Here we report data on recently discovered volcanic meteorite Northwest Africa (NWA) 11119, which represents the first, silica dating oldest, silica-rich (andesitic to dacitic) porphyritic extrusive crustal rock with an Al–Mg age of 4564.
This Fe/Mn ratio suggests formation in a reduced environment with a low oxygen fugacity below the iron-wüstite (IW) buffer and above the Mn–MnO buffer, similar to the reduced silicate mineralogy in winonaites 9.
Comparison of CI-normalized Silicaa abundances in whole rocks of NWA 11119 (black inverted daging, ALM-A (orange), NWA 7325 (gray), and average continental andesite (green). A laser-based microanalytical method for the in situ determination of oxygen isotope ratios of silicates and oxides. One view of the geochemistry of subduction-related magmatic arcs, with silica dating emphasis on primitive andesite and lower crust.
Partial melting of the Indarch (EH4) meteorite: a textural, chemical, and phase silica dating view of melting and melt migration. Early formation of evolved asteroidal crust. NWA 11119, owing to the highly reduced nature of the enstatite chondrite parent body. Relative to silica dating D’Orbigny age anchor, NWA 11119 has a 26Al– 26Mg age of 4564.
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SD external reproducibility) was ±6 ppm 52. The Plag A, B, and C separates show relatively flat REE patterns (CI-normalized La/Yb = 0. Chemical compositions of the phenocrysts (Table 1) exhibit moderate–minor variations and are represented by the following: clinopyroxene (augite Fs 6. X-ray diffraction (XRD) techniques were conducted on a Rigaku Smartlab X-ray diffractometer at UNM to determine the composition of the silica polymorph in NWA 11119.
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This method was used to identify minerals and obtain images and X-ray maps of the section. A ~500 mg fragment was removed from the deposit sample for trace element and Al–Mg dating studies at Arizona State University (ASU). After careful crushing, sieving, and density separation, one pyroxene separate (Px A), three plagioclase-rich separates (Plag A, B, and C), and one silica-rich separate (SiO 2) were handpicked.
High precision 26Al- 26Mg Systematics of A New Eucrite Northwest Africa 10919 and the Brachinites Northwest Africa 4882 and Brachina. New constraints on early solar system chronology from Al-Mg and U-Pb isotope systematics in the unique basaltic achondrite Northwest Africa 2976.
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NWA 11119 provides the first unambiguous evidence for evolved volcanism in the earliest stages of Solar System history, prior to the assembly of the terrestrial planets. Mineral modal abundances were calculated by pixel counting using the image processing program ImageJ 49. Figure 3a shows the bulk rock content of NWA 11119 compared to the isotopically similar NWA 7325 39 and ALM-A 3 samples, and the trachyandesitic GRA 06128/9 1 samples.
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Plate tectonics and mantle volatile contents are also thought to play significant roles in the production of andesitic crusts 4, 41. Cu filter was placed in front of the output window of the X-ray source during the scan. A low O/Si ratio on the surface of mercury: evidence for silicon smelting? The bulk composition of NWA 11119, along with its early formation age as indicated by its 26Al– 26Mg internal isochron, demonstrates unambiguously that andesitic–dacitic volcanism occurred on a differentiated parent body within the first 2.
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Partial melting studies of chondritic materials between IW-1 and IW-5 are lacking, but future studies aimed at this range in fO 2 may provide important constraints into the origin of NWA 11119, the origin of other evolved and reduced asteroidal samples, and the origin of reduced planetary bodies such as Mercury 48. A petrologic, thermodynamic and experimental study of brachinites: partial melt residues of an R chondrite-like precursor.
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These nuclides are particularly useful to geologists because they are produced when cosmic rays strike oxygen-16 and silicon-28, respectively. A ~200 mg fragment was removed from the deposit sample for X-ray diffraction studies at UNM. Supplementary Data 1), and silica (~97. The Al–Mg internal isochron defined by whole rock (WR) and mineral separates of NWA 11119.
Composition of the continental crust. This Article was originally published without the accompanying Peer Review File. The consistency in silicate weathering rates suggests that DSi could be a robust and cheap proxy silica dating mean residence times for recent groundwater (5–100 years) at the regional scale.
Standards and elements were used as followed: silica dating for Si, Ca, rutile for Ti, apatite-wilberforce for P, rhodonite for Mn, orthoclase for K, hook up keyboard to garageband for Na, Sitkin anorthite for Ca, Si, and Al, San Carlos olivine for Mg, Springwater olivine for Si and Fe, chromite for Cr, Rockport fayalite for Fe, slica Ni metal for Ni.
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