Petrology and geochemistry of postcollisional volcanic rocks from the Tibetan plateau: Implications for lithosphere heterogeneity and collision-induced asthenospheric mantle flow

Mo, Xuanxue; Zhao, Zhidan; Deng, Jianghong; Flower, Martin F. J.; Yu, Xuehui; Luo, Zhaohua; Li, Youguo; Zhou, S.; Dong, Guochen; Zhu, Di‐Cheng; Wang, Liangliang

doi:10.1130/2006.2409(24)

Cited by 51 publications

(50 citation statements)

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“…Post-collisional volcanism began immediately after the collision and has continued to the present (Turner et al 1996;Ding et al 2003;Nomade et al 2004;Williams et al 2004;Chung et al 2005;Guo et al 2006;Mo et al 2006;Zhao et al 2009). This magmatism generated potassic to ultrapotassic volcanic rocks in the Lhasa and Qingtang terranes.…”

Section: Geological Backgroundmentioning

confidence: 95%

“…Post-collisional magmatism associated with this subduction generated the potassic and ultrapotassic volcanic rocks of the Tibetan Plateau (Mo et al 2006;Zhao et al 2009). Potassic and ultrapotassic rocks along the Red River Fault show Sr-Nd isotopic compositions similar to those of the Indian continental basement, providing evidence for subduction of the Indian continental crust underneath Tibet and SW China (Wang et al 2001;Zhao et al 2003;Guo et al 2006).…”

Section: An Integrated Model For the Tengchong Volcanoesmentioning

confidence: 97%

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Heterogeneous mantle source and magma differentiation of quaternary arc-like volcanic rocks from Tengchong, SE margin of the Tibetan Plateau

Zhou

Robinson

Wang

et al. 2011

Contrib Mineral Petrol

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The Tengchong volcanic field north of the Burma arc comprises numerous Quaternary volcanoes in the southeastern margin of the Tibetan Plateau. The volcanic rocks are grouped into four units (1-4) from the oldest to youngest. Units 1, 3 and 4 are composed of olivine trachybasalt, basaltic trachyandesite and trachyandesite, and Unit 2 consists of hornblende dacite. The rocks of Units 1, 3, and 4 form a generally alkaline suite in which the rocks plot along generally linear trends on Harker diagrams with only slight offset from unit to unit. They contain olivine phenocrysts with Fo values ranging from 65 to 85 mol% and have Cr-spinel with Cr# ranging from 23 to 35. All the rocks have chondrite-normalized REE patterns enriched in LREE and primitive mantlenormalized trace element patterns depleted in Ti, Nb and Ta, but they are rich in Th, Ti and P relative to typical arc volcanics. Despite minor crustal contamination, 87 Sr/ 86 Sr ratios (0.706-0.709), eNd values (-3.2 to -8.7), and eHf values (?4.8 to -6.4) indicate a highly heterogeneous mantle source. The Pb isotopic ratios of the lavas ( 206 Pb/ 204 Pb = 18.02-18.30) clearly show an EMI-type mantle source. The underlying mantle source was previously modified by subduction of the Neo-Tethyan oceanic and Indian continental lithosphere. The present heterogeneous mantle source is interpreted to have formed by variable additions of fluids and sediments derived from the subducted Indian Oceanic lithosphere, probably the Ninety East Ridge. Magma generation and emplacement was facilitated by transtensional NS-trending strike-slip faulting.

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Section: Geological Backgroundmentioning

confidence: 95%

Section: An Integrated Model For the Tengchong Volcanoesmentioning

confidence: 97%

Heterogeneous mantle source and magma differentiation of quaternary arc-like volcanic rocks from Tengchong, SE margin of the Tibetan Plateau

Zhou

Robinson

Wang

et al. 2011

Contrib Mineral Petrol

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“…Because of its unique geographic and geological setting, the Qiangtang block has attracted geologists from around the world. Recent studies have included studies of the crystalline basement Tan et al 2009;Wang et al 2009;Guynn et al 2012) and crust structure (Rodgers and Schwartz 1998;Unsworth et al 2004;Li et al 2006;, the metamorphic rocks of the central Qiangtang block (Kapp et al 2003;Zhang et al 2006;Zhai et al 2007Zhai et al , 2011, Mesozoic volcanic rocks Fu et al 2010;Zhai et al 2010;, Cenozoic volcanic rocks (Mo et al 2006;Ding et al 2007), oil shale (Fu et al 2011a, b) and petroleum exploration in the Mesozoic basin Wang et al 2004;Guo et al 2008;Wang et al 2009). Sedimentary studies show that the formation and closure of the Mesozoic Qiangtang basin were closely connected with the tectonic evolutionary processes in the Bangong-Nujiang Ocean (Wang et al 2004Zhang et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Mesozoic and Cenozoic Cooling History of the Qiangtang Block, Northern Tibet, China: New Constraints from Apatite and Zircon Fission Track Data

Song¹,

Wang²,

Fu³

et al. 2013

Terr. Atmos. Ocean. Sci.

