当前位置: X-MOL 学术J. Struct. Geol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Statistical analysis of structures commonly used to determine palaeoslopes from within mass transport deposits
Journal of Structural Geology ( IF 2.6 ) Pub Date : 2021-07-22 , DOI: 10.1016/j.jsg.2021.104421
Mérolyn Camila Naves de Lima Rodrigues 1 , Barbara Trzaskos 1 , G. Ian Alsop 2 , Fernando Farias Vesely 1 , Thammy Ellin Mottin 1 , Danielle Cristine Buzatto Schemiko 1
Affiliation  

Mass transport deposits (MTDs) contain deformation structures often that are used to determine the kinematics of palaeo-mass flows and hence the orientation of the original slope or gradient upon which the mass flow developed. When integrated with stratigraphic data, the azimuth of the palaeoslope can help elucidate the depositional evolution and palaeogeography of a region. However, most studies have defined palaeoslopes from well-exposed MTDs, which raises some questions regarding the validity of establishing palaeoslope definition where MTDs are poorly exposed. We examine MTDs of the Itararé Group (Paraná Basin), in southern Brazil, that are only partially exposed, but widely distributed both vertically and horizontally. Datasets and transport direction (palaeoflow) obtained from different structures, variable methods and multiple stratigraphic levels and geographic localities were statistically evaluated to verify the robustness of the methodology. This allow the orientation of local palaeoslope to be established for different time intervals, even from disconnected outcrops. Faults and folds, that are the main structures used to define palaeoslopes, display the greatest potential to accurately determine palaeoflow in the examined MTDs. The use of other structures such as asymmetric boudins, quarter structures and injectites, helped to clarify flow kinematics. The integration of palaeoflow data with palaeocurrent data from associated deposits give additional support for determining the orientation of the palaeoslope.



中文翻译:

常用结构的统计分析,用于确定大规模运输沉积物中的古斜坡

质量输送沉积物 (MTD) 包含变形结构,通常用于确定古质量流的运动学,从而确定质量流发展的原始坡度或梯度的方向。当与地层数据相结合时,古坡的方位角有助于阐明一个地区的沉积演化和古地理。然而,大多数研究已经从暴露良好的 MTD 定义了古斜坡,这引发了一些关于在 MTD 暴露不足的情况下建立古斜坡定义的有效性的问题。我们研究了巴西南部伊塔拉雷群(巴拉那盆地)的 MTD,这些 MTD 仅部分暴露,但在垂直和水平方向上分布广泛。从不同结构获得的数据集和传输方向(古流),对可变方法和多个地层水平和地理区域进行了统计评估,以验证该方法的稳健性。这允许在不同的时间间隔内建立当地古坡的方向,即使是从不连续的露头。断层和褶皱是用于定义古斜坡的主要结构,显示出在所检查的 MTD 中准确确定古流的最大潜力。使用其他结构,如不对称布丁、四分之一结构和注入体,有助于阐明流动运动学。古流数据与来自相关沉积物的古流数据的整合为确定古斜坡的方向提供了额外的支持。这允许在不同的时间间隔内建立当地古坡的方向,即使是从不连续的露头。断层和褶皱是用于定义古斜坡的主要结构,显示出在所检查的 MTD 中准确确定古流的最大潜力。使用其他结构,如不对称布丁、四分之一结构和注入体,有助于阐明流动运动学。古流数据与来自相关沉积物的古流数据的整合为确定古斜坡的方向提供了额外的支持。这允许在不同的时间间隔内确定当地古坡的方向,即使是从不连续的露头。断层和褶皱是用于定义古斜坡的主要结构,显示出在所检查的 MTD 中准确确定古流的最大潜力。使用其他结构,如不对称布丁、四分之一结构和注入体,有助于阐明流动运动学。古流数据与来自相关沉积物的古流数据的整合为确定古斜坡的方向提供了额外的支持。使用其他结构,如不对称布丁、四分之一结构和注入体,有助于阐明流动运动学。古流数据与来自相关沉积物的古流数据的整合为确定古斜坡的方向提供了额外的支持。使用其他结构,如不对称布丁、四分之一结构和注入体,有助于阐明流动运动学。古流数据与来自相关沉积物的古流数据的整合为确定古斜坡的方向提供了额外的支持。

更新日期:2021-07-27
down
wechat
bug