EOCHEMICAL, MINERALOGICAL AND DIAGENETIC CHARACTERISTICS OF MARINE CHERT IN THE HATAY REGION, S-TURKEY: ITS ORIGIN AND DEPOSITIONAL ENVIRONMENT

IF 0.9 4区 环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES
Meryem YEŞİLOT KAPLAN
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Abstract

Trace elements and rare earth elements (REEs) were studied to determine the formation of chert and siliceous limestones, which are predominantly observed in the Okçular formation. Cherts are divided into four types according to their varying forms depending on the deposition and diagenesis stages: (Type-I) layered cherts formed by direct precipitation from sea water, (Type-II) nodular cherts with rim formed by replacement, (Type-III) homogeneous chert nodules without rim, (Type-IV) chert micro nodules with high porosity. The porosity of stylolite-fracture networks and the chemical composition of seawater played a role in the formation of different types and sizes in cherts. The rim of Type II nodular cherts has significant color changes and porosity up to 20%. Anomalies of major and trace elements, especially La, Y, Sc, Ce, Th, U and Gd values, indicate direct deposition and replacement of early diagenetic pelagic deposits of cherts in the oxidized marine environment. Total (REE)+Y values, high LREE/HREE ratio and low Ce values indicate that dissolved seawater of chemical or biogenetic origin has a role in silicification. According to the similarity of the hierarchical cluster analysis of the chemical contents of the Okçular formation and the ophiolites, the silicon in the chert formation originates from the ophiolites.
土耳其哈塔伊地区海相燧石的地球化学、矿物学和成岩特征及其成因与沉积环境
研究了微量元素和稀土元素(REEs),以确定燧石和硅质石灰石的形成,这些石灰石主要在Okçular地层中观察到。根据沉积和成岩阶段的不同,燧石的形态可分为四种:(I型)海水直接沉淀形成的层状燧石;(II型)置换形成的带边缘的结节状燧石。缝合线断裂网络的孔隙度和海水的化学成分在燧石中形成不同类型和大小的燧石中起着一定作用。II型结节状燧石的边缘具有显著的颜色变化和高达20%的孔隙率。主元素和微量元素的异常,特别是La、Y、Sc、Ce、Th、U和Gd值的异常,表明在氧化的海洋环境中,燧石的早成岩远洋沉积物直接沉积和置换。总(REE)+Y值、高LREE/HREE比和低Ce值表明化学或生物成因的溶解海水在硅化中起作用。根据Okçular组和蛇绿岩化学成分的层次聚类分析的相似性,燧石组中的硅来源于蛇绿岩。
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来源期刊
CiteScore
2.30
自引率
25.00%
发文量
42
审稿时长
12-24 weeks
期刊介绍: The publishing of CARPATHIAN JOURNAL of EARTH and ENVIRONMENTAL SCIENCES has started in 2006. The regularity of this magazine is biannual. The magazine will publish scientific works, in international purposes, in different areas of research, such as : geology, geography, environmental sciences, the environmental pollution and protection, environmental chemistry and physic, environmental biodegradation, climatic exchanges, fighting against natural disasters, protected areas, soil degradation, water quality, water supplies, sustainable development.
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