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This study used a new set of zircon and apatite fission track ages to quantitatively document the tectonic evolution and cooling histories of the Qiangtang block of the central Tibetan Plateau. The results indicate that the Qiangtang block underwent three cooling stages at ~148 -73, ~50 -20, and ~20 -0 Ma. The three-stage cooling history and tectonic exhumation were controlled by the closure of the Bangong-Nujiang Suture during the Late Jurassic-Late Cretaceous, the India-Asia collision in the Paleogene, and the underthrusting of the India Plate during the Late Cenozoic. In addition to revealing the Late JurassicLate Cretaceous cooling events, the annealing patterns of the zircon fission track samples indicate different burial depths, which may help identify the Jurassic basin characteristics of the Qiangtang block. The apatite fission track (AFT) ages range from 60 ± 5 Ma to 26 ± 3 Ma, with a mean age of 44 Ma. These ages indicate that the Cenozoic exhumation of the Qiangtang block may have started in the Eocene. Inverse modeling of the AFT data shows that the Qiangtang block had a relatively slow cooling rate of approximately 0.5 -1°C Myr -1 from 50 to 20 Ma. After ~20 Ma, most of the samples show evidence for a rapid cooling stage with a cooling rate of 4 -6°C Myr -1 .

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“…in the Mediterranean (Duggen et al, 2005), Tibet (Turner et al, 1996;Mo et al, 2006) and Baja California (Negrete-Aranda and Cañon-Tapia, 2008). The existence of such magmas may be associated with the post-collisional evolution of inherited slabs.…”

Section: Introductionmentioning

confidence: 99%

Tectonic significance of changes in post-subduction Pliocene–Quaternary magmatism in the south east part of the Carpathian–Pannonian Region

et al. 2011

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The south-eastern part of the Carpathian-Pannonian region records the cessation of convergence between the European platform/ Moesia and the Tisza-Dacia microplate. Magmatic activity in this area, in close proximity to the 'Vrancea zone', shows a shift from normal calc-alkaline to much more diverse compositions (adakite-like calc-alkaline, K24 alkalic, mafic Na-alkaline and ultrapotassic) in the Pliocene-Quaternary, suggesting a significant change in geodynamic processes at approximately 3 Ma. We review the tectonic setting, timing, petrology and geochemistry of the post-collisional volcanism to constrain the role of geodynamics on melt production and migration. The calc-alkaline volcanism (5.3-3.9 Ma) marks the end of normal subduction-related magmatism along the post-collision Călimani-Gurghiu-Harghita volcanic chain in front of the European convergent plate margin. At ca. 3 Ma magma compositions changed in South Harghita to adakite-like calc-alkaline and continued until recent times (< 0.03 Ma) interrupted at 1.6-1.2 Ma by generation of Na and K alkalic varieties, signifying changes in the source and melting mechanism. We attribute the progressive change in magma composition in front of the Moesian platform to two main geodynamic events: (1) slab-pull and steepening with opening of a tear window (adakite-like calc-alkaline magmas) and (2) inversion tectonics (Na and K alkalic magmas). Contemporaneous post-collision volcanism at the eastern edge of the Pannonian Basin at 2.6-1.3 Ma was dominated by Na alkalic and ultrapotassic magmas, suggesting a close relationship with thermal rifting and inversion tectonics. Similar timing, magma chamber processes and volume for K-alkalic (shoshonitic) magmas in the South Apuseni Mountains (1.6 Ma) and South Harghita area at a distance of ca. 200 km imply a regional connection with the inversion tectonics. Key words: Post-collisional slab mechanics, calc-alkaline, adakite-like, Na-alkalic, K-alkalic and ultrapotassic magmas. IntroductionPost-collision magmatism at convergent plate boundaries is very complex and is usually characterized by the presence of adakite-like and/or alkaline magmas, e.g. in the Mediterranean (Duggen et al., 2005), Tibet (Turner et al., 1996;Mo et al., 2006) and Baja California (Negrete-Aranda and Cañon-Tapia, 2008). The existence of such magmas may be associated with the post-collisional evolution of inherited slabs. A typical Africa-European collision zone includes a subduction stage characterized by roll-back associated with extensional back-arc volcanism in highly arcuate orogenic settings (Faccenna et al., 2004;Harangi et al., 2006). The SE Carpathians is a region where the post-collisional stage of a highly arcuate orogen is associated with unusual volcanism, where the final stage of roll-back of the slab can be seen in the high-velocity intermediate-depth mantle anomaly detected by seismic tomography studies (e.g., Martin et al., 2006), associated with the Vrancea seismic zone (e.g., Oncescu and Bonjer, 1997). After the collision at 11...

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Petrology and geochemistry of postcollisional volcanic rocks from the Tibetan plateau: Implications for lithosphere heterogeneity and collision-induced asthenospheric mantle flow

Cited by 51 publications

References 48 publications

Heterogeneous mantle source and magma differentiation of quaternary arc-like volcanic rocks from Tengchong, SE margin of the Tibetan Plateau

Heterogeneous mantle source and magma differentiation of quaternary arc-like volcanic rocks from Tengchong, SE margin of the Tibetan Plateau

Mesozoic and Cenozoic Cooling History of the Qiangtang Block, Northern Tibet, China: New Constraints from Apatite and Zircon Fission Track Data

Tectonic significance of changes in post-subduction Pliocene–Quaternary magmatism in the south east part of the Carpathian–Pannonian Region

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