Headward growth of chasmata by volatile outbursts, collapse, and drainage: Evidence from Ganges chaos, Mars
Headward growth of chasmata by volatile outbursts, collapse, and drainage: Evidence from Ganges chaos, Mars
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DOI：
10.1029/2006gl026275
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发表时间：
2006-09
影响因子：
5.2
通讯作者：
J. A. Rodriguez;J. Kargel;D. Crown;L. Bleamaster;Kenneth L. Tanaka;V. Baker;H. Miyamoto;J. Dohm;S. Sasaki;G. Komatsu
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文献类型：
--
作者：
J. A. Rodriguez;J. Kargel;D. Crown;L. Bleamaster;Kenneth L. Tanaka;V. Baker;H. Miyamoto;J. Dohm;S. Sasaki;G. Komatsu
卡普里、埃俄斯和恒河峡谷崩塌过程的性质和意义仍然知之甚少。以恒河裂谷为类型，这些裂谷被解释为多个混沌地形聚集和同化的结果，主要是由局部降压诱导或热触发的埋藏气体笼形水合物解离和气体饱和地下水的爆炸性喷发形成的。这种地壳不稳定可能是由以下因素引起的：(1)火星表面的深层裂缝扩展，(2)岩浆侵入和相关的加热和膨胀引起的地形破裂，以及/或(3)气候融化和笼形物和富含天然气的地下水带上的永久冻土变薄/变弱。由于气体的释放导致地表地下水和流态化沉积物的排出，体积增加，从而雕刻出峡谷周边较高的流出通道，以及峡谷和流出通道的较低流出通道底板。
The nature and significance of collapse processes in Capri, Eos, and Ganges Chasmata remain poorly understood. Using Ganges Chasma as a type locality, these chasmata are interpreted to be the result of clustering and assimilation of multiple chaotic terrains, which primarily formed by localized depressurization‐induced or thermally‐triggered dissociation of buried gas clathrate hydrates and explosive eruption of gas‐saturated ground water. Such crustal destabilization could have been triggered by (1) deep fracture propagation from the Martian surface, (2) magmatic intrusions and associated heating and inflation‐induced terrain fracturing, and/or (3) climatic thaw and thinning/weakening of the permafrost over the clathrate and gas‐rich groundwater zones. Volume increases associated with release of gases contributed to the expulsion of groundwater and fluidized sediments at the surface, thereby carving the higher outflow channels peripheral to the chasmata and the lower outflow channel floors of the chasmata and outflow channels.