Discussion on “Dextral transpression in Late Cretaceous continental collision, Sanandaj–Sirjan Zone, western Iran”

Numan, Nazar M. S.

doi:10.1016/s0191-8141(01)00075-x

Cited by 21 publications

(11 citation statements)

References 4 publications

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“…have occurred during Eocene (Numan, 1997(Numan, , 2001Numan & Al-Azzawi, 2002;Al-Qayim, 2000); Eocene-Oligocene (Hempton, 1987;Beydoun, Hughes Clarke & Stoneley, 1992;Hooper et al 1994); Oligocene-Miocene (Koop & Stoneley, 1982); Late Miocene (McQuarrie et al 2003;Stoneley, 1981); and Early Pliocene (Falcon, 1969) times. More recently, on the basis of magnetostratigraphic studies, Homke et al (2004) investigated the timing and duration of the growth of the frontal folds of the Pusht-e Kuh arc in Lurestan Province, Iran, and concluded that if the deformation migrated following a foreland sequence, the deformation in the hinterland of the Simply Folded Belt must have started before 8.1-7.2 Ma and well before the generally accepted Late Pliocene maximum folding phase (Haynes & McQuillan, 1974;Stöcklin, 1968;Hamzepour, Paul & Wiesner, 1999 (Takin, 1972;Stöcklin, 1977); and (3) convergence and collision of the Afro-Arabian and Iranian plates in Late Maastrichtian time (Berberian & King, 1981).…”

Section: A Timing Of Deformationmentioning

confidence: 99%

Significance of angular unconformities between Cretaceous and Tertiary strata in the northwestern segment of the Zagros fold–thrust belt, Kurdistan Region, NE Iraq

et al. 2011

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-In this study, two angular unconformities are found and analysed for the first time in the Mesozoic-Cenozoic succession in the northwestern segment of the Zagros fold-thrust belt (ZFTB) in the Kurdistan Region. The first unconformity exists between Lower Cretaceous and PaleoceneEocene rocks and the second between the Campanian Shiranish Formation and the Maastrichtian Tanjero Formation. Each of these unconformities is found in two different localities in the Zagros Imbricate Zone (i.e. the highly deformed zone immediately SW of the Zagros Suture) of the ZFTB of the Kurdistan Region near the border with Iran. The study uses recent geological mapping, structural and stratigraphic analyses in addition to using previous biozonation of the stratigraphic units that bound the two unconformities. The first unconformity was initiated with obduction of the ophiolite and Lower Cretaceous radiolarite onto the passive margin of the Arabian plate. This unconformity formed during an early phase of the Zagros orogeny, which is associated with the developing of a foreland basin, and resulted in the folding of the radiolarites and their uplift to form high-relief land. The erosion of this high-relief land resulted in the formation of the Paleocene-Eocene Red Bed Series and their deposition on the folded radiolarite. The timing of the deformation that caused this unconformity is hard to determine; however, its stratigraphic position may suggest that it possibly is related to post-Cenomanian movements. The second unconformity is between the tilted Campanian Shiranish Formation (hemipelagite) and Tanjero Formation (500 m of conglomerate in the more proximal area). These unconformities indicate that deformation and uplift of the sedimentary units was variable during ophiolite obduction in this part of the ZFTB. We argue that deformation, ophiolite obduction and collision are likely to have varied in space and time along the c. 2000 km long ZFTB.

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Section: A Timing Of Deformationmentioning

confidence: 99%

Significance of angular unconformities between Cretaceous and Tertiary strata in the northwestern segment of the Zagros fold–thrust belt, Kurdistan Region, NE Iraq

et al. 2011

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“…6). Thereafter, by initiation of three radial fractures, three arms of the Neotethys Basin formed (Numan 2001;Lapierre et al 2004;Chauvet et al 2009). The joining of these three arms formed the Neotethys triple junction.…”

Section: Triple Junction Formation Stage (Late Silurian-early Carbonimentioning

confidence: 99%

Tectonic evolution of the Zagros Orogen in the realm of the Neotethys between the Central Iran and Arabian Plates: An ophiolite perspective

