Earth and Planetary Science Letters

Earth and Planetary Science Letters

Landsat Image provided by Ronald W. Lunar and Planetary Science XX, pp. Impact evidence from Massignano, Arcona. Dense fluid inclusions and their petrological significance abstract. Russian , Mineralogicheskii Zhurnal, v. International Geology Review, v. Geological Society of America, Special Paper , pp. Mineralogicheskoye Obshchestvo Zapiski, v.

Rubidium–strontium dating

Evidence for the Neoarchean convergence-related evolution of the Eastern Dharwar Craton and its schist belts, Lithos, v , Surajit Mondal and Ramananda Chakrabarti, , A novel sample loading method and protocol for monitoring sample fractionation for high precision Ca stable isotope ratio measurements using double-spike TIMS, J. Sengupta, , Economically viable rare earth element deposits along beach placers of Andhra Pradesh, eastern coast of India, Arab.

Chakrabarti and Sourav Mandal, , Geochemical anatomy of a spheroidally weathered diabase, Chemical Geology, v.

The Planetary and Space Science Centre (PASSC) opened in April, and was the first facility of its kind in Canada.

Jena Verlag von Gustav Fischer. Bivalve paleogeography and the Hispanic corridor: Paleogeography, Paleoclimatology and Paleoecology, Ridge collision, slab-window formation, and the flux of Pacific asthenosphere into the Caribbean realm. Palabras de apertura , Palabras , Comunicaciones , Notas. Acevedo del Monte, E. Ciencias de la Tierra y el Espacio, 7: Influencia del Cuaternario en el desarrollo del relieve de Cuba occidental: Bulletin of the Venezuelan Speleology Society, 5 El Sistema Cavernario Majaguas-Cantera.

Pyrochlore

Constraints from zircon dating of the Salisbury Kop Pluton. Paleoproterozoic granulite-facies metamorphism and granitoid intrusions in the Ubendian-Usagaran Orogen of northern Malawi, east-central Africa. Paris, Earth and Planetary Sciences, Rare earth element distribution as tracer of the genetic relationship between smectite and palygorskite of marine phosphorites. Deformed A-type granites in northern Malawi, east-central Africa: Mineralogy and Petrology,

Sm–Nd radiometric dating Samarium has five naturally occurring isotopes, and neodymium has seven. The two elements are joined in a parent–daughter relationship by the alpha decay of Sm to Nd with a half-life of × 10 11 years and by the alpha decay of Sm (an almost-extinct nuclide with a half-life of × 10 8 years) to produce Nd.

Implications for the Cenozoic mantle replacement in southwestern China. Implications for geodynamic change of the accretionary orogenic belt. Mesoproterozoic emplacement and enriched mantle derivation of the Racherla alkali syenite, Palaeo-Mesoproterozoic Cuddapah basin, southern India: Insights from in situ Sr-Nd isotopic analysis on apatite. Palaeoproterozoic of India ed.

Late Cretaceous-Paleogene stratigraphic and basin evolution in the Zhepure Mountain of southern Tibet: Identification of Early Carboniferous granitoids from Southern Tibet and implication for terrane assembly related to the Paleo-Tethyan evolution. Early Eocene crustal thickening in southern Tibet: New age and geochemical constraints from the Gangdese batholith.

New constraints on the last residue of the Lunar Magma Ocean. Mesozoic accretion of juvenile sub-continental lithospheric mantle beneath South China and its implications:

The Geological and Tectonic Framework of Europe

Presented below are the research topics that Ph. However, the emergence and early evolution of two fundamental characteristics of divergent plate boundaries, segmentation and magmatism, are not well understood because most studies focus on mature or successfully rifted margins. Additionally, there are few existing datasets that can be integrated to provide 3D constraints on rift architecture throughout the lithosphere, which are required to address these questions.

This investigation produced estimates of mantle temperature and melt content within the rift and also highlighted the potential location of melt segregation along a steeply dipping lithosphere-asthenosphere boundary.

Ordering Instructions This book was originally published in paper form in February (design and coordination by Martha Kiger; illustrations and production by Jane Russell).

