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<p class="MsoNormal" style="margin:0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="color:rgb(0,0,0)" lang="EN-GB"><span class="gmail_default" style="font-family:arial,sans-serif;color:rgb(61,133,198)"></span>Dear Colleagues (apologies for cross-posting),<span></span></span></p>

<p class="MsoNormal" style="margin:0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="color:rgb(0,0,0)" lang="EN-GB"><span> </span></span></p>

<p class="MsoNormal" style="margin:0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="color:rgb(0,0,0)"><span lang="EN-GB">As we approach the abstract deadline for <b>GSA
Connects 2023 </b>(15-18 October 2023, Pittsburgh, Pennsylvania, USA), I wanted
to re-advertise our <b>Topical Session T163 </b>- </span><b><span lang="EN-US"><i>Significance of Subduction-Accretion Complexes & Mélanges in Orogenic
Belts and in Continental Growth during the Precambrian and Phanerozoic.</i><span></span></span></b></span></p>

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<p class="MsoNormal" style="margin:0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="color:rgb(0,0,0)" lang="EN-US">Conveners:<span></span></span></p>

<p class="MsoNormal" style="margin:0cm 14.1pt 0cm 0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="color:rgb(0,0,0)" lang="EN-US">Andrea Festa (University of
Torino, Italy)<span></span></span></p>

<p class="MsoNormal" style="margin:0cm 14.1pt 0cm 0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="color:rgb(0,0,0)" lang="EN-US">Yildirim Dilek (Miami
University, USA)<span></span></span></p>

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<p class="MsoNormal" style="margin:0cm 14.1pt 0cm 0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><b style="color:rgb(0,0,0)"><span lang="EN-US">See below for a detailed session description.<span></span></span></b></p>

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<p class="MsoNormal" style="margin:0cm 14.1pt 0cm 0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="color:rgb(0,0,0)"><b><span lang="EN-US">Deadline</span></b><span lang="EN-US"> for abstract submissions is <b>25^th July
2023, 11:59 PM, Pacific Time<span></span></b></span></span></p>

<p class="MsoNormal" style="margin:0cm 14.1pt 0cm 0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><a href="https://protect-au.mimecast.com/s/1ycDCXLW2mU4p6pogc6ET7v?domain=gsa.confex.com" style="text-decoration:underline;color:rgb(0,0,0)" target="_blank"><span lang="EN-US">https://gsa.confex.com/gsa/2023AM/cfp.cgi</span></a><span style="color:rgb(0,0,0)"><span lang="EN-US"><span></span></span></span></p>

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<p class="MsoNormal" style="margin:0cm 14.1pt 0cm 0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><b style="color:rgb(0,0,0)"><span lang="EN-US"><span> </span></span></b></p>

<p class="MsoNormal" style="margin:0cm 14.1pt 0cm 0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="color:rgb(0,0,0)" lang="EN-US">We are look forward to meeting you in Pittsburgh,<span></span></span></p>

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<p class="MsoNormal" style="margin:0cm 14.1pt 0cm 0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="color:rgb(0,0,0)" lang="EN-US">Best Regards,<span></span></span></p>

<p class="MsoNormal" style="margin:0cm 14.1pt 0cm 0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="color:rgb(0,0,0)" lang="EN-US">Andrea Festa and Yildirim
Dilek<span></span></span></p>

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<p class="MsoNormal" style="margin:0cm 14.1pt 0cm 0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><b style="color:rgb(0,0,0)"><span lang="EN-US"><span> </span></span></b></p>

<p class="MsoNormal" style="margin:0cm 14.1pt 0cm 0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><b style="color:rgb(0,0,0)"><span lang="EN-US">Summary of the session:<span></span></span></b></p>

<p class="MsoNormal" style="margin:0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="color:rgb(0,0,0)" lang="EN-US">Subduction-accretion complexes (SAC)
and mélanges are significant components of active continental margins and
provide critical constraints for the timing and mode of the development of
orogenic belts and continental growth. Modern accretionary orogenic belts mark
the Circum–Pacific region, and ancient examples include the Central Asian
Orogenic Belt. The collisional Rif–Maghrebides–Apennines, Alpine–
Himalayan–Tibetan, Uralides, Taiwan, Papuan, and Appalachian orogenic belts
underwent major episodes of collision tectonics, following the development of
vast SACs with ~400-km-width (i.e., Makran) and nearly 30 km thickness (i.e.,
Taiwan). Hence, the growth of average continental crust in these orogenic belts
had already started in submarine conditions, prior to the collisional events,
and the construction of accretionary prisms through time produced average
continental crust. <span></span></span></p>

