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Figure 1

From: Characterisation, Sources and Flux of Unmelted Micrometeorites on Earth During the Last ~50,000 Years

Figure 1

(a) AAS38-165 M-4 P-4. Typical scoriaceous (fgMM) particle. (b) AAS38-147 M-19 P-3. Highly fluffy scoriaceous particle with high volatile element contents. (c) AAS38-139 M-9 P3. Dusty olivine chondrule comprising entirely of reversely zoned olivine crystals. (d) AAS38-155 M-6 P-7. Composite particle (CM chondrite fragment) i.e., meteorite matrix with two small chondrules (marked ch). The top chondrule is olivine (Type IIA)and the bottom one (Type IIB) comprises of Mg-rich pyroxene. (e) AAS38-147 M-26 P-3. Composite particle (CM chondrite fragment) with two partial chondrules. The top semicircular portion contains olivine; the bottom larger chondrule is a POP chondrule with olivine surrounding Mg-rich pyroxene. (f) AAS38-155 M-7 P-2. cgMM a POP chondrule (Type IAB; CV chondritic) fragment comprising of olivine (ol) and pyroxene (px). (g) AAS38-165 M-2 P-4. Glassy, matrix that comprises of olivine normative composition with interstitial feldspar. Inset shows a small spherule development at the edge of the particle due to heating during entry. (h) AAS38-147 M-17 P-3. Individual mineral grain, Mg-rich enstatite with an oxidized rim. (i) AAS38-165 M-4P-2. Refractory inclusion of melilite/fassaite composition in a glassy matrix. (j) AAS38-139 M-15 P-1. Taenite crystal showing high levels of aqueous alteration that took place during its residence on the seafloor. (k) AAS38-147 M-18 P-5. Metal-rich chondriic particle. Closely-spaced and numerous blobs of kamacite composition. Inset a magnfied version of kamacite blobs. (l) AAS38-165 M-4 P-1. Native nickel with a prominent rim. The particle comprises of ~99% Ni. The rim contains very low levels of S and Fe (<1%).

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