Showing papers in "Lithos in 2010"

TL;DR: In this paper, the authors introduce a new approach to quantitatively estimate the proportion of juvenile material added to the crust at any given time during its evolution, which is then used to model the crustal growth rate over the 4.56-Ga of Earth's history.

TL;DR: The Gangbian alkaline complex as discussed by the authors is composed of Si-undersaturated pyroxene syenites and Si-saturated to -oversaturated syenite and quartz monzonites.

TL;DR: In this article, the identification of a fossil arc-trench system from the ophiolite-decorated Solonker suture zone in the southernmost Central Asian Orogenic Belt (CAOB) enables us to constrain the timing of pre-subduction extension (ca. 299,290, and 280,280), subduction initiation (c. 281, 273, and 255,248), and slab break-off in the Permian.

TL;DR: In this paper, a series of experiments using a 2D petrological-thermomechanical numerical model of oceanic subduction was conducted to investigate the dependence of tectono-metamorphic and magmatic regimes at an active plate margin on upper-mantle temperature, crustal radiogenic heat production, degree of lithospheric weakening and other parameters.

TL;DR: In this paper, the SHRIMP and LA-ICP-MS zircon U-Pb ages were determined for seventeen plutons in northern West Junggar and these ages confirm the presence of Late Silurian-Early Devonian (SLED) granitoids.

TL;DR: In this article, the authors present an integrated study of the North China Craton (NCC) based on recent high-resolution seismic images combined with observations on surface geology, regional tectonics and mantle dynamics.

TL;DR: In this paper, a set of new SHRIMP zircon U-Pb geochronological, elemental and Sr-Nd-pb isotopic data for the Wusu and Yaxuanqiao basaltic rocks (the Mojiang area) along the Ailaoshan tectonic zone is presented.

TL;DR: The Gumushane pluton as mentioned in this paper is a high-K calc-alkaline I-type granodiorite/granite complex, which forms an important component of the pre-Liassic basement of the Eastern Pontides (NE Turkey).

TL;DR: In this article, the trace elements are directly linked to Lu-Hf isotopes in metamorphic zircons with reference to their U-Pb dates, which enables methodological integration to distinguish four types of metamorphically grown zircon: solid-state, replacement and dissolution recrystallizations of protolith zirons, and new growth from the aqueous fluid.

TL;DR: In this paper, the authors presented new SHRIMP zircon U-Pb chronology, major and trace elements, and Sr-Nd-Hf isotope data for five early Mesozoic granitic plutons across the Qinling orogen.

TL;DR: A granite-syenite-gabbro association from inland South China has been studied for zircon U-Pb ages and Hf isotopic compositions as well as whole-rock elemental and Sr-Nd isotope compositions to constrain their sources and tectonic settings as discussed by the authors.

TL;DR: Early Cenozoic (48-50-Ma) adakitic volcanic rocks from the Eastern Pontides, NE Turkey, consist of calc-alkaline and high-K calc-alkaline andesite and dacite, with SiO2 contents ranging from 56.01 to 65.44% as discussed by the authors.

TL;DR: In this paper, the authors carried out precise SIMS U-Pb zircon age determinations for a number of Cu-Au-Mo(Mo) mineralized porphyries and barren granitoid intrusions in the Jiurui and Edong mining districts in the middle reaches of the Yangtze River valley, revealing two discrete magmatic and mineralization events at ca 145-146 Ma and ca 140 Ma in the study area.

TL;DR: In this article, a series of diorites, tonalites, and granodiorites are found in the Neoarchean late to post-tectonic sanukitoid intrusions in the western part of the Karelian Province in Finland.

TL;DR: In this paper, a combined study of zircon U-Pb ages and Lu-Hf isotopes, mineral O isotope, whole-rock elements and Sr-Nd isotopes was carried out for Mesozoic granitoids from the Shandong Peninsula in east-central China, which tectonically corresponds to the eastern part of the Sulu orogen that formed by the Triassic continental collision between the South and North China Blocks.

