Neogene Uplift and Magmatism of Anatolia: Insights From Drainage Analysis and Basaltic Geochemistry
Neogene Uplift and Magmatism of Anatolia: Insights From Drainage Analysis and Basaltic Geochemistry
复制标题
安纳托利亚的新近纪隆升和岩浆作用：来自排水分析和玄武岩地球化学的见解
DOI：
--
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Nicky White
中科院分区：
文献类型：
--
作者：
F. McNab;P. Ball;M. Hoggard;Nicky White
人们一致认为，地幔动力学在新近纪时期安纳托利亚地形的形成和维持中发挥了作用。然而，关于俯冲带和软流圈过程的相对重要性存在争议。关键问题涉及区域隆起的开始和原因、岩石圈板块的厚度以及对流地幔内是否存在温度和/或成分异常。在这里，我们通过分析和建模两组不同的观察结果来解决这些相互关联的问题。首先，收集了 1,844 条纵向河流剖面的排水清单。通过对该数据库进行反演，通过独立校准，最大限度地减少观测到的河流剖面与计算得出的河流剖面之间的不拟合，来计算新近纪区域隆升随时间和空间的变化。我们的结果表明，区域隆升始于东部 20 Ma，并向西传播。其次，我们建立了玄武岩地球化学分析数据库。使用两种不同的方法对该数据库进行定量建模，以确定整个安纳托利亚软流圈融化的深度和程度。我们的结果表明，在地幔潜在温度高达 1400°C 的情况下，融化发生在浅至 60 公里的深度。有证据表明东部气温较高，这与板下横波速度异常的模式一致。我们的综合结果与等静压和导纳分析一致，表明减薄的安纳托利亚岩石圈下方软流圈温度升高在生成和维持区域动态地形和玄武岩岩浆作用中发挥了首要作用。
It is agreed that mantle dynamics have played a role in generating and maintaining the elevated topography of Anatolia during Neogene times. However, there is debate about the relative importance of subduction zone and asthenospheric processes. Key issues concern onset and cause of regional uplift, thickness of the lithospheric plate, and the presence/absence of temperature and/or compositional anomalies within the convecting mantle. Here, we tackle these interlinked issues by analyzing and modeling two disparate suites of observations. First, a drainage inventory of 1,844 longitudinal river profiles is assembled. This database is inverted to calculate the variation of Neogene regional uplift through time and space by minimizing the misfit between observed and calculated river profiles subject to independent calibration. Our results suggest that regional uplift commenced at 20 Ma in the east and propagated westward. Second, we have assembled a database of geochemical analyses of basaltic rocks. Two different approaches have been used to quantitatively model this database with a view to determining the depth and degree of asthenospheric melting across Anatolia. Our results suggest that melting occurs at depths as shallow as 60 km in the presence of mantle potential temperatures as high as 1400°C. There is evidence that temperatures are higher in the east, consistent with the pattern of subplate shear wave velocity anomalies. Our combined results are consistent with isostatic and admittance analyses and suggest that elevated asthenospheric temperatures beneath thinned Anatolian lithosphere have played a first‐order role in generating and maintaining regional dynamic topography and basaltic magmatism.
登录
查看更多内容
影响因子：
3.4
作者：
R. Kind;T. Eken;F. Tilmann;F. Sodoudi;T. Taymaz;F. Bulut;X. Yuan;B. Can;Felix Schneider
通讯作者：
R. Kind;T. Eken;F. Tilmann;F. Sodoudi;T. Taymaz;F. Bulut;X. Yuan;B. Can;Felix Schneider
影响因子：
3.9
作者：
England, Philip;Houseman, Gregory;Nocquet, Jean-Mathieu
通讯作者：
Nocquet, Jean-Mathieu
影响因子：
5.2
作者：
Colli, L.;Ghelichkhan, S.;Bunge, H. -P.
通讯作者：
Bunge, H. -P.
影响因子：
4.9
作者：
Ballato, Paolo;Uba, Cornelius E.;Tabatabaei, Saeid H.
通讯作者：
Tabatabaei, Saeid H.
影响因子：
5.3
作者：
Gibson, S. A.;Geist, D.
通讯作者：
Geist, D.