Tektites That Were Partially Plastic after Completion of Surface Sculpturing

Nininger, H. H.; Huss, Glenn I.

doi:10.1126/science.157.3784.61

Cited by 14 publications

(6 citation statements)

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“…Some of these may be deformed in ways showing they had not solidified before impact (Fig. 3); plastically deformed dumb-bells and discs were also reported by Nininger and Huss (1967). Flow lines on a disc (Fig.…”

Section: Empirical Modelmentioning

confidence: 77%

An empirical model for the Australasian tektite field

Ford

1988

Australian Journal of Earth Sciences

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Section: Empirical Modelmentioning

confidence: 77%

An empirical model for the Australasian tektite field

Ford

1988

Australian Journal of Earth Sciences

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“…Recent field studies for fragments of Muong Nong‐type tektites at Thailand suggested in situ intensive fragmentation upon landing, indicating that the Muong Nong‐type tektites had a brittle mechanical behavior when landed (Tada et al., 2020). It was also observed that splash‐form tektites at Vietnam had a brittle skin and plastic interior when landed (Nininger & Huss, 1967). The liquid to solid transition temperature of tektite melt is about 780°C (Wilding et al., 1996).…”

Section: Discussionmentioning

confidence: 99%

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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“…In contrast to Darwin glass, many tektites in the Australasian field still landed or encountered a dense atmosphere when molten enough to be warped in shape (Nininger and Huss 1967). This highlights a well-known difference in the formation of impact glasses and splashform tektites stricto senso.…”

Section: Melt Ejection Velocity Flight and Cooling Timesmentioning

confidence: 96%

Physical distribution trends in Darwin glass

Howard

2009

Meteorit & Planetary Scien

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Abstract— Darwin glass formed by impact melting, probably during excavation of the 1.2 km diameter Darwin crater, Tasmania, Australia. The glass was ejected up to 20 km from the source crater and forms a strewn field of >400 km2. There is at least 11,250 m3of glass in the strewn field and relative to the size of the crater this is the most abundant ejected impact glass on Earth. The glass population can be subdivided on the basis of shape (74% irregular, 20% ropy, 0.5% spheroid, 6% droplet, and 0.7% elongate) and color (53% dark green, 31% light green, 11% black, and 5% white). The white glasses contain up to 92 wt% SiO2 and are formed from melting of quartzite. Black glasses contain a minimum of 76 wt% SiO2 and formed from melting of shale. Systematic variations in the proportion of glasses falling into each of the color and shape classes relative to distance from the crater show: 1) a decrease in glass abundance away from the crater; 2) the largest fragments of glass are found closest to the crater; 3) small fragments (<2 g) dominate finds close to the crater; 4) the proportion of white glass is greatest closest to the crater; 5) the proportion of black glass increases with distance from the crater and 6) the proportion of splashform glasses increases with distance from the crater. These distribution trends can only be explained by the molten glass having been ballistically ejected from Darwin crater during impact and are related to 1) the depth of excavation from the target rock stratigraphy and/or 2) viscosity contrasts between the high and low SiO2 melt. The high abundance and wide distribution of ejected melt is attributed to a volatile charged target stratigraphy produced by surface swamps that are indicated by the paleoclimate record.

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Tektites That Were Partially Plastic after Completion of Surface Sculpturing

Cited by 14 publications

References 0 publications

An empirical model for the Australasian tektite field

An empirical model for the Australasian tektite field

Magnetic Properties of Australasian Tektites From South China

Physical distribution trends in Darwin glass

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