Abstract New geochemical data, including Sr–Nd–Pb isotopes for whole-rock and groundmass samples, are reported edifice-forming eruptives at Tongariro volcano, Zealand, which span its ~ 350 ka to late Holocene history. medium-K basaltic-andesites dacites (53.0–66.2 wt% SiO 2 ) that evolved via assimilation-fractional crystallisation (AFC) processes partly or mostly in the uppermost 15 km of crus...

ةــصلاـخلا : سا وه ةنيجهلا ملعتلا ةمظنأ يدحت نإ تامولعملا رداصم دحأ نم ةعبانلا تامولعملا لامعت رخآ ردصم نع ةمجانلا صئاقنلا ةنزاومل . كلذ و ةدعاو ثحب ةهجو لثمي يزمرلا يكبشلا جزملا نإ ةيزمرلا نيتقيرطلا نيب دضاعتلا نلأ ) ةيرظنلا ( ةيكبشلا و ) ةيبيرجتلا ( لآ لامعتسا نم ةيلاعف رثآأ ادح ىلع امهنم ةدحاو . لا اذه فصي ،يزمر يكبش فنصم ةطساوب ةيفرحلا ةيبرعلا غلابملا ىلع فرعتلل اماظن ثحب ،ةيلاملا غلابملا...

ناآ دقل رهوج ،ةيفخ ةفصب تامولعملا لاسرإ و لاصتلاا عوضوم مدقلا ذنم مامتهلاا و ديعب نمز ذنم عساو لكشب مدختست ةيصنلا قئاثولا تناآ ، صوصنلا يف تامولعملا ءافخلإ ةفلتخم اًقرط مويلا ىتح نمز ذنم دهشن نحن كلذل ) Text Steganography .( لاقملا اذه نإ ط لوانتي ةيبرعلا و ةيسرافلا صوصنلا يف تامولعملا ءافخلإ ةديدج ةقير . و دوآ ينويلا ةفصاوم يف دجوي ) Unicode ( ءايلا فرحل نافلتخم نازمر » ى « ، فاكلا فرحل كلذآو...

Recent (<5 Ma) Hawaiian volcanoes define two sub-parallel spatial trends, Loa and Kea. Despite the short distance ( 30 km) between adjacent volcanoes on these trends, most of the Loa-trend shield lavas are geochemically distinct from most of the Kea-trend shield lavas. These geochemical differences arise from small amounts of the LOA component in the source of Loa-trend shield lavas. This compo...

Neodymium strontium manganese oxide with ideal composition Nd(0.5)Sr(0.5)MnO(3) was reported to have two different structure models. In one model, the x coordinate of an O atom is at x > 1/2, while in the other model the x-coordinate of this atom is at x < 1/2. Difference-density maps around this O atom obtained from the current redetermination clearly show that the structure with the O atom at...

Recently, some diffusion-based filtering methods have been developed such as anisotropic diffusion (AD) or nonlinear diffusion (ND), which can reduce the speckle noise, at the same time, preserve and enhance the edge/borders in ultrasound image. However, because of the granular pattern of speckle, it is quite difficult to reduce speckle exactly through diffusion-based methods only. In this pape...

Abstract The identification of an eroded fore-arc crust component in arc magmas is challenging due to the combined effects mantle metasomatism and crustal assimilation–fractional crystallization. In this study, molybdenum (Mo) isotope compositions are used conjunction with Sr-Nd-Hf isotopic elemental data identify components adakites from Cuyapo Balungao volcanoes northern Bataan segment Luzon ...

هديكچ ط ي لاس اه ي خا ي ر پ ي تفرش لباق هظحلام ا ي رد طابترا اب لولس ه ا ي نب ي دا ي لصاح هدش تسا هک ون ي د شخب هار اهراک ي ون ي ن نامرد ي رد ب ي رام ي اه ي بعص جلاعلا م ي .دشاب ا ي ن لولس اه هک رد مامت ناگرا ي مس اه ي دنچ لولس ي روضح ،دنراد اناوت يي سقت ي م و دبت ي ل هب لولس اه يي سب ي را صاصتخا ي ار هتشاد و نچمه ي ن رداق هب اج ي زگ ي ن ...

Rationale Complete decomposition of silicate rock matrices is crucial in determining their isotopic compositions, but acid dissolution a high-pressure steel-jacketed bomb, which has been the only powerful, effective technique thus far, time-consuming and expensive. Rock using ammonium bifluoride (ABF), as described here, viable alternative. Methods Geological reference materials (GRMs) were dig...

Abstract The Pyroxenite Marker, a thin, orthopyroxene-dominated marker horizon, is observed towards the top of Main Zone Bushveld Complex, where last voluminous influx magma into Complex thought to have occurred. In an attempt constrain Nd-isotopic composition added at level total 21 whole-rock samples from borehole (BH7771) drilled on Central Sector Eastern Limb were analysed for their Sr–Nd i...