IGGCAS OpenIR  > 岩石圈演化国家重点实验室
Deciphering the Jurassic-Cretaceous evolution of the Hamadan metamorphic complex during Neotethys subduction, western Iran
Monfaredi, Behzad1; Hauzenberger, Christoph1; Neubauer, Franz2; Schulz, Bernhard3; Genser, Johann2; Shakerardakani, Farzaneh4,5; Halama, Ralf6
2020-07-02
Source PublicationINTERNATIONAL JOURNAL OF EARTH SCIENCES
ISSN1437-3254
Pages34
AbstractThe Hamadan high-grade metapelites in the northwestern part of the Sanandaj-Sirjan zone, Iran, show a polymetamorphic evolution with relics of a garnet-bearing metamorphic mineral assemblage (M1), a contact metamorphic overprint (M2) related to the emplacement of the Middle to Late Jurassic Alvand composite pluton and a Buchan-type regional metamorphic event (M3) marked by Ar-40/Ar-39 ages in the 80-70 Ma range that is associated with penetrative ductile deformation producing a foliation and a thermal overprint onto the M2 assemblages. The Ml event is exclusively preserved as small garnet grains and mineral inclusions contained therein, incorporated into M2-stage cordierite porphyroblasts. Distinct metamorphic zones are developed over a region of 600 km(2), which are partly correlated with distance to the composite pluton: zones (1) cordierite + K-feldspar hornfels, and (2) andalusite + cordierite hornfels that surround the Alvand composite pluton at a distance of up to 5 km. These two zones are clearly related to M2 metamorphism associated with pluton emplacement. Zones (3) staurolite schist, (4) andalusite schist, and (5) sillimanite schist are found outside of the contact aureole and are considered to be the result of regional M3 metamorphism in the eastern part distant to the Alvand composite pluton. Conventional thermobarometry shows that temperatures in the area vary between similar to 560 and 660 degrees C for zones 1 and 2 and similar to 490 and 690 degrees C for zones 3-5. Phase equilibria modelling in the MnNCKFMASHT system indicates two distinct isobaric prograde paths at low pressures, at 2.7 kbar for zones 1 and 2 and slightly higher pressures of around 3.5-5.5 kbar for zones 3-5. U-Th-Pb monazite geochronology revealed overlapping ages of 168 +/- 11 Ma and 149 +19 Ma in the hornfels (1 and 2) and schistose (3-5) zones, respectively. These ages are similar to the intrusion age of the Alvand composite pluton (153.3 +/- 2.7 to 166.5 +/- 1.8 Ma) and are interpreted to reflect heating due to the emplacement of the composite pluton (M2 contact metamorphic event). However, Ar-40/Ar-39 dating of white mica and amphibole yielded plateau ages ranging from 80 to 69 Ma over the entire transect. The formation of schistosity in zones 3-5 postdates the intrusion and is thus related to M3 metamorphism. The white mica fabric indicates formation of the foliation during M3 garnet growth, which is followed by local retrogression of garnet to chlorite during exhumation. Consequently, the Ar-40/Ar-39 white mica and amphibole ages likely indicate reheating during M3 to more than ca. 500 +/- 25 degrees C (argon retention temperature in amphibole). These data establish the occurrence of a Cretaceous, Buchan-style regional metamorphic event that had not been firmly identified before. Subsequent Late Cretaceous exhumation of the Hamadan complex with its high-grade metapelites is due to extension along the Tafrijan-Mangavi-Kandelan fault, which represents a major ductile low-angle normal fault. Metamorphic temperatures coupled with mineral ages from this and published work suggest a fast stage of cooling with a rate of similar to 6 degrees C/Ma during exhumation after M3 metamorphism.
