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首页> 外文期刊>European journal of mineralogy >Coexisting calc-alkaline and ultrapotassic magmatism at Monti Ernici, Mid Latina Valley (Latium, central Italy)
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Coexisting calc-alkaline and ultrapotassic magmatism at Monti Ernici, Mid Latina Valley (Latium, central Italy)

机译：中拉提纳山谷（意大利中部拉提姆）的蒙蒂埃尔尼奇同时存在钙碱性和超钾化岩浆作用

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New major and trace element data, and Sr-Nd-Pb-O isotopic ratios for volcanic mafic rocks outcropping at Monti Ernici in the Mid Latina Valley (southern Latium) are reported, with the aim of investigating the nature and evolution of Plio-Quaternary K-rich volcanism in Central Italy. Petrographical and geochemical studies allow us to identify mafic rocks ranging from ultrapotassic (HKS) to shoshonitic (SHO), and cale-alkaline (CA), these last ones being identified for the first time. The CA rocks exhibit the most primitive signatures for Sr, Nd, and Pb isotopes (Sr-87/Sr-86 = 0.706326-0.706654; Nd-143/Nd-144 = 0.5 12388-0.512361; Pb-206/Pb-204 = 18.944-18.940). The delta O-18 values are variable delta O-18(cpx) from +5.75 to +7.08 parts per thousand; and delta O-18(ol) from +5.50 to +6.23 parts per thousand), suggesting interaction with carbonate wall rocks. Radiogenic isotope ratios and incompatible elements distribution have several characteristic in common with equivalent rocks from Pontine Islands (Ventotene), Campania and Aeolian arc volcanoes. Conversely, the HKS rocks closely resemble the ultrapotassic rocks from the Roman Province (Sr-87/Sr-86 = 0.709679-0.711102; delta O-18(cpx) from +6.27 to +7.08 parts per thousand). The high ratios of LILE (Large Ion Lithophile Elements: Rb, Cs, Th, U, K, LREE) and HFSE (High Field Strength Elements: Ta, Nb, Zr, Hf, Ti), and radiogenic isotope compositions of CA to HKS rocks indicate that all suites contain subduction-related components, and suggest a N-MORB-type mantle source variably contaminated by hydrous fluids and/or melts released by undergoing slabs, possibly during two distinct stages of metasomatism. The coexistence of ultra-alkaline and sub-alkaline orogenic magmatism, combined with tectonic, geophysical and geological evidence, support the possibility that the mantle beneath central-southern Italy (Ernici-Roccamonfina Province) was vertically zoned and produced different magma suites during time.
机译：报告了新的主要和微量元素数据，以及中拉提纳南部（南部）的蒙蒂艾尔尼奇火山岩镁铁质岩浆露头的Sr-Nd-Pb-O同位素比，目的是调查上古第四纪的性质和演化意大利中部富含钾的火山活动。岩石学和地球化学研究使我们能够识别出镁铁质岩石，从超钾盐（HKS）到shoshonitic（SHO）以及钙碱性（CA），最后一次被发现。 CA岩石展现出Sr，Nd和Pb同位素的最原始特征（Sr-87 / Sr-86 = 0.706326-0.706654; Nd-143 / Nd-144 = 0.5 12388-0.512361; Pb-206 / Pb-204 = 18.944-18.940）。增量O-18值为变量增量O-18（cpx），从+5.75到+7.08千分之几;和δO-18（ol）从+5.50到+6.23千分之几），表明与碳酸盐岩围岩相互作用。放射性同位素比和不相容元素的分布与庞廷群岛（Ventotene），坎帕尼亚和风成弧火山的等效岩石具有几个共同点。相反，HKS岩石与罗马省的超钾质岩石非常相似（Sr-87 / Sr-86 = 0.709679-0.711102;δO-18（cpx）从+6.27到+7.08千分之几。 LILE（大离子亲脂元素：Rb，Cs，Th，U，K，LREE）和HFSE（高场强元素：Ta，Nb，Zr，Hf，Ti）的高比例，以及CA与HKS的放​​射性同位素组成岩石表明，所有套件都包含俯冲作用相关的成分，并暗示了N-MORB型地幔源可能会受到交代作用的两个不同阶段的影响，这些源可能会受到经历板坯释放的含水流体和/或熔体的污染而受到不同程度的污染。超碱性和亚碱性造山岩浆作用的共存，再加上构造，地球物理和地质证据，支持了意大利中南部（埃尼奇-罗卡蒙尼纳省）下的地幔被垂直划分并在一段时间内产生了不同的岩浆组合的可能性。

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