Ajirlu

Moazzen

Hajialioghli

2016

Central European Geology

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“…The ascent of slab-derived fluids could be due to dehydration reactions and sediment pore-water expelled from subducted sediments, along with porosity reduction in the upper oceanic crust, resulting in the serpentinization of upper mantle rock in forearc. This inference is supported by the association of serpentinite with the spilite and andesite of the Walash volcanic arc rocks related to a Paleocene-Eocene magmatic arc (Numan 2001).The serpentinization process of peridotite along the N W-ZTZ has both criteria of isochemical and allochemical processes. The formation of metasomatic rocks rodingite and albitite within the serpentinite bodies involves loss and gain of CaO, SiO 2 , and Na 2 O between sepentinized peridotite and country rock (Mohammad et al 2007;Mohammad and Maekawa 2008).…”

Section: Discussionmentioning

confidence: 95%

Serpentinites and their tectonic signature along the Northwest Zagros Thrust Zone, Kurdistan Region, Iraq

Mohammad

2009

Arab J Geosci

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Two types of serpentinized peridotites are distinguished within the Northwest Zagros Thrust Zone (NW-ZTZ) in Kurdistan region of Iraq. One is found as lower members of ophiolite sequences, such as the Mawat and Penjwin ophiolites of the upper Cretaceous age. The other is represented by intraformational isolated serpentinite bodies in Betwat, Qaladeza, and Qalander areas within the Walash-Naopurdan volcano-sedimentary unit of the Paleocene to Eocene paleo-arc tectonic setting. Serpentinites within the NW-ZTZ consist mainly of lizardite and chrysotile, with subordinate amounts of syn-serpentinization magnetite, carbonates, chromium chlorite, tremolite, and talc as secondary minerals, and olivine, clinopyroxene, and chromian spinel as primary minerals. Minor antigorite is also found in the sheared serpentinites often found in ophiolite sequences. Petrological and geochemical studies of serpentinites from the NW-ZTZ show that, of the original protoliths of serpentinites, those associated with ophiolites are residual depleted harzburgite and dunite. The Cr# ¼ Cr= ð Cr þ Al ð Þ atomicratio: Cr þ Al ð Þ atomicratioÞ of chromian spinel is more than 0.6, and the forsterite content of olivine is 91-92. On the other hand, the original protolith of isolated serpentinite bodies is less depleted harzburgite or depleted lherzolite, which has spinel with Cr# less than 0.6 and olivine with 90-91 forsterite contents. Whole rock chemistry of major, trace, and rare earth elements shows that the serpentinites of ophiolite sequences are depleted in CaO, Al 2 O 3 , and SiO 2 , Sr, and Zr, and are enriched in MgO, Ni, and Cr, in comparison with the isolated serpentinites. Cr# of the disseminated unaltered chromian spinels indicates that the serpentinites of both types had been originated from the supra-subduction zone tectonic setting; the serpentinites of ophiolite sequences obducted and thrusted over the continental margin during the obduction of the Tethyth oceanic crust onto the Arabian continental margin during the upper Cretaceous period. Isolated serpentinite bodies represent serpentinized forearc mantle wedge peridotites emplaced by diapiric upwelling into non-accretionary forearc tectonic settings during the Paleocene to Eocene age.

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Discussion on “Dextral transpression in Late Cretaceous continental collision, Sanandaj–Sirjan Zone, western Iran”

Cited by 21 publications

References 4 publications

Significance of angular unconformities between Cretaceous and Tertiary strata in the northwestern segment of the Zagros fold–thrust belt, Kurdistan Region, NE Iraq

Significance of angular unconformities between Cretaceous and Tertiary strata in the northwestern segment of the Zagros fold–thrust belt, Kurdistan Region, NE Iraq

Tectonic evolution of the Zagros Orogen in the realm of the Neotethys between the Central Iran and Arabian Plates: An ophiolite perspective

Serpentinites and their tectonic signature along the Northwest Zagros Thrust Zone, Kurdistan Region, Iraq

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