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Gondwana Research
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#2Michael D. Brown (UMD: University of Maryland, College Park)H-Index: 46
Last.X. Dong
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ABSTRACT In the eastern Himalayan syntaxis, the Indus–Tsangpo Suture Zone separates the Himalaya to the south from the southern Lhasa terrane to the north. In this study, we combine petrology, zircon U–Pb geochronology and phase equilibrium modeling to quantify the P–T–t paths of metapelites from the Namche Barwa complex, part of the Himalaya, and the Nyingchi complex, part of the southern Lhasa terrane. The Namche Barwa complex is interpreted to record slow cooling across a HP granulite facies ...
#1Stephen CollettH-Index: 5
#2Karel Schulmann (UDS: University of Strasbourg)H-Index: 41
Last.Jitka MikovaH-Index: 7
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Abstract A combined U-Pb zircon geochronological and whole-rock isotopic and geochemical study has been carried out on high-grade orthogneiss, meta-basite, and meta-sediments from the Erzgebirge. The results indicate multiple pulses of Ediacaran–Ordovician magmatism in a transitional volcanic-arc to rift-basin setting. Orthogneiss from high-pressure nappes exhibit a step-like pattern of inherited zircon ages and emplacement ages of 500–475 Ma. In contrast, granite gneiss from the medium-pressure...
#1Matthew CampbellH-Index: 8
#2Gideon RosenbaumH-Index: 28
Last.Nick MortimerH-Index: 31
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Abstract Permian–Triassic fore-arc basin terranes are exposed in New Zealand, but their original positions and tectonic configurations along the eastern Gondwanan margin are not fully understood. To better constrain late Paleozoic and Mesozoic reconstructions, we investigated the provenance of Permian–Triassic marine sandstone units from the Dun Mountain-Maitai Terrane (Maitai Group) and the Kaka Point Structural Belt (Willsher Group). The recognition of abundant volcanic lithic fragments in the...
#1Zhao Liu (CAS: Chinese Academy of Sciences)
#2Omar Bartoli (UNIPD: University of Padua)H-Index: 12
Last.Xiao-Long HuangYaoling (CAS: Chinese Academy of Sciences)H-Index: 28
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Abstract The Chinese Altai orogen formed in the Paleozoic is an important part of the Central Asian Orogenic Belt (CAOB), and the study on the metamorphism will provide novel and robust constraints on its tectonic evolution. In this study, we investigate our newly recognized garnet–orthopyroxene–cordierite granulites at Wuqiagou area in the southern Chinese Altai. Detailed petrographic study and P–T estimates suggest four distinct metamorphic stages of mineral assemblages: (1) pre–peak (M1) stag...
#1Duo Zhang (JLU: Jilin University)H-Index: 1
#2Yongjiang Liu (Ocean University of China)H-Index: 18
Last.Zhao-xu Chen (JLU: Jilin University)
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Abstract The eastern segment of Central Asian Orogenic Belt underwent not only a long evolution history related to the Paleo-Asian Ocean during Paleozoic but also the tectonic overprinting by the westward subduction of Paleo-Pacific Ocean crust during Mesozoic. When the subduction of Paleo-Pacific Ocean crust started has been long debated issue for understanding the tectonic evolution of the eastern Asian continental margin. The eastern margin of the Jimusi Block (Wandashan Terrane) preserved co...
#1Yuan Li (USTC: University of Science and Technology of China)H-Index: 2
#2Yican Liu (USTC: University of Science and Technology of China)H-Index: 17
Last.Chiara Groppo (UNITO: University of Turin)H-Index: 20
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Abstract A combined geochemical (whole-rock elements and Sr-Nd-Pb isotopes, zircon trace elements and Hf isotopes) and geochronological (zircon U–Pb ages) study was carried out on the relatively low-grade meta-basites and meta-granitoids from Longjingguan within the central Dabie ultrahigh-pressure (UHP) metamorphic zone, east-central China. Zircon investigations indicate that the meta-basites were formed at ∼772 Ma and subsequently experienced granulite-facies metamorphism at ∼768 Ma and a late...
#1E. FiciniH-Index: 1
#2Marco CuffaroH-Index: 14
Last.Carlo DoglioniH-Index: 47
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Abstract The lithospheric sinking along subduction zones is part of the mantle convection. Therefore, computing the volume of lithosphere recycled within the mantle by subducting slabs quantifies the equivalent amount of mantle that should be displaced, for the mass conservation criterion. The rate of subduction is constrained by the convergence rate between upper and lower plates and the motion of the subduction hinge H that may either converge or diverge relative to the upper plate. Here, star...
#1Youqing Wei (CAS: Chinese Academy of Sciences)
#2Zhidan Zhao (China University of Geosciences)H-Index: 41
Last.Lawangin Sheikh (China University of Geosciences)
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Abstract In order to reconstruct tectonic evolution history of the southern margin of Asia (i.e., Lhasa terrane) before the India-Asia collision, here we present a comprehensive study on the clastic rocks in the southern Lhasa terrane with new perspectives from sedimentary geochemistry, detrital zircon geochronology and Hf isotope. Clasts from the Jurassic-Early Cretaceous sedimentary sequences (i.e., Yeba and Chumulong Formations) display high compositional maturity and experienced moderate to ...
#1Weiliang LiuH-Index: 6
#2Yun ZhongH-Index: 4
Last.Bin XiaH-Index: 7
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Abstract The Zedong ophiolite is the largest ophiolite massif east of Dazhuqu in the Yarlung Zangbo Suture Zone in the southern Tibetan Plateau. However, its age, geodynamic setting and relationship to the Xigaze ophiolite remain controversial. New zircon U–Pb ages, whole-rock geochemical and Nd-Pb isotopic data from ophiolitic units provide constraints on the geodynamic and tectonic evolution of the Zedong ophiolite. U–Pb zircon geochronology of dolerite lavas and late gabbro–diabase dikes yiel...
#1Wei WangH-Index: 10
#2Ming WangH-Index: 13
Last.An-Bo LuoH-Index: 1
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Abstract The transition from oceanic subduction to continental collision is a key stage in the evolution of ancient orogens. We present new data for Early Cretaceous diorite and granite porphyry from north–central Tibet to constrain the evolution of the Bangong–Nujiang Tethyan Ocean (BNTO). The diorites have moderate SiO2 and high MgO contents, similar to high-Mg andesites. Zircon grains yield U–Pb ages of 128–124 Ma and positive eHf(t) values between +13.2 and + 16.3, corresponding to Hf deplet...
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