Lithofacies, microfacies and depositional environments of Upper Cretaceous Oceanic red beds (Chuangde Formation) in southern Tibet

Chen, Xin; Wang, Chengshan; Kuhnt, Wolfgang; Holbourn, Ann; Huang, Yongjian; Ma, Changqian

doi:10.1016/j.sedgeo.2010.06.008

Cited by 24 publications

(9 citation statements)

References 28 publications

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“…Also, the Indian sub‐continent's breakout phase (132 Ma to around 110 Ma; the geological instant when Indo‐Madagascar and Australia–Antarctica had fully disconnected), may have led to development of a series of half grabens on the NE corner of India adjacent to the Wallaby–Zenith Fracture Zone. We note sedimentological investigations from the southern Tibet (Liu, ; Liu & Einsele, ; Li et al ., ; Hu et al ., ; Chen et al ., ) provide support for this hypothesis.…”

Section: Discussionmentioning

confidence: 57%

Greater India's northern margin prior to its collision with Asia

Ali

Aitchison

2014

Basin Research

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Greater India's northern edge prior to collision with Asia is typically modelled as a rifted passive margin. We argue for a quite different geometry as a consequence of two tectonic episodes that happened sometime before the main impact. Whilst the western segment of India's northern boundary had formed in the Late Triassic as a rifted margin, the central and eastern portions developed between 132 and 110 Ma when the sub‐continent separated from Australia–Antarctica as the inner wall of a dextral ‘scything’ transform fault along the Wallaby–Zenith Fracture Zone off western Australia. Key features would have been (i) the very narrow (20–30 km wide) ocean–continent transition zone marking the sub‐continent's eastern northern boundary, and (ii) similar to the region offshore South Africa's Garden Route coast, Greater India's NE corner may have developed a series of ‘perched’ half grabens due to shearing related to its motion along the Wallaby–Zenith Fracture Zone, from initial break‐up until it passed the Zenith Plateau (ca. 110 Ma). Differences in the development of NW Greater India may be reflected in restriction of ultra‐high pressure metamorphic rocks to the western Himalaya where late Paleocene subduction of the rifted passive margin occurred at sub‐equatorial latitudes beneath the intra‐Tethyan arc. Further east, where the margin developed along the scything transform, the continent–ocean boundary would have been more abrupt and probably less strongly welded. Ophiolite emplacement appears to have been penecontemporaneous along the margin. A subsequent slab break‐off episode then eliminated the original plate boundary. Thereafter, remaining oceanic lithosphere north of the arc sutured to the sub‐continent, albeit rather weakly, was consumed beneath Eurasia, culminating in India–Asia collision.

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Section: Discussionmentioning

confidence: 57%

Greater India's northern margin prior to its collision with Asia

Ali

Aitchison

2014

Basin Research

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“…The lower and middle parts of the Cailangba B section were dated to be 76.2–75.7 Ma by planktonic foraminifers, which yielded a middle Campanian age for the Cailangba B section (Supplementary Fig. 2) [ 32 ]. Hence, the reverse polarity R1 and normal polarity N2 magnetozones in the Cailangba B section are correlated to chron C32r.2r (74.3–74.0 Ma) and the upper part of chron C33n (79.9–74.3 Ma), respectively.…”

Section: Resultsmentioning

confidence: 99%

“…(c) The studied Cailangba section, simplified from Chen et al. [ 32 ]. (d) The studied Sangdanlin and Mubala sections.…”

Section: Introductionmentioning

confidence: 99%

Rapid drift of the Tethyan Himalaya terrane before two-stage India-Asia collision

Yuan

Yang

Deng

et al. 2020

National Science Review

100

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The India-Asia collision is an outstanding smoking gun in the study of continental collision dynamics. How and when the continental collision occurred remains a long-standing controversy. Here we present two new paleomagnetic data sets from rocks deposited on the distal part of the Indian passive margin, which indicate that the Tethyan Himalaya terrane was situated at a paleolatitude of ∼19.4°S at ∼75 Ma and moved rapidly northward to reach a paleolatitude of ∼13.7°N at ∼61 Ma. This implies that the Tethyan Himalaya terrane rifted from India after ∼75 Ma, generating the North India Sea. We document a new two-stage continental collision, first at ∼61 Ma between the Lhasa and Tethyan Himalaya terranes, subsequently at ∼53−48 Ma between the Tethyan Himalaya terrane and India, diachronously closing the North India Sea from west to east. Our scenario matches the history of India-Asia convergence rates and reconciles multiple lines of geologic evidence for the collision.

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“…These negative values could suggest either: (a) an increased input of terrestrial soil given soil has negative Δ 199 Hg (Biswas et al, 2008;Demers et al, 2013;Yin et al, 2013), or (b) a decrease in atmospheric Hg(II) deposition and hence a proportionate increase in soil Hg. A previous study by Chen et al (2011) reported Chemical Index of Alteration values of the Gyabula Formation (66.1 ± 3.9, SD) and the Chuande Formation (69.6 ± 4.8, SD, SD) are similar, suggesting that a significantly increased input of terrestrial material seems unlikely. Weakened volcanic activity better supports the observed data.…”

Section: Hg-mif Constrains Hg Sources To the Late Cretaceous Oceanmentioning

confidence: 76%

Volcanism‐Triggered Climatic Control on Late Cretaceous Oceans

Sun

Yao

Deng

et al. 2022

Geochem Geophys Geosyst

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During the Late Cretaceous, Earth's climate oscillated between warm and cool states, and global oceans changed between anoxic and oxic conditions, resulting in black/gray shales and oceanic red beds (ORBs) deposition, respectively. To understand such climate/ocean dynamics, this study investigated bulk Hg and Hg isotopes, as well as Fe3+/Fe2+ in Upper Cretaceous sediments deposited in southern Tibet and the North Atlantic. In both areas, black/gray shales show much higher Hg concentrations than ORBs, indicating enhanced Hg flux to global oceans during time of black/gray shale deposition. Black/gray shales show lower Fe3+/Fe2+ and positive Δ199Hg, suggesting a significant input of Hg into the anoxic/dysoxic ocean via atmospheric deposition. The isotope values are consistent with a volcanic source for this excess Hg. ORBs show high Fe3+/Fe2+ and negative shifts of Δ199Hg, suggesting that the dominant source of Hg into the oxic oceans was via terrestrial runoff. This study suggests that volcanism was an important driver of the climate/ocean dynamics during the Late Cretaceous.

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Lithofacies, microfacies and depositional environments of Upper Cretaceous Oceanic red beds (Chuangde Formation) in southern Tibet

Cited by 24 publications

References 28 publications

Greater India's northern margin prior to its collision with Asia

Greater India's northern margin prior to its collision with Asia

Rapid drift of the Tethyan Himalaya terrane before two-stage India-Asia collision

Volcanism‐Triggered Climatic Control on Late Cretaceous Oceans

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