Mineral chemistry, crystallization conditions and geodynamic implications of the Oligo–Miocene granitoids in the Biga Peninsula, Northwest Turkey

Aysal, Namık

doi:10.1016/j.jseaes.2015.03.026

Cited by 37 publications

(24 citation statements)

References 66 publications

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“…Miocene aged horst-graben structures and associated calc-alkaline and alkaline magmatism occur especially in Western Anatolia (Altunkaynak et al, 2012a;Altunkaynak et al, 2012b, Okay andSatır, 2006). REE-bearing fluorite deposits in this area are associated with Paleocene to Miocene carbonatite to alkaline magmatism, related to retreat and roll-back of the Hellenic arc (Aysal, 2015).…”

Section: Introductionmentioning

confidence: 86%

Rare earth element-bearing fluorite deposits of Turkey: An overview

Öztürk

Altuncu

Hanilçi

et al. 2019

Ore Geology Reviews

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Rare Earth Element (REE)-bearing fluorite deposits in Turkey occur in association with Cenozoic post-collisional alkaline-carbonatite systems and can be divided into three groups: (1) carbonatite-associated; (2) those associated with subalkaline to alkaline magmatic rocks of Cretaceous to Cenozoic age; and (3) those in sedimentary successions, typically in areas dominated by limestone. Some of these deposits show significant enrichment in the REE, especially the Kızılcaören deposit which has average REE grades of almost 30,000 ppm; others have very low REE contents but have potential fluorite resources. The homogenization temperature and salinity values of fluid inclusions in these deposits vary between 600°C to 150 °C, and 10-65 wt.% NaCl eq., respectively. The carbonatite-associated deposits have the highest bulk REE contents and are LREEenriched. As a general feature, the REE contents of the fluorite deposits decrease with decreasing homogenization temperatures and salinity of the fluorite fluid inclusions. Fluorite ore chemistry indicates that a plot of Nb+Ta versus total REE differentiates the carbonatite-hosted from the alkali intrusive-hosted and carbonate-hosted deposits. Beyond the cooling and/or dilution of the fluids, REE and fluorite deposition was driven by changes in pH, instead of change in Eh, according to our geostatistical treatment. The chondrite-normalized rare earth element patterns of each group of deposits show some similar features, indicating that the REE in the fluorite are independent of their host 2 lithology, but reflect the magmatic systems from which they were derived. Overall, the FREE deposits of the Anatolides-Taurides in Turkey are considered to be largely related to the post-collisional magmatic systems, but with variable contributions of fluids from other sources.

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Section: Introductionmentioning

confidence: 86%

Rare earth element-bearing fluorite deposits of Turkey: An overview

Öztürk

Altuncu

Hanilçi

et al. 2019

Ore Geology Reviews

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“…Barometry based on the chemical composition of the amphiboles was proposed by the equations of Hammarstrom and Zen (1986), Schmidt (1992), and Ridolfi et al (2010). The last equation was initially used for volcanic rocks, but the validity of the application of this method for intrusive rocks was also confirmed by Aysal (2015). In this method, amphibole should be derived from calc-alkaline magmas with Al# (Al# = Al VI /Al tot ) of <0.21 and Mg/(Mg + Fe 2+ ) of >0.5.…”

Section: Granitoidsmentioning

confidence: 99%

Petrological characteristics of the Middle Eocene Toveireh pluton (southwest of Jandaq, central Iran): implications for the eastern branch of the Neo-Tethys subduction

