Potassic magma genesis and the Ailao Shan-Red River fault

Flower, Martin F. J.; Hoàng, Nguyễn; Lo, Ching‐Hua; Chí, Cung Thượng; Cường, Nguyễn Quốc; Liu, Futian; Deng, Jianghong; Mo, Xuanxue

doi:10.1016/j.jog.2012.06.008

Cited by 31 publications

(20 citation statements)

References 106 publications

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“…Therefore, we interpret the oldest metamorphic age (~49.6 Ma) in 15G44‐3 as recording the initial exhumation of HP metapelitic granulites in the ALS metamorphic complex. This date coincides with the timing of emplacement of alkali granitic intrusions in an extensional setting (B. Chen et al, ; Flower et al, ; Lu et al, ).…”

Section: Discussionsupporting

confidence: 74%

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Mineral phase equilibria and zircon geochronology constrain multiple metamorphic events of high‐pressure pelitic granulites in south‐easternTibetan Plateau

et al. 2019

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The Ailao Shan (ALS) metamorphic belt separates the Indochina Block to the west from the South China Block and is an important region for understanding the history of evolution of the Palaeo‐Tethys in relation to the collision of the Indian and Eurasian plates and the formation of the Tibetan Plateau. The multiple metamorphic events and P–T–t paths of the ALS belt remain debated. Here, we present the results of an integrated study of the petrography, mineral chemistry, phase equilibria modelling, and zircon U–Pb geochronology of high‐grade metasedimentary rocks from this belt. Abundant metamorphic zircon grains with mineral inclusions of Sil/Ky + Bt + Pl + Qz ± Mnz record two metamorphic events, the first one during the Triassic (227–220 Ma), although intense shearing overlapped during the Cenozoic and mineral assemblages of this thermal event were not preserved. The second metamorphic event occurred during the Palaeogene (49 –23 Ma) and involved three stages: (a) a peak high‐pressure (HP) granulite‐facies metamorphism (M1) with a mineral assemblage of Ky + Grt1 + Bt1 + Pl + Qz ± Kfs; (b) a postpeak near‐isothermal decompression (M2) characterized by Sil1–2 + Grt2 + Bt1 + Pl + Qz + Kfs + Ilm and the decompression reactions of Grt + Ky + Qz = 3An and Ky = Sil; and (c) a late decompressional cooling (M3) with a mineral assemblage of Sil3 + Grt3 + Bt2 + Pl + Qz + Mnz ± Kfs, followed by a series of hydration reactions. The metamorphic evolution occurred along a clockwise P–T–t path with peak P–T conditions of 13.5–14.0 kbar and 810–820°C. Our new data, combined with those from previous studies, reveal that the Diancang Shan–Ailao Shan Complex Belt is not a single suture that represents the closure of the Palaeo‐Tethyan Ocean during the Triassic, but that it also represents a typical continent–continent collisional orogenic belt that formed during the Eocene–Oligocene prior to the strong left‐lateral, ductile deformation along the Ailao Shan–Red River shear zone.

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Section: Discussionsupporting

confidence: 74%

“…Zircon U-Pb Concordia diagram and corresponding age spectra of garnet-bearing two-mica schist (15G36-1) and granitic leucosome (15G36-2) showing two discrete metamorphic ages [Colour figure can be viewed at wileyonlinelibrary.com] in an extensional setting(B. Chen et al, 2017;Flower et al, 2013;Lu et al, 2012).…”

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confidence: 99%

Mineral phase equilibria and zircon geochronology constrain multiple metamorphic events of high‐pressure pelitic granulites in south‐easternTibetan Plateau

et al. 2019

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“…The ASRRB was also affected by an Eocene to early Oligocene (~43 to 30 Ma) high‐potassium alkaline magmatic activity, revealed from previous studies (Chung et al, ; Liang et al, ). Occurrence of syenitic, lamprophyre, trachytic rocks, and granitic rocks in the Ailao Shan massif and contiguous areas provides arguments for intensive crust/mantle interaction (Flower et al, ; J. H. Wang et al, ) at a postcollision extensional setting (Chung et al, ). Although such rocks have not been reported in the Yao Shan complex, our results show that early granitic rocks experienced a late metamorphic event that gives an age of 37.65 ± 0.65 Ma.…”

Section: Discussionmentioning

confidence: 55%

Multistage Remobilization of the Southwestern Margin of the South China Plate: Insights From Zircon U‐Pb Geochronology and Hf Isotope of Granitic Rocks From the Yao Shan Complex, Southeastern Tibet Plateau

et al. 2019

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The Yao Shan complex, located at the southwestern margin of the South China plate, to the east of the Sanjiang-Southeast Asia Tethyan domain, and at the northern extension of the Day Nui Con Voi massif of the Ailao Shan-Red River shear zone, provides a reasonable example to study the multistage tectonic remobilization of continental plates. In this paper, we present new zircon LA-ICP-MS (Laser Ablation Inductively Coupled Plasma Mass Spectrometry) U-Pb dating results and Hf isotopic data of the granitic plutons and dikes from the Yao Shan complex. Zircon U-Pb ages of the granitic intrusions mainly concentrate on three periods: 825-780, 82-69, and 31-29 Ma. The zircons are characterized by mainly negative εHf(t) values with T DMC ages of 2637-1645, 1964-1610, and 2077-1400 Ma, respectively. The results show that the Yao Shan complex record evidences for three episodes of extensive partial melting of middle and lower crustal Precambrian crystalline basement rocks. They contributed to the granitic magmatism in relation to tectonic processes and structural deformation from Neoproterozoic, Late Cretaceous to Oligo-Miocene. Therefore, we argue that the southwestern margin of the South China plate is the weakness for multistage remobilization throughout the tectonic evolution of the plate after its primary cratonization. Remobilization of the plate margin is related to oceanic plate subduction, triggered by rifting in a passive continental margin setting, induced by extension at back-arc setting, or resulted from continental extrusion.

