Clinopyroxene/Melt Trace Element Partitioning in Sodic . 09/11/2019 Experiments on the synthetic compositions produced clinopyroxene of diopside to aegirine–augite composition (Di 29–82, Aeg 9–45 Hd 7–33), a subset of which overlap with the compositional space defined by the Canary Islands clinopyroxene on a diopside–hedenbergite–aegirine ternary diagram (Fig. 4a, Table 3 and .
but also by means of numerical modelling. Based on a model of Brice (1975) , Blundy et al. (1995)  developed a quantitative model and determined a parametrised ﬁt function for clinopyroxene/melt partition coefﬁcients for sodium in the range of 0-4 GPa and 1000-1800 C. As is shown in Figure 1, partition coefﬁcients of trace
Clinopyroxene is an excellent mineral for investigating the mechanisms of rapid crystal growth, because the degree of undercooling has a considerable effect on clinopyroxene composition and texture (e.g., Pontesilli et al., 2019; Masotta et al., 2020), particularly in mafic alkaline magmas (e.g., Hollister and Gancarz, 1971; Downes, 1974; Leung, 1974; Shimizu, 1981).
· Abstract. Experiments at high pressure and temperature indicate that excess Ca may be dissolved in diopside. If the (Ca, Mg) 2 Si 2 O 6 clinopyroxene solution extends to more Ca-rich compositions than CaMgSi 2 O 6, macroscopic regular solution models cannot strictly be applied to this system.A nonconvergent site-disorder model, such as that proposed by Thompson (1969, 1970), may …
The crystal chemical response of basalt clinopyroxene to increasing pressure was investigated by means of crystal-structure simulation (a procedure that enables modeling of the structural parameters of a clinopyroxene of known chemistry without requiring direct X-ray diffraction analysis) using available experimental chemical data. Pressure proved the main physical variable governing .
The intragrain variations shown in REE patterns for pyroxene in each sample are fairly uniform and within analytical uncertainty (Appendix 6). Pyroxene grains show varying degrees of LREE depletion over HREE (Fig. 2a) except for three samples (TM06, 19, 60).TM06 is the most anomalous having depleted REE contents and a spoon-shaped pattern (Fig. 2a) whilst TM19 and TM60 show elevated La or Ce .
The kimberlite has been radiometrically dated at 1179 ± 36 Ma using Rb–Sr in clinopyroxene and 1202 ± 72 Ma using U–Pb in perovskite. The pipe is itself intruded by a gabbro sill of 1150 Ma. . Crusher / Mill Type Model Size Power Quantity; Jaw crusher: 1: . which is known to impact large stone recoveries as while diamond is the .
Type Jaw crusher Model C150 Capacity 700 Tph Operating speed 220 rpm Nominal power 200 KW (300HP) Feed opening (1400 x 1200) mm Max Rec Feed Size 960 mm (38 inch) CSS (125 - 250) mm Stroke 41 mm Sumber : Manual book metso Nordberg C15 Tabel 2. Spesifikasi Cone Sekunder Sandvik CS440 Type Cone crusher Model CS440
· The values of the parameters as obtained from the model simulation results are: α 1 = 0.3, α 2 = 1.3 for all materials and openings of the jaw crusher tested, while the parameter K was variable and depending on the opening of the crusher. The model fits the experimental data for all tested materials at CSS of 15 mm (Fig. 5).
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If the older Lal (1991)/Stone (2000) model is used to scale production rates, calculated ages are older by 16e25%. Helium-3 and chlorine-36 exposure ages measured on the same samples show .
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The assessment of particulate matter emitted from stone-crushing industry by correlating rock textures with particles generated after comminution and dispersed in air environment. Environmental Science and Pollution Research, 2013. Gianluca Vignaroli. Girolamo Belardi. Gianluca Vignaroli.
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