什么导致了海平面下降在马斯特里赫特统时代?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 03 - 30 - t14:39:37z //www.hoelymoley.com/feeds/question/19178 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/19178 6 什么导致了海平面下降在马斯特里赫特统时代? JohnWDailey //www.hoelymoley.com/users/4985 2020 - 02 - 11 - t14:21:41z 2020 - 02年- 13 - t10:36:01z < p >研究冰河时代每个人都知道,在过去的两年半的几百万年的地球的历史,也会有一段时间有足够的冰吸收大量的水。因此,平均海平面下降了100米。最著名的例子这种下降是波尼吉亚,就是大陆,北美与亚洲相连。然而,< / p > < p >似乎并没有减少海平面的唯一途径。下图是北美多少改变了只有不到一千万年的时间。< / p > < p > < a href = " https://i.stack.imgur.com/Gi2UP.png " rel = " nofollow noreferrer " > < img src = " https://i.stack.imgur.com/Gi2UP.png " alt = "在这里输入图像描述" > < / > < / p > < p >左边是7500万年前北美的样子。右边是北美当时恐龙帝国九百万年之后下降。不仅仅是北美经验这个下降。事实上,整个世界正经历同样的过程(只是我找不到一个兼容足以post SE。) < / p > < p >大不了是与奥陶系不同,石炭纪、二叠纪和第四纪时期,这种海洋回归并不是因为冰,其程度(因此它的影响力)几乎最小的——<强> < em >高山< / em > < /强>在最好的。没有严重追尾极地冰一样的其他时期上市的最后一句话。< / p > < p > <强>如果冰不是海平面下降的原因在最新的白垩纪时代,那么还有什么可能导致同样的事情发生吗? < /强> < / p > //www.hoelymoley.com/questions/19178/-/19186 # 19186 6 user18590回答的什么导致了海平面下降在马斯特里赫特统时代? user18590 //www.hoelymoley.com/users/0 2020 - 02 - 12 - t10:19:42z 2020 - 02 - 12 - t13:46:06z < p >构造活动可以改变海洋盆地的体积,因此,修改海平面,冰无关。< / p > < p >首先让我们解释左边图片。< / p > < p >在白垩纪构造活动是高的。从地幔物质的通量海洋山脊和高原海洋盆地的体积,减少湿草地生产全球高海平面观测地球的不同地区。< / p > < p >在坎帕阶和Mastrichtian全球犯罪是公认的在几个地层地球的部分。< / p > < p > Z。Dubicka和d Peryt(2012)研究了地层序列在波兰湿草地还显示Mastrichtian海侵阶段。他们与其他相关地层的时代。< / p > < blockquote > < p >这海平面上升,记录在波兰东南部,可以与识别的海侵峰值汉考克(1993);这对应于Craise Graise (¼Vijlen成员)暴露在CPL采石场Halembaye在比利时,进而对应于低Belemnitella初级区,即,最早的马斯特里赫特统末。汉考克(1993)认为,全球可能出现这个峰值。他相关草原虚张声势的粉笔在墨西哥湾北部边缘与地层,略高于底部Tinton湿砂在大西洋海岸平原。最早的海侵峰末马斯特里赫特统寿匹拉也记录在部分在西班牙巴斯克弧域(Gomez-Alday et al ., 2004),恰逢inoceramid灭绝,较低的非正式定义/马斯特里赫特统上部边界。 Moreover, a marked transgression in the middle Maastrichtian was reported from the Southern Hemisphere by Huber and Watkins (1992) who noted a higher diversity of keeled foraminifera, which they interpreted as reflecting a possible transgression.

Then let's focus in your question about the sea level drop. It is pretty obvious a regression happened, at least at North America.

The sea level drop appears to be global too, according to Matsumoto (2002) and associated to a slowing down of global tectonic activity.

Tectono-eustasy may have been the main cause of the phenomena of transgression-regression, but certain kinds of other tectonic movements which affected even the so-called stable platforms were also responsible for the phenomena. The combined effects of various causes may have been unusual in the Cretaceous, since it was a period of global tectonic activity. The slowing down of this activity followed by readjustments may have been the cause of the global regression at the end of the Cretaceous.

Zofia Dubicka, Danuta Peryt (2012): "Latest Campanian and Maastrichtian palaeoenvironmental changes: Implications from an epicontinental sea (SE Poland and western Ukraine)", Cretaceous Research Volume 37, October 2012, Pages 272-284. https://doi.org/10.1016/j.cretres.2012.04.009

T.Matsumoto (2002): "Inter-regional correlation of transgressions and regressions in the Cretaceous period", Palaeogeography, Palaeoclimatology, Palaeoecology. Volume 187, Issues 1–2, 1 November 2002, Pages 35-60 https://doi.org/10.1016/S0031-0182(02)00504-7
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