4.7 Article

The Role of Isostasy in the Evolution and Architecture of Fold and Thrust Belts

期刊

LITHOSPHERE
卷 2023, 期 1, 页码 1-11

出版社

GEOSCIENCEWORLD
DOI: 10.2113/2023/8503619

关键词

-

向作者/读者索取更多资源

Warmer conditions in the hinterland facilitate local ductile flow, leading to prevalent Airy-like local isostasy. However, the regional response is better described by flexural isostasy. The interaction between horizontal tectonic mass transfer and vertical isostatic mass transfer impacts the architecture of fold and thrust belts.
Warmer conditions prevalent in the hinterland of orogenic systems facilitate local ductile flow underneath the surface load, making Airy-like local isostasy more prevalent in these domains. In contrast, flexural isostasy better describes the regional response to surface loading of more rigid lithospheres. Here, we explore how the interaction between horizontal tectonic mass transfer and vertical isostatic mass transfer, through either elastic flexure or viscous flow, impacts the overall architecture of fold and thrust belts. We compare numerical models of fold and thrust belts under either an Airy-like ductile isostasy boundary condition or a flexural-like regional isostasy boundary condition. Our experiments suggest that when ductile flow is involved in accommodating isostatic adjustment, subsidence is rather local, larger, and results in narrower, less elevated foldthrust belts with a complex internal architecture consisting of prominent steeply dipping faults. When isostatic subsidence is controlled by lithospheric flexure, the tilting of the basement on 10 s of km scale facilitates the outward propagation of foldthrust belts. The internal architecture is simpler and involves prominent basement-parallel decollements. The outcome is wider fold and thrust belts with higher topographies. A change in lithospheric elastic thickness does not significantly affect foldthrust belt structural styles. Our results are compared to natural examples from the Subandean zone.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据