Permian radiolarians, chert and basalt from the Daxinshan Formation in Lancangjiang belt of southwestern Yunnan, China

Feng, Qinglai; Shen, Shangyue; Liu, Benpei; Helmcke, Dietrich; Qian, Xianggui; Zhang, Weimin

doi:10.1007/bf02879697

Cited by 13 publications

(16 citation statements)

References 11 publications

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“…Fine-grained gabbro with a U-Pb zircon age of 292±1 Ma and εNd(t) of 5.3 is indicative of early Permian sea-floor spreading and a short-lived Permian ocean basin is indicated (Hennig et al, 2009). Deep-marine radiolarian cherts are of late Early, Middle and Late Permian age (Feng & Liu, 1993;Feng & Ye, 1996). The suture is equivalent to what has been previously referred to as the Lancangjiang Belt or the southern Lancangjiang Suture by some authors (Liu et al, 1991Fang et al, 1994Fang et al, , 1996 and is here regarded as a segment of the Sukhothai back arc basin.…”

Section: Bulletin Of the Geological Society Of Malaysia Volume 63 Jmentioning

confidence: 99%

Tectonic evolution of Sundaland

Metcalfe¹

2017

BGSM

201

139

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Section: Bulletin Of the Geological Society Of Malaysia Volume 63 Jmentioning

confidence: 99%

Tectonic evolution of Sundaland

Metcalfe¹

2017

BGSM

201

139

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“…Radiolarian ages in the Jinghong back-arc suture range from early Permian to Middle Triassic (e.g. Li 1999;Feng et al 2002;Saesaengseerung et al 2008), a much narrower range than that reported from the Changning-Menglian suture (Devonian to Middle Triassic) (e.g. Liu et al 1993;Fang et al 1994;Li 1999;Feng et al 2001), suggesting a short-lived oceanic basin of possible back-arc origin (Sone and Metcalfe 2008).…”

Section: Geological Settingmentioning

confidence: 92%

Early Middle Triassic mafic dikes from the Baoshan subterrane, western Yunnan: implications for the tectonic evolution of the Palaeo-Tethys in Southeast Asia

Liao¹,

Yin²,

Sun³

et al. 2013

International Geology Review

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The time of final closure of the Palaeo-Tethys and the Sibumasu-Indochina collision in Southeast Asia represents a major unresolved geologic problem. Here, we present zircon chronology, whole-rock elemental, Sr-Nd, and zircon Hf isotopic geochemistry for newly discovered mafic dikes from the northern segment of the Sibumasu terrane, to provide constraints on this issue. Zircon U-Pb data indicate that the dikes were emplaced at 240 ± 3 Ma. These are the earliest Mesozoic magmatic rocks reported so far in the Sibumasu terrane, the late Palaeozoic passive margin of the Palaeo-Tethys. They are subalkaline tholeiites, showing geochemical characteristics similar to those of enriched mid-ocean ridge basalts (E-MORBs). They have 87 Sr/ 86 Sr(t) ratios of 0.703161-0.703826, εNd(t) of +4.8 to +7.5, and zircon εHf(t) of +9.2 to +13.3, implying strong mantle depletion. They were derived by partial melting of asthenospheric mantle and underwent subsequent fractional crystallization and lithospheric assimilation. The geologic-petrologic evidence suggests that the mafic dikes were generated in a collisional setting, when suturing of the Baoshan and Simao subterranes (the two subterranes are part of the Sibumasu and Indochina terranes, respectively) occurred. These early Middle Triassic mafic dikes provide an upper limit for Sibumasu-Indochina collision. In conjunction with previous work, we conclude that the final closure of the Palaeo-Tethys and collision of the Sibumasu and Indochina terranes took place during the late Permian to Early Triassic.