These deposits are genetically associated with equigranular and porphyritic tonalite, granodiorite and diorite. Therefore, Juvenile sources played a significant role in the generation of fertile magmas for porphyry-Cu and -Au style mineralization in the CAOB. Mineralizing intrusions include the adakitic, transitional, and normal arc rocks. Mineralizing intrusions in some porphyry Cu -Mo deposits e. These adakitic rocks were formed by partial melting of thickened lower crust at depths of N40 km.

These transitional rocks were formed by the MASH melting, assimilation, storage, and homogenization processes at depths of b40 km and AFC assimilation and fractional crystallization processes in a midcrustal magma chamber. One large porphyry Cu-Au deposit e. Here, three genetical models are suggested for these mineralizing magmas in the CAOB: A majority of transitional and normal arc magmas suggest that thinner crust was important to the formation of porphyry Cu -Au and Au deposits that dominate in the CAOB.

Our geochronology and geochemistry results indicate that most of the mineralizing intrusions from the porphyry deposits in the CAOB formed in island arc settings from the Cambrian to Triassic. The intrusions at Erdenet, Koksai and Yubileinoe are exceptions, forming in continental arcs in the Permian, Silurian and Devonian, respectively. The greatest metal endowment is associated with the Devonian porphyry deposits to Ma, e.

The largest number of porphyry deposits were emplaced in the Carboniferous to Ma, e.

Geology of Japan

Geochemical transition shown by Cretaceous granitoids in southeastern China: Implications for continental crustal reworking and growth. Petrogenesis of the Cretaceous Zhangzhou batholith in southeastern China:

U–Pb zircon dating shows that the magma crystallization ages of ± 3 Ma for the Shuangpengxi pluton and ~– Ma for the Xiekeng pluton. Geochemical and Sr–Nd–Hf isotopic compositions reveal that the magma of the Shuangpengxi granodiorite was derived from partial melting of crustal materials.

This area is critical for adequate understanding of the interactions between the northern i. Analyses of magmatically zoned zircons from orthogneiss samples yield ages of These ages are very similar to the Neoproterozoic rocks that form the basement of Gondwana-derived terranes across North America and Europe.

The position of the Sredna Gora Zone outboard of other Gondwana-derived terranes, along with the Late Neoproterozoic igneous emplacement age, lead us to suggest that the Sredna Gora Zone represents a continuation of the Gondwana-derived terranes that are presently positioned along the eastern end of Laurentia and the southwestern margin of Baltica. Zircons from a leucosome enclosed in migmatitic paragneisses contain ubiquitous, high-U, homogeneous metamorphic rims that yield an age of This age of metamorphism is indistinguishable from other published ages of Variscan metamorphism across Central and Western Europe.

Cores of zircon grains in the leucosome have variable interior zoning patterns, and are interpreted as original detrital material in the parent sedimentary rock. Collectively, these data suggest that both Gondwana-derived terranes and the Variscan Orogeny extend much farther eastward in southern Europe than has been previously recognized. Implications for evolution of the subcontinental lithospheric mantle Ultramafic and mafic xenoliths from the Cima volcanic field, southern California, provide evidenc Igneous-textured pyroxenites and gabbros like the dike rocks also occur abundantly as isolated xenoliths inferred to represent underplated crust.

Mineral and whole rock trace element compositions among and within the different groups of xenoliths are highly variable, reflecting multiple processes that include magma-mantle wall rock reactions, episodic intrusion and infiltration of basaltic melts of varied sources into the mantle wall rock, and fractionation. The igneous-textured pyroxenites and gabbros are therefore inferred to be related to the host rocks as earlier cogenetic intrusions in the mantle and in the lower crust.

Two samples of peridotite, one modally metasomatized by amphibole and the other by plagioclase, have isotopic compositions intermediate between the igneous-textured xenoliths and the mantle rock, suggesting mixing, but also derivation of the metasomatizing magmas from two separate and distinct sources.

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The two elements are joined in a parent—daughter relationship by the alpha decay of Sm to Nd with a half-life of 1. Some of the Sm may itself have originally been produced through alpha-decay from Gd , which has a half-life of 1. To find the date at which a rock or group of rocks formed one can use the method of isochron dating. From the slope of the “isochron” line through these points the date of formation can be determined. Alternatively, one can assume that the material formed from mantle material which was following the same path of evolution of these ratios as chondrites , and then again the time of formation can be calculated see The CHUR model.

