安第斯前陆盆地南部Campanian始新世甲藻囊生物地层学:德雷克通道通流的意义

IF 0.9 4区 地球科学 Q3 GEOLOGY
P. Bijl, G. R. Guerstein, Edgar A. Sanmiguel Jaimes, A. Sluijs, S. Casadío, V. Valencia, C. Amenábar, A. Encinas
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引用次数: 9

摘要

塔斯马尼亚海峡和德雷克海峡的构造开口是南极环极流(ACC)新生代发展的重要地理条件。特别是德雷克通道的构造复杂性,阻碍了裂谷期和裂谷期的准确测年,也阻碍了裂谷期贯穿流的发生。其中一个障碍是将南部巴塔哥尼亚沉积物中记录的关键区域构造事件置于绝对时间。为此,我们从南巴塔哥尼亚的智利地区收集了坎帕尼亚-始新世沉积物样本。利用锆石和鞭毛藻囊生物地层的U-Pb测年技术,更新了沉积地层的年龄约束,以及两者之间的间隙。在早坎帕纪、中古新世、古新世-始新世交界段和中始新世,前陆盆地沉积了较厚的浅海沉积和陆相沉积包体,代表了前陆沉降加剧的阶段。我们解释了横跨晚坎帕世、早至中古新世、中始新世和晚始新世-早渐新世的区域沉积断裂,以表明相对于沉积物供应,前陆沉降减少的时间。我们将这些变化与不同的俯冲速率和安第斯造山运动联系起来。鞭毛藻囊组合表明,该地区在西南大西洋发育的亚极地环流的西边界流中受到来自南极的水的影响,因此至少在始新世晚期之前,通过德雷克海峡的通流是有限的。然而,我们在西南大西洋记录到的鞭毛藻特有的增殖与西南太平洋是同步的,在物种水平上,这两个地区的鞭毛藻囊组合是相同的。这表明这两个地区在古近纪早期在海洋学上是相连的,很可能是通过一个狭窄的德雷克通道的浅口。这意味着在整个晚白垩世-早古近纪,南太平洋和南大西洋之间有一个连续的地表水连接。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Campanian-Eocene dinoflagellate cyst biostratigraphy in the Southern Andean foreland basin: Implications for Drake Passage throughflow
The tectonic opening of the Tasmanian Gateway and Drake Passage represented crucial geographic requirements for the Cenozoic development of the Antarctic Circumpolar Current (ACC). Particularly the tectonic complexity of Drake Passage has hampered the exact dating of the opening and deepening phases, and the consequential onset of throughflow of the ACC. One of the obstacles is putting key regional tectonic events, recorded in southern Patagonian sediments, in absolute time. For that purpose, we have collected Campanian-Eocene sediment samples from the Chilean sector of Southern Patagonia. Using U-Pb radiometric dating on zircons and dinoflagellate cyst biostratigraphy, we updated age constraints for the sedimentary formations, and the hiatuses in between. Thick sedimentary packages of shallow-marine and continental sediments were deposited in the foreland basin during the early Campanian, mid-Paleocene, the Paleocene-Eocene boundary interval and the middle Eocene, which represent phases of increased foreland subsidence. We interpret regional sedimentary hiatuses spanning the late Campanian, early-to mid-Paleocene, mid-Eocene and latest Eocene-early Oligocene to indicate times of reduced foreland subsidence, relative to sediment supply. We relate these changes to varying subduction rates and Andean orogeny. Dinoflagellate cyst assemblages suggest that the region was under the influence of the Antarctic-derived waters through the western boundary current of the Subpolar Gyre, developed in the southwest Atlantic Ocean and thus argues for limited throughflow through the Drake Passage until at least the latest Eocene. However, the proliferation of dinoflagellate endemism we record in the southwest Atlantic is coeval with that in the southwest Pacific, and on a species level, dinoflagellate cyst assemblages are the same in these two regions. This suggests that both regions were oceanographically connected throughout the early Paleogene, likely through a shallow opening of a restricted Drake Passage. This implies a continuous surface-water connection between the south Pacific and the South Atlantic throughout the late Cretaceous-early Paleogene.
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来源期刊
Andean Geology
Andean Geology 地学-地质学
CiteScore
3.90
自引率
0.00%
发文量
17
审稿时长
>12 weeks
期刊介绍: This journal publishes original and review articles on geology and related sciences, in Spanish or English, in three issues a year (January, May and September). Articles or notes on major topics of broad interest in Earth Sciences dealing with the geology of South and Central America and Antarctica, and particularly of the Andes, are welcomed. The journal is interested in publishing thematic sets of papers and accepts articles dealing with systematic Paleontology only if their main focus is the chronostratigraphical, paleoecological and/or paleogeographical importance of the taxa described therein.
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