当前位置: X-MOL 学术Quat. Sci. Rev. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Glacial-interglacial sedimentation and paleocirculation at the Northwind Ridge, western Arctic Ocean
Quaternary Science Reviews ( IF 3.2 ) Pub Date : 2021-03-15 , DOI: 10.1016/j.quascirev.2021.106882
Rong Wang , Leonid Polyak , Weiyan Zhang , Xiaoguo Yu , Liming Ye , Linsen Dong , Yanguang Liu , Weiguo Wang , Bernhard Diekmann

Sediment cores from the Northwind Ridge north of the Arctic Chukchi-Alaskan margin were analyzed for a suite of stratigraphic and provenance proxies. Based on the correlation to previously studied regional records, cores under study present sedimentary environments of Marine Isotope Stages (MIS) 1–11 (∼0.4 Ma) on millennial time scales. Contrasting glacial-interglacial conditions and provenance were characterized by means of clay-mineral and geochemical (elemental and isotopic) proxies along with grain size. Interglacial environments are interpreted as sea-ice dominated, with pre-Holocene sediment transported mostly from the East Siberian to Chukchi-Alaskan margin. In comparison with the recent conditions, this pattern suggests a stronger Transpolar Drift expanding into the Canada Basin at the expense of the Beaufort Gyre, or stronger along-shelf currents. Glacial intervals prior to MIS4 have a predominantly North American signature with carbonaceous or terrigenous source rocks. Carbonaceous inputs marked by Ca peaks are tracked to the western Canadian Arctic Archipelago eroded by the Laurentide Ice Sheet (LIS). Terrigenous sources (Zr peaks) are likely related to areas impacted by the Innuitian Ice Sheet and/or the LIS Mackenzie ice stream. MIS 4 and 2 intervals have a different composition with the Siberian/Chukchi rather than North American provenance. A stronger winnowing indicated by grain size in the glacial intervals suggests a stronger mid-depth circulation. Study results provide new boundary conditions for modeling paleocirculation and glaciations in the western Arctic Ocean.



中文翻译:

北冰洋西部北风脊的冰间冰期沉积和古环流

分析了北极楚科奇-阿拉斯加边界以北的罗斯文岭的沉积岩心,获得了一套地层学和物源代用品。基于与先前研究的区域记录的相关性,正在研究的岩心在千禧年尺度上呈现了海洋同位素阶段(MIS)1-11(〜0.4 Ma)的沉积环境。对比冰河间条件和物源通过粘土矿物和地球化学(元素和同位素)代理以及晶粒尺寸来表征。冰川间环境被解释为以海冰为主,全新世前的沉积物大部分从西伯利亚东部运到楚科奇-阿拉斯加边缘。与最近的情况相比,这种模式表明更强的跨极漂流扩展到了加拿大盆地,但代价是Beaufort Gyre,或更大的沿架电流。MIS4之前的冰川间隔主要是北美特征,其含碳质或陆源性烃源岩。由Ca峰标记的碳质输入被追踪到加拿大西部北极群岛,这些岩石被Laurentide冰盖(LIS)侵蚀了。陆源(Zr峰值)可能与受到因纽特人冰盖和/或LIS Mackenzie冰流影响的地区有关。MIS 4和2间隔与西伯利亚/楚科奇州的构成不同,而不是北美出处。在冰川间隔内,颗粒大小表明风越强,表明中深层环流越强。研究结果为北冰洋西部古环流和冰川的模拟提供了新的边界条件。MIS4之前的冰川间隔主要是北美特征,其含碳质或陆源性烃源岩。由Ca峰标记的碳质输入被追踪到加拿大西部北极群岛,这些岩石被Laurentide冰盖(LIS)侵蚀了。陆源(Zr峰值)可能与受到因纽特人冰盖和/或LIS Mackenzie冰流影响的地区有关。MIS 4和2间隔与西伯利亚/楚科奇州的构成不同,而不是北美出处。在冰川间隔内,颗粒大小表明风越强,表明中深层环流越强。研究结果为北冰洋西部古环流和冰川的模拟提供了新的边界条件。MIS4之前的冰川间隔主要是北美特征,其含碳质或陆源性烃源岩。由Ca峰标记的碳质输入被追踪到加拿大西部北极群岛,这些岩石被Laurentide冰盖(LIS)侵蚀了。陆源(Zr峰值)可能与受到因纽特人冰盖和/或LIS Mackenzie冰流影响的地区有关。MIS 4和2间隔与西伯利亚/楚科奇州的构成不同,而不是北美出处。在冰川间隔内,颗粒大小表明风越强,表明中深层环流越强。研究结果为北冰洋西部古环流和冰川的模拟提供了新的边界条件。由Ca峰标记的碳质输入被追踪到加拿大西部北极群岛,这些岩石被Laurentide冰盖(LIS)侵蚀了。陆源(Zr峰值)可能与受到因纽特人冰盖和/或LIS Mackenzie冰流影响的地区有关。MIS 4和2间隔与西伯利亚/楚科奇州的构成不同,而不是北美出处。在冰川间隔内,颗粒大小表明风越强,表明中深层环流越强。研究结果为北冰洋西部古环流和冰川的模拟提供了新的边界条件。由Ca峰标记的碳质输入被追踪到加拿大西部北极群岛,这些岩石被Laurentide冰盖(LIS)侵蚀了。陆源(Zr峰值)可能与受到因纽特人冰盖和/或LIS Mackenzie冰流影响的地区有关。MIS 4和2间隔与西伯利亚/楚科奇州的构成不同,而不是北美出处。在冰川间隔中,颗粒大小表明风越强,表明中深层循环越强。研究结果为北冰洋西部古环流和冰川的模拟提供了新的边界条件。MIS 4和2间隔与西伯利亚/楚科奇州的构成不同,而非北美出身。在冰川间隔内,颗粒大小表明风越强,表明中深层环流越强。研究结果为北冰洋西部古环流和冰川的模拟提供了新的边界条件。MIS 4和2间隔与西伯利亚/楚科奇州的构成不同,而不是北美出处。在冰川间隔内,颗粒大小表明风越强,表明中深层环流越强。研究结果为北冰洋西部古环流和冰川的模拟提供了新的边界条件。

更新日期:2021-03-15
down
wechat
bug