The 1.88 Ga Uatumã Magmatism in the Serra dos Magalhães region: petrology and implications to the extension of the south-eastern edge of the Amazonian Craton

IF 1.3 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Brazilian Journal of Geology Pub Date : 2021-01-01 DOI:10.1590/2317-4889202120200046
I. Lima, Ronaldo Pierosan, Márcia Aparecida de Sant'Ana Barros, R. Rubert, C. Sommer, Diogo Isamu de Almeida Okuno
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Abstract

The Amazonian Craton (AC) is a Pre-Cambrian tectonic segment that extends over 4.3 × 10 5 km 2 at the northern portion of the South American Platform. Phanerozoic sedimentary basins cover most of the edges of the AC and sparse occurrences of Precambrian rocks may aid the definition of its extension. One of these occurrences is the volcano-plutonic rocks that outcrop in the Serra dos Magalhães region, which relates to the Uatumã Magmatism, an expressive Orosirian magmatic event that constitutes a Siliceous Large Igneous Province. Effusive rhyodacites and rhyolites comprise the volcanic unit and the plutonic counterpart consists of epizonal monzogranites. Whole-rock geochemistry indicates an A2-type granite affinity to all magmatic rocks. Contrasting signatures suggest a magmatic evolution from a single stratified magma chamber. U-Pb zircon crystallization ages are 1870 ± 11 Ma for the rhyodacites, 1879 ± 5 Ma for the monzogranites, and a slightly younger age of 1863 ± 14 Ma for the rhyolites. Interpretation of satellite and geophysical images allows the recognition of regional lineaments in the Parecis and Bananal basins that suggest the extension of the AC up to the Tucurui Fault in the eastern portion (Bananal Basin) and up to the Brasnorte High in the southern part (Parecis Basin).
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Serra dos magalh地区1.88 Ga Uatumã岩浆活动:岩石学及其对亚马逊河克拉通东南边缘伸展的意义
亚马逊河克拉通(AC)是一个前寒武纪的构造段,在南美洲地台的北部延伸超过4.3 × 10 5 km 2。显生宙沉积盆地覆盖了AC的大部分边缘,前寒武纪岩石的稀疏分布有助于确定其扩展范围。其中之一是在Serra dos magalh地区露头的火山-深成岩,它与Uatumã岩浆活动有关,这是一个具有代表性的构成硅质大火成岩省的奥陶纪岩浆事件。喷涌流纹岩和流纹岩组成了火山单元,而深成相对应的火山单元由层外二长花岗岩组成。全岩地球化学特征表明花岗岩与所有岩浆岩具有a2型亲和关系。对比特征表明岩浆演化来自单一的分层岩浆房。流纹岩的U-Pb结晶年龄为1870±11 Ma,二长花岗岩为1879±5 Ma,流纹岩的U-Pb结晶年龄为1863±14 Ma。通过对卫星和地球物理图像的解释,可以识别出parrecis和Bananal盆地的区域轮廓,表明AC延伸至东部的Tucurui断裂(Bananal盆地)和南部的Brasnorte High (parrecis盆地)。
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来源期刊
Brazilian Journal of Geology
Brazilian Journal of Geology GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.20
自引率
7.10%
发文量
12
审稿时长
11 weeks
期刊介绍: The Brazilian Journal of Geology (BJG) is a quarterly journal published by the Brazilian Geological Society with an electronic open access version that provides an in-ternacional medium for the publication of original scientific work of broad interest concerned with all aspects of the earth sciences in Brazil, South America, and Antarctica, in-cluding oceanic regions adjacent to these regions. The BJG publishes papers with a regional appeal and more than local significance in the fields of mineralogy, petrology, geochemistry, paleontology, sedimentology, stratigraphy, structural geology, tectonics, neotectonics, geophysics applied to geology, volcanology, metallogeny and mineral deposits, marine geology, glaciology, paleoclimatology, geochronology, biostratigraphy, engineering geology, hydrogeology, geological hazards and remote sensing, providing a niche for interdisciplinary work on regional geology and Earth history. The BJG publishes articles (including review articles), rapid communications, articles with accelerated review processes, editorials, and discussions (brief, objective and concise comments on recent papers published in BJG with replies by authors). Manuscripts must be written in English. Companion papers will not be accepted.
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