The steep, high‐relief eastern margin of the Tibetan Plateau has undergone rapid Cenozoic cooling and denudation yet shows little evidence for large‐magnitude shortening or accommodation generation in the foreland basin. We address this paradox by using a variety of geomorphic observations to place constraints on the kinematics and slip rates of several large faults that parallel the plateau margin. The Beichuan and Pengguan faults are active, dominantly dextral‐slip structures that can be traced continuously for up to 200 km along the plateau margin. Both faults offset fluvial fill terraces that yield inheritance‐corrected, cosmogenic 10Be exposure ages of <15 kyr, indicating latest Pleistocene activity. The Pengguan fault appears to have been active in the Holocene at two sites along strike. Latest Quaternary apparent throw rates on both faults are variable along strike but are typically <1 mm yr−1. Rates of strike‐slip displacement are likely to be several times higher, probably ∼1–10 mm yr−1 but remain poorly constrained. Late Quaternary folding and dextral strike‐slip has also occurred along the western margin of the Sichuan Basin, particularly associated with the present‐day mountain front. These observations support models for the formation and maintenance of the eastern plateau margin that do not involve major upper crustal shortening. They also suggest that activity on the margin‐parallel faults in eastern Tibet may represent a significant seismic hazard to the densely populated Sichuan Basin.
[1] The eastern margin of the Tibetan Plateau combines very high relief with almost no Tertiary foreland sedimentation and little evidence of Cenozoic tectonic shortening. While river incision and landscape development at the plateau margin have received significant attention over the last decade, little is known about the Cenozoic development of the adjacent Sichuan Basin. Here we assess the Cenozoic thermal history of this basin using detrital apatite fission track (AFT) and (U-Th)/He techniques and establish the presence of an exhumed AFT paleopartial annealing zone across much of the basin. This observation, combined with stratigraphic and borehole sections and inverse modeling of confined apatite fission tracks, indicates that the strata within the basin have undergone accelerated cooling after $40 Ma, consistent with the widespread erosion of $1 to 4 km of overlying sedimentary material. This regional-scale erosion is most likely a response to changes in the Yangtze River system draining and removing sediment from the basin. The base-level fall associated with this erosion contributed to a relative increase in relief across the Longmen Shan and may have helped drive Miocene-Recent incision and unloading of the plateau margin.
The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Like the other large river systems that drain the India-Asia collision, the Yangtze River was 17 assembled through a series of Cenozoic capture events. These events are important for 18 orogenic erosion and sediment delivery, but their timing remains largely unknown. Here we 19 identify enhanced cooling in the Three Gorges region in central China, a key capture site 20 during basin development, beginning at 40-45 Ma. This event is not visible in regional 21 thermochronological data but is near-contemporaneous with the onset of widespread 22 denudation in the Sichuan Basin, just upstream of the Three Gorges. While we cannot rule out 23 alternative explanations, the simplest mechanism that links these events is progressive capture 24
Research on desistance emphasizes the importance of the transformation narrative, in which the individual has replaced his old, criminal self with a new, law-abiding self. Key elements of the transformation narrative are generative motivations, the core self, and a sense of agency. Thus far, it is not known what role these elements play in desistance among released lifers. To fill this caveat, we conducted in-depth life interviews with 67 individuals who had served a life sentence. Almost all interviewees presented a transformation narrative that included a good core self and generative motivations, including those who persisted in criminal behavior. We found that individual agency was a key factor distinguishing the paroled lifers from the re-incarcerated lifers. Findings suggest that rather than learning to present a transformation narrative focused on reflecting a good core self and generative motivations, (post-)prison programs should focus on restoring agency to ensure successful re-entry.
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