North American Commission on Stratigraphic Nomenclature Report 12

Easton, R.M.; Edwards, Lucy E.; Orndorff, Randall C.; Duguet, M.; Ferrusquía-Villafranca, Ismael

doi:10.29041/strat.13.3.220-222

Cited by 6 publications

(2 citation statements)

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“…Also shown in figure 1 are two globally extensive lithodemic units, ribbon-tessera terrain and fracture zone terrain [3,12,13]. Lithodemic units-highly metamorphosed or intensely deformed rock assemblages-do not generally conform to the geological Law of Superposition [25,26]. Tesserae, a distinctive fabric of structures indicative of orthogonal layer shortening and extension, is characteristic of crustal plateax and occurs in lowland exposures; it marks the oldest recognizable geologic unit [1][2][3]20,[27][28][29].…”

Section: Venus a Global Perspectivementioning

confidence: 99%

Global tectonic evolution of Venus, from exogenic to endogenic over time, and implications for early Earth processes

Hansen¹

2018

Phil. Trans. R. Soc. A.

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Section: Venus a Global Perspectivementioning

confidence: 99%

Global tectonic evolution of Venus, from exogenic to endogenic over time, and implications for early Earth processes

Hansen¹

2018

Phil. Trans. R. Soc. A.

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“…Sedimentary strata commonly consist of multiple rock types, interbedded at several scales, with sharp or gradational contacts, and are mapped as a "formation" without abandoning well-established sedimentary nomenclature. Heterogeneous intrusive igneous rocks, composed of multiple rock types with gradational contacts, can be mapped as lithodemes or as suites (e.g., Tuolumne Intrusive Suite; see Easton et al, 2016) without abandoning well-established IUGS nomenclature for igneous rocks. The description of the physical characteristics of the rock types, nature of the contacts, comprising mappable lithodemes or suites, along with the IUGS names, are included in its formal description.…”

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confidence: 99%

A More Informative Way to Name Plutonic Rocks — Comment by Hogan

Hogan¹

2019

GSAT

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Mapping of Geologic Structures in the Niobe‐Aphrodite Map Area of Venus: Unraveling the History of Tectonic Regime Change

Hansen

López

2018

JGR Planets

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Recent construction of 1:10 M IMaps of Niobe Planitia and Aphrodite Terra paints a rich picture of Venus evolution. Using the Niobe‐Aphrodite map area (>25% of Venus) as an example, we illustrate the methodology and importance of detailed structural mapping at large regional scales in order to identify tectonic domains that lead to the discovery of global‐scale geodynamic evolution and operative processes. We highlight differences between lithodemic and lithostratigraphic units in geologic mapping. We step through a series of structural element maps that reveal the character of at least three different tectonic domains and evolving tectonic regimes that reflect changing geodynamic processes, here divided into three eras. The ancient era encompasses formation of tessera terrain and represents a time of unique global and environmental conditions marked by globally thin lithosphere. The second era resulted in formation of the Artemis superstructure. The ~13,000‐km‐diameter footprint of the Artemis superstructure is huge but not global, although associated mantle flow patterns could have had a global reach. As formation of the Artemis superstructure waned, tectonic activity became more focused leading to formation of the fracture zone complex. This complex extends beyond the map area connecting with Atla, Beta, and Themis regiones and associated fracture zones, marking the youngest era. Structural mapping of the Niobe‐Aphrodite map area indicates that Venus exhibits a complex, multistage history like other terrestrial planets, which probably extends to several billion years. Given that Venus never developed plate tectonics, Venus' preserved surface record is likely significantly richer than that of Earth.

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North American Commission on Stratigraphic Nomenclature Report 12

Cited by 6 publications

References 0 publications

Global tectonic evolution of Venus, from exogenic to endogenic over time, and implications for early Earth processes

Global tectonic evolution of Venus, from exogenic to endogenic over time, and implications for early Earth processes

A More Informative Way to Name Plutonic Rocks — Comment by Hogan

Mapping of Geologic Structures in the Niobe‐Aphrodite Map Area of Venus: Unraveling the History of Tectonic Regime Change

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