TL;DR: The Shiquanzi gabbro was formed at 301 −± 6 ǫ Ma and consists of low-Si (LS) (SiO2 Â48 Âwt%) members, and both are characterized by high Nb (> 9 ¼ pm), high eNd(t) (+ −712 −+ 871) and low initial 87Sr/86Sr ratios (07030 −07041) as mentioned in this paper.

TL;DR: In this paper, the authors used a surface wave dataset with nearly 12,000 paths in the African region to estimate the depth of the lithosphere-asthenosphere boundary (LAB) in central and southern Africa.

TL;DR: The Gongshan block near the Eastern Himalayan Syntaxis is a fault-bounded block at the northern tip of the triangle-shaped Indochina continent (NIC), exposing in this block are late Paleozoic (Carboniferous to Permian) strata and a north-south belt of intermediate to felsic batholiths as discussed by the authors.

TL;DR: Most Cretaceous granitoids in the Jiaodong Terrane of Shandong Province, North China Craton were intruded between ~130 and 122 ǫ.

TL;DR: In this paper, the authors showed that during Mesozoic time the crustal growth occurred around the Hegenshan-Solonker suthanuture (HIMU-OIBs), which was subordinate to the Tan-Laurusian continent.

TL;DR: In this paper, the authors studied the timing and genesis of the major Ni-Cu-Co sulfide deposit in the Xiangshan intrusion based on newly obtained in-situ U-Pb, Hf and Re-Os isotopic analyses.

TL;DR: In this paper, an integrated and self-consistent geophysical-petrological methodology (LitMod3D) has been applied that combines elevation, gravity, geoid, surface heat flow, and seismic data and allows modelling of compositional heterogeneities within the lithospheric mantle.

TL;DR: In this paper, conodont age dating of the uppermost beds of the Maokou Formation in sections from Yunnan, Sichuan, Guizhou and Guangxi provinces was used to test the interpretation of the phenomenon of kilometre-scale pre-eruption domal uplift associated with mantle plume impingement on the base of the lithosphere.

TL;DR: Zircon U-Pb ages and geochemical data are reported for the Piqiang oxide-bearing ultramfic-mafic complex, the Bachu mafic dyke swarm, the Yingan and Kaipaizileike basalts and the Halajun A-type granites in the Tarim Block, Northwest China.

TL;DR: In this article, three plutons (Deh-Siahan, Bande-Bagh and Baghe-Khoshk Sharghi) in southwestern Kerman, in the southeastern part of the Urumieh-Dokhtar magmatic assemblage (UDMA) of the Zagros orogenic belt differ from the typical calc-alkaline metaluminous, I-type intrusions of the region.

TL;DR: In this article, the ages of two phases of Gejiu granitic intrusions have been analyzed by SHRIMP and/or LA-ICPMS zircon U-Pb techniques, yielding ages ranging from 77.4 ± 2.5 Ma to 85.0 ± 0.85 Ma.

TL;DR: In this article, the origin of the New Caledonia ophiolite (South West Pacific), one of the largest in the world, is investigated, and it is shown that the most depleted harzburgites are compositionally similar to the MORB of the Poya terrane, which is used to infer that the ultramafic nappe and the mafic Poya terrain represent oceanic lithosphere of a single marginal basin that formed during the late Cretaceous.

TL;DR: In this paper, the authors reported zircon U-Pb and Hf CUU data for the intrusive rocks and minor dacites in the Lamasu-Dabate area of northwestern Tianshan adjacent to the Cu-Au-Mo deposits.

TL;DR: In this paper, the modal mineralogy, microstructure, and whole rock major, trace and oxygen isotope compositions of the protolith and migmatites were investigated to; 1) determine the melting reaction, 2) find microstructural criteria for identifying residual rocks in leucocratic systems where there is no melanosome, and 3) to determine the source of the fluid involved in anatexis.

TL;DR: The lithosphere-asthenosphere boundary (LAB) represents the base of the Earth's lithosphere, the rigid and relatively cool outer shell characterised by a conductive thermal regime, isolated from the convecting asthenosphere as mentioned in this paper.