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1引言 Larson(1991a)认为,白垩纪期间的一期扩张速率的增大和玄武岩浆的产生是与一次约40百万年长的地磁场异常稳定的正极性幕相一致的。白垩纪太平洋岩浆活动高峰发生在120和80Ma之间,,当时凯尔盖朗和翁通-爪哇海台发生了喷发。长期性地幔活动性的计算机模拟表明,超地幔柱事件规模的幕式的大规模玄武岩浆作用增加了扩张速率,并且地磁场倒转的停止与大规模灾难性地幔倒流有关且受其驱动。本文提出,就中白垩世事件而言,地幔过程间接产生了大陆岩石的变形作用,然后发生在太平洋边缘。2中白垩世构造事件 中白垩世(早阿普特至晚阿尔布期:124～97Ma)的短生命脉动的证据,主要是阿尔布期的变形作用、变质作用、抬升和沉积作用间断而广泛分布于形成白垩纪太平洋边缘地域的前阿尔布期岩石内。对现代太平洋边缘反时针环视(图1)表明,岩石的分布保存着这些事件的记录。图2说明了这些事件按时间的紧密空间分布,并且它们与Larson。(1991a)确定的中白垩世太平洋洋底和海台的产生高峰相关。
1 INTRODUCTION Larson (1991a) argues that the first-stage expansion rate during the Cretaceous period and the basaltic magma production coincide with an anomalously stable positive polar curtain about 40 million years old. The Cretaceous Pacific Ocean magmatic activity peaked between 120 and 80 Ma, when eruptions took place in Kylegelang and Onton-Java seas. Computer simulations of long-term mantle activity show that large-scale basaltic magmatism of an episode of super-mantle plume increases the rate of expansion and the cessation of geomagnetic field reversal is related to and driven by large-scale catastrophic mantle backwashing. This paper proposes that the mantle process indirectly produced the deformation of continental rocks in the Middle Cretaceous event and then occurred at the margins of the Pacific Ocean. Evidence of short-lived pulsations in the Cretaceous Cretaceous (Early Apt to late Albupair: 124-97 Ma) during the Middle Cretaceous, mainly due to Albupane deformation, metamorphism, uplifting and sedimentation intermittent and extensive Distributed in the Cretaceous Pacific margin of the former Albuichan rock. Looking counter-clockwise to the edge of the modern Pacific (Figure 1) shows that the distribution of rocks preserves the record of these events. Figure 2 illustrates the close spatial distribution of these events over time, and they are related to Larson. (1991a), the mid-Cretaceous Pacific Ocean floor and the sea level are correlated.