Comparison with carbonate rocks hosted iron skarn in the eastern Sakarya Zone (Gümüşhane, NE Turkey): a geomorphologic, geochemical and stable isotopic approach

IF 1.1 4区 地球科学 Q3 GEOLOGY
Ferkan Sipahi, Halil İbrahim Zeybek, Mehmet Ali Gücer, Fatih Işık
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引用次数: 0

Abstract

The carbonate rocks in the eastern part of NE Turkey are situated within the Pontide paleo-magmatic arc and are frequently in contact with granitoid formations, often hosting skarn mineralization in the region. These carbonate rocks, typically found on ridges and hillsides exhibit predominant orientations along east–west, northeast-southwest, and northwest-southeast directions. A part of limestone, named as biomicrite, metamorphosed and display a saccharoidal texture. Comprised mainly of calcite, with less secondary quartz and iron oxide minerals, these carbonate rocks are classified as Fe-poor calcio-carbonate and magnesio-carbonate, having higher CaO and LOI contents. Marble and recrystallized limestone with granoblastic texture mainly comprise of calcite, less quartz, magnetite, and hematite. Marble classification diagrams suggest calcic skarn mineralization, indicated by decreasing CaO (or CO2) and increasing MgO from limestone to marble (or skarn). Strontium contents deviate slightly from the lithosphere carbonate average, while low Rb contents, attributed to skarn metamorphism, indicate the absence of K-bearing minerals. The high Al2O3/SiO2 in the carbonate rocks can points out hydrothermal activity and carbonate disengagement can indicate to actualize at temperatures that can affect Ce and Al mobilities. The low authigenic U value, low U/Th and Ni/Co ratios in carbonate rocks have been implied that protolith constituents deposited under oxic conditions. Positive Eu anomalies in limestone and marble suggest the influence of hydrothermal fluids. Carbon and oxygen isotope values in marble are similar with those of metamorphic and skarn marbles, indicating a magmatic origin. Overall, mineralogical and geochemical analyses propose a uniform source and/or geological process for all studied marbles.

Abstract Image

与萨卡里亚区东部(土耳其东北部居米什哈尼)碳酸盐岩包裹铁矽卡岩的比较:地貌、地球化学和稳定同位素方法
土耳其东北部东部的碳酸盐岩位于庞蒂德古岩浆弧内,经常与花岗岩地层相接触,该地区经常出现矽卡岩矿化现象。这些碳酸盐岩通常位于山脊和山坡上,主要沿东西、东北-西南和西北-东南方向分布。一部分石灰岩被命名为生物岩,经过变质后呈现出囊状纹理。这些碳酸盐岩主要由方解石组成,次生石英和氧化铁矿物较少,属于贫铁钙质碳酸盐岩和镁质碳酸盐岩,具有较高的 CaO 和 LOI 含量。大理岩和重结晶石灰岩具有粒状纹理,主要由方解石组成,石英、磁铁矿和赤铁矿较少。大理岩分类图显示,从石灰岩到大理岩(或矽卡岩),氧化钙(或二氧化碳)减少,氧化镁增加,表明钙矽卡岩矿化。锶含量与岩石圈碳酸盐平均值略有偏差,而由于矽卡岩变质作用造成的低铷含量则表明不存在含钾矿物。碳酸盐岩中较高的 Al2O3/SiO2 表明存在热液活动,而碳酸盐岩的脱离表明其实际温度可能会影响 Ce 和 Al 的迁移率。碳酸盐岩中的低自生U值、低U/Th比值和低Ni/Co比值表明原岩成分是在缺氧条件下沉积的。石灰岩和大理岩中的正 Eu 异常表明受到热液的影响。大理石中的碳和氧同位素值与变质大理石和矽卡岩大理石中的碳和氧同位素值相似,表明其起源于岩浆。总之,矿物学和地球化学分析表明,所有研究的大理石都有统一的来源和/或地质过程。
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来源期刊
Carbonates and Evaporites
Carbonates and Evaporites 地学-地质学
CiteScore
2.80
自引率
14.30%
发文量
70
审稿时长
3 months
期刊介绍: Established in 1979, the international journal Carbonates and Evaporites provides a forum for the exchange of concepts, research and applications on all aspects of carbonate and evaporite geology. This includes the origin and stratigraphy of carbonate and evaporite rocks and issues unique to these rock types: weathering phenomena, notably karst; engineering and environmental issues; mining and minerals extraction; and caves and permeability. The journal publishes current information in the form of original peer-reviewed articles, invited papers, and reports from meetings, editorials, and book and software reviews. The target audience includes professional geologists, hydrogeologists, engineers, geochemists, and other researchers, libraries, and educational centers.
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