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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Late Miocene to Plio-Pleistocene volcanic and paleoenvironmental history of the Cerro Domo and Ventisqueros Mesa area, northwest James Ross Island, northern Antarctic Peninsula
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Late Miocene to Plio-Pleistocene volcanic and paleoenvironmental history of the Cerro Domo and Ventisqueros Mesa area, northwest James Ross Island, northern Antarctic Peninsula

机译：后期内科对Plio-pleistocene火山和古环境历史的Cerro Domo和Ventisqueros Mesa地区，西北詹姆斯罗斯岛，北南极半岛

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We present the description and interpretation of a James Ross Island Volcanic Group (JRIVG) succession around the Cerro Domo and Ventisqueros Mesa area. Our aim is to reconstruct the volcanic evolution and provide new palaeoenvironmental information for the northwest sector of James Ross Island, northern Antarctic Peninsula. We present representative stratigraphic logs that are combined with new chronological constraints provided by Ar-40/Ar-39 ages and Sr-87/Sr-86 isotope analyses that demonstrate a record of the late Miocene to earliest Pleistocene. The first volcanic activity registered is associated with tuff cone deposits that resulted from marine hydromagmatic eruptions, close to 6.18 +/- 0.14 Ma. Subsequently, lodgement till deposits record a grounded glacial advance. Overlying the glacigenic deposits, fossil-bearing sediments record a marine or glacimarine environment following the ice sheet retreat, and an Sr-87/Sr-86 age of 6.02 (+0.09, -0.09) Ma dates ice-poor conditions. A lava-fed delta system, which yields an age of 5.37 +/- 0.12 Ma, prograded over the previous deposits. Stacked pillow lavas, curvy columnar-jointed basalts and subaerial tabular lavas, with a 4.9 +/- 0.10 Ma age, were emplaced after the lava-fed delta deposition. Another lava-fed delta located to the north of the previously volcanic units yielded an age of 3.57 +/- 0.19 Ma. A glacial pavement carved into the top of these deposits records a second ice advance in the area. The final volcanic activity emplaced Cerro Domo, a large volcanic edifice which was the centre of explosive hydromagmatic eruptions. The presence of pristine, articulated bivalves in life position within the lower volcanic deposits of Cerro Domo, together with an Sr-87/Sr-86 age of 3.16 (+0.59, -0.43) Ma, are strong indicators of a marine environment and suggest ice-poor "interglacial" conditions at this time. Dykes cutting the volcanic deposits of Cerro Domo and considered coeval with the eruptions afford ages of 2.62 +/- 0.08 and 2.72 +/- 0.09 Ma. Our results provide new insights on the volcanic and glaciation history of James Ross Island, as well as supporting marine, ice-poor conditions around similar to 6 Ma, and near or right before the Plio-Pleistocene boundary, between similar to 3.2 and similar to 2.6 Ma. (C) 2021 Elsevier B.V. All rights reserved.
机译：我们在Cerro Domo和Ventisqueros Mesa地区展示了詹姆斯罗斯岛火山集团（Jrivg）继任的描述和解释。我们的目标是重建火山的演变，为南北南极半岛詹姆斯罗斯岛西北部门提供新的古环境信息。我们提出了代表性地层日志，与AR-40 / AR-39年龄和SR-87 / SR-86同位素分析提供的新的时间规约组合，其证明了最早的新生素的记录。登记的第一个Volcanic活动与由海洋水管爆发引起的牙龈锥沉积物相关，接近6.18 +/- 0.14 mA。随后，寄存到沉积物记录接地的冰川前进。覆盖着冰川沉积物，化石沉积物在冰盖撤退后记录了海洋或甘蔗素环境，SR-87 / SR-86岁6.02（+0.09，-0.09）MA日期是冰差的条件。熔岩喂食赛雷达系统，它的年龄为5.37 +/- 0.12 mA，促进以前的沉积物。熔岩喂食三角洲沉积后，堆叠枕头熔岩，曲面柱状 - 关节玄武岩和子系统表格熔岩，在4.9 +/- 0.10 mA时代。位于以前火山单位北部的另一个熔岩喂食三角洲产生了3.57 +/- 0.19 mA的年龄。雕刻到这些存款顶部的冰川路面记录了该地区的第二次冰进步。最终火山活动挖出了Cerro Domo，这是一个大的火山大厦，是爆炸性水肿爆发的中心。在Cerro Domo的下火山沉积物中的生命位置存在原始，铰接性偏见，以及SR-87 / SR-86岁的3.16（+0.59，-0.43）MA，是海洋环境的强大指标，并提出此时冰差“中间夹岩”条件。堤坝切割塞罗米多的火山沉积物，并考虑与爆发的枝条，其爆发为2.62 +/- 0.08和2.72 +/- 0.09 mA。我们的结果为詹姆斯罗斯岛的火山和冰川历史提供了新的见解，以及支持海洋，冰差的条件，与6 mA相似，在Plio-Pleistocene边界之间的近或右边，与3.2之间相似，类似于2.6 mA。 （c）2021 elestvier b.v.保留所有权利。

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