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DOI | 10.1130/B35065.1 |
Subduction initiation and back-arc opening north of Neo-Tethys: Evidence from the Late Cretaceous Torbat-e-Heydarieh ophiolite of NE Iran | |
Moghadam, Hadi Shafaii1; 39;Reilly, S. Y.2 | |
2020-05-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2020 |
卷号 | 132期号:5-6页码:1083-1105 |
文章类型 | Article |
语种 | 英语 |
国家 | Iran; Australia; USA; Egypt; Germany; England; Saudi Arabia; Japan |
英文摘要 | How new subduction zones form is an ongoing scientific question with key implications for our understanding of how this process influences the behavior of the overriding plate. Here we focus on the effects of a Late Cretaceous subduction-initiation (SI) event in Iran and show how SI caused enough extension to open a back-arc basin in NE Iran. The Late Cretaceous Torbat-e-Heydarieh ophiolite (THO) is well exposed as part of the Sabzevar-Torbat-e-Heydarieh ophiolite belt. It is dominated by mantle peridotite, with a thin crustal sequence. The THO mantle sequence consists of harzburgite, clinopyroxene-harz burgite, plagioclase lherzolite, impregnated lherzolite, and dunite. Spinel in THO mantle peridotites show variable Cr# (10-63), similar to both abyssal and fore-arc peridotites. The igneous rocks (gabbros and dikes intruding mantle peridotite, pillowed and massive lavas, amphibole gabbros, plagiogranites and associated diorites, and diabase dikes) display rare earth element patterns similar to MORB, arc tholeiite and back-arc basin basalt. Zircons from six samples, including plagiogranites and dikes within mantle peridotite, yield U-Pb ages of ca. 99-92 Ma, indicating that the THO formed during the Late Cretaceous and was magmatically active for similar to 7 m.y. THO igneous rocks have variable epsilon Nd(t) of +5.7 to +8.2 and epsilon Hf(t) ranging from +14.9 to +21.5; zircons have epsilon Hf(t) of +8.1 to +18.5. These isotopic compositions indicate that the THO rocks were derived from an isotopically depleted mantle source similar to that of the Indian Ocean, which was slightly affected by the recycling of subducted sediments. We conclude that the THO and other Sabzevar-Torbat-e-Heydarieh ophiolites formed in a back-arc basin well to the north of the Late Cretaceous fore-arc, now represented by the Zagros ophiolites, testifying that a broad region of Iran was affected by upper-plate extension accompanying Late Cretaceous subduction initiation. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000530917400014 |
WOS关键词 | ZIRCON U-PB ; REGION CENTRAL IRAN ; SISTAN SUTURE ZONE ; ISLAND-ARC ; GEODYNAMIC EVOLUTION ; SABZEVAR OPHIOLITE ; TECTONIC EVOLUTION ; GEOCHEMICAL CONSTRAINTS ; NEOTETHYAN SUBDUCTION ; OCEANIC LITHOSPHERE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/279452 |
专题 | 地球科学 |
作者单位 | 1.Damghan Univ, Sch Earth Sci, Damghan 3671641167, Iran; 2.Macquarie Univ, Dept Earth & Planetary Sci, ARC Ctr Excellence Core Crust Fluid Syst, N Ryde, NSW 2109, Australia; 3.Macquarie Univ, Dept Earth & Planetary Sci, GEMOC ARC Natl Key Ctr, N Ryde, NSW 2109, Australia; 4.Univ Texas Dallas, Geosci Dept, Richardson, TX 75083 USA; 5.Kafrelsheikh Univ, Fac Sci, Dept Geol, Kafr Al Sheikh 33516, Egypt; 6.Leibniz Univ Hannover, Inst Mineral, Hannover, Germany; 7.Univ Cologne, Cologne 50674, Germany; 8.Univ Bonn, Steinmann Inst, Bonn, Germany; 9.Univ Durham, Northern Ctr Isotop & Elemental Tracing, Dept Earth Sci, Durham DH1 3LE, England; 10.King Fahd Univ Petr & Minerals, Dept Geosci, Dhahran 31261, Saudi Arabia; 11.Japan Agcy Marine Earth Sci & Technol JAMSTEC, Dept Solid Earth Geochem, Natsushima Cho 2-15, Yokosuka, Kanagawa 2370061, Japan; 12.Kanazawa Univ, Dept Earth Sci, Kanazawa, Ishikawa 9201192, Japan |
推荐引用方式 GB/T 7714 | Moghadam, Hadi Shafaii,39;Reilly, S. Y.. Subduction initiation and back-arc opening north of Neo-Tethys: Evidence from the Late Cretaceous Torbat-e-Heydarieh ophiolite of NE Iran[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2020,132(5-6):1083-1105. |
APA | Moghadam, Hadi Shafaii,&39;Reilly, S. Y..(2020).Subduction initiation and back-arc opening north of Neo-Tethys: Evidence from the Late Cretaceous Torbat-e-Heydarieh ophiolite of NE Iran.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,132(5-6),1083-1105. |
MLA | Moghadam, Hadi Shafaii,et al."Subduction initiation and back-arc opening north of Neo-Tethys: Evidence from the Late Cretaceous Torbat-e-Heydarieh ophiolite of NE Iran".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 132.5-6(2020):1083-1105. |
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