Showing papers in "Lithos in 2014"

TL;DR: A review of the nature, petrogenesis and global evolution of late-Archean granitoids and their geodynamic significance can be found in this article, where the authors classify granitoid types into four groups: volumetrically dominant and juvenile tonalites, trondhjemites and granodiorites (TTGs).

TL;DR: However, recent geochemical and experimental evidences indicate that formation of TTG-like basalts required a LILE-enriched source, similar to oceanic plateau basalts as mentioned in this paper.

TL;DR: In this article, a plume incubation model is proposed to account for the temporo-spatial distribution of the Tarim LIP, in which different styles of plume-lithosphere interaction are recognized.

TL;DR: In this paper, high-resolution chemical abrasion-thermal ionization mass spectrometry (CA-TIMS) zircon U-Pb techniques have been used on the felsic ignimbrite at the uppermost part of the Emeishan lava succession.

TL;DR: Zircon U-Pb dating shows that these intrusions formed in two periods in the Jurassic (169-150-Ma) and Cretaceous (127-113-Ma), and they mostly belong to the high-K calc-alkaline series.

TL;DR: A review of previous work relevant to the formation of concentrations of chromite in peridotites from ophiolitic (s.l.) sequences highlights some of the key problems in understanding the complex processes involved as discussed by the authors.

TL;DR: Based on the spatial distribution of the Paleoproterozoic metamorphic events (M 1 - 4 ), and of the coeval igneous rocks, the authors speculate that the assembly of the North China Craton was created by one orogen, which formed between the Eastern and Western Cratons in two tectonic stages: two marginal arcs, the Korean and Xuwujia, developed against both eastern sides of the two sub-cratons, and were both accreted and deformed at 1965-1900 ǫ-Ma (M 3 − 4

TL;DR: The Meso-Tethyan oceanic plateau of central Tibet has been found to contain pillow basalt and ultramafic intrusives and cumulates, along with other blocks of limestone, radiolarian chert, graywacke, and shale as discussed by the authors.

TL;DR: In this paper, four mineralization-related granite bodies (G1 to G4) were identified in the Dahutang mining area, including the porphyritic-like two-mica granite (G 1) (the size of its phenocrysts is from 0.2.2

TL;DR: The Sangri Group volcanic rocks are distributed along the southern margin of the Lhasa Terrane on the northern side of the Indus-Yarlung Zangbo suture zone.

TL;DR: In this article, an overview of internal zonation within granitic pegmatites consists of four principal parts: (1) a historic review of the subject, (2) a summary of the current understanding of the pegmatite-forming environment, (3) the processes that determine mineralogical and textural evolution in pegmatitic zones, and (4) the applications of those processes to each of the major zones.

TL;DR: In this article, an updated worldwide compilation of U/Pb, Hf-isotope and trace-element data on zircon, and Re-Os model ages on sulfides and alloys in mantle-derived rocks and xenocrysts was integrated to examine patterns of crustal evolution and crust-mantle interaction from 4.5-3.4-Ga ago.

TL;DR: In this paper, the authors presented new zircon U-Pb dating, Hf isotope, major and trace elements, and Sr-Nd isotope data for Early-Middle Triassic intrusive rocks in the Erguna Massif of NE China, in the eastern segment of the Central Asian Orogenic Belt.

TL;DR: In this paper, the authors used zircon LA-ICPMS U-Pb isotopic data of intrusive rocks from Larelaxin and Caima plutons in the southern margin of the Western Qiangtang subterrane to provide important evidence of northward subduction of the Bangong-Nujiang Tethyan Ocean lithosphere.

TL;DR: In this paper, the authors present petrological, geochronological and geochemical results of the Ramba leucogranites that crop out in the center of Ramba dome within the Tethyan Himalaya.

TL;DR: In this article, high temperature Mo isotope fractionation in a hydrous supra-subduction volcano-plutonic system (Kos, Aegean Arc, Greece) was investigated to address the debate on the δ 98/95 Mo variability of the continental crust.

TL;DR: In this article, the authors present zircon geochronologic (LA-ICPMS and ID-TIMS), trace element and Hf isotopic evidence for a complex evolution of the plutonic roots of the Eocene Coroccohuayco porphyry system, southern Peru.

TL;DR: The trace element content in zircons from A-type granites and rhyolites was investigated by using backscattered electron images and electron microprobe analyses as discussed by the authors.

TL;DR: In this paper, a geologic investigation was undertaken in the Hoh-Xil-Songpan-Ganzi (HXSG) complex, northern Tibet in order to better understand magma genesis and evolution during the late stages of Paleo-Tethys ocean closure.

TL;DR: In this article, the authors report new major and trace-element mineral data for mantle peridotite xenoliths, obtained from the Late Devonian Udachnaya and the Late Jurassic Obnazhennaya kimberlites, which bracket the thermal climax of the Siberian superplume.

TL;DR: In this article, the authors conducted a whole-rock geochemical, U-Pb zircon geochronological, and in situ Zircon Hf-OI sotopic compositional study of rocks in southern Tibet from the Langxian igneous suite (including a lamprophyre dyke, mafic enclaves, a granodiorite, and a two-mica granite) and the Nuri suite (a quartz-diorite).

TL;DR: In this article, the authors report geochemical, isotopic and geochronological data that define an ~ 1500 km long belt of S-type meta-granites along the Andes of Colombia and Ecuador, which formed during 275-223 Ma.

TL;DR: In this article, a combined study of whole-rock major-trace elements and Sr-Nd-Pb-Hf isotopes was carried out for Mesozoic andesitic-basaltic volcanics from the Luzong basin in the Middle-Lower Yangtze River Belt, South China.

TL;DR: The Hillside Cu-Au mine in South Australia as mentioned in this paper is characterized by a skarn-style alteration zone, and an analysis of feldspar, calcite, skarn minerals (garnet, pyroxene, clinozoisite and actinolite) and accessories (titanite, apatite and allanite), and grain-scale element mapping by laser-ablation inductively-coupled plasma mass spectrometry are used to assess the distributions of rare earth element (REE), incompatible and ore-forming elements in

TL;DR: In this article, the major and trace-element compositions, zircon U-Pb dates, and Sr-Nd-Hf isotopic compositions of these rocks were investigated.

TL;DR: Zhang et al. as mentioned in this paper used SHRIMP zircon U-Pb dating data of the Late Cretaceous Zhuogapu volcanic rocks in the northern Lhasa subterrane to provide a new insight into tectonic processes following the collision of the terrane with the Qiangtang zone.

TL;DR: In this paper, the authors assessed how different U contents and degrees of metamictization have affected the SIMS U-Pb and oxygen-isotope signatures of zircon-quartz pairs from the U-rich A-type granites from Suzhou (southern China).

TL;DR: In this paper, the in situ analytical results of oscillatory zoned garnets from core to rim demonstrate that garnet cores are remarkably HREE-rich, with relatively high ∑REE and HREE/LREE ratios as well as negative Eu anomalies.

TL;DR: The Shaerhu complex is a product of mantle-derived alkaline magma fractionation, which is one of the main mechanisms of A-type granite genesis as discussed by the authors, and the geochemical properties indicate that the rocks of the complex have the same source and that fractionation was important in their generation.

TL;DR: The Katerina ring complex is characterized by a large diversity of A-type felsic igneous rocks: quartz syenite porphyries, microsyenites, quartz monzonites, aluminous syenogranites, alkali feldspar granites and aplites, and peralkaline granites.