Constraining late paleozoic ice extent in the Paganzo basin of western Argentina: Provenance of the lower Paganzo group strata
Constraining late paleozoic ice extent in the Paganzo basin of western Argentina: Provenance of the lower Paganzo group strata
复制标题
限制阿根廷西部帕甘佐盆地晚古生代冰范围：下帕甘佐群地层的来源
DOI：
10.1016/j.jsames.2020.102899
复制
发表时间：
2021
影响因子：
1.8
通讯作者：
Moxness, Levi D.
中科院分区：
文献类型：
--
作者：
Pauls, Kathryn N.;Isbell, John L.;Limarino, C. Oscar;Alonso-Murauga, Pablo J.;Malone, David H.;Schencman, L. Jazmin;Colombi, Carina E.;Moxness, Levi D.
冈瓦纳西缘在帕甘佐盆地及其邻近地区的地层中记录了中石炭世（Visean- Bashkirian）冰川作用的证据。以往的研究主要集中在限制冰流方向和概括盆地冰川的范围和分布上。然而，在盆地西部的关达科尔组和东部的Malanzán组沉积时期，冰川作用的位置和范围以及冰川中心的位置都存在不确定性。了解这些地层以及导致这些地层沉积的条件，对于了解晚古生代冰河时期冈瓦纳西部边缘的冰川作用范围具有重要意义。为了完善冰川历史，我们提出了新的古潮流、相，并对先前发表的和一个新的碎屑锆石年代学数据集进行了比较分析。总之，这些数据为沉积物扩散模式和盆地内的冰川中心提供了新的见解。我们的数据表明，这两个单元都是在整个盆地发生的寒冷气候条件下沉积的，但冰川仅限于盆地的西部。对这两个地层的相分析表明，这两个单元的沉积环境非常不同：西部为冰川和冰川海洋环境，东部为非冰川冲积、冲积扇和湖泊和/或海洋环境。碎屑锆石年代学表明，这两个地层具有各自的局部物源特征。此外，碎屑锆石群暗示了不连通的沉积中心。在Huaco， Guandacol的冰川流朝向西北（即313°），似乎是从含有与Sierra de Valle f<s:1> rtil和Sierra de Pie de Palo ranges相似的锆石年龄群的隆起中流出的。在Olta-Malanzán古山谷系统中，在sierra de Chepes地区，排水沿着山谷壁和山谷轴线（即南部和西南方向），有限的沉积物来自古山谷系统之外的东部。从盆地西部其他已知冰川位置报告的古流量测量结果反映了一种径向流模式，在深切山谷内和远离深切山谷，清楚地指向Cuyania和Precordilleran地块内的高地冰川中心。
The western margin of Gondwana records evidence of mid-Carboniferous glaciation (Visean- Bashkirian) in the strata of the Paganzo Basin and adjacent areas. Previous studies focused on constraining the orientations of ice flow and generalizing the extent and occurrence of glacial ice in the basin. However, there is uncertainty occurs concerning the location and extent of glaciation and the locations of glacial centers during deposition of the Guandacol Formation located in the western portion and the time correlative Malanzán Formation in the eastern parts of the basin respectively. Understanding these strata and the conditions that led to the deposition of these strata has important implications for understanding glaciation extent along the western margin of Gondwana during the late Paleozoic ice age. To refine the glaciation history, we present new paleocurrent, facies, and a comparative analysis of previously published and one new detrital zircon geochronology data set. Together, these data provide new insight into sediment dispersal patterns and glacial centers within the basin. Our data indicate that both units were deposited under cold climatic conditions that occurred across the entire basin, but that glaciers were restricted to the western portion of the basin. The facies analysis for both formations indicates very different depositional environments for the two units: glacial and glaciomarine environments in the west and non-glacial alluvial, alluvial fan and lacustrine and/or marine environments in the east. Detrital zircon geochronology indicates separate localized provenance signatures for the two formations. Furthermore, the detrital zircon populations allude to disconnected depositional centers. At Huaco, glacial flow in the Guandacol is oriented toward the northwest (i.e. 313°) and appears to be draining from an uplift that contains similar zircon age populations as the Sierra de Valle Fértil and Sierra de Pie de Palo ranges. In the Olta-Malanzán paleovalley system, drainage was off valley walls and down the valley axis (i.e. south and southwest) within the Sierras de Chepes region with limited sediment sourced from the east just beyond the paleovalley system. Paleoflow measurements reported from other known glacial localities along the western portion of the basin reflect a radial flow pattern within and away from deeply incised valleys that clearly point to upland glacial centers within the Cuyania and Precordilleran terranes.
登录
查看更多内容
阿根廷中部普雷迪勒拉早古生代对接的时间限制
DOI：
--
发表时间：
1998
期刊：
Geological Society Special Publication
影响因子：
--
作者：
V. Ramos;R. D. Dallmeyer;G. Vujovich
通讯作者：
G. Vujovich
帕甘佐盆地和里奥布兰科盆地（阿根廷西北部）的上石炭统冰后海侵：相和地层意义
DOI：
--
发表时间：
2002
期刊：
影响因子：
--
作者：
C. Limarino;S. N. Césari;L. Net;S. Marenssi;Raul Gutierrez;Alfonsina Tripaldi
通讯作者：
Alfonsina Tripaldi
中晚寒武世拉普拉塔克拉通与冈瓦纳西南部的对接：来自安巴托山脉和贝拉斯科山脉（阿根廷潘皮纳斯山脉）的 U-Pb SHRIMP 碎屑锆石年龄的年龄限制
影响因子：
2.7
作者：
S. Verdecchia;C. Casquet;E. Baldo;R. Pankhurst;C. Rapela;M. Fanning;C. Galindo
通讯作者：
C. Galindo
阿根廷前记录地体参与法马提尼运动带：U-Pb SHRIMP 和来自 Sierra de Pie de Palo 的变质证据
DOI：
--
发表时间：
2001
期刊：
影响因子：
--
作者：
C. Casquet;E. Baldo;R. Pankhurst;C. Rapela;C. Galindo;C. Fanning;J. Saavedra
通讯作者：
J. Saavedra
不同范围内叶状复合体的地层学和沉积结构：来自阿根廷晚古生代帕甘佐盆地的例子
DOI：
--
发表时间：
2019
期刊：
影响因子：
--
作者：
Claus Fallgatter;Victoria Buso;P. Paim;J. Milana
通讯作者：
J. Milana