Facies in Submarine Canyons on the Continental Slope of the Argentine Patagonia (SW Atlantic)

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Lithology and Mineral Resources Pub Date : 2022-09-12 DOI:10.1134/S0024490222050066
I. O. Murdmaa, D. G. Borisov, E. V. Ivanova, M. A. Zenina, N. G. Simagin, F. S. Shchepelev
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Abstract

The lithological study of Recent sediments, as well as planktonic foraminiferal tests and macrobenthos therein, within transverse sections of four submarine canyons in the northern sector of the Argentine Patagonia gravitite–contourite system revealed a considerably more complex facies variability within the canyons than on the Perito Moreno Terrace between them. The facies variability in canyons is controlled by a combination of along-slope contour currents and down-canyon gravity flows. Two southern canyons contain the channel facies of terrigenous glauconite-rich sand that separate the flank facies of sand with a high content of foraminiferal tests. Two northern canyons include the facies of mixed sediments with a high content of <0.1 mm fraction, whose analogs are lacking on the surrounding terrace. They were likely deposited from the down-canyon gravity flows of dense suspension in the still-water bottom environment. Attached macrobenthos with calcareous skeletal elements (commonly corals) inhabits the mainly ice- or iceberg-rafted coarse rock fragments in all canyons and on the surrounding Perito Moreno Terrace.

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阿根廷巴塔哥尼亚(西南大西洋)陆坡海底峡谷相研究
对阿根廷巴塔哥尼亚北部四个海底峡谷横断面内近期沉积物的岩性研究,以及浮游有孔虫试验和大型底底动物的研究表明,峡谷内的相变异性比峡谷之间的佩里托莫雷诺阶地要复杂得多。峡谷的相变异性受沿坡轮廓流和峡谷下重力流的共同控制。南部两个峡谷含陆源海绿石砂的河道相,与有孔虫试验含量高的砂侧相分隔。北部两个峡谷为混合沉积相,<0.1 mm含量较高,而其周围阶地缺乏类似物。它们很可能是在静止的海底环境中,由密集悬浮物的峡谷向下重力流沉积而成。具有钙质骨骼元素的附着大型底栖动物(通常是珊瑚)居住在所有峡谷和周围的Perito Moreno阶地的主要是冰或冰山漂流的粗糙岩石碎片中。
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来源期刊
Lithology and Mineral Resources
Lithology and Mineral Resources 地学-地球化学与地球物理
CiteScore
1.30
自引率
37.50%
发文量
29
审稿时长
>12 weeks
期刊介绍: Lithology and Mineral Resources is an international peer reviewed journal that publishes articles on a wide range of problems related to the formation of sedimentary rocks and ores. Special attention is given to comparison of ancient sedimentary rock and ore formation with present-day processes. The major part of the journal is devoted to comparative analysis of sedimentary processes on the continents and in oceans, as well as the genetic aspects of the formation of sedimentary and hydrothermal–sedimentary mineral resources. The journal welcomes manuscripts from all countries in the English or Russian language.
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