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“…They are mostly strike-slip faults (Flower et al, 2013;Chen et al, 2014), occurring on the basement of the Indochina and South China blocks, and the Ailaoshan Suture lies between the two blocks. They are mostly strike-slip faults (Flower et al, 2013;Chen et al, 2014), occurring on the basement of the Indochina and South China blocks, and the Ailaoshan Suture lies between the two blocks.…”

Section: Regional Geological Settingmentioning

confidence: 99%

“…In the western SCS, the NW-trending Red River Fault occurs in the northwest, the S-N-trending Eastern Vietnam Fault in the middle, and the Lupar and Tinjar faults in the southeast of the region. They are mostly strike-slip faults (Flower et al, 2013;Chen et al, 2014), occurring on the basement of the Indochina and South China blocks, and the Ailaoshan Suture lies between the two blocks. The latter extends to the north as a western marginal fault zone.…”

Section: Regional Geological Settingmentioning

confidence: 99%

Temporal and spatial distribution of Cenozoic igneous rocks in the South China Sea and its adjacent regions: implications for tectono‐magmatic evolution

Hui

et al. 2016

Geological Journal

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The ocean–continent transition/conjunction zone is a mysterious and significant region in global tectonics and geodynamic evolution. The South China Sea (SCS) is one of the largest marginal basins in the Western Pacific with significant Cenozoic magmatic activities. The relationship between the tectono‐magmatic evolution and the tectonic setting of these Cenozoic igneous rocks is still controversial. In this study, the interpretation of gravity data, magnetic observation and seismic profiles is combined to identify the Cenozoic igneous rocks in the SCS and adjacent regions, and more than 70 magmatic activities have been discerned. We also show how the tectonic movements control the lithology and distribution of these magmatic activities. These Cenozoic magmatic rocks are related to the pre‐spreading, syn‐spreading and post‐spreading of the SCS. We suggest a geodynamic evolution of the SCS according to the temporal and spatial distribution of the igneous rocks. (1) An early period of bimodal volcanism (>32 Ma ago) mainly happened in the Paleogene basins at the northern margin of the SCS. This earlier volcanism happened under a trans‐extensional regime, which resulted from the collision between the Indian and the Eurasian plates since the early Cenozoic. The magmatic rocks may be related to the NNE‐trending right‐stepping dextral strike‐slip faults and the syn‐kinematic pull‐apart basins. These igneous rocks are mostly NNE trending. It is consistent with the Cenozoic dextral trans‐extensional tectonic setting in the East Asian Continental Margin. (2) Syn‐spreading igneous rocks first formed in the Northwest Sub‐basin of the SCS, and then later in the Central and Southwest sub‐basins. The mechanism of the magmatic emplacement results from the NNE‐trending right‐stepping dextral strike‐slip pull‐apart tectonic activity. (3) The spatial alignment of the Quaternary post‐spreading basalts is nearly E–W‐trending, and the different magmatic zones are segmented by NNE‐trending strike‐slip faulting. These volcanics are under an extrusion regime, which resulted from the arc–continent collision between the Luzon–Taiwan Arc and the Eurasian Plate due to the continuously WNW‐directed indentation of the Philippine Sea Plate during the period 9–6 Ma ago. In addition, the nascent NNE trending and dextral Changle–Nanao Fault may have played a significant role in the southward extrusion of the Taiwan Island Arc and the southeast SCS, resulting in an E–W‐trending distribution or strike of the volcanics and normal faults. In Indochina and the Malay Peninsula, widespread Cenozoic extensional post‐spreading granitic plutons are possibly derived from the mantle plume. Magnetic anomaly interpretation and tectonic analysis on these mafic rocks suggest that they were controlled by the Ailaoshan Red River left‐lateral ductile strike‐slip fault zone. Copyright © 2016 John Wiley & Sons, Ltd.

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Potassic magma genesis and the Ailao Shan-Red River fault

Cited by 31 publications

References 106 publications

Mineral phase equilibria and zircon geochronology constrain multiple metamorphic events of high‐pressure pelitic granulites in south‐easternTibetan Plateau

Mineral phase equilibria and zircon geochronology constrain multiple metamorphic events of high‐pressure pelitic granulites in south‐easternTibetan Plateau

Multistage Remobilization of the Southwestern Margin of the South China Plate: Insights From Zircon U‐Pb Geochronology and Hf Isotope of Granitic Rocks From the Yao Shan Complex, Southeastern Tibet Plateau

Temporal and spatial distribution of Cenozoic igneous rocks in the South China Sea and its adjacent regions: implications for tectono‐magmatic evolution

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