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首页> 外文期刊>Journal of Asian earth sciences >Petrology and geochemistry of Tertiary volcanic rocks from the Ikizce (Ordu) area, NE Turkey: Implications for the evolution of the eastern Pontide paleo-magmatic arc
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Petrology and geochemistry of Tertiary volcanic rocks from the Ikizce (Ordu) area, NE Turkey: Implications for the evolution of the eastern Pontide paleo-magmatic arc

机译：土耳其东北部Ikizce（Ordu）地区第三纪火山岩的岩石学和地球化学：东部蓬蒂德古岩浆弧演化的意义

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摘要

Tertiary volcanism in the Ikizce region at the western edge of the eastern Pontides paleo-magmatic arc is represented by basaltic and andesitic rocks associated with sediments deposited in a shallow basin environment. The basaltic rocks contain plagioclase (An_(58-80)), olivine (Fo_(82-84)), clinopyroxene (Wo_(44-48)En_(35) _(42)Fs_(7-17)), hornblende (Mg# = 0.68-0.76) phenocrysts, and magnetite microcrysts, whereas the andesitic rocks include plagioclase (An_(25-61), clinopyroxene (Wo_(46-49)En_(38-43)Fs_(11-13)), hornblende (Mg# = 0.48-0.81), biotite (Mg# = 0.48-0.60) phenocrysts, titanomagnetite, apatite, and zircon microcrysts. Geochemical data indicate magmatic evolution from tholeiitic-alkaline transitional to calc-alkaline characteristics with medium-K contents. The geochemical variation in the rocks can be explained by fractionation of common mineral phases such as clinopyroxene, olivine, hornblende, plagioclase, magnetite, and apatite. The trace elements' distributions of the volcanic rocks show similarities to those of E-Type MORB, have a shape that is typical of rocks from subduction-related tectonic setting with enrichment in LILE and to a lesser extent in LREE, but depletion in HFSE. The rocks evolved from a parental magma derived from an enriched source formed by subduction induced metasomatism of basaltic rocks, the latter formed through clinopyroxene ± olivine controlled fractionation in a high level magma chamber. The andesitic rocks developed through hornblende ± plagioclase controlled fractionation in shallow level magma chamber(s).
机译：蓬蒂德斯东部古岩浆弧西缘的Ikizce地区的第三纪火山活动以玄武岩和安山岩为代表，与浅盆地环境中沉积的沉积物有关。玄武岩中含有斜长石（An_（58-80）），橄榄石（Fo_（82-84）），斜辉石（Wo_（44-48）En_（35）_（42）Fs_（7-17）），角闪石（ Mg＃= 0.68-0.76）的表晶和磁铁矿的微晶，而安山岩包括斜长石（An_（25-61），斜ino（Wo_（46-49）En_（38-43）Fs_（11-13）），角闪石（Mg＃= 0.48-0.81），黑云母（Mg＃= 0.48-0.60）隐晶，钛磁铁矿，磷灰石和锆石微晶地球化学数据表明，岩浆从高碱性向过渡性转变为钙含量呈中等K的钙碱性。岩石中的地球化学变化可以用常见的矿物相（如斜辉石，橄榄石，角闪石，斜长石，磁铁矿和磷灰石）的分馏来解释，火山岩的痕量元素分布与E型MORB相似。这种形状是俯冲相关构造环境中岩石的典型特征，LILE富集，LREE富集程度较小，而HFSE富集。岩石是从母岩浆演化而来的，母岩浆是由俯冲引起的玄武岩交代作用形成的富集源形成的，后者是由高品位岩浆室中的斜辉石和橄榄石控制的分馏形成的。浅层岩浆室内通过角闪石±斜长石控制的分馏而发育的安山岩。

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