Formation of the double rift system in the Thaumasia Highlands, Mars
Formation of the double rift system in the Thaumasia Highlands, Mars
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DOI：
10.1029/2006je002800
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发表时间：
2007-06
影响因子：
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通讯作者：
M. Grott;P. Kronberg;E. Hauber;B. Cailleau
中科院分区：
文献类型：
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作者：
M. Grott;P. Kronberg;E. Hauber;B. Cailleau
thumasia Highland裂谷是位于火星thumasia地区南部的thumasia高地带中两个复杂的地堑构造。这些裂谷相距90-130公里，几乎是半平行的，代表了一种非常不寻常的地壳变形方式。我们研究了造成这种特殊裂陷方式的机制，发现火山弱带的应变局部化是断层模式形成的主要因素，表明该地区广泛存在前裂和共裂谷火山活动。这一结果与裂谷侧隆升估计的裂谷侵位时的高热流一致。研究结果表明，火山活动的发生早于裂谷的形成，岩浆活动及其伴生的岩石圈弱带控制着裂谷的位置。模拟结果与NW-SE ~ NNW-SSE方向伸展的观测结果吻合较好，有利于岩浆构造活动环境下被动裂陷的形成情景。
[1] The Thaumasia Highland Rifts are two complex graben structures in the Thaumasia Highland belt, located in the southern Thaumasia region, Mars. The rifts are arranged 90–130 km apart in a nearly subparallel setting and represent a very unusual style of crustal deformation. We have investigated the mechanism responsible for this peculiar style of rifting and found strain localization by volcanic weak zones to be a major factor for fault-pattern formation, indicating widespread prerift and synrift volcanic activity in the region. This result is consistent with the high heat flow during rift emplacement as estimated from rift flank uplift. Our results indicate that the onset of volcanism predates the rift formation process and that magmatism and the associated lithospheric weak zones control the rift locations. The simulations performed here are in good agreement with the observations for extension in the NW–SE to NNW–SSE direction, and we favor a formation scenario involving passive rifting in a magmatectonically active environment.