Peatlands are important carbon sinks, therefore their degradation mainly due to lowering of the water table, has an adverse effect cycle and largely burden atmosphere. Annually, extensive areas these peatlands affected by wildfires, large peatland have been degraded, directly or indirectly related anthropogenic activities, contributing greenhouse gas emissions. Some most pristine tropical worldwide occur primarily at coastal lowlands Southeast Asia. In terms geological features evolution,...

Abstract The Miocene igneous rocks in the Basal Unit of Lavrion area form part granitoid province central Aegean. Undeformed, subvertical dykes quartz-syenite to granodiorite and granite porphyries, a little deformed but variably altered stock intrude metamorphic Unit. A 9.4 ± 0.3 Ma K–Ar age on feldspar for dyke rock provides minimum activity East–west orientation porphyry is indicative regional extensional stress field with roughly north–south direction. Substantial extension after...

This study aims at the interpretation of adverse effects secondary products in two types rocks during their performance as concrete aggregates. Serpentinised peridotites contain serpentine, dominant phase, which creates low microroughness on particles and therefore unfavorable surfaces for cement paste to adequately adhere to. Moreover, its soft platy nature contributes development defects along contacts aggregate with paste. Poor adherence paste, failures potential propagation into curing...

Abstract Recurring discoveries of abiotic methane in gas seeps and springs ophiolites peridotite massifs worldwide raised the question where, which rocks, was generated. Answers will impact theories on life origin related to serpentinization ultramafic rocky planets. Here we document, through molecular isotopic analyses liberated by rock crushing, that among several mafic rocks composing classic Greece, i.e., serpentinite, peridotite, chromitite, gabbro, rodingite basalt, only chromitites,...

Abstract The Cenozoic Sulu Sea arc‐basin system is situated in the tectonic junction between South China (SCS), northern Borneo, Palawan Continental Terrane, Philippine Mobile Belt, and Celebes Sea. We compare new/published geochronological geochemical data from across circum‐Sulu region, summarize seven major magmatic phases Middle Eocene to Pleistocene. (42.65 Ma) Sabah ophiolite Eocene‐Oligocene (34‐33 Central have MORB‐IAT‐transitional features, representing an intraoceanic subduction...

This paper examines the effect of aggregate type on concrete strength, and more specifically, how petrographic characteristics various rocks as well their physico-mechanical properties influences durability C 25/30 strength class concrete. The studied were derived from Veria-Naousa Edessa ophiolitic complexes granodiorite albitite surrounding areas in central Macedonia (Greece). Concretes produced with constant volume proportions, workability, mixing curing conditions using different sizes...

This paper examined three different types of recycled materials, such as beer green glass, waste tile, and asphalt, which will be used in mixtures order to prepare concrete specimens and, more specifically, their effect on strength how the petrographic characteristics various materials influenced durability C25/30 class concrete. Particular emphasis was placed artificial microroughness glassy smooth surfaces final strength. The values do not show great variance, but limited differences have...

Abstract New zircon U-Pb geochronology from a peridotite suite near Ranau and the Telupid ophiolite in Sabah, eastern Malaysia, contradict previous studies, which assumed that Sabah mafic-ultramafic rocks are largely ophiolitic Jurassic–Cretaceous age. We show these formed during magmatic episode Miocene (9.2–10.5 Ma), is interpreted to reflect infiltration of melts melt-rock reaction subcontinental peridotites extension, concurrent seafloor spreading forming further south. Older zircons...

Whole-rock geochemical and Sm/Nd isotope data are presented for a representative suite of crustal rocks from the Pindos Ophiolite in order to resolve origin signature boninites. Comparison is made with Triassic MORB Avdella mélange other ophiolitic northwestern Greece. Hydrothermal alteration results large scatter Sr K some variability Ba, Th U. The boninites contain high Zr Hf respect REE, characteristic many Pb, La/Sm Nb decrease decreasing TiO2 IAT, but then increase Nd isotopic values...

The chromitites of the Milia area in Pindos ophiolite complex, Greece, were investigated for their platinum-group mineral (PGM) content. are massive, more rarely disseminated texture and occur as small pods. They composed magnesiochromite crystals with Cr# [Cr/(Cr + Al)] between 0.80 0.84, Mg# [Mg/(Mg Fe 2+ )] 0.54 0.72. total platinum-group-element (PGE) contents relatively low (≤170 ppb), although they may locally be higher (up to 1059 ppb). IPGE (Os, Ir Ru) predominate over PPGE (Rh, Pt...

Radioactivity levels of naturally occurring radionuclides at the coast Brunei Darussalam were evaluated along with their dose rates. Twenty-six berm and intertidal sediment samples measured using gamma-ray spectrometry. The mean activity concentrations 226Ra, 232Th 40K in sediments 10.07 ± 1.02 Bq/kg, below minimum detectable activity, 21.44 1.23 respectively, whereas for they 7.01 0.87, 1.67 0.15 4.99 0.42 respectively. With respect to radiological health risk, average hazard indices,...

The Edessa ophiolite complex of northern Greece consists remnants oceanic lithosphere emplaced during the Upper Jurassic-Lower Cretaceous onto Palaeozoic-Mesozoic continental margin Eurasia. This study presents new data on mineral compositions mantle peridotites from this ophiolite, especially serpentinised harzburgite and minor lherzolite. Lherzolite formed by low to moderate degrees partial melting subsequent melt-rock reaction in an spreading setting. On other hand, refractory high a...

The Veria-Naousa ophiolite represents a dismembered unit in north Greece, which includes variably serpentinised lherzolite and harzburgite, locally intruded by sparse network of dykes or thin layers websterite olivine-orthopyroxenite composition. the show abundant petrographic geochemical evidence (relic olivines with mantle affinities, Cr-rich spinels, low Al2O3, depletions incompatible elements, concave upwards rare earth element patterns) that they comprise replacive bodies from...

This paper examines the effect of aggregate type on concrete strength and more specifically how petrographic characteristics various rocks as well their physico-mechanical properties influences durability C 25/30 class concrete. The studied are derived from Veria-Naousa Edessa ophiolitic complexes granodiorite albitite surrounding areas in central Macedonia (Greece). Concretes produced with constant volume proportions, workability, mixing curing conditions using different sizes each type....