Andean Mountain Building and Foreland Basin Evolution During Thin‐ and Thick‐Skinned Neogene Deformation (32–33°S)
Andean Mountain Building and Foreland Basin Evolution During Thin‐ and Thick‐Skinned Neogene Deformation (32–33°S)
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新近纪薄皮和厚皮变形期间的安第斯山脉建造和前陆盆地演化（南纬32°至33°）
DOI：
10.1029/2019tc005838
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发表时间：
2020
期刊：
影响因子：
4.2
通讯作者：
Orozco, Paola
中科院分区：
文献类型：
--
作者：
Mackaman‐Lofland, Chelsea;Horton, Brian K.;Fuentes, Facundo;Constenius, Kurt N.;Ketcham, Richard A.;Capaldi, Tomas N.;Stockli, Daniel F.;Ammirati, Jean‐Baptiste;Alvarado, Patricia;Orozco, Paola
中安第斯山脉南部在新近纪俯冲变化中记录了弧后缩短、盆地演化和岩浆弧迁移。在31-33°S，在现代平板段之上，薄皮和厚皮前陆缩短、基底相关的主要科迪勒拉的发掘以及下地壳腹地增厚之间的时空联系仍然没有得到很好的解决。我们将新的逆冲板和新近纪前陆盆地的地质年代学和热年代学数据与构造、沉积学和被动地震结果相结合，重建了发掘历史，并评估了构造域之间潜在的几何联系。Manantiales盆地火山层的40Ar/39Ar年龄和同造山碎屑沉积物的锆石U - Pb年龄将同造山沉积的最小持续时间限制在~ 22-14 Ma。碎屑锆石年龄分布记录了~15 Ma前腹地逆冲片的序次拆顶，随后是变形锋向东（克拉通方向）推进，西部沉积源关闭，在~14 Ma时由河流沉积向冲积扇沉积转变。Apatite (U - Th)/He冷却年龄证实了基底相关构造块体的快速挖掘和盆地划分，时间约为14-5 Ma，与Manantiales相和物源转移的时间一致，与先前在东部前陆发现的薄皮缩短和挖掘的同期（~ 12-9 Ma）一致。晚中新世-上新世（~ 8-2 Ma）沿智利-阿根廷边界的冷却时代指向安第斯造山运动晚期的腹地隆起。最后，地壳结构的地球物理约束和低温热时测量结果与跨越弧后域的薄皮和厚皮杂化的变异体相一致。
The southern Central Andes recorded retroarc shortening, basin evolution, and magmatic arc migration during Neogene changes in subduction. At 31–33°S, above the modern flat‐slab segment, spatial and temporal linkages between thin‐ and thick‐skinned foreland shortening, basement‐involved exhumation of the main Cordillera, and lower‐crustal hinterland thickening remain poorly resolved. We integrate new geochronological and thermochronological data for thrust sheets and Neogene foreland basin fill with structural, sedimentological, and passive seismic results to reconstruct the exhumation history and evaluate potential geometric linkages across structural domains.40Ar/39Ar ages for volcanic horizons and zircon U‐Pb ages for synorogenic clastic deposits in the Manantiales Basin constrain the minimum duration of synorogenic sedimentation to ~22–14 Ma. Detrital zircon age distributions record sequential unroofing of hinterland thrust sheets until ~15 Ma, followed by eastward (cratonward) advance of the deformation front, shutoff of western sediment sources, and a shift from fluvial to alluvial fan deposition at ~14 Ma. Apatite (U‐Th)/He cooling ages confirm rapid exhumation of basement‐involved structural blocks and basin partitioning by ~14–5 Ma, consistent with the timing of the Manantiales facies and provenance shifts and a coeval (~12–9 Ma) pulse of thin‐skinned shortening and exhumation previously identified in the eastern foreland. Late Miocene–Pliocene (~8–2 Ma) cooling ages along the Chile‐Argentina border point to hinterland uplift during the latest stage of Andean orogenesis. Finally, geophysical constraints on crustal architecture and low‐temperature thermochronometry results are compatible with a hybrid thin‐ and thick‐skinned décollement spanning retroarc domains.
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