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\begin{document}

\title{Late Cenozoic transtensional deformation along the Chenghai fault zone
and its constraint on micro-block clockwise rotation in southeastern
Tibetan Plateau}



\author[1]{zhonghai wu}%
\author[2]{xiaolong Huang}%
\author[3]{xiaojin Huang}%
\author[4]{Feng Liu}%
\author[2]{kungang Wu}%
\affil[1]{The Institute of Geomechanics, Chinese Academy of Geological Sciences}%
\affil[2]{Institute of Geomechanics, Chinese academy of geological sciences}%
\affil[3]{School of Civil Engineering and Architecture，Wuyi University}%
\affil[4]{Institute of Geomechanics, Chinese Academy of Geological Sciences}%


\vspace{-1em}



  
  \date{June 10, 2024}


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\begin{abstract}
The Chenghai fault zone, an important part of the Dali fault system, is
instrumental in comprehending the crustal deformation of the
southeastern margin of the Tibetan Plateau. Detailed remote sensing
interpretation and field mapping are used to study the geometry and
kinematic characteristics of this fault. The results show that the
Chenghai fault zone extends up to 200 km from Jinguan to the south end
of the Midu basin, and it truncated and inherited the trace of the Red
River fault on the east side of the Midu basin. Furthermore, it is an
oblique-slip fault with both normal and sinistral strike-slip component,
and the normal component is more significant. The transtensional
activity of this fault may have started in the Early Pliocene (5--6 Ma).
The average maximum dip-slip rate can be 0.37--0.57 mm/yr, and the
maximum left-slip rate is 0.83--1.20 mm/yr. The clockwise rotation of
the Dali block resulted in the Z-shaped Dali fault system and the
Chenghai fault zone. Moreover, the difference of angular velocity
between the inner and the outer arcuate belts divided by the
Litang--Dali--Ruili fault system leads to the clockwise rotation of the
Dali block.%
\end{abstract}%



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