<p class="MsoNormal" style="margin:0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="color:rgb(0,0,0)" lang="EN-US"><span> </span></span></p>

<p class="MsoNormal" style="margin:0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="color:rgb(0,0,0)" lang="EN-US">Diagnostic rock assemblages in the
SACs in these two major types of orogenic belts are excellent archives for the
dynamic, and lateral/vertical construction of accretionary wedges through
off-scraping–underplating, seamount and oceanic plateau accretion,
mass–transport movements, mélange formation, and return flow exhumation in
subduction channels. SACs commonly display major differences in their time and
mode of formation, crustal anatomies, and geochemical signatures of their rock
units. Documentation of the P-T-t paths of various rock assemblages in orogenic
belts provides significant quantitative constraints for the subduction–accretion,
tectonic burial, and exhumation phases of mountain belt development. Subduction
and/or accretion of structural inheritances, seamounts, oceanic plateaus, and
microcontinents at oceanic trenches, as well as the occurrence of stratigraphic
heterogeneities in the subducting Ocean Plate Stratigraphy (OPS) and the
lithological makeup of Ocean–Continent transition Zones (OCTZ) are significant
drivers for migrations–jumps of subduction plate interface and polarity flips
during orogenic buildup, and strongly affect the structural architecture of
SACs. Overall, all these processes contribute to the complexities in the
anatomies of SACs along and across their strike, the formation of different
types of mélanges, and the structural makeup of orogenic belts. They also pose
major challenges for Earth scientists in deciphering the spatial and temporal
evolutionary histories of orogenic belts. <span></span></span></p>

<p class="MsoNormal" style="margin:0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="color:rgb(0,0,0)" lang="EN-US"><span> </span></span></p>

<p class="MsoNormal" style="margin:0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="color:rgb(0,0,0)"><span lang="EN-US">We welcome contributions,
documenting the significance of SACs and mélanges in the evolution of orogenic
belts and in continental growth during the Precambrian and Phanerozoic.
Presentations based on interdisciplinary approach (field–based structural,
stratigraphic, geochemical–petrological, geochronological, geophysical,
geodynamic, and numerical & analogue modelling) to the delineation of SACs
in the Precambrian and Phanerozoic rock records, and addressing the
sedimentological, tectonic, metamorphic, and magmatic mechanisms and processes
involved in their formation are encouraged. We are particularly interested in
those studies, which utilize different methods of quantifying the rates of
crustal growth, uplift, and topographic buildup in SACs at modern and active
convergent margins.</span><span lang="EN-US"><span></span></span></span></p>

<p class="MsoNormal" style="margin:0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><b style="color:rgb(0,0,0)"><i><span lang="EN-US"><span> </span></span></i></b></p>

<p class="MsoNormal" style="margin:0cm;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="color:rgb(0,0,0)"><b><i><span lang="EN-US">Endorsed by</span></i></b><span lang="EN-US">: </span><span lang="EN-US">GSA Structural Geology and Tectonics Division;
GSA Geophysics and Geodynamics Division; GSA Geochronology Division; GSA
Mineralogy, Geochemistry, Petrology, and Volcanology Division</span></span><span lang="EN-US"><span></span></span></p>





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</div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr">____________________________________<br><br>Andrea Festa<br>Department of Earth Sciences<br>University of Torino<br>Via Valperga Caluso, 35<br>10125 - TORINO (Italy)<br>Phone: - +39-011-670.51.86<br>e-mail: <a href="mailto:andrea.festa@unito.it" target="_blank">andrea.festa@unito.it</a><br>Personal Web Page:<br><a href="https://protect-au.mimecast.com/s/cyI1CYW8NocDG0G2vSGb6Il?domain=andreafesta.magix.net/" target="_blank">http://andreafesta.magix.net/public/</a></div><div dir="ltr">___________________________________<br></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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