Dyke swarms of Onenhste and adjacent coronae in Parga Chasmata, SE of Atla Regio, Venus: Detailed mapping, swarm interactions and geological history

IF 2.5 2区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
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引用次数: 0

Abstract

Parga Chasmata is a 10,000 km long rift system on Venus with abundant coronae (enigmatic circular tectonomagmatic features). In order to further investigate the rift-corona relationship, detailed 1:500,000 geological mapping was focused on Onenhste Corona and the surrounding region (16°-24° S, 145°-131° W). More than 46,000 extensional lineaments were mapped and grouped into 50 sets, comprising 17 radiating, 28 circumferential and 5 linear sets (interpreted to overlie mafic dyke swarms). Radiating and circumferential swarms are linked with Onenhste Corona (OC), Momu Coronae (MC), Ulgen-ekhe Coronae (UEC), Rzhanitsa Corona (RzC, centred just outside the study area) and 5 Unnamed Coronae (UC1–5), as well as Malibran Patera (MP) and Fedchenko Patera (FP). Linear swarms are provisionally linked with magmatic centres outside the study area. Crosscutting relationships between the graben sets (dyke swarms) were used to identify the relative ages of magmatic centres. We applied an additional approach to recognize coeval centres, the swinging or deflection of radiating and circumferential dyke swarms to reveal the stress interaction between different coeval centres. The relative ages (oldest to youngest) of the magmatic centres are UC2 > RzC > MC ≥ OC = UC1 = UEC ≥ MP > UC5, and FP > UC3. These new detailed data provide significant information on coronae timing, evolution and relation to rift zones that will serve as a basis for future quantitative studies of lithospheric and mantle evolution and the combined cause and effect of rifting and mantle diapiric upwelling.

Several centres, RzC, UC2, MC, UC3 and FP, ordered from NW to SE, are aligned along a trend parallel to Parga Chasmata but offset about 900 km to the south from the main zone of rifting. It is inferred that this alignment is related to a zone of weakness associated with the rift extension. Along this trend the centres do not show an age progression.

Coronae MC, OC, UC1 and UEC are aligned along the NNE trending P13 Linea, orthogonal to the main Parga Chasmata rift. The main centre, Onenhste, is coeval with UC1, which in turn is coeval with UEC. Additional age relationships indicate that the late stage of OC was active at the same time as MP, MC and the UC2–9 centre of UC2. Linea P13 is older than Chondi Chasma. This study, and continuing, detailed geological mapping and analysis are increasing our understanding of the relationships between the formation of the main WNW trending Parga Chasmata rift zone, the orthogonal trends of rifting and the numerous magmatic centres (mainly coronae) distributed along both trends.

金星阿特拉地区东南部 Parga Chasmata 的奥能赫斯特堤坝群和邻近的冠状岩:详细绘图、岩群相互作用和地质历史
Parga Chasmata 是金星上一个长达 10,000 公里的裂谷系统,其中有大量的日冕(神秘的圆形构造地质特征)。为了进一步研究裂谷与日冕的关系,我们重点对 Onenhste 日冕及其周边地区(南纬 16°-24°,西经 145°-131°)进行了 1:500,000 的详细地质测绘。绘制了 46,000 多条延伸线,并将其分为 50 组,包括 17 组辐射线、28 组环状线和 5 组线状线(解释为岩浆岩堤群的上覆层)。放射状和环状岩群与 Onenhste Corona(OC)、Momu Coronae(MC)、Ulgen-ekhe Coronae(UEC)、Rzhanitsa Corona(RzC,以研究区外为中心)和 5 个无名岩群(UC1-5)以及 Malibran Patera(MP)和 Fedchenko Patera(FP)有关。线状岩群暂时与研究区域外的岩浆中心联系在一起。地堑组(堤群)之间的交叉关系用于确定岩浆中心的相对年龄。我们还采用了另一种方法来识别共生中心,即放射状和环状堤群的摆动或偏转,以揭示不同共生中心之间的应力相互作用。岩浆中心的相对年龄(从最老到最年轻)分别为 UC2 > RzC > MC ≥ OC = UC1 = UEC ≥ MP > UC5 和 FP > UC3。这些新的详细数据提供了有关冠层时间、演化以及与断裂带关系的重要信息,为今后定量研究岩石圈和地幔演化以及断裂和地幔膨胀的综合因果关系奠定了基础。RzC、UC2、MC、UC3 和 FP 等几个中心从西北向东南排列,沿平行于 Parga Chasmata 的趋势排列,但向南偏离主断裂带约 900 公里。据推断,这一走向与裂谷延伸的薄弱地带有关。MC、OC、UC1 和 UEC 角岩沿东北走向的 P13 线排列,与帕尔加-查斯马塔主断裂正交。主中心 Onenhste 与 UC1 属同一时代,而 UC1 又与 UEC 属同一时代。其他年龄关系表明,OC 晚期与 MP、MC 和 UC2 的 UC2-9 中心同时活跃。P13 线比 Chondi Chasma 早。这项研究以及继续进行的详细地质测绘和分析使我们进一步了解了帕尔加-查斯马塔断裂带主西向西走向的形成、正交的断裂趋势以及沿这两条趋势分布的众多岩浆中心(主要是冠状岩)之间的关系。
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来源期刊
Icarus
Icarus 地学天文-天文与天体物理
CiteScore
6.30
自引率
18.80%
发文量
356
审稿时长
2-4 weeks
期刊介绍: Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.
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