Showing papers in "Lithos in 2020"

TL;DR: The formation of the Himalaya was associated with the exhumation of high-grade metamorphosed rocks of the Higher Himalayan sequence (HHS) complex, which underwent amphibolite-, granulite- to eclogite-facies metamorphism and anatexis as discussed by the authors.

TL;DR: In this article, a new machine learning method for calculating biotite structural formula from EMPA data is presented, which is based on principal components regression (PCR) of a dataset consisting of 155 fully analyzed Biotite references that have chemistry and crystal structure refinement.

TL;DR: In this paper, the isotopic systematics of East African magmatism reveal significant complexity as to the specific reservoirs that may participate in the melting processes noted above, and the isotope characteristics of magma suites from throughout the region form arrays that broadly converge on the composition of the Afar Plume, despite some complexity where the plume material has formed a hybrid plume-lithosphere component.

TL;DR: The Pusila pluton is located 44 km northwest of Mount Everest, and consists of two-mica granite, muscovite granite, albite granite, and pegmatites as mentioned in this paper.

TL;DR: In this paper, a distinct phase in the life of Stromboli volcano is evident from the 2003 paroxysm onwards, and the authors compare clinopyroxenes from the present-day and Post-Pizzo eruptions.

TL;DR: In this paper, the authors used whole-rock major and trace element data and mineral compositions for the leucogranitic rocks in the eastern Himalayan Cuonadong dome, southern Tibet.

TL;DR: In this paper, the authors determined that muscovite monzogranite also has a close spatial relationship with the Nb Ta pegmatites and presented new U-Th-Pb ages for coltan, monazite, and zircon that constrain the timing of NbTa mineralization and related magmatism.

TL;DR: In this paper, the authors conducted a comprehensive geochemical and petrographic investigation of kimberlites from eight pipes in the Kaavi-Kuopio field in Finland, which were emplaced on the southern margin of the Karelian craton during the Neoproterozoic.

TL;DR: In this paper, the authors used zircon U Pb data together with ages in literature to show that these granitoids represent long-lasting magmatism from the early (T1, ~251-248) Ma, middle (T2, ~247-238 Ma) to late (T3, ~234-214) Ma) Triassic.

TL;DR: In this paper, a detailed geochemical and geochronological study of the Nashwaak Granite is presented, and compared with coeval granites in this region to indicate a Late Silurian-Early Devonian slab break-off regime in the Canadian Appalachians.

TL;DR: In this paper, the authors used the LCT (Li-Cs-Ta) group of pegmatites in the Songpan-Garze Fold Belt (SGFB), West Sichuan, China.

TL;DR: In this paper, the authors used U Pb SHRIMP contextual in-situ (thin section) dating of baddeleyite and zircon from six samples of three different dyke swarms in the southern Sao Francisco Craton, in addition to novel lithogeochemical and Nd Sr isotopic data, allow to pinpoint dyke emplacement at ca. 2.5-3.0 ǫ.

TL;DR: In this paper, a set of new zircon U Pb and Hf O isotopic analyses were presented, and whole-rock elemental and Sr-Nd-Pb isotopic data for the mafic-intermediate igneous rocks in South Laos.

TL;DR: Li-poor and Li-rich pegmatites were formed by the melt-fluid separation during the late stage of granitic magma evolution, which resulted in the leaching and reprecipitation of ore-forming elements, but produced restricted Li isotope fractionation.

TL;DR: In this paper, a study of whole-rock geochemistry, Sr-Nd isotopes, and zircon U-Pb-Hf isotopes for newly recognized Late Mesoproterozoic S-type granites, including two mica-, biotite-, garnet-bearing two-mica granites from the western Yangtze Block, was conducted.

TL;DR: Zhang et al. as mentioned in this paper reported new geochronological and geochemical data of A-type granites from the western Wulonggou and the eastern Gouli areas in the East Kunlun Orogen to deepen their understanding of the late stage evolution of the Proto-Tethyan Ocean and the configuration of peri-Gondwana microcontinents during the Silurian- Devonian is under debate.

