The Colider and Roosevelt Volcanic rocks (sw amazonian craton): geochemistry and sm-nd isotope characteristics of a silicic large igneous province

被引：0
作者：
Bruna Saar de Almeida
Mauro César Geraldes
Carlos Augusto Sommer
Felipe Corrales
Antonio João Paes de Barros
机构：
[1] Universidade do Estado do Rio de Janeiro,
[2] University of Geneva,undefined
[3] Universidade Federal do Rio Grande do Sul,undefined
[4] METAMAT (Mato Grosso State Geological Survey),undefined
来源：
Acta Geochimica | 2021年 / 40卷
关键词：
Amazonian craton; Geochemistry; Sm-Nd isotopes; Paleoproterozoic; Volcanism;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The volcanic rocks of the Colíder and Roosevelt formations are extensively exposed in the south-central portion of the Amazonian Craton where effusive and pyroclastic rocks have been mapped. Both units, topped by chemical sediments and oceanic facies as rhyolite and andesite lavas, rhyodacite, and porphyritic dacite, with frequent intercalations of pyroclastic and epiclastic deposits. Whole-rock geochemistry for 55 samples of rhyolitic to andesitic composition suggests the involvement of fertile mantle-derived components with E-MORB to OIB compositions. The analyzed rocks display calc-alkaline to shoshonitic affinity consistent with generation related to an active continental margin. The whole-rock Sm-Nd isotope data from selected felsic volcanic rocks of the Colíder and Roosevelt formations yield negative initial εNd values between –3 and –9, indicating the predominantly crustal nature of the parental magmas with early Archean to late Paleoproterozoic (ca. 2.5–2.0 Ga) depleted mantle model ages.
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页码：1023 / 1049
页数：26
相关论文
共 234 条
[1]  
Agangi A(2012)Evolution and emplacement of high fluorine rhyolites in the Mesoproterozoic Gawler silicic large igneous province, South Australia Precambr Res 208–211 124-144
[2]  
Kamenetsky VS(2009)The K/U ratio of the silicate earth: insights into mantle composition, structure, and thermal evolution Earth Planet Sci Lett 278 361-369
[3]  
McPhie J(2013)The Paleoproterozoic Aripuana Zn-Pb-Ag (Au, Cu) Volcanogenic Massive Sulfide Deposit, Mato Grosso, Brazil: Geology, Geochemistry of Alteration, Carbon and Oxygen Isotope Modeling, and Implications for Genesis Econ Geol 108 781-811
[4]  
Arevalo R(2008)Columbia revisited: Paleomagnetic results from the 1790 Ma Colíder volcanics (SW Amazonian Craton, Brazil) Precambr Res 164 40-49
[5]  
McDonough WF(2019)Paleoproterozoic (~2.0 Ga) volcano-plutonism in the southeastern region of the Amazon Craton: Petrologicalaspects and geotectonic implications. 2019 Geolo.J. 2019 1-23
[6]  
Luong M(2007)Silicic large igneous provinces: Episodes 30 20-31
[7]  
Biondi JC(2008)Revised definition of large igneous provinces (LIPs) Earth-Science Reviews 125 1053-1078
[8]  
Santos RV(2013)Large igneous provinces and silicic large igneous provinces: progress in our understanding over the last 25 years Geol Soc Am Bull 49 47-77
[9]  
Cury LF(2008)New insights into crustal contributions to large volume rhyolite generation at the mid-Tertiary Sierra Madre Occidental Province Mexico, Revealed by U-Pb Geochronology: Journal of Petrology 1 265-269
[10]  
Bispo-Santos F(2005)Large igneous provinces and the mantle plume hypothesis Elements 99 79-93
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