Modeling Campo del Cielo strewn field

Artemieva, N. A.; Schmalen, Andrea; Luther, R.

doi:10.5194/epsc2021-106

Cited by 2 publications

(3 citation statements)

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“…South China is an important geographic branch of AASF (Figure 1b), because this area is the northern portion of this strewn field (Yan et al, 2022), and it corresponds to the uprange of the hypothesized impactor trajectory. Numerical simulations suggested that impact plume formed by an oblique impact would be inclined toward the downrange, so that much fewer impact melt that was engulfed in the impact plume was capable to form tektites at the uprange (Artemieva, 2013;Stöffler et al, 2002). Therefore, compared to most other Cenozoic tektites, AASF tektites at South China are unique in terms of locations, since they are located at the uprange and close to the hypothesized source crater (Ma et al, 2004;Whymark, 2021).…”

Section: Aasf Tektites At South Chinamentioning

confidence: 99%

“…AASF was formed at 788.1 ± 3 ka ago (Jourdan et al., 2019), and its highly‐asymmetry geographic boundary (Figure 1a) indicates an oblique impact from north–northwest to south–southeast (Artemieva, 2008b). AASF may contain about 10 8 tons of tektites and microtektites (Glass, 1990), and the source impactor may be about 1 km in diameter (Artemieva, 2013; Goderis et al., 2017). The parent crater of AASF has an estimated diameter of over 30 km and depth of over several kilometers (Glass & Koeberl, 2006; Glass & Pizzuto, 1994; Prasad et al., 2007).…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Properties of Australasian Tektites From South China

Pan

Shi

et al. 2023

JGR Solid Earth

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South China, the northern part of the Australasian strewn field (AASF) of tektites and microtektites is located at the uprange of the hypothesized source crater that is still unconfirmed. Magnetic properties of impact glasses are an important indicator of their source materials and thermal history. Extensive magnetic investigations have been performed on various AASF tektites sampled from both the Indochina Peninsula and further south, but such information remains sparse for those sampled from South China. Here, we present a detailed rock magnetism study for both Muong Nong‐type and splash‐form AASF tektites from South China, showing that all the tektites have rather weak remanent magnetization, but ferromagnetic information can be extracted from their dominating paramagnetic signal. Signals caused by superparamagnetic particles are elusive, but those of single domain magnetite are detected in the splash‐form tektites, and signals of pseudo‐single domain magnetite are discovered in the Muong Nong‐type tektites. Each morphological type of tektites from a same geographic area exhibits large dispersions in their magnetic properties. Across the entire AASF, the Muong Nong‐type tektites from South China exhibit the lowest average magnetic susceptibility, and the splash‐form tektites exhibit the smallest average natural remanent magnetization and ratio of equivalent magnetization. The observed heterogeneous magnetic properties are mainly caused by the different contents and sizes of magnetic particles, which can be explained by the different shock level and/or cooling history of the tektite melts. Micro‐sized immiscible Fe‐S spherules in the Muong Nong‐type tektites from South China were likely originated from the pre‐impact target.

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Section: Aasf Tektites At South Chinamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetic Properties of Australasian Tektites From South China

Pan

Shi

et al. 2023

JGR Solid Earth

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“…In the entire strewn field, Muong Nong‐type tektites from South China exhibit the lowest average MS, and splash‐form tektites from South China exhibit the smallest average NRM and REM values, which are comparable with those of ablated splash‐form tektites from Australia (Pan et al., 2023a). Therefore, AASF tektites from South China may record different formation conditions compared to the rest of the strewn field, and their precursor impact melt might have experienced unique thermal history during cooling (Artemieva, 2013; Pan et al., 2023a).…”

Section: Introductionmentioning

confidence: 99%

Magnetite in Muong Nong‐Type Australasian Tektites From South China

Pan,

Xiao,

et al. 2023

Geochem Geophys Geosyst

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South China belongs to the northern geographic branch of the Australasian strewn field (AASF) of tektites and microtektites, and this area is assumed to be part of the uprange region of the putative impactor trajectory that formed the yet undiscovered source crater. Ferromagnetic minerals in impact glass may record the magnetization process and thermal history of impact melt, but the possible identity of ferromagnetic minerals in AASF tektites from South China is elusive. Here, we perform a rock magnetism and crystallography study of iron‐sulfur spherules in Muong Nong‐type tektites from South China, revealing abundant single‐domain and pseudo single‐domain nano‐grains of magnetite within the spherules. This result is consistent with the detection of magnetic signals caused by single‐domain and pseudo single‐domain magnetite in these samples. Compared to the large value ranges of magnetic properties of tektites in the entire strewn field, individual specimens of both Muong Nong‐type and single splash‐form tektites have relatively homogeneous magnetic properties in terms of magnetic susceptibility, natural remanent magnetization (NRM), saturation isothermal remanent magnetization (SIRM) and NRM/SIRM ratio. The results indicate that the impact melt that formed each tektite specimen experienced similar thermal history, and most AASF tektites from South China were cooled in an ambient magnetic field that is the same order of magnitude as the Earth's magnetic field.

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Modeling Campo del Cielo strewn field

Cited by 2 publications

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Magnetic Properties of Australasian Tektites From South China

Magnetic Properties of Australasian Tektites From South China

Magnetite in Muong Nong‐Type Australasian Tektites From South China

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