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首页> 外文期刊>Geosciences >Stratigraphy, Petrography and Grain-Size Distribution of Sedimentary Lithologies at Cahuachi (South Peru): ENSO-Related Deposits or a Common Regional Succession?
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Stratigraphy, Petrography and Grain-Size Distribution of Sedimentary Lithologies at Cahuachi (South Peru): ENSO-Related Deposits or a Common Regional Succession?

机译：Cahuachi（南秘鲁）沉积岩性的地层学，岩相学和粒度分布：与ENSO有关的矿床还是共同的区域性继承？

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Several central Andean pre-Columbian sites struck by hydrogeological disasters due to El Ni?o-Southern Oscillation (ENSO) events are reported in the literature. The mainstream explanation for the decline and demise of Cahuachi ( pampa of Nazca, south Peru) implies the damage and burial of such a ceremonial center as a consequence of two catastrophic river floods, which occurred around 600 CE and 1000 CE, respectively. Therefore, geological studies at Cahuachi are mandatory with regard to both the correlations of ENSO-related deposits (“event-strata”) among different Peruvian sites and the assessment of the millennium-scale climate variability. In particular, the latter is crucial to evaluate the environmental and economic consequences due to the incoming fluctuations of ENSO. In this paper, stratigraphic, grain-size distribution, and petrographic investigations on a sedimentary section exposed close to one of the main temples of Cahuachi are reported. They represent the first test for the current mainstream explanation. The preliminary finding indicates that the studied stratigraphic interval may belong to the common regional succession of the pampa of Nazca rather than the ENSO-related deposits described in the literature. However, further geological research will be necessary to unravel this issue in more detail.
机译：文献中报道了因厄尔尼诺-南方涛动（ENSO）事件而遭受水文地质灾害袭击的安第斯中部哥伦布前中部几个遗址。 Cahuachi（秘鲁南部纳斯卡的南美大草原）的衰落和消亡的主流解释是，由于两次灾难性的河水洪水分别造成了约600 CE和1000 CE的破坏和埋葬了这种礼仪中心。因此，对于秘鲁不同地点之间ENSO相关沉积物（“事件地层”）的相关性以及对千年尺度气候变异性的评估，在Cahuachi进行地质研究是必不可少的。特别是，后者对于评估由于ENSO的传入波动而造成的环境和经济后果至关重要。本文报道了在靠近卡瓦奇主要庙宇之一的裸露沉积剖面上的地层，粒度分布和岩相学研究。它们代表了当前主流解释的第一个考验。初步发现表明，研究的地层间隔可能属于纳斯卡岩浆的常见区域演替，而不是文献中描述的ENSO相关沉积物。但是，需要进一步的地质研究来更详细地阐明这个问题。

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