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首页> 外文OA文献 >El volcanismo basáltico de la formación dumisseau en la sierra de bahoruco, SO de la República Dominicana: Registro del magmatismo de pluma mantélica de la provincia ígnea caribeña
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El volcanismo basáltico de la formación dumisseau en la sierra de bahoruco, SO de la República Dominicana: Registro del magmatismo de pluma mantélica de la provincia ígnea caribeña

机译：多米尼加共和国西南部塞拉利昂德巴霍鲁科山脉的dumisseau地层的玄武质火山活动：火成的加勒比海省的地幔岩浆羽毛记录

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The Dumisseau Fm outcropping in the Sierra de Bahoruco offers the opportunity for studying on land the mantle plume magmatism generator of the Caribbean large igneous province (CLIP) during the Late Cretaceous. It consists of a sequence of about 1.0-1.5 km-thick mainly composed of mafic basaltic flows and pyroclastic deposits, with subordinated volcanogenic sedimentary deposits and syn-volcanic doleritic sills and dikes. All the volcanic rocks were erupted or re-sedimented in relatively deep-marine conditions, as evi-infedenced by the rare interbedded chert and pelagic limestone. On the basis of the MgO, TiO2 and incompatible trace elements contents three geochemical groups have been identified in the Dumisseau Fm: low-Ti tholeiites; high-Ti or transitional basalts; and high-Ti and LREE alkaline basalts. Geochemical modelling indicates a derivation from melts generated and incorporated at different depths in the mantle, which is consistent with the processes that take place during the rise of a mantle plume beneath the oceanic crust. Two 40Ar/39Ar wholerock ages indicate the extrusion of magmas at least in the 92-74. Ma time interval (Turonian-Coniacian boundary to Maastrichtian), resulting coeval with the formation of the CLIP. As a result, the Dumisseau Fm is an emerged fragment of the CLIP, with which it must have continuity through the Beata Ridge. These rocks are unconformably overlain by carbonate red algae facies of the middle-upper Eocene, constituting the volcanic basement of the Sierra de Bahoruco. © 2017, Instituto Geologico y Minero de Espana. All rights reserved.
机译：巴霍鲁科山脉的Dumisseau Fm露头为研究白垩纪晚期加勒比大火成岩省（CLIP）的地幔柱岩浆成岩作用提供了机会。它由约1.0-1.5 km厚的层序组成，主要由镁铁质玄武岩流和火山碎屑沉积物组成，具有次要的火山成因沉积物沉积物和同火山灰质基岩和堤坝。所有火山岩都是在相对较深的海洋条件下喷出或重新沉积的，这是由稀少的夹层cher石和浮游石灰岩所证明的。根据MgO，TiO2和不相容的微量元素含量，Dumisseau Fm中已确定了三个地球化学组：高钛或过渡玄武岩；以及高Ti和LREE碱性玄武岩。地球化学模型表明，地幔中不同深度的熔体产生并吸收了熔体，这与洋壳下方地幔柱上升过程中发生的过程一致。两个40Ar / 39Ar全岩时代至少在92-74年表明岩浆挤压。 Ma时间间隔（到Maastrichtian的Turonian-Coniacian边界），与CLIP的形成同时期。因此，Dumisseau Fm是CLIP的一个新兴片段，通过它必须在Beata Ridge中具有连续性。这些岩石不均匀地覆盖着始新世中上部的碳酸盐红藻相，构成了塞拉利昂德巴霍鲁科山脉的火山基底。 ©2017，地质研究所和西班牙Minero de西班牙。版权所有。

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