The barite deposits that emerge as veins and lodes within or along the contact zones of recrystallized limestone and dolomite units of Cambrian Degirmentas Formation are of epigenetic character. Depositional styles, mineral paragenesis, host rock alteration styles, and high SrO contents of the barites suggest a hydrothermal origin for their formation. However, considering their rare earth element compositions, barite samples surround the field for seawaters when plotted on CeN/YbN–YbN and CeN/SmN–CeN/YbN diagrams. Fluid inclusion data obtained from the barites indicated a formation from a fluid with low salinity (0.9–1.6 wt.% NaCl eq.) at homogenization temperatures between 78 and 190 °C. Sulfur isotopic compositions of barites vary between +32.2 and +36.3‰, and their 87Sr/86Sr values range between 0.709885 and 0.749652. Depositional styles, mineral assemblage, trace element compositions, fluid inclusion data as well as δ34S and 87Sr/86Sr isotopic data indicate a model in which hydrothermal fluids were possibly derived from a buried intrusion mixed with meteoric and marine waters, further interacting with the Precambrian–Phanerozoic metaclastic and Cambrian carbonate rocks to form barite deposits.
Öz: Orta Toroslar'da karbonatlı kayaçlar ile ilişkili Zn-Pb yatakları ile barit ve florit zenginleşmeleri bulunur. Florite ait Nadir Toprak Elementleri (NTE) kökensel yorumlamada kullanılır. Orta Toroslarda yer alması ve bölgeye yakın alanlarda da florit oluşumlarına rastlanılması sebebiyle Sarıveliler floritinin oluşumunun ortaya konulması önem arz eder. Bu çalışmanın amacı floritin oluşumu ve NTE jeokimyasının ortaya konularak diğer yataklar ile karşılaştırılmasıdır. Sarıveliler ilçesi batısında Aladağ Birliğine ait Erken-Orta Triyas yaşlı kireçtaşları florit içerir. Damar tipi şeklinde ve epijenetik oluşumlu cevherleşmede parajenez florit, galenit, kuvars ve kalsitten oluşur. Sarıveliler floritlerinin NTE jeokimyası, floritlerin NTE bakımından fakir olduğunu gösterir. Floritler, kireçtaşları içerisinde gelişmiş kırık ve çatlaklarda hidrotermal evrede oluşmuştur. Düşük Y oranları, cevherleşmede formasyon sularının etkin olduğunun göstergesidir. Cevher oluşumunda ortam düşük sıcaklık ve yüksek oksijen fugasitesine sahiptir. Sarıveliler floritleri (Tb/Yb)n-(La/Yb)n diyagramında New Mexico kristalize alanında, (La/Yb)n-(Eu/Eu*)n ve Sr-(Eu/Eu*)n diyagramlarında Büyükkızılcık floritlerine benzer alanda, Sc/Eu-Sr diyagramında Akdağmadeni floritleri alanında ve Sc-∑REE diyagramında ise ağır metaller alanında dağılım göstermektedir.
The Pohrenk fluorite mineralisation which makes up Central Anatolia's most extensive fluorite region is Lutetian aged, and hosted in carbonate rocks that have undergone occasional karstification and silicification along a N-S fault trend. Fluid inclusion values and the position of fluorites in the Tb/La-Tb/Ca diagram show that mineralisation occurred in a hydrothermal environment with homogenisation temperatures ranging from 78.1-363°C. The presence of fluorite as a space filler in carbonate rocks and its association with silicification indicates that the solutions contained considerable amounts of Si alongside F (fluorine). The Pohrenk fluorite samples have 143 Nd/ 144 Nd values of between 0.512349 and 0.512497, whilst 87 Sr/ 86 Sr values vary between 0.708161 and 0.708772. These values indicate a mantle origin where continental contamination could occur. When the Nd-Sr values are compared to magmatic and young volcanics, the Pohrenk fluorites are seen to be enriched and exhibit similar isotopic signatures to Upper Cretaceous aged magmatics, Early-Middle Miocene volcanics and Mio-Quaternary volcanics.
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