Late Eocene–Pliocene basin evolution in the Eastern Cordillera of northwestern Argentina (25°–26°S): regional implications for Andean orogenic wedge development
Late Eocene–Pliocene basin evolution in the Eastern Cordillera of northwestern Argentina (25°–26°S): regional implications for Andean orogenic wedge development
复制标题
阿根廷西北部东科迪勒拉山脉晚始新世-上新世盆地演化（25°–26°S）：对安第斯造山楔发育的区域影响
DOI：
10.1111/j.1365-2117.2011.00519.x
复制
发表时间：
2012
期刊：
影响因子：
3.2
通讯作者：
G. Gehrels
中科院分区：
文献类型：
--
作者：
B. Carrapa;S. Bywater‐Reyes;P. DeCelles;E. Mortimer;G. Gehrels
阿根廷安第斯前陆盆地的一些重要方面仍然缺乏制约，例如变形对沉积的影响，前陆盆地沉积区新生代沉积单元的沉积，沉积物来源和排放如何根据构造演变，以及沉积物堆积的厚度。来自阿根廷西北部东科迪勒拉（Pucará-Angastaco和La Viña地区）始新世-上新世沉积地层的锆石U-Pb年代学数据提供了一个始新世（约2000年）。38 Ma）最大沉积年龄为Quebrada de los Colorados组。沉积学和物源数据揭示了盆地的历史，这是最好的解释范围内的一个不断发展的前陆盆地系统继承的古地形的影响。Quebrada de los Colorados地层代表了远端至近端前渊沉积带的沉积。在约4000米处发育一个角度不整合面。14 Ma和上覆Angastaco组（中新世下部至上部）的粗粒近端特征表明沉积在楔顶沉积带中。Palo Pintado组（上中新世）沉积过程中的轴向排水表明是一种河流-湖泊山间环境。按ca. 4 Ma，在圣费利佩组沉积期间，Angastaco地区因Sierra de los Colorados山脉向东隆起而在结构上被隔离。总的来说，东科迪勒拉沉积记录是一致的连续前陆盆地系统，通过该地区从始新世晚期到中新世中期的时间迁移。到中新世中期，该地区位于地形复杂的楔顶沉积带内，受到厚皮变形和白垩纪裂谷结构重新活化的影响。始新世Quebrada del los Colorados地层与前渊沉积带的关联意味着该区域内的前始新世地层（圣巴巴拉亚群）应代表更远的前陆沉积。
Important aspects of the Andean foreland basin in Argentina remain poorly constrained, such as the effect of deformation on deposition, in which foreland basin depozones Cenozoic sedimentary units were deposited, how sediment sources and drainages evolved in response to tectonics, and the thickness of sediment accumulation. Zircon U‐Pb geochronological data from Eocene–Pliocene sedimentary strata in the Eastern Cordillera of northwestern Argentina (Pucará–Angastaco and La Viña areas) provide an Eocene (ca. 38 Ma) maximum depositional age for the Quebrada de los Colorados Formation. Sedimentological and provenance data reveal a basin history that is best explained within the context of an evolving foreland basin system affected by inherited palaeotopography. The Quebrada de los Colorados Formation represents deposition in the distal to proximal foredeep depozone. Development of an angular unconformity at ca. 14 Ma and the coarse‐grained, proximal character of the overlying Angastaco Formation (lower to upper Miocene) suggest deposition in a wedge‐top depozone. Axial drainage during deposition of the Palo Pintado Formation (upper Miocene) suggests a fluvial‐lacustrine intramontane setting. By ca. 4 Ma, during deposition of the San Felipe Formation, the Angastaco area had become structurally isolated by the uplift of the Sierra de los Colorados Range to the east. Overall, the Eastern Cordillera sedimentary record is consistent with a continuous foreland basin system that migrated through the region from late Eocene through middle Miocene time. By middle Miocene time, the region lay within the topographically complex wedge‐top depozone, influenced by thick‐skinned deformation and re‐activation of Cretaceous rift structures. The association of the Eocene Quebrada del los Colorados Formation with a foredeep depozone implies that more distal foreland deposits should be represented by pre‐Eocene strata (Santa Barbara Subgroup) within the region.
影响因子：
4.2
作者：
Deeken, Anke;Sobel, Edward R.;Strecker, Manfred R.
通讯作者：
Strecker, Manfred R.