Geological mapping and characterization of the NW-Phoebe volcano-magmatic center on Venus

IF 1.8 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Planetary and Space Science Pub Date : 2024-12-01 DOI:10.1016/j.pss.2024.105996

E.G. Antropova , C.H.G. Braga , R.E. Ernst , H. El Bilali , J.W. Head , K.L. Buchan , A. Shimolina

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引用次数: 0

Abstract

Detailed geological mapping (at 1:500,000 scale) of the area located in the eastern part of the BAT region, northwest of Phoebe Regio (∼4°N to 1°S; ∼85° to 78°W) using Magellan SAR images has distinguished 48 volcano-tectonic units and 22 structural units. Stratigraphically, the oldest units are represented by fragments of the tesserae, densely lineated plains and other plains units. Younger units include lobate flow fields oriented in various directions (NE, E, SW) and flows associated with shield clusters.

The post-tesserae evolutionary model proposed for this region distinguishes two Stages, early (I) and late (II), and explains the sequence of formation of all the geological features in terms of intraplate magmatism. Stage I consists of multiple corona structures and associated volcanism that are widely dispersed over the study area. Stage II consists of an intermediate-scale volcano with multiple lava flows radiating approximately from its center, and a field of small shield volcanoes near the summit. The units of Stage II appear to be approximately coeval and to define a distinct volcanic event covering an areal extent of ⁓250,000 km², that we have termed the NW-Phoebe event.

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金星NW-Phoebe火山岩浆中心的地质填图与特征

该区域的详细地质填图（1:50万比例尺）位于BAT地区东部，Phoebe地区西北部(~ 4°N至1°S；~ 85°至78°W)利用麦哲伦SAR图像区分了48个火山构造单元和22个构造单元。在地层学上，最古老的单位是由镶嵌岩的碎片、密集线状的平原和其他平原单位代表的。较年轻的单元包括面向不同方向的叶状流场（NE， E， SW）和与屏蔽簇相关的流场。建立了该地区早期（ⅰ）和晚期（ⅱ）演化模型，并从板内岩浆作用的角度解释了各地质特征的形成顺序。第一阶段包括广泛分布于研究区内的多个日冕构造和伴生火山活动。第二阶段包括一座中等规模的火山，多条熔岩流大约从其中心向外辐射，以及山顶附近的小型盾状火山。第二阶段的单元似乎大约是同一时期的，并定义了一个面积为⁓250,000 km2的独特火山事件，我们称之为NW-Phoebe事件。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Planetary and Space Science 地学天文-天文与天体物理

CiteScore

5.40

自引率

4.20%

发文量

126

审稿时长

15 weeks

期刊介绍： Planetary and Space Science publishes original articles as well as short communications (letters). Ground-based and space-borne instrumentation and laboratory simulation of solar system processes are included. The following fields of planetary and solar system research are covered: • Celestial mechanics, including dynamical evolution of the solar system, gravitational captures and resonances, relativistic effects, tracking and dynamics • Cosmochemistry and origin, including all aspects of the formation and initial physical and chemical evolution of the solar system • Terrestrial planets and satellites, including the physics of the interiors, geology and morphology of the surfaces, tectonics, mineralogy and dating • Outer planets and satellites, including formation and evolution, remote sensing at all wavelengths and in situ measurements • Planetary atmospheres, including formation and evolution, circulation and meteorology, boundary layers, remote sensing and laboratory simulation • Planetary magnetospheres and ionospheres, including origin of magnetic fields, magnetospheric plasma and radiation belts, and their interaction with the sun, the solar wind and satellites • Small bodies, dust and rings, including asteroids, comets and zodiacal light and their interaction with the solar radiation and the solar wind • Exobiology, including origin of life, detection of planetary ecosystems and pre-biological phenomena in the solar system and laboratory simulations • Extrasolar systems, including the detection and/or the detectability of exoplanets and planetary systems, their formation and evolution, the physical and chemical properties of the exoplanets • History of planetary and space research