentary rocks were sourced from both India and Asia and deposited during the early Eocene, and (4) protoliths of the marbles were probably precipitated in a marine environment. These lines of evidence suggest that the previously proposed mélange is indeed not the Cretaceous mélange, but the vestige of syncollisional sedimentary strata that was originally deposited in situ in a syncollisional foreland basin. The estimated collisional age of prior to~56 Ma in the eastern YZSZ is almost consistent with the 60-56 Ma age estimated from the western-central YZSZ and Himalaya, indicating a (quasi-) synchronous initial India-Asia collision at~60-56 Ma.

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Discovery of Upper Cretaceous Neo-Tethyan trench deposits in south Tibet (Luogangcuo Formation)

Cited by 20 publications

References 91 publications

The Ancestral Lhasa River: A Late Cretaceous trans-arc river that drained the proto–Tibetan Plateau

The Ancestral Lhasa River: A Late Cretaceous trans-arc river that drained the proto–Tibetan Plateau

Discovery of Middle Jurassic trench deposits in the Bangong-Nujiang suture zone: Implications for the timing of Lhasa-Qiangtang initial collision

Discovery of Vestige Sedimentary Archives of the India‐Asia Collision in the Eastern Yarlung Zangbo Suture Zone

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