Showing papers in "Gondwana Research in 2007"

TL;DR: In this paper, an east-west striking thousand kilometer long belt of khondalites (granulite facies metapelites) stretches along the northern margin of the North China craton, on the cratonward side of the Northern Hebei orogenic belt.

TL;DR: In this paper, the authors compared the thermal structure of the Earth's mantle with a comparison with seismic tomography under the Western Pacific Triangular Zone (WPTZ), showing the presence of two major superplumes and one downwelling.

TL;DR: In this article, the authors reported the first time the occurrence of Mg-Al granulites within the khondalite belt of the North China Craton and provided robust evidence for extreme crustal metamorphism at ultrahigh-temperature (UHT) conditions in this region.

TL;DR: In this paper, the authors used SHRIMP U-Pb zircon geochronological and geochemical data for the Taohong and Xiqiu tonalite-granodiorite stocks from northeastern Zhejiang, southeastern margin of the Yangtze Block.

TL;DR: In this paper, the SHRIMP U-Pb zircon ages presented here indicate that the original lithostratigraphy and the old “Group” and “Formation” terminology should be abandoned.

TL;DR: The Middle Jurassic Mirdita ophiolites in northern Albania constitute a critical transition between the dominantly mid-ocean ridge basalt (MORB)-related Early Jurassic Alpine-Apennine ophiliites in the west and supra-subduction zone (SSZ)-generated Cretaceous Eastern Mediterranean ophiola in the east.

TL;DR: In this paper, the authors presented new zircon U-Pb data and interpretations for the gneissic rocks in the Yunkai massif in order to constrain the timing and evolution of the Caledonian tectonothermal event in the South China Block (SCB).

TL;DR: In this paper, the authors proposed a petrologic model for arc volcanism, where they combined tomographic images and earthquake hypocenters with phase diagrams in the systems of peridotite+water.

TL;DR: The geologic framework of the Phanerozoic Qinling-Dabie orogen was built up through two major suturing events of three blocks. as mentioned in this paper showed that the blocks are surrounded by complexly deformed Devonian to Early Triassic metasandstones and metapelites, forming a regional-scale blockin-matrix melange fabric.

TL;DR: In this paper, the authors presented whole-mantle tomographic images under 60 major hotspots on Earth, showing that plume-like, continuous low-velocity (low-V) anomalies in both the upper and lower mantle are visible under both the continental and oceanic hotspots.

TL;DR: In this article, the authors used the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data of the Wadi Kid metamorphic belt in southeastern Sinai in Egypt to solve the problem of difficult access, complexity of structures and lack of resolution and integrity of lithological differentiation using conventional mapping techniques.

TL;DR: In this article, the 1.78 Ga mafic dyke swarms and some coeval volcanic associations constitute a Large Igneous Province in the central North China craton and are chemically delineated into three groups: the LT Group is gabbroic and has low-Fe-Ti contents, acting as parental magma; the NW Group is high in Fe-Ti-contents and doleritic with an iron-enriched trend; whereas the EW Group is dolerite to andesitic and crystallized from relict siliceous liquids with

TL;DR: In this paper, it is shown that trace element-enriched felsic volcanic horizons show geochemical evidence for the interaction between mafic magmas and crust, but this evidence, on its own, can equally well be interpreted in terms of either a subductionenriched mantle source or local and limited assimilation into the voluminous tholeiitic magmas that dominate the Pilbara supergroup.

TL;DR: In this paper, the authors proposed a new model for the transportation of water from the subducting slab into the mantle transition zone using a recently developed petrogenetic grid for MORB+H2O.

TL;DR: In this article, the authors reported the first occurrence of bimodal dyke in the Shuigongtuan area of Bachu County, Tarim Basin, NW China.

TL;DR: A 1600 km long Archean foreland basin and thrust belt fringes the eastern side of the Central Orogenic belt of the North China craton is described in this article.

TL;DR: In this paper, the authors performed geochronologic, geochemical, and Nd isotopic analyses for an early Paleoproterozoic high-K intrusive complex exposed in southwestern Tarim, NW China.

TL;DR: In this paper, geochemical and isotopic data were reported for mid-Neoproterozoic volcanic rocks and mafic intrusions in northern Guangxi (Guibei) and western Hunan (Xiangxi) Provinces along the southern margin of the Yangtze Block.

TL;DR: In this article, the authors propose a crustal-detachment and thrust model and suggest that the collision belt between the Yangtze Block and NCB (Sino-Korea Craton) is preserved along the western margin of the Korean Peninsula.

TL;DR: The Mesoarchean (ca. 3075Ma) Ivisaartoq greenstone belt in southern West Greenland includes variably deformed and metamorphosed pillow basalts, ultramafic flows (picrites), serpentinized ultramerafic rocks, gabbros, sulphide-rich siliceous layers, and minor siliciclastic sedimentary rocks.

TL;DR: Zircon SHRIMP U-Pb and in-situ Lu-Hf isotopic analyses via laser ablation microprobe-inductively coupled plasma mass spectrometer (LAM-ICPMS) of a tuff within the Upper Paleozoic from Western Beijing were carried out to give new constraints on volcano eruption ages and source area of the tuffs within the North China block (NCB).

TL;DR: In this paper, the authors focused on two key geological units located in the southern part of the Nico Perez Terrane (NPT), namely Carape Complex (CC) and Lavalleja Metamorphic Complex (LMC).

TL;DR: In this paper, an evolutionary model of the North Asian Craton is presented which shows that the basement is composed of Archean (55.0%), undifferentiated Archean and Paleoproterozoic (13.0%) and MesoproTERMES (12.0%).

TL;DR: In Central Iran, and the Saghand region along the Chapedony and Poshte Badam faults, the basement complexes show structural vestiges of Precambrian deformational, depositional, erosional, metamorphic and magmatic events.

TL;DR: The Pre-Uralides and Timanides are Pre-Ordovician complexes, located at the east and northeast portion of the East European Craton as mentioned in this paper, and they are interpreted to be subduction-related and/or affected by collision magmatism.

TL;DR: A study of the abundant and undescribed isolated and associated bones and teeth from the La Amarga Formation (Barremian of Neuquen, Argentina) permitted the recognition of additional clades of sauropod dinosaurs: basal titanosauriforms, both basal and derived titanosaurs, and rebbachisauroid diplodocoids as mentioned in this paper.

TL;DR: In this article, the Neoproterozoic Katangan Supergroup comprises a thick sedimentary rock succession subdivided into the Roan, Nguba, and Kundelungu groups, from bottom to top.

TL;DR: In this paper, the authors review petrographical and petrological characteristics of mantle peridotite xenoliths from the Western Pacific to construct a petrologic model of the lithospheric mantle beneath the convergent plate boundary.

TL;DR: The geology of west-central Madagascar is reviewed and reinterpreted in light of new field observations, Landsat Thematic Mapper image analysis, and U-Pb geochronology as mentioned in this paper.

TL;DR: In this paper, structural and petrological studies of the high P/T metamorphic belt in Timor-Tanimbar islands of eastern Indonesia have been conducted. And the authors conclude that the deep-seated high-p/T meta-belt extruded into shallow crustal levels as a first step, followed by doming at a later stage.