Respected Prof. Rob Butler, Your channel is blessing for all those, who are related with structural geology and tectonics by one or other way. Thank you so much by making “best structural geologist of all the times” available on RUclips for every scholar and teacher in the field of geosciences. This video made me to understand the fold axis of anticlines, developed due to leftward bend and left step-over of a left lateral strike-slip fault. Possibly, only rely on strain ellipsoids would lead to misinterpretation in this case.
Not sure I understand your question. Relay ramps are the pieces between soft-linked fault segments. You can argue that in a system of wrench shear, the initial faults form "en echelon" so that overlaps will be a common motif until the system breaks through into a single strand....
@@robbutler2095 Sorry sir, to make you be not sure about my mean. What I mean is that, just as I often ask stress topics in the lecture series, if we take the crust as our study object and discuss such regional tectonic belts, maybe we can use the Andson' dynamic model on faulting. That is in another viewpoint but not only from the kinematics to talk the causes. The strike slipping, normal faulting, and thrust and contraction region can be three different areas once governed by three different stress fields respectively. In such a strike slip zone, tectonically speaking, in most time the whole regions including any relay ramp places, should belong to the strike slip stress field. But when magmatism become active, some relay places such as in the relay left lateral and left step slip zone (LL) or dextral and right step zone (RR) , may grow some extensional structures. But in some other time, when magmatism is too poor, some relay places in LR or RL slip zones, may appear contractional structures (reverse faults, thrust or vertical folds). However, in most circumstances (time scale), strike slip governs the region. Therefore, i suggest that " can we consider the relay zone as the functional boundary of two different stress fields". Structures are often too complex to discuss by only kinematic viewpoints. For example, "pull apart basin", it may not be certain to say the basin is caused by strike slip. Sometimes can, sometimes not.
Classically these are called pull-aparts, formed at releasing bends, jogs in the trend of major strike-slip faults.... though in practice extensional basins in strike slip systems probably form in general at "soft-linked" relays. There's a section on these structures in the video.
@@charlottegibson1817 Many sedimentary basins have complex evolutions that chart changing tectonic kinematics. Probably the easiest to get into are those that experienced tectonic inversion - check out the video on that topic ... but even rifted continental margins experience complex tectonics - through gravitational collapse (making thrust belts) and, especially, salt tectonics. There are examples in the seismic interpretation playlist here.
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Respected Prof. Rob Butler, Your channel is blessing for all those, who are related with structural geology and tectonics by one or other way. Thank you so much by making “best structural geologist of all the times” available on RUclips for every scholar and teacher in the field of geosciences.
This video made me to understand the fold axis of anticlines, developed due to leftward bend and left step-over of a left lateral strike-slip fault. Possibly, only rely on strain ellipsoids would lead to misinterpretation in this case.
Glad you're finding the films useful!
Hello, rob sir, how can I personally reach you to discuss about some tectonics of northeast india.
I google.... easy to find me - also on LinkedIn but I don't want to post my contact details here
is it ok if i share you may email and contact no. Here
Can the relay region be taken as an interaction area or functional boundary of two different stress fields?
Not sure I understand your question. Relay ramps are the pieces between soft-linked fault segments. You can argue that in a system of wrench shear, the initial faults form "en echelon" so that overlaps will be a common motif until the system breaks through into a single strand....
@@robbutler2095 Sorry sir, to make you be not sure about my mean. What I mean is that, just as I often ask stress topics in the lecture series, if we take the crust as our study object and discuss such regional tectonic belts, maybe we can use the Andson' dynamic model on faulting. That is in another viewpoint but not only from the kinematics to talk the causes. The strike slipping, normal faulting, and thrust and contraction region can be three different areas once governed by three different stress fields respectively. In such a strike slip zone, tectonically speaking, in most time the whole regions including any relay ramp places, should belong to the strike slip stress field. But when magmatism become active, some relay places such as in the relay left lateral and left step slip zone (LL) or dextral and right step zone (RR) , may grow some extensional structures. But in some other time, when magmatism is too poor, some relay places in LR or RL slip zones, may appear contractional structures (reverse faults, thrust or vertical folds). However, in most circumstances (time scale), strike slip governs the region. Therefore, i suggest that " can we consider the relay zone as the functional boundary of two different stress fields".
Structures are often too complex to discuss by only kinematic viewpoints. For example, "pull apart basin", it may not be certain to say the basin is caused by strike slip. Sometimes can, sometimes not.
What are the type of strike-slip basins that can form? and what are their names?
Classically these are called pull-aparts, formed at releasing bends, jogs in the trend of major strike-slip faults.... though in practice extensional basins in strike slip systems probably form in general at "soft-linked" relays. There's a section on these structures in the video.
@@robbutler2095 Thank you for your reply, I am curious about polygenetic and polyhistoric basins and what they may appear like in seismic profiles.
@@charlottegibson1817 Many sedimentary basins have complex evolutions that chart changing tectonic kinematics. Probably the easiest to get into are those that experienced tectonic inversion - check out the video on that topic ... but even rifted continental margins experience complex tectonics - through gravitational collapse (making thrust belts) and, especially, salt tectonics. There are examples in the seismic interpretation playlist here.