巴西圣卡塔琳娜州Morro da Igreja paran岩浆省管道系统和熔岩堆的就位动力学

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Ana Carolina Massulini Acosta , Luana Moreira Florisbal , Jairo Francisco Savian , Breno Leitão Waichel , Mateus Souza da Silva , Ricardo Ivan Ferreira da Trindade
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引用次数: 0

摘要

LIPs火山堆的岩浆上升、输送和侵位机制是理解火山系统复杂构造和岩浆通过地壳输送的关键问题。火山体和次火山体的形态、全岩地球化学和ASM数据的综合方法为揭示火山体的流动动力学和岩浆事件的序列提供了强有力的工具。这种方法允许在考虑管道系统所起作用的情况下建立熔岩堆的施工模型。本文研究了巴西中生代Paraná-Etendeka岩浆省(PEMP)南部Serra Geral群(SGG)岩床和熔岩流的侵位机制。在圣卡塔琳娜熔岩堆顶部Morro da Igreja地区的14个采样点,将地质和地球化学分析与磁化率各向异性(AMS)、非磁滞剩磁各向异性(AARM)和岩石磁学实验相结合。该区域由低Ti玄武岩(主要为碎石状pahoehoe)和硅化熔岩流组成,两者都被一个宽达几百米的板状岩床侵入。镁铁质熔岩流由Gramado、Urobici和Esmeralda岩浆型玄武岩和安山岩玄武岩组成。硅化熔岩流呈块状或片状,属于Palmas型英安岩。该岩床具有规则的柱状节理,属于Esmeralda型。磁性矿物学数据表明,磁铁矿或贫钛磁铁矿是所有火成岩的主要磁性矿物,AARM结果显示熔岩流的异常组构和岩床的正常或中间组构。除了异常组构位置外,AMS数据还提供了可靠的方向数据来推断岩床的流动方向,最初向NE方向传播,然后是岩浆流动的优先SE方向。对于硅化岩,垂直和倾斜磁叶理的存在表明熔岩圆顶的几何形状。岩床的岩浆流和与岩石成分特征相关的熔岩流的动力学可以确定该地区岩浆事件的地层学,并提出该序列的侵位模型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Emplacement dynamics of the plumbing system and lava pile of the Paraná Magmatic Province in Morro da Igreja, Santa Catarina, Brazil

The mechanisms of magma ascent, transport and emplacement of the volcanic pile from LIPs are key issues regarding the understanding of the complex construction of volcanic systems and magma transport through the crust. The integrated approach of morphology of the volcanic and subvolcanic bodies, whole rock geochemistry and ASM data provides a robust tool to unravel the flow dynamics of the volcanic bodies and the sequence of the magmatic events. Such approach allows building up a model of construction of the lava pile considering the role played by the plumbing system. This paper investigates the emplacement mechanism of sill and lava flows of the Serra Geral Group (SGG), in the southern part of Mesozoic Paraná-Etendeka Magmatic Province (PEMP) in Brazil. Geologic and geochemical analysis were integrated with anisotropy of magnetic susceptibility (AMS), anisotropy of anhysteretic remanent magnetization (AARM) and rock magnetism experiments on 14 sampling sites in the Morro da Igreja region, top of the lava pile in Santa Catarina. The area is composed of low-Ti basaltic (with predominance of rubbly pahoehoe) and silicic lava flows, both intruded by a tabular sill that reaches a few hundred meters wide. The mafic lava flows are composed of Gramado, Urubici and Esmeralda magma-type basalts and andesite basalts. The silicic lava flows are massive or foliated, classified as Palmas type dacites. The sill has regular columnar joints and is classified as Esmeralda type. Magnetic mineralogy data suggests magnetite or Ti-poor magnetite as the main magnetic mineral for all the igneous rocks, and AARM results show anomalous fabric for the lava flows and normal or intermediate fabric for the sill. Besides the anomalous fabric sites, AMS data provide reliable directional data to infer flow direction for the sill, with initial propagation towards NE, followed by a preferential SE direction of magma flow. For the silicic rocks, the presence of vertical and inclined magnetic foliation suggest a lava dome geometry. The dynamics of the magmatic flow of the sill and lava flows associated with the compositional characteristics of the rocks allows stablishing the stratigraphy of the magmatic events in the area as well as the proposition of an emplacement model for the sequence.

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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
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