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“…A well‐defined succession of oceanic series, composed of mid‐ocean ridge basalts, radiolarian chert, pelagic limestone and mudstone, turbidites, and carbonate capped seamounts, can also be found inside the suture in Thailand (Metcalfe et al, 2017) (Figure 6). Radiolarians found in the pelagic cherts were dated as Middle Devonian to Middle Triassic (Caridroit, Bohlke, Lumjuan, Helmcke, & DeWever, 1993; Caridroit, Vachard, & Fontaine, 1992; Feng et al, 2002; Hara et al, 2010; Randon, Wonganan, Caridroit, Perret, & Degardin, 2006; Sashida et al, 2000; Sashida & Salyapongse, 2002; Ueno & Charoentitirat, 2011; Wonganan et al, 2007; Wonganan & Caridroit, 2005, 2007), while the pelagic limestone has been dated as Upper Devonian and Lower Permian based on conodont faunas (Königshof et al, 2012; Metcalfe et al, 2017), constraining the life span of this part of the palaeo‐oceanic basin. In the Chiang Mai area, the basaltic rocks formed in the intra‐oceanic seamount setting within the Palaeo‐Tethys, present an argon plateau age of 282.3 ± 1.4 Ma (Wang et al, 2017).…”

Section: Palaeo‐tethys: a Complex Splay Systemmentioning

confidence: 99%

“…These ages suggest a Carboniferous to Permian oceanic spreading in the Nan Basin. Moreover, the chert from the Jinghong Suture is limited to the late Early Permian to Late Permian (Feng et al, 2000; Feng et al, 2002; Feng & Liu, 1993). The Nan Suture, which also contains radiolarian chert from the late Middle Permian (Hada, Bunopas, Ishii, & Yoshikura, 1999), extends southwards towards Sa Kaeo Suture (Bunopas, 1981).…”

Section: Palaeo‐tethys: a Complex Splay Systemmentioning

confidence: 99%

Records of the oceanic propagator closure at the southern splay of the Palaeo‐Tethys

Choong

Pubellier

Sautter³

et al. 2022

Geological Journal

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The Palaeo‐Tethys is known to have diverged into several splays throughout East and South‐east Asia. Several researchers have widely studied the importance and geometries of the Palaeo‐Tethys' branches. Plate reconstruction geometries for the southern Palaeo‐Tethys splay suggest that the ocean either connects to the proto‐Pacific or dies out. We review and discuss the Late Palaeozoic to the Early Mesozoic lithologies attributed to the Palaeo‐Tethys, from the Himalayan Syntaxis in the north to the Bangka and Belitung islands in western Indonesia to the south. Relics of oceanic crust and deep‐sea sediments related to the main Palaeo‐Tethys Basin can be traced from the South China (Yunnan)‐Thailand border to Peninsular Malaysia. A sub‐parallel back‐arc suture exists in eastern Thailand in the north and vanishes towards the south at the latitude of the Gulf of Thailand. Towards the south of Peninsular Malaysia, the material that constitutes the suture zone of main Palaeo‐Tethys is found offshore in the Riau Archipelago, Indonesia, and has been extensively eroded. Thus, we rely on gravity signatures to extrapolate the extension of the structures to the Bangka and Belitung islands, which show only minor serpentine and pillow basalts occurrences along a line that curves towards Borneo. The metamorphic rocks associated with the suture zones range from high grade (gneiss) in Thailand to low grade (mica schist and minor amphibolite) in Peninsular Malaysia. The syn‐ and post‐collisional granitic bodies that form large batholiths in Thailand and Malaysia are comparatively smaller in Indonesia, particularly on Belitung Island, suggesting the lack of large underplating of the Sibumasu crust within the region. We interpret the stratigraphic and tectonic observations of the southern Palaeo‐Tethys to support the theory of the southward (present orientation) opening of a propagating oceanic basin from Devonian to Carboniferous, which began to close from the Permian to Triassic period.

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Permian radiolarians, chert and basalt from the Daxinshan Formation in Lancangjiang belt of southwestern Yunnan, China

Cited by 13 publications

References 11 publications

Tectonic evolution of Sundaland

Tectonic evolution of Sundaland

Early Middle Triassic mafic dikes from the Baoshan subterrane, western Yunnan: implications for the tectonic evolution of the Palaeo-Tethys in Southeast Asia

Records of the oceanic propagator closure at the southern splay of the Palaeo‐Tethys

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