Constraints on the paleoelevation history of the Eastern Cordillera of Colombia from its palynological record
Constraints on the paleoelevation history of the Eastern Cordillera of Colombia from its palynological record
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哥伦比亚东部科迪勒拉古海拔历史的孢粉学记录的制约
DOI：
10.1130/ges02328.1
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发表时间：
2021
期刊：
影响因子：
2.5
通讯作者：
Pérez-Angel, Lina C.
中科院分区：
文献类型：
--
作者：
Molnar, Peter;Pérez-Angel, Lina C.
我们试图客观地评估来自Sabana de bogot<e:1>的化石花粉组合是否需要自6-3 Ma以来约2000 m的地表抬升。我们依据的是最近公布的植物海拔范围，这些植物的花粉化石是在萨巴纳波哥大<e:1> 2000-2500米高的地方发现的。化石植物的海拔范围没有重叠，这表明这些范围可能太窄了。通过对这些海拔范围按相应化石花粉的百分比加权并求和，我们估计了过去海拔的概率密度函数。这些过去海拔高度的概率分布与现在的海拔高度重叠，因此，由于花粉沉积，不需要地表隆起。化石花粉组合包括一些我们不知道现今海拔范围的植物类群的花粉，因此，随着海拔分布的更完整的知识，应该得到更严格的海拔限制。最古老的组合，位于萨巴纳德波哥大<e:1>南部边缘的Tequendama，被认为是在16到6 Ma之间，是最不受限制的。虽然我们的分析表明，自花粉沉积以来，海拔高度没有变化，但我们认为，自15 Ma以来，海拔高度增加了1000-2000米，这与东部科迪勒拉的向外生长是可能的，也是一致的。
We attempted to make an objective assessment of whether fossil pollen assemblages from the Sabana de Bogotá require surface uplift of ~2000 m since 6–3 Ma, as has been argued. We relied on recently published elevation ranges of plants for which fossil pollen has been found in sites 2000–2500 m high in the Sabana de Bogotá. The elevation ranges of fossil plants do not overlap, suggesting that those ranges may be too narrow. By weighting these elevation ranges by percentages of corresponding fossil pollen and summing them, we estimated probability density functions for past elevations. These probability distributions of past elevations overlap present-day elevations and therefore do not require surface uplift since deposition of the pollen. Fossil pollen assemblages include pollen from some plant taxa for which we do not know present-day elevation ranges, and therefore, with a more complete knowledge of elevation distributions, tighter constraints on elevations should be obtainable. The elevation of the oldest assemblage, from Tequendama, which lies at the southern edge of the Sabana de Bogotá and is thought to date from 16 to 6 Ma, is least well constrained. Although our analysis permits no change in elevation since the pollen was deposited, we consider 1000–2000 m of elevation gain since 15 Ma to be likely and consistent with an outward growth of the Eastern Cordillera.
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影响因子：
3.7
作者：
L. Pérez‐Angel;J. Sepúlveda;P. Molnar;C. Montes;B. Rajagopalan;K. Snell;C. González‐Arango;N. Dildar
通讯作者：
L. Pérez‐Angel;J. Sepúlveda;P. Molnar;C. Montes;B. Rajagopalan;K. Snell;C. González‐Arango;N. Dildar
影响因子：
3.9
作者：
A. Kershaw;H. Nix
通讯作者：
A. Kershaw;H. Nix
影响因子：
4.9
作者：
Bande, Alejandro;Horton, Brian K.;Stockli, Daniel F.
通讯作者：
Stockli, Daniel F.
DOI：
10.1144/sp377.5
发表时间：
2013-01-01
期刊：
THICK-SKIN-DOMINATED OROGENS: FROM INITIAL INVERSION TO FULL ACCRETION
影响因子：
--
作者：
Bayona, German;Cardona, Agustin;Valencia, Victor
通讯作者：
Valencia, Victor
影响因子：
3.5
作者：
A. Mora;B. Horton;Andrés Mesa;J. Rubiano;R. Ketcham;M. Parra;Vladimir Blanco;Diego Garcia;D. Stockli
通讯作者：
A. Mora;B. Horton;Andrés Mesa;J. Rubiano;R. Ketcham;M. Parra;Vladimir Blanco;Diego Garcia;D. Stockli