Showing papers in "Lithos in 2001"

TL;DR: In this paper, the authors consider some of the special problems involved in the study of fluid inclusions in ore deposits and review the methodologies and tools developed to address these issues, and conclude with a look to the future and addresses the question of where fluid inclusion studies of hydrothermal ore deposits may be heading in the new millenium.

TL;DR: Based on petrographic, major and trace element, and Sr-Nd isotope data, the Emeishan basalts can be classified into two major magma types: (1) a low-Ti (LT) type that exhibits low Ti/Y ( 500), and (2) HT2 lavas are compositionally similar to the HT1 lavas but show conspicuous depletion in U and Th as discussed by the authors.

TL;DR: For many kinds of fluid inclusions, the coupling of microthermometry and Raman microspectrometry is still the only viable option to obtain compositions of single fluid-inclusions as mentioned in this paper.

TL;DR: In this paper, the ages of two highly evolved granitic plutons, Woduhe and Baerzhe, from the Great Xing'an Mountains were constrained at 130±4 Ma for the Wodahe and 122±5 Ma for BaerZhe granites by Rb-Sr and Sm-Nd isotope analyses.

TL;DR: In this article, a procedure of fluid inclusion studies is proposed with emphasis on the criteria of selecting fluid inclusions for detailed (microthermometry and spectroscopic) analysis, and a detailed overview of descriptive and genetic classifications of fluid-inclusions in single crystals and in massive rocks is given with the intention of further differentiating the commonly used terms ‘primary’ and ‘secondary’ fluidinclusions.

TL;DR: In this paper, the authors use fluid inclusions in sedimentary and diagenetic minerals to provide a record of the distribution and composition of these fluids from the past, which can contribute significantly to studies of paleoclimate and global-change research, and provides useful information in petroleum geology.

TL;DR: The fluid inclusions preserved in high and ultra-high pressure rocks provide direct information on the compositions of fluid phases evolved during subduction zone metamorphism, and on fluid-rock interactions occurring in such deep environments as mentioned in this paper.

TL;DR: Xenolith-bearing Neogene basalts occur in Hebi county, at the southern end of the Taihangshan-Luliangshan paleo-rift zone in the North China block of the Sino-Korean craton.

TL;DR: In this article, it was shown that melts generated in the crust at high temperature and low water activities (such as A-type granites) contain higher water contents than previously assumed (up to 20% at 800-900°C and 3-7 kbar).

TL;DR: In this paper, a review of the basic principles for the study of fluid inclusions in metamorphic rocks are reviewed and illustrated, and three essential steps in any fluid inclusion investigation are described: observation, measurements and interpretation.

TL;DR: In this article, a detailed petrographic study was conducted to characterise silicate-melt inclusion primary characters and posttrapping evolution, including melt crystallisation, and high temperature studies were conducted to rehomogenise the inclusion content and select chemically representative inclusions.

TL;DR: Fluid inclusions in olivine and pyroxene in mantle-derived ultramafic xenoliths in volcanic rocks contain abundant CO2-rich fluid inclusions, as well as inclusions of silicate glass, solidified metal sulphide melt and carbonates as mentioned in this paper.

TL;DR: In this paper, the authors used trace element patterns of the diopsides (analysed by laser ablation-ICPMS) from the Cr-diopside series spinel lherzolites and associated layered ultramafic xenoliths to infer the geothermal properties of the region.

TL;DR: A review of analytical and modelling methods for petroleum in fluid inclusions can be found in this article, where four types of data are considered: textures, fluid composition, fluid properties and pressure-temperature of trapping.

TL;DR: In this article, two petrographically different syenite suites can be distinguished in the mostly Archean Ntem Complex of Cameroon: a suite of two-pyroxene syenites and a suites of clinopyroxene Syenites.

TL;DR: In this paper, the phase relations of the binary are described with respect to a qualitative P-T-X model, and isoplethic-isochoric paths through this model are used to explain the equilibrium and non-equilibrium behaviour of fluid inclusions during microthermometric heating and cooling.

TL;DR: In this paper, the final textures, mineral modes and mineral chemistries are affected by four successive processes: (i) prograde partial melting and small-scale segregation into melt-rich domains and restitic domains; (ii) partial melt extraction; (iii) partial retrograde reactions (back reaction) between in situ crystallizing melt and the restite; (iv) crystallization of remaining melt at the solidus, releasing volatiles.

TL;DR: In this paper, the authors used the trace element, rare earth element and Sm-Nd isotopic data to estimate the peak metamorphic age of eclogites from the western segment of the Altyn Tagh fault.

TL;DR: In this paper, the authors show that the mineral properties of the Tubaf mantle xenoliths are the product of two major processes: an early partial melting depletion event that was overprinted by oxidation and alkali enrichment related to percolation of slab-derived, hydrous melts.

TL;DR: In this article, microstructural criteria and kinetic arguments are used to infer that the coarse garnet-quartz association develops during prograde dehydration melting because of the relatively low mobility of Al and Si compared with reaction rate, and that direct retrograde reaction with melt produced coarse radiating clusters of biotite and sillimanite.

TL;DR: In this paper, a pre-pilot drillhole CCSD-PP1, Chinese Continental Scientific Drilling Project (CCSD), with depth of 432 m, is located in the Donghai area in the southwestern Sulu terrane, where the core samples are mainly comprised of paragneiss, orthogneiss and ultramafic rock with minor intercalated layers of eclogite and phengite-bearing kyanite quartzite.

TL;DR: The Estancia Glencross Area (EGA) volcanic rocks form a series of five isolated buttes located at the southern end (∼52°S) of the discontinuous belt of Cenozoic basaltic lava formations occurring in the extra-Andean Patagonia.

TL;DR: In the Caledonian orogen of East Greenland, superb exposure along steep fjord walls allows direct observation of the origin of ca. 435 Ma S-type granites by anatexis of paragneisses, and collection of the resulting melts into wider sheets and plutons as mentioned in this paper.

TL;DR: In this article, the authors compared geochemical, geochemical and petrological data, and zircon populations as well as isotope and geochronological data for the major gneiss units of the Eastern Erzgebirge region.

TL;DR: The Cowra Granodiorite is a relatively mafic, enclave-rich, S-type pluton in the Lachlan Fold Belt, which has been cited as a type example of a restitic origin for all varieties of enclaves in S type granites.

TL;DR: In this article, the atomic H/O ratio of the fluid is calculated using the XCO2/(XCO2+XCH4) ratio, which can be used for C-O-H model calculations.

TL;DR: The Tsaolingshan lavas from Taiwan's Northern Taiwan Volcanic Zone as mentioned in this paper have been shown to have a similar composition to the Group I ultrapotassic orogenic lamproites from central Italy, Span and Tibet.

TL;DR: In this paper, a detailed examination of the mineral assemblage and compositional evolution in spatially related lithologies, so that realistic geothermobarometric comparisons can be made.

TL;DR: In this article, the authors suggest that the factors which controlled the generation and evolution of the Carpathian volcanic arc were complex, and they suggest that magmagenesis is closely related to the complex geotectonic evolution of Carpathians.

TL;DR: The first direct determination of the oxygen fugacities (fO2) of potassic igneous rocks from the vicinity of epithermal gold mineralization at Lihir Island, Papua New Guinea, was reported in this article.