Showing papers in "Lithos in 2008"

TL;DR: Two geochemical proxies are particularly important for the identification and classification of oceanic basalts: the Th-Nb proxy for crustal input and hence for demonstrating an oceanic, non-subduction setting; and the Ti-Yb proxy, for melting depth and hence indicating mantle temperature and thickness of the conductive lithosphere as mentioned in this paper.

TL;DR: A detailed time scale for an orogenic cycle (oceanic accretion-subduction-collision) that provides significant insights into Paleozoic continental growth processes in the southeastern segment of the long-lived Central Asian Orogenic Belt (CAOB) is presented in this article.

TL;DR: In this article, the authors focus on the key geodynamic constraints provided by the subduction-related magmatism of the upper plate, which shifted ~ 300 km inward from the SSMA to the UDMA at the end of the Mesozoic.

TL;DR: In this paper, the Shenwu dolerite dykes, the Daolinshan granite-diabase complex, and Shangshu bimodal (basalt-rhyolite) volcanic rocks were studied for mid-Neoproterozoic igneous rocks in northern Zhejiang Province, China.

TL;DR: The 1.78 Ga Xiong'er Volcanic Province (XVP) and coeval North China giant mafic Dyke Swarm (NCDS) are the most important magmatic events occurring after the amalgamation of the North China craton (NCC) as discussed by the authors.

TL;DR: The Middle Jurassic Mirdita Ophiolite in northern Albania is part of an ophiolites belt occurring between the Apulian and Pelagonian subcontinents in the Balkan Peninsula as discussed by the authors.

TL;DR: In this article, the authors examined two Mesozoic basalt successions in South China, one parallel and the other oblique to the convergence boundary between the paleo-Pacific plate and South China continent, to constrain the influence of this presumed subduction system on mantle composition.

TL;DR: Zhang et al. as discussed by the authors conducted a systematic dating of volcanic rocks in the Great Xing'an Range in order to rectify the limited precise age data for the volcanic rocks, which significantly hinders understanding of the petrogenesis and geodynamic setting of these rocks.

TL;DR: In this paper, the authors present the first numerical modeling results that address for a hotter Earth the viability of subduction, one of the main requirements for plate tectonics, and show that eclogitization significantly relaxes this limitation for a developed, ongoing subduction process.

TL;DR: In this article, the authors used SHRIMP zircon U-Pb isotopic data to date the Emeishan flood basalts to ca. 260 ǫ m.

TL;DR: In this article, the Gangdese batholith is interpreted as a newly underplated, mafic lower crust, rather than the subducted Neo-Tethyan oceanic crust.

TL;DR: In this article, a multi-stage lithospheric thinning model is proposed based on the new data, which could be derived from a newly enriched lithosphere mantle hybridized by partial melts from the foundered lower continental crust.

TL;DR: Zircon U-Pb ages and trace elements were determined for granulites and gneiss at Huangtuling, which are hosted by ultrahigh-pressure metamorphic rocks in the Dabie Orogen, east-central China as mentioned in this paper.

TL;DR: In this paper, an eclogite-facies transport vein, its host and the reaction zone (blueschist-alteration zone), which is located in the central part of the vein.

TL;DR: In this article, the authors used surface wave tomography to estimate the shear wave velocity of fundamental and higher mode Rayleigh waves, which can be used to map the lithospheric thickness, and found that the strength of the cores lies in the dry crust, which is insulated from the hot convecting mantle by the thick buoyant lithosphere.

TL;DR: A number of models of continental collision already exist, but the role of variable coupling between plates still remains to be explored in addition, heat generation by radioactive decay may be quite variable as discussed by the authors.

TL;DR: The Wudumen and Erliba plutons as discussed by the authors have a SHRIMP zircon U-Pb ages of ∼ 735 ǫ ma and have high K2O (0.8-3.6), Na2O(4.4-6.4), and low MgO(0.4 −1.7) ratios.

TL;DR: In this paper, the formation and exhumation of coesite-and diamond-bearing rocks metamorphosed at 700 to 900°C in the presence of dense supercritical silicate fluids and melts may be explained by a transient hot channel effect.

TL;DR: In this article, the authors presented the results of the isotopic compositions of Mesozoic mafic rocks across the Chenzhou-Linwu Fault within the South China Block to constrain the characteristics and evolution of the mesozoic mantle source.

TL;DR: In this paper, three types of eclogite, together with a serpentinized harzburgite, coexist as blocks within granitic and pelitic gneisses along the Shaliuhe cross section, the eastern part of the North Qaidam continental-type ultrahigh-pressure metamorphic belt, NW China.

TL;DR: In this article, the authors used SHRIMP U-Pb dating results to show that the granites in the Sawuer region were formed between 337-Ma and 290.7-Ma (late Carboniferous and early Permian).

TL;DR: A variety of high Ba-Sr granites and syenites is intruded into the Caledonian terrane of the Northern Highlands of Scotland as discussed by the authors, where the parent magmas were derived from a parent parent MAGMA Array (CPMA) that extended from isotopically depleted to significantly enriched compositions.

TL;DR: The magnitude of tectonic pressure is determined by a non-dimensional pressure parameter, reflecting geometry and position, and a scaling factor, with units of stress (Pa), given by the strength of the rock as discussed by the authors.

TL;DR: The Emeishan flood basalts are part of an important large igneous province (LIP) along the western margin of the Yangtze Block, Southwest China as mentioned in this paper.

TL;DR: The Middle Eocene volcano-sedimentary units of Northern Anatolia are confined into a narrow zone trending parallel to the Intra Pontide and Izmir-Ankara-Erzincan sutures, along which the northern branch of the Neotethys Ocean was closed during a period between Late Maastrichtian and Paleocene.

TL;DR: Gerya et al. as mentioned in this paper presented a comprehensive petrological and geochronological data on three exemplary samples of eclogite and blueschist, which allowed a series of different but interrelated pressuretemperature-time paths to be delineated.

TL;DR: In this article, the effects of element fractionation on composition and modes of the co-genetic metamorphic phase assemblage were investigated in high and ultra-high pressure rocks.

TL;DR: In this paper, peridotite xenoliths from Tertiary alkali basalts in Yangyuan and Fansi were analyzed for identifying and characterizing the relics of ancient lithospheric mantle that survived lithosphere removal in the western North China Craton (NCC).

TL;DR: The relationship between the breakup of eastern Gondwanaland and the Kerguelen plume activity is a subject of debate as discussed by the authors, and Cona mafic rocks are widely exposed in the Cona area of the eastern Himalaya of south Tibet, and are studied in order to evaluate this relationship.

TL;DR: The Emeishan continental flood basalt (ECFB) sequence in Dongchuan, SW China comprises a basal tephrite unit overlain by an upper tholeiitic basalt unit as mentioned in this paper.