Timing of the faulting on the Wispy Terrain of Dione based on stratigraphic relationships with impact craters

Hirata, Naoyuki

doi:10.1002/2016je005176

Cited by 3 publications

(2 citation statements)

References 27 publications

(60 reference statements)

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“…3), and the effective density for this crater is 1/A(D i ). The cumulative density N c (D > D c ) is the sum of each effective density for all craters with D i > D c (Tanaka 1982;Hirata 2016):…”

Section: The Buffered Crater Counting (Bcc) Approachmentioning

confidence: 99%

Formation age of the Rima Sharp sinuous rill on the Moon, source of the returned Chang’e-5 samples

Qiao

2022

A&A

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Context. In December 2020, China’s Chang’e-5 spacecraft successfully returned 1731 g of lunar samples to Earth. Rima Sharp, one of the longest sinuous rilles on the Moon, lies very near (<20 km) to the Chang’e-5 sampling site and is very likely to be the source of the returned samples. Constraining its formation age would provide key references for the ongoing sample analyses. Aims. Our intent is to obtain the accurate formation ages of Rima Sharp and related lunar rilles through crater population studies and to assess their implications for the Chang’e-5 sample analyses and interpretations. Methods. We utilized two separate techniques to measure and analyze craters that were formed after the formation of the studied sinuous rilles: the conventional crater statistics for the rille floors and the buffered crater statistics that are specialized in the dating of narrow linear features. We were able to carefully compare the results derived from the two methods and estimate the formation ages of these rilles. Results. We suggest that the buffered crater statistic method produces more reliable ages for the studies rilles than the conventional method. The formation sequence of sinuous rilles around the Chang’e-5 site is proposed as follows, in chronological order: Rimae Harpalus, Louville, Sharp, and Mairan. The basalt samples returned by Chang’e-5 are likely to have mainly been sourced from Rima Sharp, with an estimated age of ~1.7 Ga based on the crater N(1) value (spatial density of craters ±1 km in diameter) of (2.10 ± 0.20) × 10−3 km−2 and the new crater chronology function (CF). The other, younger rille, Rima Mairan, which was formed ~1.0 Ga (N(1) = (1.17 ± 0.20) × 10−3 km−2 and with the same CF), may also contribute to the basaltic deposits at the landing site. These crater count statistics and dating results can be coordinated with the radio-isotopic age of Chang’e-5 samples for a recalibration of lunar impact flux and the crater population dating method.

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Section: The Buffered Crater Counting (Bcc) Approachmentioning

confidence: 99%

Formation age of the Rima Sharp sinuous rill on the Moon, source of the returned Chang’e-5 samples

Qiao

2022

A&A

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“…In addition, the possibility of a subsurface ocean under the satellite's ice shell brought a promise of a still active surface and a potential for life under the icy cover [10]. The study of the stratigraphic relationship between the craters and faults on the Wispy Terrain suggests that the faulting is a geologically very recent event, dating back to 0.3-0.79 Ga [11]. Some of the newest studies go even further and suggest that the upper limit for the age of the studied fault on Dione's Wispy Terrain is only 152 Ma, which supports the hypothesis that the cryotectonism might be still active or was active a very short time ago (ca.…”

Section: Introduction 1the Wispy Terrainmentioning

confidence: 99%

Introduction to Dione’s Wispy Terrain as a Putative Model Region for “Micro” Wilson Cycles on Icy Satellites

Bradák,

Kimura,

Asahina

et al. 2023

Remote Sensing

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The Wispy Terrain is the region of chasmata characterized by quasi-parallel fault systems, formed by extensional and shear stresses of the icy crust of Dione, a moon of Saturn. Besides the basic, satellite-scale geological mapping and very general definition of the phenomenon, only a few studies focus on the Wispy Terrain and its chasmata from the angle of detailed tectonic reconstruction, with others mainly targeting, e.g., the timing of its formation. This study provides a detailed geological and cryotectonic analysis in the surroundings of the Eurotas and Palatine Chasmata and proposes additional, until now, unidentified tectonic processes and a formation model. The relationship between fragmentary impact craters and tectonic features indicates other newly suspected tectonic movements, namely thrust, and splay and décollement fault systems. In contrast to the commonly expected and identified dilatational processes, such fault types show compression and are characteristic of subduction in a terrestrial environment. Theoretically, the appearance of such tectonic processes means that the already-known rift and the newly discovered subsumption (subduction-like) processes may appear together in the Wispy Terrain. The appearance of both features may suggest the presence of some of the components (phases) of a Wilson cycle analog cryotectonic cycle (or possibly cycles) in icy planetary bodies like Dione.

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Stacking Lake Ice Analog Cryotectonic Dynamics on Dione’s Wispy Terrain

Bradák

Novák

Gomez

2023

The 2nd Electronic Conference on Universe

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Timing of the faulting on the Wispy Terrain of Dione based on stratigraphic relationships with impact craters

Cited by 3 publications

References 27 publications

Formation age of the Rima Sharp sinuous rill on the Moon, source of the returned Chang’e-5 samples

Formation age of the Rima Sharp sinuous rill on the Moon, source of the returned Chang’e-5 samples

Introduction to Dione’s Wispy Terrain as a Putative Model Region for “Micro” Wilson Cycles on Icy Satellites

Stacking Lake Ice Analog Cryotectonic Dynamics on Dione’s Wispy Terrain

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