Dating the geologic history of Oman’s Semail ophiolite: insights from U-Pb geochronology

Warren, Clare J.; Parrish, Randall R.; Waters, D. J.; Searle, Michael P.

doi:10.1007/s00410-005-0028-5

Cited by 193 publications

(195 citation statements)

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“…Temporal and spatial relations of ophiolites and metamorphic soles have been well-documented in the Oman ophiolite by high-precision U-Pb zircon geochronology and whole rock Nd-isotopic data (Rioux et al, 2013;Warren et al, 2005). Warren et al (2005) reported coeval U-Pb zircon ages for trondhjemites (95.3±0.2 Ma) and for amphibolites (94.48±0.23 Ma), and suggested an SSZ origin for the Semail ophiolite. However, Rioux et al (2013) provided more detailed U-Pb zircon ages and whole rock Nd isotopic data for the crustal rocks and the underlying metamorphic sole and concluded that most of the ophiolitic crust formed at an oceanic spreading center in <1 Ma in the Late Cretaceous, followed by subduction or thrusting that was established below the ophiolite after ≤0.25-0.5 Ma.…”

Section: Discussionmentioning

confidence: 93%

“…The high-grade metamorphism of the metamorphic sole can occur only at the inception of subduction because the hanging wall would subsequently be too cold to cause high-grade metamorphism (Wakabayashi and Dilek, 2003). Temporal and spatial relations of ophiolites and metamorphic soles have been well-documented in the Oman ophiolite by high-precision U-Pb zircon geochronology and whole rock Nd-isotopic data (Rioux et al, 2013;Warren et al, 2005). Warren et al (2005) reported coeval U-Pb zircon ages for trondhjemites (95.3±0.2 Ma) and for amphibolites (94.48±0.23 Ma), and suggested an SSZ origin for the Semail ophiolite.…”

Section: Discussionmentioning

confidence: 99%

“…Different cooling histories of the metamorphic soles and oceanic crustal rocks, as well as different blocking temperatures of zircon U-Pb (~900 o C) and hornblende 40 Ar/ 39 Ar (~550 o C) systems, do not permit compilation of a coherent geochronological record (Hacker and Gnos, 1997;Spray, 1984). Therefore, more high-precision U-Pb geochronological studies on zircons in both magmatic and metamorphic rocks of the Tauride belt ophiolites should be applied to better constrain the temporal relations of the oceanic lithosphere and the metamorphic soles, as has been done in the Oman ophiolite (Rioux et al, 2013;Warren et al, 2005).…”

Section: Discussionmentioning

confidence: 99%

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The tauride ophiolites of Anatolia (Turkey): A review

Parlak¹

2016

J. Earth Sci.

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The Tauride ophiolites lie on the northern and southern flanks of an E-W-trending Tauride carbonate platform. They mainly consist of three tectonic units namely in ascending order, ophiolitic mélange, sub-ophiolitic metamorphic sole and oceanic lithospheric remnants. They were generated above intra-oceanic subduction zones and emplaced over the Tauride carbonate platform from different Neotethyan oceanic basins in the Late Cretaceous. Tauride ophiolites from west to east are described and reviewed. All are underlain by well-preserved dynamothermal metamorphic soles of varied structural thicknesses up to 500 m that have a constant structural position between ophiolitic mélange below and harzburgitic mantle tectonites above and display typical inverted metamorphic sequences from amphibolite facies above to greenschist facies below. The metamorphic soles are shown to have evolved during the initiation of subduction and emplacement processes. In the Pozantı-Karsantı area the contact between the metamorphic sole and the overlying serpentinized harzburgites is characterized by a 1.5-2-m-thick zone of sheared serpentinized harzburgitic mantle intercalated with amphibolites and cut by thick mafic dykes (7-8 m) which postdate intraoceanic metamorphism and high-temperature ductile deformation. This contact is interpreted as an intra-oceanic decoupling surface along which volcanics from the upper levels of the down-going plate were metamorphosed to amphibolite facies and accreted to the base of the hanging wall plate. The metamorphic soles and overlying ophiolitic rocks were intruded by numerous isolated post-metamorphic diabase dykes filled by island arc tholeiitic magma. Subduction initiation and roll-back processes best explain the structural and petrological relationships of Late Cretaceous ophiolite genesis, metamorphic sole formation and subsequent dyke emplacement of the Tauride ophiolites. KEY WORDS: ophiolite, metamorphic sole, dyke emplacement, roll-back, subduction initiation. INTRODUCTIONThe Tauride orogenic belts of Turkey are interpreted as representing a continental fragment that rifted from Gondwana (North Africa) during the Triassic, followed by reamalgamation and continental collision during the OligoMiocene (Karaoğlan et al., 2016) or Miocene (Okay et al., 2010). The Taurides are traditionally divided into three contiguous parts; the western, central and eastern Taurides (Özgül, 1976).Ophiolites along the Tauride belt start with the Lycian nappes to the west and end with the Divriği ophiolite to the east (Fig. 1). These ophiolites (the Lycian nappes, Antalya, Beyşehir-Hoyran nappes, Mersin, Alihoca, Pozantı-Karsantı, Pınarbaşı and Divriği) are situated either on the northern or on the southern flank of an approximately E-W trending Tauride carbonate platform axis (Juteau, 1980 (Juteau, 1980). The plutonic sections and the metamorphic soles of the Tauride ophiolites are cut by numerous isolated microgabbro-diabase and minor pyroxenite dykes at different structural levels (Robertson et al

