The provenance of terrigenous mud on reefs in Royal Charlotte Bank, Bahia, Brazil

IF 1.3 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Brazilian Journal of Geology Pub Date : 2023-01-01 DOI:10.1590/2317-4889202320220083
Caio Vinícius Gabrig Turbay, Marcos Tadeu D’Azeredo Orlando, Carlos Henrique Figueiredo Lacerda, Eduardo Baudson Duarte
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Abstract

The East Brazilian continental margin contains a large shelf sector called the Royal Charlotte Bank. It has terrigenous and carbonate sedimentation associated with coastal reefs. Studies using X-ray diffractometry (XRD) and the geochemistry of immobile elements were done in samples of these reefs to figure out the provenance of the mud that arrives there. In order to do this, samples of riverine sediment from the Jequitinhonha, Santo Antônio, João de Tiba, and Buranhém rivers as well as from the Barreiras Group’s sedimentary cliffs were taken. The Jequitinhonha River was found to be the most significant mud source. This was supported by the mineral fingerprints of smectite and biotite, the concentrations of immobile trace elements such as Zr, Hf, Nb, Ta, and Th, and the distribution and ratio of rare-earth elements. These findings are supported by the prevailing north-to-south drift that occurs in the region due to the northeasterly trade winds and waves that blow throughout the region for the vast majority of the year. The findings have significant implications for hydrographic basin management and the protection of reef benthic populations.
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巴西巴伊亚皇家夏洛特滩礁上的陆源泥的来源
巴西东部大陆边缘包含一个被称为皇家夏洛特滩的大型大陆架。有陆源沉积和碳酸盐岩沉积,并伴有海岸礁。利用x射线衍射仪(XRD)和固定元素的地球化学对这些珊瑚礁的样本进行了研究,以确定到达那里的泥浆的来源。为了做到这一点,从Jequitinhonha河、Santo Antônio河、jo o de Tiba河和buranhsamm河以及巴雷拉斯群的沉积悬崖上采集了河流沉积物样本。杰基廷洪哈河被发现是最重要的泥源。蒙脱石和黑云母的矿物指纹图谱、Zr、Hf、Nb、Ta、Th等不可移动微量元素的浓度以及稀土元素的分布和比例都支持了这一观点。这些发现得到了该地区普遍存在的由北向南漂移的支持,这种漂移是由于东北信风和海浪在一年中绝大多数时间吹遍整个地区造成的。这一发现对水文流域管理和珊瑚礁底栖生物种群的保护具有重要意义。
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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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