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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Geological, geochemical and isotope diversity of ～ 134 Ma dykes from the Florianopolis Dyke Swarm, Parana Magmatic Province: Geodynamic controls on petrogenesis
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Geological, geochemical and isotope diversity of ～ 134 Ma dykes from the Florianopolis Dyke Swarm, Parana Magmatic Province: Geodynamic controls on petrogenesis

机译：巴拉那岩浆省弗洛里亚诺波利斯堤防群中〜134 Ma堤的地质，地球化学和同位素多样性：成岩作用的地球动力学控制

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摘要

The Florianopolis Dyke Swarm (FDS), one of the major dyke swarms belonging to the Early cretaceous (135-131 Ma) Parana Magmatic Province, is largely dominated by high Sr-Ti-P basalts that are confirmed here as feeders of the unique Urubici (=Khumib) lavas of the Parana and Edendeka lava piles on the basis of their age and geochemistry. Our study integrates field, petrographic, whole-rock geochemistry, and Sr-Nd-Pb isotope geochemistry of representative samples from three main areas of exposition (Santa Catarina Island, Garopaba and Pinheira beaches), thus encompassing the whole extension of the FDS. Compared to the Urubici lavas, the dykes have usually higher contents of LILE and LREE, more radiogenic Sr and Pb, and more unradiogenic Nd, features attributed to a more pronounced interaction with melts derived from the country rocks registered in the basic magmas that remained in the conduits. Some of these dykes show strongly interactive contacts that must be part of a wider zone of crustal melting, probably more developed at greater depths. Small volumes of intermediate to acidic rocks form the cores of some composite dykes, and correspond to products of fractional crystallization from Urubici basalts contaminated with high Rb/Sr, and U/Th crustal melts (probably derived from Neoproterozoic granites), as indicated by geochemical and Sr-Nd-Pb isotope data. The chemical and isotope signatures of the less contaminated FDS basalts and related Urubici lavas do not show clear evidence of inputs from primitive mantle, and seem heavily influenced by enriched mantle. This suggests that the mantle wedge that was affected by subduction during the Neoproterozoic may have been frozen and coupled to the base of the litho spheric plate where the Early cretaceous magmatism occurred. A control of previous tectonic limits on the sources of the Urubici basalts seems evident, since they seem to be related to the younger lithosphere from the South Domain, related to the Florianopolis Batholith, and no influence from the older "cratonic" lithosphere of the Central Domain can be identified in their feeders. (C) 2017 Elsevier B.V. All rights reserved.
机译：弗洛里亚诺波利斯堤防群（FDS）是属于白垩纪早期（135-131 Ma）巴拉那玛格马特省的主要堤防群之一，在很大程度上被高Sr-Ti-P玄武岩所占据，这里被证实是独特的Urubici的馈电线（= Khumib）巴拉那和Edendeka熔岩的熔岩基于它们的年龄和地球化学。我们的研究整合了来自三个主要博览会地区（圣卡塔琳娜岛，加罗帕巴和平黑拉海滩）的代表性样品的田间，岩石学，全岩石地球化学和Sr-Nd-Pb同位素地球化学，从而涵盖了FDS的整个扩展。与Urubici熔岩相比，这些堤坝通常具有更高的LILE和LREE含量，更多的放射源Sr和Pb以及更多的非放射源Nd，这些特征归因于与保留在基本岩浆中的乡村岩石熔体产生的相互作用更加明显。导管。这些堤坝中的某些堤坝显示出强烈的相互作用接触，这些接触必定是地壳融化的较宽区域的一部分，而地壳融化的深度可能更大。由地球化学表明，少量的中级至酸性岩石形成了一些复合岩脉的核心，并且对应于受高Rb / Sr污染的Urubici玄武岩和U / Th地壳熔体的分级结晶产物（可能来自新元古代花岗岩）和Sr-Nd-Pb同位素数据。受污染较少的FDS玄武岩和相关的Urubici熔岩的化学和同位素特征并未显示出原始地幔输入的明确证据，并且似乎受到了地幔富集的严重影响。这表明在新元古代发生俯冲作用的地幔楔可能已经冻结并耦合到早白垩世岩浆作用发生的岩石圈板底部。控制乌鲁比奇玄武岩来源的先前构造限制似乎很明显，因为它们似乎与来自南域的年轻岩石圈有关，与弗洛里亚诺波利斯岩床有关，并且不受中部较旧的“克拉通”岩石圈的影响可以在其馈送器中标识域。 （C）2017 Elsevier B.V.保留所有权利。

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