Scholarlink

<p>The complex evolution of continental rift systems results from the intricate interplay of external driving forces and the rift system’s responses. For this reason, allowing plate kinematics to emerge from the force balance can provide deeper insights than imposing prescribed velocity boundary conditions. This study investigates the influence of temporally varying driving forces, possibly resulting from changes in slab dynamics, on rift evolution using numerical and semi-analytical models. We examined the effects of varying the timing (<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_19691_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="14" /> </InlineMediaObject> <EquationSource Format="TEX">\(t_i\)</EquationSource> </InlineEquation>), duration (<InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_19691_Article_IEq2.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="19" /> </InlineMediaObject> <EquationSource Format="TEX">\(\delta t\)</EquationSource> </InlineEquation>), and magnitude (<InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_19691_Article_IEq3.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="19" /> </InlineMediaObject> <EquationSource Format="TEX">\(\delta \tau\)</EquationSource> </InlineEquation>) of boundary traction reductions on extension velocities (<InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_19691_Article_IEq4.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="20" /> </InlineMediaObject> <EquationSource Format="TEX">\(V_\text {E}\)</EquationSource> </InlineEquation>). Our models demonstrate that later initiation of traction reduction and slower reduction rates promote continental breakup. A 25% reduction in boundary traction can still lead to continental breakup under optimal conditions, while a 50% reduction generally results in failed rifts. Non-monotonic <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_19691_Article_IEq4.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="20" /> </InlineMediaObject> <EquationSource Format="TEX">\(V_\text {E}\)</EquationSource> </InlineEquation> evolution, including temporary velocity increases during force reduction, is observed and explained by dynamic force balance. Our results show that a continental rift can accelerate towards breakup even when it is currently extending slowly due to a reduced driving force that can arise from many different situations.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Continental rifts losing driving forces can still complete breakup

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月23日

查看全文
  • Kuruvitage Chameera Chathuranga Silva,
  • Eunseo Choi

摘要

The complex evolution of continental rift systems results from the intricate interplay of external driving forces and the rift system’s responses. For this reason, allowing plate kinematics to emerge from the force balance can provide deeper insights than imposing prescribed velocity boundary conditions. This study investigates the influence of temporally varying driving forces, possibly resulting from changes in slab dynamics, on rift evolution using numerical and semi-analytical models. We examined the effects of varying the timing ( \(t_i\) ), duration ( \(\delta t\) ), and magnitude ( \(\delta \tau\) ) of boundary traction reductions on extension velocities ( \(V_\text {E}\) ). Our models demonstrate that later initiation of traction reduction and slower reduction rates promote continental breakup. A 25% reduction in boundary traction can still lead to continental breakup under optimal conditions, while a 50% reduction generally results in failed rifts. Non-monotonic \(V_\text {E}\) evolution, including temporary velocity increases during force reduction, is observed and explained by dynamic force balance. Our results show that a continental rift can accelerate towards breakup even when it is currently extending slowly due to a reduced driving force that can arise from many different situations.