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The Sistan suture zone of eastern Iran

1983; Geological Society of America; Volume: 94; Issue: 1 Linguagem: Inglês

10.1130/0016-7606(1983)94 2.0.co;2

1943-2674

R Tirrul, Ian R. Bell, Rebecca Griffis, Victor E. Camp,

High-pressure geophysics and materials

Research Article| January 01, 1983 The Sistan suture zone of eastern Iran R. TIRRUL; R. TIRRUL 1Department of Geological Sciences, University of California at Santa Barbara, Santa Barbara, California 931063Present address: Geological Survey of Canada. 588 Booth Street, Ottawa, Ontario. Canada K1A OE4. Search for other works by this author on: GSW Google Scholar I. R. BELL; I. R. BELL 2Watts, Griffis and McOuat Limited, 159 Bay Street, Suite 911, Toronto, Ontario, Canada M5J 1J7 Search for other works by this author on: GSW Google Scholar R. J. GRIFFIS; R. J. GRIFFIS 2Watts, Griffis and McOuat Limited, 159 Bay Street, Suite 911, Toronto, Ontario, Canada M5J 1J7 Search for other works by this author on: GSW Google Scholar V. E. CAMP V. E. CAMP 2Watts, Griffis and McOuat Limited, 159 Bay Street, Suite 911, Toronto, Ontario, Canada M5J 1J7 Search for other works by this author on: GSW Google Scholar Author and Article Information R. TIRRUL 1Department of Geological Sciences, University of California at Santa Barbara, Santa Barbara, California 931063Present address: Geological Survey of Canada. 588 Booth Street, Ottawa, Ontario. Canada K1A OE4. I. R. BELL 2Watts, Griffis and McOuat Limited, 159 Bay Street, Suite 911, Toronto, Ontario, Canada M5J 1J7 R. J. GRIFFIS 2Watts, Griffis and McOuat Limited, 159 Bay Street, Suite 911, Toronto, Ontario, Canada M5J 1J7 V. E. CAMP 2Watts, Griffis and McOuat Limited, 159 Bay Street, Suite 911, Toronto, Ontario, Canada M5J 1J7 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1983) 94 (1): 134–150. https://doi.org/10.1130/0016-7606(1983)94 2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation R. TIRRUL, I. R. BELL, R. J. GRIFFIS, V. E. CAMP; The Sistan suture zone of eastern Iran. GSA Bulletin 1983;; 94 (1): 134–150. doi: https://doi.org/10.1130/0016-7606(1983)94 2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract A deformed accretionary prism and a flanking forearc basin extending from Birjand southeast to Zahedan, Iran, record the destruction of an arm of the Neo-Tethys during Senonian-Paleocene time and consequent collision of the Afghan and Lut eratonic blocks.The accretionary prism at 32 °N is subdivided into two northwest-trending en echelon belts termed the "Ratuk" and "Neh" complexes, respectively. On the east, the Ratuk complex is characterized by ophiolitic block-against-block or serpentinite-matrix mélange and large fault slivers of epidote blueschist tectonite. The Ratuk complex was built prior to Maastrichtian time. The Neh complex to the southwest is Senonian to Eocene in age and includes, in addition to ophiolitic mélange, weakly metamorphosed marine sedimentary rock exposed in extensive belts bounded by steeply dipping faults.The Sefidabeh forearc basin deposits onlap both the Neh and Ratuk complexes and the southwest margin of the Afghan block. They make up as much as 8 km of Cenomanian to Eocene terrigenous elastics and carbonates that display a complex but coherent stratigraphy. Facies relations demonstrate the uplift and subaerial exposure of the Ratuk structural high, followed by its subsidence contemporaneous with construction of the Neh complex and calc-alkalic volcanism on the northeast (inner) side of the basin.The accretionary prism-forearc basin polarity, the structural vergence and general younging of the accretionary prism to the southwest, as well as the position of the (relatively) high P T metamorphic rock on the inner side of the prism are consistent with northeast-dipping subduction. Widespread emergence of the entire belt and the initiation of folding of the Sefidabeh basin deposits during middle Eocene are interpreted to be consequences of the entry of the Lut block into the subduction zone. Continued convergence of the continental blocks is expressed by a regional system of folds and transcurrent faults corresponding to east-northeast compression. These structures are buried by mildly deformed Miocene volcanic rocks. Extensive post-Miocene right-slip faulting is inferred to be an effect of Miocene "terminal" collision of Arabia and Eurasia. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.