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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The tauride ophiolites of Anatolia (Turkey): A review

Parlak¹

2016

J. Earth Sci.

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“…Coleman 1981;Boudier et al 1988;Hacker 1991), but these too are controversial (e.g. Searle & Cox 1999;Warren et al 2005Warren et al , 2007Boudier & Nicolas 2007). What is certainly true is that in neither case can the process of the initiation of subduction, which occurred 50 (Izu-Bonin-Marianas) or 90 myr ago (Oman), be observed.…”

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confidence: 99%

The subduction initiation stage of the Wilson cycle

Hall

2018

131

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In the Wilson cycle, there is a change from an opening to a closing ocean when subduction begins. Subduction initiation is commonly identified as a major problem in plate tectonics and is said to be nowhere observable, yet there are many young subduction zones at the west Pacific margins and in eastern Indonesia. Few studies have considered these examples. Banda subduction developed by the eastwards propagation of the Java trench into an oceanic embayment by tearing along a former ocean-continent boundary. The earlier subducted slab provided the driving force to drag down unsubducted oceanic lithosphere. Although this process may be common, it does not account for young subduction zones near Sulawesi at different stages of development. Subduction began there at the edges of ocean basins, not at former spreading centres or transforms. It initiated at a point where there were major differences in elevation between the ocean floor and the adjacent hot, weak and thickened arc/continental crust. The age of the ocean crust appears to be unimportant. A close relationship with extension is marked by the dramatic elevation of land, the exhumation of deep crust and the spectacular subsidence of basins, raising questions about the time required to move from no subduction to active subduction, and how initiation can be identified in the geological record.

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“…Many of these samples have elevated TiO 2 and represent the "outlying" data points in Figure 6.3. Younger plagiogranites (95.5 Ma +/-0.24Ma [Warren et al, 2005]) from the Jebel Fayyad area are a result of fractional crystallization of magma derived from a previously depleted harzburgite mantle [Rollinson, 2009] and are emplaced in a sheeted dike unit and upper pillow lavas. Wadi Hamaliya is chemically different than the previous two and consists of plagiogranite dikes and sills which are very LREE enriched and enriched in fluid mobile elements shown in Figure 6.5 and intrude mantle harzburgites [Rollinson, 2009].…”

Section: Geochemical and Petrologic Comparisons Of Ibm Forearc And Opmentioning

confidence: 99%

A Geochemical Study of Crustal Plutonic Rocks from the Southern Mariana Trench Forearc: Relationship to Volcanic Rocks Erupted during Subduction Initiation

Johnson

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Dating the geologic history of Oman’s Semail ophiolite: insights from U-Pb geochronology

Cited by 193 publications

References 78 publications

The tauride ophiolites of Anatolia (Turkey): A review

The tauride ophiolites of Anatolia (Turkey): A review

The subduction initiation stage of the Wilson cycle

A Geochemical Study of Crustal Plutonic Rocks from the Southern Mariana Trench Forearc: Relationship to Volcanic Rocks Erupted during Subduction Initiation

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