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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Rapid late Miocene rise of the Bolivian Altiplano: Evidence for removal of mantle lithosphere
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Rapid late Miocene rise of the Bolivian Altiplano: Evidence for removal of mantle lithosphere

机译：玻利维亚高原的中新世晚期快速上升：除去地幔岩石圈的证据

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摘要

The oxygen isotopic compositions of carbonates deposited in the northern Altiplano demonstrate a rapid change in late Miocene time, which we attribute to an increase in elevation. Rainfall samples over an elevation transect adjacent to the Altiplano of northern Bolivia display a systematic decrease in mean annual 8180 values and define a local 8180 vs. altitude gradient [R. Gonfiantini, M.-A. Roche, J.-C. Olivry, J.-C. Fontes, G.M. Zuppi, The altitude effect on the isotopic composition of tropical rains, Chem. Geol. 181 (2001) 147-167.], which we apply to paleo-meteoric water values determined from carbonates. Age constraints from magnetostragraphy and palcoelevation estimates suggest surface uplift of similar to 2.5 to 3.5 km occurred between similar to 10.3 Ma and 6.8 +/- 0.4 Ma, when the Altiplano rose to its current elevation. Only the removal of dense eclogitic lower crust and mantle lithosphere can generate a change of this magnitude and rapidity. This change coincides with an similar to 30% decrease in the rate of convergence between the South America and Nazea plates and the propagation of deformation into the eastern Subandean zone, which we infer to have resulted from the increase in the force per unit length applied by the elevated Andean plateau to the surrounding lowlands. (c) 2005 Elsevier B.V All rights reserved.
机译：沉积在北部高原内的碳酸盐的氧同位素组成显示出中新世晚期的快速变化，这归因于海拔升高。与玻利维亚北部高地相邻的高程横断面的降雨样本显示出系统性的年均8180值下降，并定义了局部8180对海拔梯度[R.贡菲安蒂尼（M.-A.）罗氏，J.-C。奥利弗（J.-C.丰特斯Zuppi，海拔高度对热带雨水同位素组成的影响，化学。地质181（2001）147-167。]，我们将其应用于由碳酸盐确定的古水含量。磁地层学和palcoelevation估计的年龄限制表明，当Altiplano上升到当前高度时，在大约10.3 Ma和6.8 +/- 0.4 Ma之间发生了大约2.5至3.5 km的表面隆起。只有去除致密的表层下部地壳和地幔岩石圈才能产生这种幅度和速度的变化。这种变化与南美板块和纳西亚板块之间的收敛速度下降约30％，以及变形向东部苏南地区的传播有关，我们推测这是由于高架的安第斯高原到周围的低地。 （c）2005 Elsevier B.V保留所有权利。

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