Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Geochemical characteristics of mafic lavas from the Neotethyan ophiolites in western Turkey: implications for heterogeneous source contribution during variable stages of ocean crust generation
Download
index.pdf
Date
2008-01-01
Author
ALDANMAZ, ERCAN
Yaliniz, M. K.
GÜÇTEKİN, AYKUT
Göncüoğlu, Mehmet Cemal
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
293
views
0
downloads
Cite This
The Late Triassic to Late Cretaceous age mafic lavas from the Neotethyan suture zone ophiolites in western Turkey exhibit a wide diversity of geochemical signatures, indicating derivation from extremely heterogeneous mantle sources. The rocks as a whole can be divided into three broad subdivisions based on their bulk-rock geochemical characteristics: (1) mid-ocean ridge basalts (MORB) that range in composition from light rare earth element (LREE)-depleted varieties (N-MORB; (La/Sm)(N) < 1) through transitional MORB to LREE enriched types (E-MORB; (La/SM)(N) > 1); (2) the ocean island basalt (OIB)-type alkaline volcanic rocks with significant enrichment in LILE, HFSE and L-MREE, and a slight depletion in HREE, relative to normal mid-ocean ridge basalts (N-MORB); and (3) the supra-subduction zone (SSZ)-type tholeiites originated from arc mantle sources that are characterized by selective enrichments in fluid-soluble large ion lithophile elements (LILE) and LREE relative to the high field strength elements (HFSE). The formation of MORB tholeiites with variable enrichments and depletions in incompatible trace elements is probably related to the processes of crust generation along an oceanic spreading system, and the observed MORB-OIB associations can be modelled by heterogeneous source contribution and mixing of melts from chemically discrete sources from sub-lithospheric reservoirs. Evaluation of trace element systematics shows that the inferred heterogeneities within the mantle source regions are likely to have originated from continuous processes of formation and destruction of enriched mantle domains by long-term plate recycling, convective mixing and melt extraction. The origin of SSZ-type tholeiites with back-arc basin affinities, on the other hand, can be attributed to the later intra-oceanic subduction and plate convergence which led to the generation of supra-subduction -type oceanic crust as a consequence of imparting a certain extent of subduction component into the mantle melting region. Mixing of melts from a multiply depleted mantle source, which subsequently received variable re-enrichment with a subduction component, is suggested to explain the generation of supra-subduction-type oceanic crust. The geodynamic setting in which much of the SSZ-type ophiolitic extrusive rocks from western Turkey were generated can be described as an arc-basin system that is characterized by an oceanic lithosphere generation most probably associated with melting of mantle material along a supra-subduction-type spreading centre.
Subject Keywords
MORB heterogeneity
,
Mid-plate basalts
,
Back-arc basin basalts
,
Neotethyan ophiolites
,
Western Turkey
,
Mantle heterogeneity
URI
https://hdl.handle.net/11511/31440
Journal
GEOLOGICAL MAGAZINE
DOI
https://doi.org/10.1017/s0016756807003986
Collections
Graduate School of Natural and Applied Sciences, Article
Suggestions
OpenMETU
Core
Geodynamic significance of the Cretaceous pillow basalts from North Anatolian Ophiolitic Melange Belt (Central Anatolia, Turkey): geochemical and paleontological constraints
Rojay, Fuat Bora; Altiner, SO; Onen, AP; James, S; Thirlwall, MF (2004-09-01)
The most widespread blocks within the Cretaceous ophiolitic melange (North Anatolian ophiolitic melange) in Central Anatolia (Turkey) are pillow basalts, radiolarites, other ophiolitic fragments and Jurassic-Cretaceous carbonate blocks. The pillow basalts crop out as discrete blocks in close relation to radiolarites and ophiolitic units in Cretaceous ophiolitic melange. The geochemical results suggest that analyzed pillow basalts are within-plate ocean island alkali basalts. The enrichment of incompatible ...
Geochemistry of mafic rocks of the Karakaya complex, Turkey: evidence for plume-involvement in the Palaeotethyan extensional regime during the Middle and Late Triassic
Sayıt, Kaan; Göncüoğlu, Mehmet Cemal (2009-03-01)
The Karakaya Complex within the Early Mesozoic Cimmerian Orogeny in northern Turkey represents the remnants of the Palaeotethys. It includes slivers and/or mega-blocks of slightly metamorphic basic volcanic rocks associated with fossiliferous sediments as well as hypabyssal and intrusive rocks with basaltic-andesitic to ultramafic compositions. They display two distinct compositional groups; namely alkaline and variably tholeiitic. The alkaline basalt samples are more akin to oceanic-island basalts (OIB) wi...
Geochemistry and Tectonic Implications of Leucogranites and Tourmalines of the Southern Menderes Massif, Southwest Turkey
Bozkurt, Erdin; Mittwede, Steven K.; Ottley, Christopher J. (Informa UK Limited, 2006-10)
Granitoid rocks of the southern Menderes Massif, SW Turkey include widespread possibly Ediacaran high-grade granitic orthogneisses and younger (Tertiary) sheets, sills and/or dikes of variably deformed tourmaline-bearing leucogranites. The latter are confined to the immediate footwall of the regional-scale ductile southern Menderes shear zone. Although both sets of granitoid rocks are essentially calc-alkaline and peraluminous, the syn- to post-collisional tourmaline-bearing leucogranites are chemically dis...
Geochemistry and Zircon U-Pb Dates of Felsic-Intermediate Members of the Late Cretaceous Yuksekova Arc Basin: Constraints on the Evolution of the Bitlis-Zagros Branch of Neotethys (Elazig, E Turkey)
Ural, Melek; Sayıt, Kaan; KORALAY, OSMAN ERSİN; Göncüoğlu, Mehmet Cemal (2021-08-01)
During the Late Cretaceous in the Eastern Mediterranean, the northern branch of the southern Neotethys was closed by multiple northward subductions. Of these, the most northerly located subduction created the Baskil continental arc at around 82-84 Ma. The more southerly and intra-oceanic subduction, on the other hand, produced an arc-basin system, the Yuksekova Complex, as early as the late Cenomanian-early Turonian. The abundant and relatively well-studied basaltic rocks of this complex were intruded by dy...
Extinction, survival, and recovery of lagenide foraminifers in the permian-triassic boundary interval, central Taurides, Turkey
Groves, JR; Altıner, Demir; Rettori, R (2005-07-01)
The assemblage of lagenide foraminifers in uppermost Permian rocks of the central Taurides consists of 22 species ill 16 genera. including the new species Rectostipulina pentamerata, plus additional unidentified elements. Of these, only two identifiable species in "Nodosaria" and indeterminate syzraniids survived the end-Permian mass extinction. The last occurrences of most taxa fall within the upper half-meter of the Permian System, a pattern consistent with abrupt extinction when tested for the Signor-Lip...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
E. ALDANMAZ, M. K. Yaliniz, A. GÜÇTEKİN, and M. C. Göncüoğlu, “Geochemical characteristics of mafic lavas from the Neotethyan ophiolites in western Turkey: implications for heterogeneous source contribution during variable stages of ocean crust generation,”
GEOLOGICAL MAGAZINE
, pp. 37–54, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31440.