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X-ray powder diffractogram of the silicate melt rock shown in Fig. 4. Beside the sharp diffraction peaks belonging to the feldspar phase ( f ), strongly broadened mica peaks ( m ) can be observed. The broadening reflects the low crystallinity of this phase. A typical glass “hump” is visible in the 2 -range between 20° and 30°, with peaks of feldspar and mica phases superimposed. (Measurement was carried out using a Philips PW1710 diffractometer with secondary monochromator. Operating conditions for the x-ray tube: 40 kV accelerating voltage, 30 mA beam current on a copper anode. Measuring conditions: range 4 ≤ 2 θ ≤ 100 ° ; stepwidth ∆ 2 θ = 0.02 ° ; time/step 2 s. Phase analysis was carried out using MDI-JADE+ program and ICDD database). 

X-ray powder diffractogram of the silicate melt rock shown in Fig. 4. Beside the sharp diffraction peaks belonging to the feldspar phase ( f ), strongly broadened mica peaks ( m ) can be observed. The broadening reflects the low crystallinity of this phase. A typical glass “hump” is visible in the 2 -range between 20° and 30°, with peaks of feldspar and mica phases superimposed. (Measurement was carried out using a Philips PW1710 diffractometer with secondary monochromator. Operating conditions for the x-ray tube: 40 kV accelerating voltage, 30 mA beam current on a copper anode. Measuring conditions: range 4 ≤ 2 θ ≤ 100 ° ; stepwidth ∆ 2 θ = 0.02 ° ; time/step 2 s. Phase analysis was carried out using MDI-JADE+ program and ICDD database). 

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The Rubielos de la Cérida impact structure forms a companion crater to the Late Eocene-Oligo-cene Azuara impact structure. Both are located more or less at the margin of the Iberian chains and the Ebro basin south of Zaragoza. Within the Rubielos structure, silicate melt rocks, carbonate-phosphate melts with small-scaled immiscibility features, ver...

Contexts in source publication

Context 1
... around 0.5 mm, sometimes smaller (Fig. 4b). A second, subordinate glass phase is translucent greyish and oc- curs interstitial within the white glass particles (dark parts in Fig. 4b). The glass is estimated to make up more than 90 % of the rock. This is typically shown by a distinct amorphous glass "hump" occurring in x-ray powder diffractograms (Fig. 5). Some relics of plagioclase and, in a minor amount, of quartz and mica within the glass masses are indicated by respective reflection peaks. Grains of quartz, twinned plagiocase, and few mica were also found in the thin sections to be dis- tributed within the glass matrix. In rare cases, the quartz fragments show planar deformation ...
Context 2
... In comparison to the silicate melt rock, a less pronounced glass "hump" can be ob- served due to the superimposed strong and sharp quartz and calcite peaks. The "hump" becomes clearly visible in the enlarged part of the diffractogram with a logarithm scale of the intensity. (Operating and measurement conditions similat to that described for Fig. 5 except for the time/step with 10 ...
Context 3
... clearly broadened peaks of hydroxylapatite (h) are superimposed to a glass "hump". The "hump" be- comes visible in the enlarged part of the diffractogram with a logarithm scale of the intensity, but is less dis- tinct due to a subordinate content of phosphate glass in the melt. (Operating and measurement conditions similat to that described for Fig. 5 except for the time/step with 10 s). Table 2. Electron microprobe analyses of the glassy phosphate matrix (dark areas in Fig. 8), mean composi- tion of this matrix, and x-ray fluorescence measured bulk composition of the carbonate-phosphate ...

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... : Azuara impact structure located south of Zaragoza and north of the compagnion Rubielos de la Cérida impact structure [5,6,7] As shown by thin sections under the microscope, the vein consists of a light matrix of carbonate minerals, hosting a high amount of black spherical to amoeboidal particles which show gel-like layered structure in the reflective light. The rim towards the dolomite country rock is characterized by pure carbonate crystals having grown perpendicular to the vein´s wall. ...
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