TL;DR: In this article, the geochronology and geochemistry of the Late Mesozoic volcanic rocks collected from the southern Great Xing'an Range, in order to constrain the tectonic evolution of the great Xing'san Range in the Late-Mesozoic time are examined.

TL;DR: The Schistes Lustres metasedimentary complex, exposed in the Italian and French Alps, is a regionally extensive unit of blueschist to eclogite facies marble, calc-schist and metapelite providing a record of sediment underplating and fluid-rock interaction at 40-65 km of a paleo-subduction zone as mentioned in this paper.

TL;DR: In this paper, the authors presented geochronological, whole-rock major and trace element geochemical, and Sr-Nd-Hf isotopic data of magmatic rocks within the Kengdenongshe polymetallic deposit in the eastern part of the East Kunlun Orogen.

TL;DR: In this article, the authors present new zircon U-Pb as well as geochemical-isotopic data from plutonic (granite to gabbro) and volcanic (basalt to rhyolite) magmatic rocks of a Cadomian retro-arc rifted basin from Zarand in SE Iran.

TL;DR: The plagioclase phenocrysts are zoned, with high An% cores characterized by resorption textures and mantled by euhedral low-An% rims as discussed by the authors.

TL;DR: In this article, zircon U-Pb ages and Hf-O isotopes are presented for the oldest known igneous rocks in the Southern Qiangtang Terrane/Microcontinent (SQT), Central Tibet.

TL;DR: In this article, the authors describe the transformation from harzburgite protolith to listvenite (quartz + magnesite/± dolomite + relict Cr-spinel) in the late Cretaceous mantle peridotite of the Birjand ophiolite of Iran.

TL;DR: In this paper, electron probe microanalysis (EPMA) and laser ablation inductively coupled mass spectrometry (LA-ICPMS) spot and mapping results for a suite of base metal sulphide (pentlandite, pyrrhotite, chalcopyrite), native metal (Cu and Fe) and Ni-Fe alloy (awaruite) from variably serpentinized peridotite and pyroxenite (Late Permian to Early Triassic Nahlin ophiolite, Cache Creek terrane; Atlin, British Columbia

TL;DR: The trace element and radiogenic isotope systematics of clinopyroxene have frequently been used to characterise mantle metasomatic processes, because it is the main host of most lithophile elements in the lithospheric mantle as discussed by the authors.

TL;DR: The Sakarya Zone (northern Turkey) is a Gondwana-derived continental block accreted to northern Laurussia during the Carboniferous, and is regarded as the eastward extension of Armorica as discussed by the authors.

TL;DR: In this article, the authors show that the Chu Lai and Dai Loc granites have similar zircon Hf isotopes and inherited-zircon age spectra, suggesting that they probably were derived from different degrees of partial melting of the same late Neoproterozoic meta-greywacke source at different crustal levels.

TL;DR: A comparative study of the temporal development of magmatism in both rifts, and within the interposing Turkana Depression, is presented in this article, which suggests widespread pulsed basaltic events precede silicic flareups throughout the East African Rift System, and the lack of such flare-ups in Turkana may relate to the Mesozoic rifting that modified the continental lithosphere in that region.

TL;DR: In this article, the authors reported new whole-rock major and trace element, Sr Nd isotopic, and zircon U Pb and Hf O isotopic data for Late Triassic intrusive rocks on Liaodong Peninsula, NE China, aiming to constrain the petrogenesis of these rocks in terms of lithospheric thinning in the northeastern North China Craton (NCC).

TL;DR: In this article, the presence of iron carbides in placer diamonds from the northeastern region of the Siberian craton was demonstrated for the first time, and it was found that the inclusions are polycrystalline aggregates, and the iron carbide filling the fissures in the diamonds provided clear evidence that the iron melts were captured first.