The name pyrochlore which was first introduced by J.J. Berzelius for a cubic mineral found by N.O. Tank in the s in a syenite pegmatite at Stavern (formerly Fredriksvärn), Norway (Wöhler ).

This is an open access article distributed under the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract An analytical protocol for high-precision, in situ microscale isotopic investigations is presented here, which combines the use of a high-performing mechanical microsampling device and high-precision TIMS measurements on micro-Sr samples, allowing for excellent results both in accuracy and precision.

The present paper is a detailed methodological description of the whole analytical procedure from sampling to elemental purification and Sr-isotope measurements. The method offers the potential to attain isotope data at the microscale on a wide range of solid materials with the use of minimally invasive sampling. The studied cases show the robustness of the methods, which can be also be applied in other areas, such as cultural heritage, archaeology, petrology, and forensic sciences.

Introduction In situ radiogenic isotope determinations with microscale resolution, especially of Sr, can represent a powerful tool in different fields of geological and life sciences. In particular, this technique is nowadays one of the most important methods for the investigation and interpretation of magmatic processes, as well as of environmentally-induced responses of terrestrial mammals; it has the potential to greatly enhance our understanding of not only volcanic systems and the related magma genesis and evolution, but also of the physiological mechanisms behind specific organic adaptations.

Samarium–neodymium dating

Godthelp in Hill, Robert S. White, , The Nature of Hidden Worlds: Australian Conservation Foundation, Melbourne. Michael Archer, Suzanne J. Gehling, Kathleen Grey, Guy M. Franklin, The revolution that didn’t arrive:

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Geological setting of the study; Mineral composition of the dykes; Discussion of findings. The Sr, Ba, and rare earth elements REEs concentrations and Sr isotopic composition of anhydrite and gypsum have been determined for samples from the Matsumine, Shakanai, and Hanaoka Kuroko-type massive sulfide? Antarctic continental weathering changes during Eocene-Oligocene cryosphere expansion Robert, Christian; Kennett, James P. Effects of weathering on the structures of the area; Indications of chemical weathering in the area; Variations in the clay minerals in the area.

Origin of iron-oxide and silicate melt rocks in Paleogene sediments of southern Ellesmere Island, Canadian Arctic Archipelago, Nunavut. The basin deposits are Paleocene to Eocene in age and overlie unconformably folded Ordovician and Silurian carbonates of the It refers to a metallic element found in various compounds of certain minerals, seawater and marine plants. Strontium 90 is a radioactive variety that is produced during nuclear reactions and may be found in nuclear fallout.

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University of Tasmania, Australia

Cenozoic volcanic rocks show two clusters of compositions compilation in Lucassen et al. The regional distribution of the clusters indicates Pb provinciality Mamani et al. The unradiogenic Midproterozoic Arequipa source is already an endmember in the compositional array of the Early Palaeozoic basement rocks.

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The Canary Islands developed in a geodynamic setting characterized by Jurassic oceanic lithosphere formed during the first stage of opening of the Atlantic at Ma and lying close to a passive continental margin on a very slow-moving tectonic plate — the African plate. In addition, the archipelago lies adjacent to a region of intense active deformation comprising the Atlas mountains, a part of the Alpine orogenic belt.

Geographic and geodynamic setting of the NW African continental margin with the Canary Islands and other archipelagos from Carracedo et al. Seismic refraction data and magnetic anomalies suggest that all the islands lie on oceanic crust and their limit is located between Lanzarote-Fuerteventura Figure 3 and the coast of Africa Roest et al. The continent-ocean boundary is characterized by the presence of a km-thick layer of sediments. The seismic sections show a number of discontinuities, interpretated as basement fractures, and some of them are seismically active.

Magmatism in the Canary Islands started during the Cretaceous and subaerial volcanism during the Miocene Figure 3. The oldest stages have been difficult to reconstruct due to problems inherent in isotopic dating. Thus, Cantagrel et al. In contrast with those authors, Le Bas et al.

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