首页|Constraining the timing of Arabia-Eurasia collision in the Zagros orogen by sandstone provenance(Neyriz,Iran)

Constraining the timing of Arabia-Eurasia collision in the Zagros orogen by sandstone provenance(Neyriz,Iran)

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The Zagros orogen,formed by the collision of the Arabian and Eurasian continental margins,represents one of the largest and richest oil and gas provinces in the world.The Zagros fold-thrust belt records collision and convergence along the Neotethys suture z one.By coupling field observations,sandstone modal analysis,U-Pb zircon dating,and Hf isotopic data from the Upper Cretaceous to Pliocene sedimentary succession of the Neyriz region,this paper documents several major provenance changes that allow us to propose a refined scenario for the Zagros orogeny.An ophiolitic complex ciated by detrital-zircon U-Pb geochronol-ogy as ca.95 Ma provided detritus to Upper Cretaceous-Paleocene strata deposited along the northeastern margin of the Arabian lower plate(ophiolite provenance).Yet,on the southwestern margin of the Eurasian upper plate,upper Paleocene-lower Eocene strata indicate provenance from Mesozoic magmatic rocks yielding zircons dated as ca.140 Ma and 170 Ma as well as the recycling of clastic rocks.Since the early Miocene,the sedimentary basin located on the Arabian plate received both ophiolitic detritus and magmatic-arc,recycled clastic,and axial-belt metamorphic detritus from Eurasia.U-Pb ages of detrital zircons reflect polyphase mag-r latism at 170 Ma,95 Ma,and 40 Ma on the Eurasian active margin.Our results indicate that progressive accretion,uplift,and exhumation of the Zagros orogen was well under way by the beginning of the Miocene in the Neyriz region.Literature data from adjacent regions suggest that the Arabia/Eurasia collision may have occurred diachronously and later in the Kermanshah and Lurestan areas to the north.

Farisa GholamiZadeh、Xiumian Hu、Eduardo Garzanti

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Department of Paleo-environment,Geological Survey of Iran,Meraj Blvd.,Azadi Sq.,Tehran 1387835841,Iran

School of Earth Sciences and Engineering,Nanjing University,Xianlindadao 163,Nanjing 210023,PR.China

Laboratory of Provenance Studies,Dipartimento di Scienze dell'Ambiente e della Terra Universita'di Milano-Bicocca,Piazza della Scienza 4,20126 Milano,Italy

2022

10.1130/B35950.1

Geological Society of America Bulletin

Geological Society of America Bulletin

SCI
ISSN：0016-7606
年,卷(期)：2022.134(7/8)
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