Chemical and Physical Denudation Rates in the Poços de Caldas Alkaline Massif, Minas Gerais State, Brazil

IF 2.2 4区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Minerals Pub Date : 2024-07-09 DOI:10.3390/min14070700

Fabiano Tomazini da Conceição, Rafael Carvalho Alves de Mello, Alexandre Martins Fernandes, Diego de Souza Sardinha

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Abstract

Chemical and physical denudation rates have been assessed in areas with different lithologies. Surprisingly, there are no studies that attempt to document these rates in the Poços de Caldas Alkaline Massif (PC), the largest alkaline magmatism in South America and an important Al supergene deposit in Brazil. Therefore, the chemical and physical denudation rates were assessed and explained in the PC. Surface water and rainwater samples were collected at the Amoras Stream basin, covering one complete hydrological cycle (2016). All samples were analyzed for dissolved cations, silica, anions, total dissolved solids (TDS), and total suspended solids (TSS). The results reflected the seasonal variation on discharge, water temperature, and electrical conductivity in the Amoras Stream, with most of the cations, anions, silica TDS, and TSS being carried in the wet season. Partial hydrolysis and silicate incongruent dissolution are the main water/rock interactions in the PC, with an atmospheric/soil CO2 consumption rate of 1.6 × 105 mol/km2/a. The annual fluxes of Cl−, PO43−, NO3−, and Al3+ were significantly influenced from rainwater. Chemical and physical weathering rates were 4 ± 0.8 and 3.0 ± 0.6 m/Ma in the PC, respectively, indicating that under the current climatic condition, the weathering profile is in dynamic equilibrium.

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巴西米纳斯吉拉斯州波索斯-德卡尔达斯碱性丘陵的化学和物理剥蚀率

对不同岩性地区的化学和物理剥蚀率进行了评估。令人惊讶的是，目前还没有任何研究试图记录南美洲最大的碱性岩浆岩和巴西重要的铝超生矿床--Poços de Caldas Alkaline Massif（PC）的这些速率。因此，对 PC 的化学和物理剥蚀率进行了评估和解释。在阿莫拉斯溪流域采集了地表水和雨水样本，涵盖了一个完整的水文周期（2016 年）。对所有样本进行了溶解阳离子、二氧化硅、阴离子、总溶解固体（TDS）和总悬浮固体（TSS）分析。结果反映了阿莫拉斯溪的排水量、水温和电导率的季节性变化，大部分阳离子、阴离子、二氧化硅 TDS 和总悬浮固体都是在雨季携带的。部分水解和硅酸盐不协调溶解是 PC 中主要的水/岩石相互作用，大气/土壤二氧化碳消耗率为 1.6 × 105 mol/km2/a。Cl-、PO43-、NO3-和Al3+的年通量受到雨水的显著影响。PC 中的化学和物理风化率分别为 4 ± 0.8 和 3.0 ± 0.6 m/Ma，表明在当前气候条件下，风化剖面处于动态平衡状态。

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来源期刊

Minerals MINERALOGY-MINING & MINERAL PROCESSING

CiteScore

4.10

自引率

20.00%

发文量

1351

审稿时长

19.04 days

期刊介绍： Minerals (ISSN 2075-163X) is an international open access journal that covers the broad field of mineralogy, economic mineral resources, mineral exploration, innovative mining techniques and advances in mineral processing. It publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.