Waxing (and Waning) lyrical on hiatuses: Eocene - Quaternary Indian Ocean hiatuses as proxy indicators of water mass production
Waxing (and Waning) lyrical on hiatuses: Eocene - Quaternary Indian Ocean hiatuses as proxy indicators of water mass production
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DOI：
10.1029/94pa01397
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发表时间：
1994-12
期刊：
影响因子：
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通讯作者：
A. Ramsay;T. J. Sykes;R. Kidd
中科院分区：
文献类型：
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作者：
A. Ramsay;T. J. Sykes;R. Kidd
根据古海洋学印度洋综合研究所提出的新的时间框架，重新考虑了印度洋新生代间断的时间分布。根据时间分布的中断终端，8个3百万年。选择时间片绘制裂孔终止的古地理分布。这些分布确定了可能的间断发展区域，这些区域是沿着原南极底层水（现代南极底层水的类似物）和原南极中层水（现代南极中层水的类似物）的流动路径沿着形成的。这些区域的扩张和收缩表明这些水团的体积发生了变化，从而改变了侵蚀性深水流和腐蚀性底层水的分布模式。因此，空间和水深分布的裂孔形成改变。从后晚始新世地区的潜在的间断发展的网站的间断深度分析，结合波动的水团内的不整合边界的行为模型，构建的增/减曲线为原南极底层水和原南极中层水。这些曲线定义了这些水团的生产历史中的体积变化，这些水团与南极洲始新世晚期后的冰川历史有关。自渐新世晚期以来，原南极底层水在冰川强度增加的时间间隔内减弱，而原南极中层水在这些时间间隔内变大。这些关系在冰川强度减弱的时期发生了逆转，包括没有证据表明南极冰川作用的时期。这与其他工人的解释相冲突。本文对中新世至上新世原始舌状底层水和类似于北大西洋深层水的北方组分水的产出历史进行了对比。
The temporal distributions of Cenozoic hiatuses in the Indian Ocean are reconsidered in the light of a new time framework developed by the Paleoceanographic Indian Ocean Synthesis. On the basis of the temporal distribution of hiatus terminations, eight 3 m.y. time slices were selected for plotting the paleogeographical distribution of hiatus terminations. These distributions define areas of potential hiatus development, which formed along flow paths of proto-Antarctic Bottom Water (an analogue of modern Antarctic Bottom Water) and proto-Antarctic Intermediate Water (an analogue of modern Antarctic Intermediate Water). Expansion and contraction of these areas suggested changes in the volume of these water masses, which modified the distibution patterns of erosive deepwater currents and corrosive bottom water. Consequently, the spatial and bathymetric distribution of hiatus formation was altered. Age-depth analysis of hiatuses from sites within post-late Eocene areas of potential hiatus development was used, in conjunction with models of the behavior of unconformity boundaries within fluctuating water masses, to construct waxing/waning curves for proto-Antarctic Bottom Water and proto-Antarctic Intermediate Water. These curves define volume changes in the production histories of these water masses which were related to the post-late Eocene glacial history of Antarctica. Since the late Oligocene, the proto-Antarctic Bottom Water waned during intervals of increased glacial intensity, whereas the proto-Antarctic Intermediate Water waxed during these intervals. These relationships reversed during intervals of reduced glacial intensity, including intervals where there is no evidence for Antarctic glaciation. This conflicts with interpretations made by other workers. A comparison is made between the production histories of proto-Antarctric Bottom Water and Northern Component Water (an analogue of North Atlantic Deep Water) based on ∂13C for the Miocene to Pliocene.