Zircon U–Pb ages of Permian–Triassic igneous rocks in the Song Hien structure, NE Vietnam: The Emeishan mantle plume or the Indosinian orogeny?

Svetlitskaya, Tatyana V.; Ngo, Thi Huong; Nevolko, Peter A.; Изох, А. Э.; Shelepaev, R.A.; Tran, Tri; Fominykh, Pavel A.; Pham, Ngoc Can

doi:10.1016/j.jseaes.2021.105033

Cited by 5 publications

(2 citation statements)

References 80 publications

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“…To the south, it is bounded by a storm‐ and wave‐dominated shelf developed in the Song Hien rift (Komatsu et al, 2010), and separated from the Permian to Triassic magmatic belt of northeast Vietnam by the Babu and Wenshan‐Malipo fault zones (Figure 2). The development of the Song Hien rift in the southernmost part of the basin is expressed by felsic volcano‐sedimentary strata intruded by alkaline mafic to ultramafic sills (Lepvrier et al, 2011; Svetlitskaya et al, 2022; Figure 2), and has been mostly ignored in earlier interpretations of the basin.…”

Section: Geological Settingmentioning

confidence: 99%

A back‐arc transtensional origin for the Nanpanjiang basin in the pre‐Norian Triassic, with implications for the broader intracontinental development of South China

et al. 2022

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The generally accepted foreland interpretation of the Nanpanjiang basin has been regarded as providing support for the hypothesized Indosinian collision between the South China and Indochina blocks, and it has led to the long‐standing view that crustal shortening dominated the Triassic intracontinental development of South China. Here, we examine the stratigraphic architecture, magmatism and gross structural features of the Nanpanjiang basin. Outcrop studies indicate that a north‐stepping axial turbidite system was confined by intrabasinal faults, the active development of which is indicated by mass‐transport complexes. Field mapping combined with U–Pb dating of baddeleyite and zircon reveals that magmatism in the southern part of the basin coincides with a distinct episode of bimodal volcanism from ca. 244 to 242 Ma, and is unrelated to the middle Permian Emeishan plume. Differences in tectonic subsidence between hanging‐wall and footwall blocks, as that has been quantified by the backstripping of composite sections, show that synsedimentary dip slip along intrabasinal faults was of normal sense. Meanwhile, a role for strike‐slip deformation is registered by the left‐lateral offset of middle Permian and Middle Triassic piercing points and the exceptional preservation in outcrop of syndepositional negative flower structures. For these reasons, therefore, the pre‐Norian Triassic Nanpanjiang basin is thought to represent a transtensional back‐arc setting, a result that leads to an unresolved paradox: in adjacent parts of South China to the east, coeval development involves crustal thickening, nonmarine sedimentation and granitic plutonism. A new lateral decoupling model consistent with palaeomagnetic evidence for large‐scale block rotation is tentatively proposed here as a working hypothesis to explain the observed intracontinental evolution of South China during the Triassic assembly of eastern Asia. We propose that such decoupling may relate in part to the configuration of inherited crustal weaknesses.

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Section: Geological Settingmentioning

confidence: 99%

A back‐arc transtensional origin for the Nanpanjiang basin in the pre‐Norian Triassic, with implications for the broader intracontinental development of South China

et al. 2022

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“…Mafic-ultramafic rocks derived from picritic and basaltic magmas are widespread in the orogenic belts of Central and Southeast Asia and are related to large igneous provinces (LIPs) [1]. Recent study of mafic-ultramafic layered intrusions with sulphide mineralization has been undertaken in south-eastern Siberia [2][3][4][5], Vietnam [6][7][8][9], China [10][11][12][13][14] and Mongolia [15][16][17]. Such intrusions are derived from mantle magmas and their study contributes significantly to petrological models and reconstruction of the evolutionary history of geological structures.…”

Section: Introductionmentioning

confidence: 99%

Petrology and Age of the Yamaat Uul Mafic Complex, Khangai Mountains, Western Mongolia

et al. 2023

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The Yamaat Uul mafic complex with Cu-Ni mineralization is located in the Khangai Mountains of Western Mongolia. We have received new unique data for mafic rocks of the complex: U-Pb dating (SHRIMP II), mineralogy (WDS) and geochemistry (XRF, ICP-MS), Sm-Nd and Rb-Sr isotope data and sulphur isotopes. The Yamaat Uul mafic complex consists of two intrusions: Intrusion 1 is represented by rocks of plagioclase cumulates and olivine–pyroxene cumulates; Intrusion 2 consists of monzogabbro. Intrusions 1 and 2 are different in composition of minerals such as olivine, plagioclase and biotite. The monzogabbro has higher contents of incompatible elements (REE, K, Ti, P) than rocks of Intrusion 1. Zircon U-Pb dating of the anorthosite and Bt-Am-Ol gabbronorite shows a Late Permian age (255.8 ± 2.9 Ma and 262.6 ± 3.1 Ma, respectively) for the Yamaat Uul mafic complex. All of the rocks of the complex are derived from a unified parental melt due to different amounts of trapped melts in plagioclase and olivine–pyroxene cumulates and without crustal contamination. The Cu-Ni mineralization of the complex has a low degree of evolution of the sulphide melt, similar to PGE-Cu-Ni mafic–ultramafic intrusions of the Khangai Mountains (Nomgon and Oortsog Uul). The Yamaat Uul mafic complex together with other mafic–ultramafic intrusions of the Khangai Mountains is related to the Khangai LIP and can be considered as potential for the PGE-Cu-Ni. The new geological, petrological, geochemical and isotope–geochronological data can later be used to reconstruct the geotectonics of the Khangai Mountains and the Central Asian orogenic belt as a whole.

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Emerging trends in earth science for sustainable futures in the SE Asia region

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Makoundi²,

Basori³

et al. 2022

Journal of Asian Earth Sciences

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Zircon U–Pb ages of Permian–Triassic igneous rocks in the Song Hien structure, NE Vietnam: The Emeishan mantle plume or the Indosinian orogeny?

Cited by 5 publications

References 80 publications

A back‐arc transtensional origin for the Nanpanjiang basin in the pre‐Norian Triassic, with implications for the broader intracontinental development of South China

A back‐arc transtensional origin for the Nanpanjiang basin in the pre‐Norian Triassic, with implications for the broader intracontinental development of South China

Petrology and Age of the Yamaat Uul Mafic Complex, Khangai Mountains, Western Mongolia

Emerging trends in earth science for sustainable futures in the SE Asia region

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