KeywordHamadan metamorphic complex Sanandaj-Sirjan zone Thermobarometry (U-Th)-Pb monazite dating Ar-40/Ar-39 dating Petrochronology
DOI10.1007/s00531-020-01893-x
Funding OrganizationUniversity of Graz ; University of Graz ; Afro-Asiatisches Institut Graz ; Afro-Asiatisches Institut Graz ; University of Graz ; University of Graz ; Afro-Asiatisches Institut Graz ; Afro-Asiatisches Institut Graz ; University of Graz ; University of Graz ; Afro-Asiatisches Institut Graz ; Afro-Asiatisches Institut Graz ; University of Graz ; University of Graz ; Afro-Asiatisches Institut Graz ; Afro-Asiatisches Institut Graz
WOS KeywordSANANDAJ-SIRJAN ZONE ; ZIRCON U-PB ; PETROLOGICAL ELEMENTARY TOOLS ; LOW-PRESSURE MIGMATITES ; BALLACHULISH AUREOLE ; TECTONIC EVOLUTION ; CONTACT AUREOLE ; HAMEDAN REGION ; ZAGROS OROGEN ; ICP-MS
Language英语
Funding ProjectUniversity of Graz ; Afro-Asiatisches Institut Graz
Funding OrganizationUniversity of Graz ; University of Graz ; Afro-Asiatisches Institut Graz ; Afro-Asiatisches Institut Graz ; University of Graz ; University of Graz ; Afro-Asiatisches Institut Graz ; Afro-Asiatisches Institut Graz ; University of Graz ; University of Graz ; Afro-Asiatisches Institut Graz ; Afro-Asiatisches Institut Graz ; University of Graz ; University of Graz ; Afro-Asiatisches Institut Graz ; Afro-Asiatisches Institut Graz
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000545072800002
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/97138
Collection岩石圈演化国家重点实验室
Corresponding AuthorMonfaredi, Behzad
Affiliation1.Karl Franzens Univ Graz, Dept Petr & Geochem, NAWI Graz Geoctr, Univ Pl 2, A-8010 Graz, Austria
2.Paris Lodron Univ Salzburg, Dept Geog & Geol, Hellbrunner Str 34, A-5020 Salzburg, Austria
3.Tech Univ Freiberg, Inst Mineral, Brennhausgasse 14, D-09596 Freiberg, Sachsen, Germany
4.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China
5.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
6.Keele Univ, Sch Geog Geol & Environm, Keele ST5 5BG, Staffs, England
Recommended Citation
GB/T 7714
Monfaredi, Behzad,Hauzenberger, Christoph,Neubauer, Franz,et al. Deciphering the Jurassic-Cretaceous evolution of the Hamadan metamorphic complex during Neotethys subduction, western Iran[J]. INTERNATIONAL JOURNAL OF EARTH SCIENCES,2020:34.
APA Monfaredi, Behzad.,Hauzenberger, Christoph.,Neubauer, Franz.,Schulz, Bernhard.,Genser, Johann.,...&Halama, Ralf.(2020).Deciphering the Jurassic-Cretaceous evolution of the Hamadan metamorphic complex during Neotethys subduction, western Iran.INTERNATIONAL JOURNAL OF EARTH SCIENCES,34.
MLA Monfaredi, Behzad,et al."Deciphering the Jurassic-Cretaceous evolution of the Hamadan metamorphic complex during Neotethys subduction, western Iran".INTERNATIONAL JOURNAL OF EARTH SCIENCES (2020):34.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Monfaredi, Behzad]'s Articles
[Hauzenberger, Christoph]'s Articles
[Neubauer, Franz]'s Articles
Baidu academic
Similar articles in Baidu academic
[Monfaredi, Behzad]'s Articles
[Hauzenberger, Christoph]'s Articles
[Neubauer, Franz]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Monfaredi, Behzad]'s Articles
[Hauzenberger, Christoph]'s Articles
[Neubauer, Franz]'s Articles
Terms of Use
No data!
Social Bookmark/Share
Add to CiteULike Add to Connotea Add to Del.icio.us Add to Digg Add to Reddit Add to Technorati
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.