A shift in heavy and clay mineral provenance indicates a middle Miocene onset of a perennial sea ice cover in the Arctic Ocean

Krylov AA; Andreeva IA; Vogt C; Backman J; Krupskaya VV; Grikurov GE; Moran K; Shoji H

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A shift in heavy and clay mineral provenance indicates a middle Miocene onset of a perennial sea ice cover in the Arctic Ocean

机译：重和粘土矿物产地的变化表明北冰洋中新世中期发生了多年生海冰覆盖

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During the Arctic Coring Expedition (ACEX), a 428-m-thick sequence of Upper Cretaceous to Quaternary sediments was penetrated. The mineralogical composition of the upper 300 m of this sequence is presented here for the first time. Heavy and clay mineral associations indicate a major and consistent shift in provenance, from the Barents-Kara-western Laptev Sea region, characterized by presence of common clinopyroxene, to the eastern Laptev-East Siberian seas in the upper part of the section, characterized by common hornblende (amphibole). Sea ice originating from the latter source region must have survived at least one summer melt cycle in order to reach the ACEX drill site, if considering modern sea ice trajectories and velocities. This shift in mineral assemblages probably represents the onset of a perennial sea ice cover in the Arctic Ocean, which occurred at about 13 Ma, thus suggesting a coeval freeze in the Arctic and Antarctic regions.

机译：在北极取心探险（ACEX）期间，上白垩统至第四纪沉积物的厚度为428米。这是该序列上部300 m的矿物学组成。重矿物和粘土矿物的联系表明，物源发生了重大且持续的变化，从以常见的斜辉石存在为特征的巴伦支-卡拉-拉普捷夫海地区，到该断面上部的拉普捷夫-东西伯利亚海东部，特征为普通角闪石（amphibole）。如果考虑到现代海冰的轨迹和速度，则从后一个源区起源的海冰必须至少经历了一个夏季融化周期才能到达ACEX钻探地点。矿物组合的这种变化可能代表了北冰洋多年生海冰覆盖的开始，大约在13 Ma发生，因此表明在北极和南极地区出现了同时期冻结。

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《Paleoceanography》 |2008年第1期|共10页
作者
Krylov AA; Andreeva IA; Vogt C; Backman J; Krupskaya VV; Grikurov GE; Moran K; Shoji H;
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正文语种 eng
中图分类海洋学;
关键词
SURFACE SEDIMENTS; TRANSPORT; ENTRAINMENT; CIRCULATION; SHELF; BASIN; ASSEMBLAGES; PLEISTOCENE; PATHWAYS; PATTERNS;

机译：表面沉积物;运输;引诱;循环;层架;流域;组合物;更新世;途径;模式;

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1. A shift in heavy and clay mineral provenance indicates a middle Miocene onset of a perennial sea ice cover in the Arctic Ocean [J] . Krylov AA, Andreeva IA, Vogt C, Paleoceanography . 2008,第1期

机译：重和粘土矿物产地的变化表明北冰洋中新世中期发生了多年生海冰覆盖
2. Arctic ocean benthic foraminiferal faunal change associated with the onset of perennial sea ice in the middle miocene [J] . Kender S.E.V., Kaminski M.A. Journal of foraminiferal research . 2013,第1期

机译：北冰洋底栖有孔虫的动物区系变化与中新世常年海冰的发生有关
3. Early-Middle Miocene (17-14 Ma) Antarctic ice dynamics reconstructed from the heavy mineral provenance in the AND-2A drill core, Ross Sea, Antarctica [J] . Daniel W. Hauptvogel, Sandra Passchier Global and planetary change . 2012,第FEBa期

机译：中新世早中期（17-14 Ma），南极冰动力学是由南极罗斯海的AND-2A钻芯中的重矿物出处重建而成的
4. Impacts of the variability of second-year ice types on the decline of the Arctic perennial sea-ice cover [C] . Josefino C. COMISO International Symposium on Sea Ice . 2006

机译：第二年冰类型变异性对北极多年生海冰覆盖的衰落
5. Modelling primary production in seasonally ice-covered regions of the Arctic Ocean and its response to climate change. [D] . Lavoie, Diane. 2008

机译：模拟北冰洋季节性冰雪覆盖地区的初级生产及其对气候变化的响应。
6. Evidence for ice-ocean albedo feedback in the Arctic Ocean shifting to a seasonal ice zone [O] . Haruhiko Kashiwase, Kay I. Ohshima, Sohey Nihashi, -1

机译：北冰洋冰洋反照率反馈移至季节性冰区的证据
7. Arctic Ocean benthic foraminiferal faunae change associated with the onset of perennial sea ice in the Middle Miocene [O] . Kender S., Kaminski M.A. 2013

机译：与中新世中期多年生海冰发生有关的北冰洋底栖有孔虫动物群变化
8. Impacts of the Variability of Ice Types on the Decline of the Arctic Perennial Sea Ice Cover [R] . Comiso, Josefino C. 2005

机译：冰种变异性对北极多年生海冰覆盖度下降的影响

A shift in heavy and clay mineral provenance indicates a middle Miocene onset of a perennial sea ice cover in the Arctic Ocean

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