Evidence for polymetamorphic garnet growth in the Çine (southern Menderes) Massif, Western Turkey

Baker, C. B.; Catlos, Elizabeth J.; Sorensen, Sorena S.; Çemen, İbrahi̇m; Hançer, Mete

doi:10.1088/1755-1307/2/1/012020

Cited by 2 publications

(4 citation statements)

References 34 publications

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“…In some cases, the monazite grains contain high amounts of common Pb and did not yield reliable ages. This observation is similar to Menderes Massif monazites reported in Baker et al () and is discussed further in the results section.…”

Section: Methodssupporting

confidence: 92%

“…In general, Çine Massif monazites show elevated amounts of common Pb ( 204 Pb). Low amounts of radiogenic 208 Pb ( 208 Pb*) have been previously reported from Çine Massif monazites (Baker et al, ); this observation has recently been related to monazite Ba content and fluid interactions (Catlos & Miller, ). We include SIMS 137 Ba + /Th + ratios of these monazites from the analyzed spot, which are significantly elevated relative to the standard monazite 137 Ba + /Th + ratio (0.106±0.005 to 2.192±0.049 compared to the average standard value of 2.934×10‐04±1.579×10‐05).…”

Section: Resultsmentioning

confidence: 88%

“…For example, Th‐Pb ages of monazite inclusions in garnet and rock matrix that show crystallization during the Cambro‐Ordovician suggest a garnet‐growth event during that time (Catlos & Çemen, ). Altered garnets characterized by diffusionally modified chemical zoning provide evidence of previous metamorphism not associated with the closure of the Neo‐Tethys Ocean (e.g., Baker et al, ; Candan et al, ; Catlos & Çemen, ; Régnier et al, ; Satır & Taubald, ). Backscattered electron and cathodoluminescence images document garnet zoning in a Çine Massif garnet consistent with polymetamorphism (Baker et al, ).…”

Section: Geological Background and Previous Workmentioning

confidence: 99%

“…Altered garnets characterized by diffusionally modified chemical zoning provide evidence of previous metamorphism not associated with the closure of the Neo‐Tethys Ocean (e.g., Baker et al, ; Candan et al, ; Catlos & Çemen, ; Régnier et al, ; Satır & Taubald, ). Backscattered electron and cathodoluminescence images document garnet zoning in a Çine Massif garnet consistent with polymetamorphism (Baker et al, ). Other observational evidence supporting the polymetamorphism includes relict lenses of high‐temperature granulite within the Çine unit, high‐pressure eclogite blocks, and upper amphibolite facies assemblages suggesting a multistage history (e.g., Candan et al, ; Oberhänsli et al, ).…”

Section: Geological Background and Previous Workmentioning

confidence: 99%

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Implications for Thrust‐Related Shortening Punctuated by Extension From P‐T Paths and Geochronology of Garnet‐Bearing Schists, Southern (Çine) Menderes Massif, SW Turkey

et al. 2019

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The Menderes Massif, Turkey, is a type locality for deciphering the plate tectonic response from collision‐ to extension‐driven exhumation. Conventional thermobarometry and garnet pressure‐temperature (P‐T) paths from isochemical phase diagrams were calculated across a major fault (Selimiye Shear Zone, SSZ) bounding the southern edge of the Menderes Massif. Both approaches yield similar garnet rim temperatures (from 555 to 671 °C), but estimated P differs by between 8 and 15 kbar. Three garnets north of the SSZ reveal N‐shaped P‐T paths, whereas paths from three samples south of the SSZ show a simple increase in P‐T. Monazite and zircon were dated in thin section from the same rocks using Secondary Ion Mass Spectrometry and Laser Ablation Inductively Coupled Plasma‐Mass Spectrometry, respectively. Textural relationships of monazite within garnet appears indicative of post‐garnet growth. The amount of monazite common 204Pb and 137Ba+/Th+ significantly exceeds what is observed for the monazite age standard, suggesting their ages mark fluid‐driven events, loosely constrained to Late Eocene‐Early Miocene. Some zircon ages are consistent with Cambro‐Ordovician ages reported elsewhere in the region, and other ages are Neoproterozoic and Permian‐Triassic, a period not previously recognized in this area. Despite the lack of age constraints for the duration of garnet growth, we present a thermal model to understand the meaning of the N‐shaped path. These paths are best reproduced by thermal models incorporating SSZ thrusting before and after denudation. This paper presents an example of the insight from high‐resolution P‐T paths, and an example of denudation within a prograde metamorphic event.

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Section: Methodssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 88%