کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6430821 | 1634829 | 2011 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Vertical and lateral collapse of Tharsis Tholus, Mars Vertical and lateral collapse of Tharsis Tholus, Mars](/preview/png/6430821.png)
Tharsis Tholus, a more than 3.9Â Ga old composite shield volcano to the east of the major Tharsis Montes, has experienced a complex history of growth and destruction. On the basis of new high resolution images we analysed the morphology as well as the tectonic structures of the Tharsis Tholus volcano in detail. From morphological data, cross-cutting relations of the surface structures, and crater modelling ages we propose a chronostratigraphy for the volcano-tectonic history of Tharsis Tholus.The strongly faulted volcano reveals two large-scale landslide events followed by two subsequent shield re-growth phases between 3.8 and 1.7Â Ga and two caldera collapses. Tharsis Tholus was also affected by regional extensional tectonics between 1.7Â Ga and 0.4Â Ga recorded by sub-parallel sets of NE trending graben structures. The steep and up to 5.4Â km high landslide scarps on Tharsis Tholus suggest deep faulting of the edifice. In order to confirm this hypothesis we used analogue sand box models in which we demonstrated that gravitational flank movement on top of weak basal substrata may have produced the deformation structures as observed on Tharsis Tholus.
Research highlightsâºIdentification of several flank deformation events and shield re-growth phases âºAnalogue modelling of flank collapse caused by basal spreading âºDerivation of surface ages on different sectors of the edifice âºChronological reconstruction of major volcano-tectonic events at Tharsis Tholus
Journal: Earth and Planetary Science Letters - Volume 305, Issues 3â4, 15 May 2011, Pages 445-455