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\begin{document}

\title{Exhumation of metamorphic core complexes through progressive doming and
detachment faulting: insights from the Cretaceous Liaonan metamorphic
core complex, eastern North China craton}



\author[1]{Yuanyuan Zheng}%
\author[1]{Junlai Liu}%
\author[2]{Chunru Hou}%
\author[3]{Yanqi Sun}%
\author[4]{John P. Craddock}%
\affil[1]{China University of Geosciences (Beijing)}%
\affil[2]{China University of Geosciences}%
\affil[3]{China university of geosciences, Beijing}%
\affil[4]{Macalester College}%


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  \date{May 25, 2024}


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\begin{abstract}
To better understand the mechanisms of crustal exhumation related to
tectonic extension, we report on the progressive doming and detachment
faulting of the Cretaceous Liaonan metamorphic core complex (MCC). The
detachment fault zone of Liaonan MCC is comprised of two branches, i.e.,
the Jinzhou detachment fault zone (JDFZ) and the poorly-researched
Dongjiagou shear zone (DSZ). Thus, integrated structural,
microstructural, quartz c-axis fabrics, and fluid inclusion analysis,
and U-Pb on zircon dating were performed on mylonites along the DSZ. In
contrast with the JDFZ that possesses characteristics of detachment
fault zone, the DSZ encompasses Archean gneisses and Neoproterozoic
meta-sedimentary rocks, between which exists an obvious metamorphic
contrast forming a tectonic discontinuity contact (TDC). However, rocks
from both sides of the TDC possess structures and fabrics for identical
geometries and kinematics that are consistent with those along the JDFZ.
Thermometric analysis of fluid inclusions from syn-tectonic quartz veins
(630 \selectlanguage{ngerman}°C, 470 °C, 350 °C) and quartz c-axis fabric from mylonites along
the DSZ show that the shearing penetrates throughout the Archean to
Neoproterozoic rocks. Dating of zircons from syn-kinematic granitic
dikes from DSZ yields an age ca. 134 Ma, which is similar to the ages of
early shearing along the JDFZ (ca. 133\textasciitilde{}134 Ma). The
results imply that the shearing initiated in both JDFZ and DSZ at an
early stage, then progressive shearing continued, and finally developed
the detachment faulting along the JDFZ. Based on the timing and
processes of the regional extension, a geodynamic model of MCC's is
proposed.%
\end{abstract}\selectlanguage{ngerman}%



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