Provenance analysis of Late Triassic turbidites in the eastern Songpan–Ganzi Flysch Complex: Sedimentary record of tectonic evolution of the eastern Paleo-Tethys Ocean

Gong, Daxing; Wu, Chen; Zou, Hao; Zhou, Xiong; Zhou, Yu; Tan, Hongqi; Xiangyuan, Yue

doi:10.1016/j.marpetgeo.2021.104927

Cited by 23 publications

(5 citation statements)

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“…To the north, in the Songpan‐Ganzi Terrane, the Late Triassic was likewise marked by deformation (∼230−200 Ma; Harrowfield & Wilson, 2005) and the initiation of non‐marine deposition. Other sedimentologic evidence of a Late Triassic collision include the appearance of Late Triassic (Rhaetian palynological age) molasse unconformably above Early−Middle Triassic rocks along the northern margin of the EQT—which has been attributed to the development of a foreland basin associated with collision of the EQT against Songpan‐Ganzi Terrane (BGMRXAR, 1993; Y. Li et al., 2003)—and the initiation of sediment mixing between those terranes already by Carnian time (Ding et al., 2013; Gong et al., 2021). Looking further afield, G. C. Zhao et al.…”

Section: Discussionmentioning

confidence: 99%

“…Other sedimentologic evidence of a Late Triassic collision include the appearance of Late Triassic (Rhaetian palynological age) molasse unconformably above Early−Middle Triassic rocks along the northern margin of the EQT-which has been attributed to the development of a foreland basin associated with collision of the EQT against Songpan-Ganzi Terrane (BGMRXAR, 1993;Y. Li et al, 2003)-and the initiation of sediment mixing between those terranes already by Carnian time (Ding et al, 2013;Gong et al, 2021). Looking further afield, G. C. Zhao et al (2018) recently presented a regional geologic synthesis arguing that the East Kunlun (to the north of the Jinshajiang Suture Zone) and the Mianlue-Qinling and Dabie-Sulu areas (to the east) all signify closure of the regional Mianlue (e.g., Paleo-Jinshajiang) Ocean at ∼240-220 Ma.…”

Section: Insights Into the Closure Time Of The Paleo-jinshajiang Oceanmentioning

confidence: 99%

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New Paleomagnetic and Chronological Constraints on the Late Triassic Position of the Eastern Qiangtang Terrane: Implications for the Closure of the Paleo‐Jinshajiang Ocean

Yan

Domeier

et al. 2022

Geophysical Research Letters

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The tectonic evolution of the Paleo‐Jinshajiang Ocean, and in particular the time of its closure, is debated. Here we present new constraints on the evolution of this region from an integrated paleomagnetic and geochronologic study of the Late Triassic Batang Group volcanic rocks in Qamdo, Eastern Qiangtang Terrane (EQT). Two zircon U‐Pb ages indicate that the volcanic rocks erupted at ∼227–222 Ma. New paleomagnetic results yield a robust Late Triassic paleopole of 57.6°N, 176.4°E (A95 = 7.8°), corresponding to a paleolatitude of 32.5 ± 7.8°N for the study area. Integrated with other lines of paleomagnetic and geological evidence, we show that the northward drift of the EQT placed it at the same paleolatitude as the Tarim Block by ∼227–222 Ma, which suggests that the Paleo‐Jinshajiang Ocean in the Qamdo region closed before that time, and likely around ∼230 Ma.

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Section: Discussionmentioning

confidence: 99%

Section: Insights Into the Closure Time Of The Paleo-jinshajiang Oceanmentioning

confidence: 99%

New Paleomagnetic and Chronological Constraints on the Late Triassic Position of the Eastern Qiangtang Terrane: Implications for the Closure of the Paleo‐Jinshajiang Ocean

Yan

Domeier

et al. 2022

Geophysical Research Letters

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“…On the Kernal Density Estimate diagrams of detrital zircon U–Pb ages (Figure 10), the upper Tumugou and Lamaya formations in this study have similar model with the Middle and Upper Triassic strata of the South Songpan‐Ganze Micro‐block and the southern part of eastern Yidun Micro‐block, indicating that they shared a similar provenance during the Late Triassic. Westward and northward palaeocurrent directions (Figure 1) and comparison of detrital zircon U–Pb ages imply that the source rocks of the South Songpan‐Ganze Micro‐block were possibly shed from the South China Block to the east and the Yidun and Qiangtang micro‐blocks to the south (Gong et al, 2021; Jian et al, 2019; Weislogel et al, 2010).…”

Section: Interpretation and Discussionmentioning

confidence: 99%

Late Triassic foreland basin and Early Palaeozoic basement in the eastern Yidun Micro‐block and its tectonic implications for the eastern Palaeo‐Tethys

