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Carbonate fabric diversity and environmental heterogeneity in the late Mesoproterozoic Era
Geological Magazine ( IF 2.3 ) Pub Date : 2021-05-25 , DOI: 10.1017/s0016756821000406 Linda C. Kah , Julie K. Bartley
Geological Magazine ( IF 2.3 ) Pub Date : 2021-05-25 , DOI: 10.1017/s0016756821000406 Linda C. Kah , Julie K. Bartley
Time-distinctive features within carbonate rocks, specifically the presence, abundance and distribution of stromatolites, molar-tooth fabric and specific morphologies of marine cement, have been identified as potential indicators of global-scale changes in the chemistry of marine environments. Recently, Cantine et al. (2019) introduced a database approach seeking to quantify spatial and temporal patterns in these carbonate features through the Precambrian. Despite the coarse temporal scale, results support earlier inferences of temporal change in carbonate sedimentation. Here, we use original field notes to dissect late Mesoproterozoic (˜1.3 to 1.0 Ga) carbonate strata at a high resolution, analyse time-distinctive carbonate fabrics within a database context and compare sedimentological patterns within this narrow time range to observations of the Proterozoic as a whole. Late Mesoproterozoic strata contain a variety of features (e.g. stromatolites, seafloor precipitates, herringbone carbonate, molar-tooth carbonate), often in close spatial and temporal proximity, that are commonly considered to be temporally restricted during the Precambrian. The spatial distribution of such features within Mesoproterozoic basins demonstrates the importance of recognizing even rare occurrences of time-distinctive facies and permits inference of environmental drivers that may have interacted to affect carbonate precipitation. Such spatial variability reflects a subtle division of Mesoproterozoic carbonate platform environments driven by globally high sea level, elevated carbonate saturation and a low-oxygen water column. The heterogeneous, mosaic nature of environments appears to be a hallmark of Mesoproterozoic carbonate sedimentation and emphasizes the importance of these basins in understanding longer-term trends in carbonate deposition.
中文翻译:
中元古代晚期碳酸盐组构多样性与环境异质性
碳酸盐岩中的时间显着特征,特别是叠层石的存在、丰度和分布、臼齿组织和海洋水泥的特定形态,已被确定为全球范围内海洋环境化学变化的潜在指标。近日,康提等。 (2019) 引入了一种数据库方法,旨在通过前寒武纪量化这些碳酸盐特征的空间和时间模式。尽管时间尺度粗略,但结果支持早期对碳酸盐沉积时间变化的推断。在这里,我们使用原始现场笔记以高分辨率剖析晚中元古代(~1.3 至 1.0 Ga)碳酸盐地层,在数据库环境中分析具有时间特征的碳酸盐织物,并将这个狭窄时间范围内的沉积学模式与元古代的观测结果进行比较整个。晚中元古代地层包含多种特征(例如叠层石、海底沉淀物、人字形碳酸盐、臼齿碳酸盐),通常在空间和时间上非常接近,通常被认为在前寒武纪期间受到时间限制。中元古代盆地内这些特征的空间分布证明了识别甚至罕见的具有时间特征的相的重要性,并允许推断可能相互作用以影响碳酸盐降水的环境驱动因素。这种空间变化反映了由全球高海平面、碳酸盐饱和度升高和低氧水柱驱动的中元古代碳酸盐台地环境的微妙划分。环境的异质镶嵌性质似乎是中元古代碳酸盐沉积的标志,并强调了这些盆地在了解碳酸盐沉积的长期趋势方面的重要性。
更新日期:2021-05-25
中文翻译:
中元古代晚期碳酸盐组构多样性与环境异质性
碳酸盐岩中的时间显着特征,特别是叠层石的存在、丰度和分布、臼齿组织和海洋水泥的特定形态,已被确定为全球范围内海洋环境化学变化的潜在指标。近日,康提