Acigöl rhyolite field, central Anatolia (part II): geochemical and isotopic (Sr–Nd–Pb, δ18O) constraints on volcanism involving two high-silica rhyolite suites
Acigöl rhyolite field, central Anatolia (part II): geochemical and isotopic (Sr–Nd–Pb, δ18O) constraints on volcanism involving two high-silica rhyolite suites
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安纳托利亚中部 Acigöl 流纹岩田（第二部分）：地球化学和同位素（SrâNdâPb，δ18O）对涉及两个高硅流纹岩套的火山活动的限制
DOI：
10.1007/s00410-011-0651-2
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发表时间：
2011
影响因子：
3.5
通讯作者：
Danisík
中科院分区：
文献类型：
--
作者：
Siebel;Schmitt;Kiemele;Danisík
Acigöl流纹岩场爆发了土耳其安纳托利亚中部卡帕多西亚火山省最近的高硅流纹岩。火山喷发年龄约为150-200 ka（东群）和20-25 ka（西群）。在成分上，东部流纹岩组熔岩的演化程度较低（SiO2= 74-76重量%），而西部流纹岩组具有较高的二氧化硅丰度（SiO2= ~77重量%），并具有极其贫乏的长石相容微量元素。各组内的143 Nd/144 Nd（0.51257-0.51265）和Pb同位素组成（206 Pb/204 Pb = 18.87- 18.88，207 Pb/204 Pb = 15.65-15.67，208 Pb/204 Pb = 38.94-38.98）均较均一。西群流纹岩的δ 18 O（锆石）值（5.7 ± 0.2‰）与地幔重叠，而东群流纹岩的δ 18 O值富集约0.5‰，与εNd值降低的趋势一致。相比之下，西部群流纹岩的放射成因87 Sr/86 Sr比值（0.7065-0.7091）明显高于东部群流纹岩的放射成因87 Sr/86 Sr比值（0.7059-0.7065）。角状花岗质捕虏体的存在和水化作用（基于烧失量数据）和西部熔岩中87 Sr/86 Sr之间的相关性，表明Sr是在喷发或喷发后蚀变过程中加入的。同位素限制排除了流纹岩岩浆是由任何已知的区域结晶基底岩石部分熔融形成的可能性。在Acigöl气田外围喷发的玄武岩和安山岩的特征是87 Sr/86 Sr比值在0.7040 - 0.7053之间，143 Nd/144 Nd = 0.51259- 0.51300，206 Pb/204 Pb = 18.85- 18.87，207 Pb/204 Pb = 15.646-15.655，208Pb/204Pb = 38.90-38.97。同位素和微量元素的数据有利于起源的rhythmia混合玄武质/安山质岩浆与少量的地壳熔体，然后广泛的分离结晶。
The Acigöl rhyolite field erupted the most recent high-silica rhyolites within the Cappadocian Volcanic Province of central Anatolia, Turkey. It comprises two sequences of domes and pyroclastic rocks with eruption ages of ~150–200 ka (eastern group) and ~20–25 ka (western group). Compositionally, the eastern rhyolite group lavas are less evolved (SiO2= 74–76 wt%), whereas the western group has higher silica abundance (SiO2= ~77 wt%) with extremely depleted feldspar-compatible trace elements. Within each group, compositional variability is small and143Nd/144Nd (0.51257–0.51265) and Pb isotope compositions (206Pb/204Pb = 18.87–18.88,207Pb/204Pb = 15.65–15.67 and208Pb/204Pb = 38.94–38.98) are homogeneous. The western group rhyolites have δ18O(zircon) overlapping mantle values (5.7 ± 0.2‰), whereas eastern group rhyolites are enriched in δ18O by ~0.5‰, consistent with a tendency to lower εNd values. By contrast, western group rhyolites have markedly more radiogenic87Sr/86Sr ratios (0.7065–0.7091) compared to those of the eastern group (0.7059–0.7065). The presence of angular granitic xenoliths and a correlation between hydration (based on loss on ignition data) and87Sr/86Sr in the western lavas, however, indicates that Sr was added during the eruption or post-eruption alteration. Isotope constraints preclude the possibility that the rhyolite magmas formed by partial melting of any known regional crystalline basement rocks. Basalts and andesites erupted in the periphery of the Acigöl field are characterised by87Sr/86Sr ratios between 0.7040 and 0.7053,143Nd/144Nd = 0.51259–0.51300,206Pb/204Pb = 18.85–18.87,207Pb/204Pb = 15.646–15.655,208Pb/204Pb = 38.90–38.97. The isotopic and trace element data favour an origin of the rhyolites by mixing of basaltic/andesitic magmas with minor amounts of crustal melts and followed by extensive fractional crystallization.
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