Upper Pleistocene–Holocene in the continental slope of the Cará Basin: an integrated analysis based on planktic foraminifera, sedimentological and geochemical aspects

IF 0.7 4区地球科学 Q4 PALEONTOLOGY

Revista Brasileira De Paleontologia Pub Date : 2021-09-26 DOI:10.4072/rbp.2021.3.02

Agathe Arrissa Noucoucouk, R. M. Melo, George Satander Sá Freire, E. A. Menor

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引用次数: 1

Abstract

This research addresses paleoclimatic variations using sedimentological, geochemical, and planktic foraminifera. The study was carried out in a survey core (ANP 1011) collected on the continental slope of the Icaraí Sub-basin (Ceará Basin), on the coast of the Municipality of Itapipoca, CE, Brazil. Particle size analysis, CaCO3 content, Ti/Ca and Fe/Ca ratios, and the analysis of foraminifera associations for biostratigraphic purposes were performed. Based on the relative abundance of planktic foraminifera, with indicators of warm and cold water throughout the studied cores, two biozones (Y: Upper Pleistocene and Z: Holocene), and two subzones (Z2 and Z1) were recognized. The data of sedimentological markers obtained confirmed the occurrence of more wet phases in northeastern Brazil during the early stages of the Holocene. The Ti/Ca and Fe/Ca ratios, as well as the geochemical and micropaleontological proxies, indicated a farther north displacement of the Intertropical Convergence Zone (ITCZ) in the Pleistocene–Holocene transition. This may have caused greater precipitation in the Northeastern region of Brazil, effectuating the entry of a high volume of terrestrial sediments directly into the ocean basin. Keywords: Quaternary biostratigraphy, marine sedimentation, ITCZ mobility, paleoclimate.

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car盆地陆坡上更新世-全新世:基于浮游有孔虫、沉积学和地球化学的综合分析

本研究利用沉积学、地球化学和浮游有孔虫研究古气候变化。这项研究是在巴西CE伊塔皮波卡市海岸伊卡拉亚盆地（Cearábasin）的大陆斜坡上收集的调查岩心（ANP 1011）中进行的。进行了粒度分析、CaCO3含量、Ti/Ca和Fe/Ca比率，以及用于生物地层学目的的有孔虫组合分析。根据浮游有孔虫的相对丰度，以及整个研究岩心的温水和冷水指标，识别出两个生物带（Y:上更新世和Z:全新世）和两个子带（Z2和Z1）。获得的沉积学标志物数据证实，在全新世早期，巴西东北部出现了更多的湿相。Ti/Ca和Fe/Ca比值，以及地球化学和微观地球物理指标，表明在更新世-全新世过渡时期，热带辐合带（ITCZ）向北位移更远。这可能导致巴西东北部地区降雨量增加，导致大量陆地沉积物直接进入海盆。关键词：第四纪生物地层学，海洋沉积，ITCZ活动性，古气候。

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来源期刊

Revista Brasileira De Paleontologia PALEONTOLOGY-

CiteScore

1.60

自引率

14.30%

发文量

审稿时长

>12 weeks

期刊介绍： It publishes original contributions on all aspects of Paleontology. Papers are written in English, Spanish, or Portuguese and are reviewed by international experts.