Xia

Chen

et al. 2021

Geological Journal

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Subduction polarity and collisional process are still controversial in the eastern Palaeo‐Tethys. On the basis of 1:50,000‐scale geological mapping at the Heni Township, zircon U–Pb geochronology and whole‐rock geochemistry were analysed for volcano‐sedimentary rocks in the eastern Yidun Micro‐block, Qinghai‐Tibet Plateau. Early Palaeozoic sequences were reported firstly in the eastern Yidun Micro‐block. Two populations of detrital zircon U–Pb ages (~525 Ma and 800–1,250 Ma) and deformation and metamorphic characteristics imply that the Early Palaeozoic sequences were deposited during the Cambrian to Silurian in the South China Block. The Early Palaeozoic sequences in the eastern Yidun Micro‐block were extruded by Cenozoic NW‐SE strike‐slip faults. Both the Late Triassic upper Tumugou and Lamaya formations yield four prominent peak ages of ~260 Ma, ~450 Ma, 750 ~ 780 Ma, and ~1,850 Ma. U–Pb ages of youngest detrital zircons (226.2 ± 1.0–224.7 ± 1.1 Ma), uppermost andestic tuff (216.1 ± 0.3 Ma) and intruded granitoids (~215 Ma) show that both the upper Tumugou and Lamaya formations were deposited during 225 ~ 216 Ma. Whole‐rock geochemistry indicates that all sandstone samples underwent moderate weathering and strong sorting and recycling. They were derived from felsic provenance, like volcano‐sedimentary rocks and granitoids in the western Yidun and Qiangtang micro‐blocks, indicative of pre‐Norian closure of the Jinshajiang Ocean. The closure gave rise to a foreland basin filled by the 225–216 Ma volcano‐sedimentary rocks in the eastern Yidun Micro‐block. The closure of the Jinshajiang Ocean also led to a scissor‐like closure of the Ganze‐Litang Ocean by clockwise rotation. Combining these with previous work, the Ganze‐Litang Ocean was a back‐arc basin resulted from eastward subduction of the Jinshajiang Ocean and had not undergone oceanic subduction.

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“…From the end of the Late Triassic to the Early Jurassic, most flysches were intensely folded and uplifted (Burchfiel et al, 1995), which is associated with the amalgamation involving the Qiangtang block and accompanied by synchronous east-directed emplacement of the Longmenshan orogenic belt (Chen et al, 1995). The Songpan-Ganzi Triassic flysch has a multiprovenance origin with peak zircon ages of 265 Ma, 440 Ma, 740 Ma, 1,860, andca.2,450 Ma (Weislogel et al, 2006, 2010;Enkelmann et al, 2007;Deng et al, 2008;Ding et al, 2013;Zhang et al, 2014;Tang et al, 2017;Jian et al, 2019;Gong et al, 2021), and experienced low-to medium-grade greenschist facies metamorphism during the Late Triassic-Early Jurassic (BGMRSP, 1991;Dirks et al, 1994;Brugier et al, 1997;Huang et al, 2003;Wilson et al, 2006;Roger et al, 2010). In contrast, the underlying upper Sinian-Palaeozoic sequences, predominantly composed of carbonates, experienced higher-grade, medium-pressure metamorphism (Huang et al, 2003).…”

Section: Songpan Ganzi Fold Belt (Spgz)mentioning

confidence: 99%

Mid-cretaceous rapid denudation of Eastern Tibetan plateau: Insights from detrital records at the Southwestern corner of Sichuan basin

Wang

Li²,

Ran³

et al. 2023

Front. Earth Sci.

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Reconstruction of the Cretaceous tectonic evolution of the eastern margin of the Tibetan Plateau is of great significance to understanding the formation and early evolution of the Tibetan Plateau. The thick late Mesozoic sedimentary sequence in the Western Sichuan Basin may record the evolution of the basin itself and the tectonic uplift history of the eastern margin of the Tibetan Plateau during the Cretaceous period. Here we provide new multi-proxy provenance data from conglomerate clast populations, sandstone petrography, heavy mineral assemblages, U-Pb dating of detrital zircon, paleocurrent data, and detrital garnet geochemistry from the Cretaceous clastic units in the southwest corner of Sichuan Basin. Our analysis reveals two distinct changes in sediment provenance recorded in the Cretaceous strata at the southwest corner of the Sichuan Basin. The first significant change of detrital provenance was identified in the mid-Cretaceous Jiaguan Formation. Metamorphic rocks and volcanic rocks clast, as well as feldspar and mica, increased significantly, a heavy mineral assemblage dominated by hematite–limonite and ilmenite with high ATi and RuZi and low ZTR values, predominantly type Bi garnet and mostly 164 Ma, 207 Ma, 440 Ma, 780 Ma–824 Ma, and 1840 Ma detrital zircon ages, interpreted to be sourced from the Songpan-Ganzi fold belt and Longmenshan orogenic belt. The second shift, in the Guankou Formation, is marked by a low compositional maturity, a distinct increase in fossiliferous carbonate clasts and high GZi index with type Bii garnet, and Triassic zircon ages, indicating the exhumation of Longmenshan orogenic belt during the late Cretaceous. These data collectively indicate that the significant surface uplift and rapid denudation of the eastern margin of the Tibetan Plateau were probably initiated in the mid-Cretaceous (∼120 Ma). In conclusion, a detailed hands-on provenance analysis of the clastic sedimentary sequences in the southwest corner of the Sichuan Basin enabled us to determine catchment areas and shifts hitherto unstudied, thus contributing to the exhumation history of the eastern margin of the Tibetan Plateau.

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Provenance analysis of Late Triassic turbidites in the eastern Songpan–Ganzi Flysch Complex: Sedimentary record of tectonic evolution of the eastern Paleo-Tethys Ocean

Cited by 23 publications

References 53 publications

New Paleomagnetic and Chronological Constraints on the Late Triassic Position of the Eastern Qiangtang Terrane: Implications for the Closure of the Paleo‐Jinshajiang Ocean

New Paleomagnetic and Chronological Constraints on the Late Triassic Position of the Eastern Qiangtang Terrane: Implications for the Closure of the Paleo‐Jinshajiang Ocean

Late Triassic foreland basin and Early Palaeozoic basement in the eastern Yidun Micro‐block and its tectonic implications for the eastern Palaeo‐Tethys

Mid-cretaceous rapid denudation of Eastern Tibetan plateau: Insights from detrital records at the Southwestern corner of Sichuan basin

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