نتایج جستجو برای: magmatic association

تعداد نتایج: 509311  

Journal: :The Journal of Geology 1893

Journal: :Annual Review of Earth and Planetary Sciences 2021

Understanding the evolution and processes that shape our planet critically depends on robustness of absolute ages process durations obtained from rocks crystals. Two main aspects time information magmatic systems are currently at forefront new knowledge. The capacity to determine human timescales makes it possible relate magma dynamics below active volcanoes with monitoring signals measured sur...

2013
C. T. Nguyen H. M. Gonnermann Y. Chen C. Huber A. A. Maiorano A. Gouldstone J. Dufek

[1] We present the results of new laboratory experiments that provide constraints on inter bubble film thinning and bubble coalescence as a consequence of liquid expulsion by gravitational and capillary forces. To ensure dynamic similarity to magmatic systems, the experiments are at small Reynolds numbers Re 1 ð Þ and cover a wide range of Bond numbers (10 3 Bo 10). Results indicate that at Bo<...

Journal: :Science 2016
D C Lund P D Asimow K A Farley T O Rooney E Seeley E W Jackson Z M Durham

Mid-ocean ridge magmatism is driven by seafloor spreading and decompression melting of the upper mantle. Melt production is apparently modulated by glacial-interglacial changes in sea level, raising the possibility that magmatic flux acts as a negative feedback on ice-sheet size. The timing of melt variability is poorly constrained, however, precluding a clear link between ridge magmatism and P...

2015
Lucia Profeta Mihai N. Ducea James B. Chapman Scott R. Paterson Susana Marisol Henriquez Gonzales Moritz Kirsch Lucian Petrescu Peter G. DeCelles

We present global and regional correlations between whole-rock values of Sr/Y and La/Yb and crustal thickness for intermediate rocks from modern subduction-related magmatic arcs formed around the Pacific. These correlations bolster earlier ideas that various geochemical parameters can be used to track changes of crustal thickness through time in ancient subduction systems. Inferred crustal thic...

2008
M. M. Hirschmann M. S. Ghiorso

[1] We describe the Library of Experimental Phase Relations (LEPR), which is a new Web-based database of experiments pertaining to magmatic phase equilibria. The database includes information from experiments related to natural or near-natural magmatic silicate phase equilibria. At present, the database includes more than 6,600 experiments with liquids ranging in composition from komatiite to r...

2002
Robert Cann

Significant magnetite, in the form of dyke-like lodes (Cockfield. 1948). occurs in close spatial relationship to copper deposits such as the Afton mine. The genetic relationship of these massive magnetite lodes to the copper deposits of the Iron Mask is unknown, as i s the origin of the magnetite deposits. However, the proximity of these deposits to magnetite-rich intrusive units of the Iron Ma...

اشرفی, ناصر, اِبی, نلسون, جهانگیری, احمد, عامری, علی, هَسِب, نوریکو ,

Mineral chemistry of micas from the subduction-related mafic and felsic alkaline rocks of the Kaleybar alkali-gabbro and the Bozqush nepheline syenite was determined. The micas generally occur as large poikilitic grains with Fe-Ti oxides and mafic minerals and give the rocks a spotted texture. Micas in the alkali-gabbro sometimes display a distinct lamination. Based on the International Mineral...

تقی‌پور, بتول, تقی‌پور, صدیقه, رهگشای, محمد, مکی‌زاده, محمدعلی ,

The Zaroo Cu-skarn is located NW of Yazd province, within the Cenozoic magmatic belt of Central Iran. The widespread rocks in the region are Eocene age volcanic with granitoids intrusives. The Cretaceous limestones in western parts of West Zaroo are hosted by skarn – marble mineralization. The skarns are distal type and are characterized by assemblage: Clinopyroxene, garnet, ilvaite, vezovianit...

Journal: :Nature communications 2013
Wei Chen Vadim S Kamenetsky Antonio Simonetti

The Earth's sole active carbonatite volcano, Oldoinyo Lengai (Tanzania), is presently erupting unique natrocarbonatite lavas that are characterized by Na- and K-bearing magmatic carbonates of nyerereite [Na2Ca(CO3)2] and gregoryite [(Na2,K2,Ca)CO3]. Contrarily, the vast majority of older, plutonic carbonatite occurrences worldwide are dominated by Ca-(calcite) or Mg-(dolomite)-rich magmatic car...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید