Paleodepth distribution of Neocene deep‐sea hiatuses
Paleodepth distribution of Neocene deep‐sea hiatuses
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DOI：
10.1029/pa002i006p00697
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发表时间：
1987-12
期刊：
影响因子：
--
通讯作者：
G. Keller;J. Barron
中科院分区：
文献类型：
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作者：
G. Keller;J. Barron
利用大西洋、太平洋和印度洋的152个深海钻探项目点，确定了中新世至上新世中期深海间断（NH 1至NH 8）的形成深度。代表深海侵蚀最大值的巨海蚀孔出现在三个水深处：3800米以下，约2000至3000米之间的中间深度，以及1500米古深度以上的较浅沃茨。这些裂孔最大值的paleodepth和分布表明，南极底层水，南极中层水和北大西洋深水质量流在很大程度上造成了这种侵蚀。与氧同位素，碳酸盐和海平面记录的间断的相关性表明，在11 Ma之前，短暂的间断，包括那些在高生产力的赤道地区的非沉积在很大程度上与全球变冷事件，高碳酸盐含量，和海平面的低位。在过去的1100万年里，间断似乎也与冷却事件有关，但碳酸盐溶解是其特征，海平面可能一直在上升或处于低位。在NH 4、NH 7和NH 8期间，海平面上升可能与极地变冷相对应，但相关性存在不确定性。海平面上升期间的短暂间断可以用碳酸盐的盆棚分馏来解释。海平面低水位和冷却期的间断可能是由于上升流增加期间二氧化碳含量增加和生产力增加导致底层水循环加剧和底层水腐蚀性增加。补充（附录1）是可利用与整个文章的缩微胶片。订单来自美国地球物理联合会，2000佛罗里达大道，西北，华盛顿，20009。文件P87001; 2.50美元。付款必须随订单一起支付。
The depth of formation of Miocene to middle Pliocene deep-sea hiatuses (NH1 to NH8)has been determined using 152 Deep Sea Drilling Project sites in the Atlantic, Pacific and Indian oceans. Megahiatuses representing maxima in deep-sea erosion, occur at three water depths: below 3800 m, at intermediate depths between about 2000 and 3000 m, and in shallower waters above 1500 m paleodepth. Both the paleodepths and distribution of these hiatus maxima suggest that flow of Antarctic Bottom Water, Antarctic Intermediate Water, and North Atlantic Deep Water masses largely caused this erosion. Correlation of the hiatuses with oxygen isotope, carbonate and sea level records indicates that prior to 11 Ma, brief hiatuses including those resulting from nondeposition in high-productivity equatorial regions largely correlate with global cooling episodes, high-carbonate content, and lowstands of sea level. During the last 11 m.y., hiatuses also seem to correlate with cooling episodes, but carbonate dissolution is characteristic and sea levels may have been rising or at a lowstand. During the NH4, NH7, and NH8 intervals, it is possible that a rise in sea level corresponds with polar cooling, but there is uncertainty in correlation. Brief hiatuses during rising sea levels can be explained by basin-shelf fractionation of carbonates. Hiatuses during sea level lowstands and cooling episodes may result from intensified bottom water circulation and increased corrosiveness of bottom water due to higher levels of CO2 and increased productivity during increased upwelling. Supplement (Appendix 1) is availablewith entire article on microfiche. Orderfrom American Geophysical Union, 2000Florida Avenue, N.W., Washington, DC20009. Document P87001; $2.50. Paymentmust accompany order.