Sargazi¹,

Torabi²,

Morishita³

2019

Turkish J Earth Sci

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The Middle Eocene Toveireh plutonic body is located in the western margin of the Central-East Iranian Microcontinent (CEIM). This plutonic body consists of granodiorite, syenogranite, and monzogranite compositions. Granodiorite is the most predominant rock unit, which is composed of quartz, plagioclase, K-feldspar, hornblende, and biotite main mineral phases. The Toveireh pluton is metaluminous to weakly peraluminous (A/CNK = 0.85-1.04) and shows a calc-alkaline I-type affinity. Primitive mantle-normalized spidergrams show enrichment of large ion lithophile elements (Rb, Ba, Th, U) and light rare earth elements (REEs) (La/Yb N = 6.8-8.24), as well as depletion of high-field strength elements (Nb, Ta, Ti, P). These rocks are characterized by unfractionated heavy REEs [(Gd/Yb) N = 1.02-1.80] and a moderate negative Eu anomaly (Eu/Eu* = 0.39-0.77) in the chondrite-normalized REE patterns. The geochemical data suggest that the Toveireh pluton was derived from a low degree of partial melting of a mixed source, primarily of mafic and metasedimentary rock, in the middle crust by underplating of mafic magma. Geochemical and petrological features of the studied samples, such as a wide range of Mg# values (21.3-62.2, average: 35.6) and low amounts of mafic microgranular enclaves, indicated minor involvement of the mantle-derived magma components in the source and about 10% mixing with a felsic melt. Magma chamber processes, including melting, assimilation, storage and homogenization, magma mixing, and assimilation and fractional crystallization, played an important role in the magmatic evolution. The hornblende thermobarometry yielded 720 °C to 840 °C ± 23.5 °C and 0.6-1.4 ± 0.16 kbar for the granodiorites, and the biotite thermobarometry revealed 700 °C to 750 °C and 0.77-0.78 kbar for the syenogranites. The combined results suggest that the studied rocks were crystallized in shallow crustal magma chambers. The Toveireh pluton was formed by the subduction of the eastern branch of Neo-Tethyan oceanic crust beneath the CEIM during the Late Triassic to Early Tertiary.

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“…The study area contains, volcanic units of Tertiary magmatism, volcanosedimentary sequences and granitoids (Altunkaynak et al, 2012;Aysal, 2015 (Karacık et al, 2008;Aysal et al, 2012b). In the Biga Peninsula, mainly closed basins developed under control of active faults with terrestrial sediments and/ or lacustrine carbonate rocks deposited in fl uvial or lake environments.…”

Section: Geology Of Yenice-gönen Fault and Surroundingsmentioning

confidence: 99%

ACTIVE TECTONIC AND PALEOSEISMOLOGIC CHARACTERISTICS OF THE YENİCE-GÖNEN FAULT, NW TURKEY, IN LIGHT OF THE 18 MARCH 1953 YENİCE-GÖNEN EARTHQUAKE (Ms=7.2)

Kürçer¹,

Özalp²,

Güldoğan³

et al. 2018

Bulletin of the Mineral Research and Exploration

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The Yenice-Gönen Fault (YGF) is located in the central part of the Biga Peninsula between Gönen and Yenice and is a right-lateral strike-slip active fault with general trending N65°E. On 18 March 1953 there was an earthquake on the YGF that died 263 people (Ms=7.2) and a 70 km surface rupture developed during this earthquake. In this study measurements of slip distribution were performed on the surface rupture of the Yenice-Gönen Earthquake (YGE) and the annual slip rate on the YGF was calculated. Right-lateral displacements of between 1.70±0.1 and 3.20±0.2 metres were measured on the surface rupture of the YGE. The maximum displacements were in an area close to the central part of the YGF (between Çakır and Karaköy village) and these values decreased relatively in NE and SW directions, documenting that was the bilaterally surface rupture propogation during the YGE. In the last 300.000 years, a total offset of 800±50 metres was measured on Gönen River and annual slip rate of 2.65±0.15 mm was calculated along the YGF. Current GPS studies show right-lateral strike-slip faults in the South Marmara region have slip rates of 6-8 mm/year. This slip rate is assessed as being partitioned between the YGF, Sarıköy Fault and Çan-Biga Fault zones which represent extensions of the North Anatolian Fault system within the South Marmara region. Paleoseismology studies determined that in the last 6200 years 6 earthquakes resulting in surface ruptures have occurred on the YGF, including the 1953 earthquake. According to the 14 C and OSL dating results, the variable and irregular earthquake recurrence interval of YGF is ranging from 505 to 1793 years. In this study average earthquake recurrence interval of YGF was determined as 1180 years.

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Mineral chemistry, crystallization conditions and geodynamic implications of the Oligo–Miocene granitoids in the Biga Peninsula, Northwest Turkey

Cited by 37 publications

References 66 publications

Rare earth element-bearing fluorite deposits of Turkey: An overview

Rare earth element-bearing fluorite deposits of Turkey: An overview

Petrological characteristics of the Middle Eocene Toveireh pluton (southwest of Jandaq, central Iran): implications for the eastern branch of the Neo-Tethys subduction

ACTIVE TECTONIC AND PALEOSEISMOLOGIC CHARACTERISTICS OF THE YENİCE-GÖNEN FAULT, NW TURKEY, IN LIGHT OF THE 18 MARCH 1953 YENİCE-GÖNEN EARTHQUAKE (Ms=7.2)

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