[1]赵林涛,李三忠,索艳慧,等.延生微地块: 洋脊增生系统的复杂过程[J].大地构造与成矿学,2018,(优先出版):715-729.[doi:10.16539/j.ddgzyckx.2019.04.007]
 ZHAO Lintao,LI Sanzhong,SUO Yanhui,et al.Propagation-derived Micro-blocks: Complex Evolution of Mid-ocean Ridge Accretion System[J].Geotectonica et Metallogenia,2018,(优先出版):715-729.[doi:10.16539/j.ddgzyckx.2019.04.007]
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延生微地块: 洋脊增生系统的复杂过程
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《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2018年优先出版
页码:
715-729
栏目:
出版日期:
2019-12-30

文章信息/Info

Title:
Propagation-derived Micro-blocks: Complex Evolution of Mid-ocean Ridge Accretion System
作者:
赵林涛 李三忠 索艳慧 郭玲莉 王光增 戴黎明 朱俊江 刘 博 汪 刚
Author(s):
ZHAO Lintao LI Sanzhong SUO Yanhui GUO Lingli WANG GuangzengDAI Liming ZHU Junjiang LIU Bo and WANG Gang
关键词:
微地块 叠接性洋中脊 拓展 洋中脊 旋转
Keywords:
micro-block overlapping spreading ridge propagation mid-ocean ridge rotation
DOI:
10.16539/j.ddgzyckx.2019.04.007
文献标志码:
A
摘要:
随着探测技术的不断发展, 海洋中越来越多的微地块被识别出来, 在洋脊增生系统中心、由叠接性洋中脊拓展过程中形成的微小地块, 称之为延生微地块(propagation-derived micro-block)。根据其活动状态以及与洋中脊的相对位置, 又可划分为在轴型(on-axis)延生微地块和离轴型(off-axis)延生微地块。通过分析位于东太平洋海隆的复活节微地块、胡安?费尔南德斯微地块和纳兹卡板块内部的鲍尔微地块, 本文系统总结了延生微地块的识别标志、构造特征及成因模式。延生微地块见于两条洋中脊交汇处或洋中脊与转换断层、海底断裂带交汇处, 由捕获自周围大板块的“碎片”、以“碎片”为核心不断增生的洋底物质以及裂谷拓展过程中转移的岩石圈碎片组成。其边界类型有洋中脊或死亡洋中脊、转换断层、大洋汇聚边界、假断层等。延生微地块的成因与洋中脊叠接扩张、拓展延伸息息相关, 洋中脊的扩张速率决定了微地块的生长速率。因而扩张速率增大或持续扩张, 会促使微地块朝大板块演变; 扩张停止, 微地块脱离扩张轴, 成为离轴型延生微地块, 并逐渐融入周围大板块, 成为大板块的一部分。
Abstract:
With the development of exploration technology, more and more micro-blocks in the ocean have been identified. One of them formed at the mid-oceanic ridge and is generated by the propagation of overlapping spreading centers. In this paper, the micro-block is called “propagation-derived micro-block”. According to its activity and the relative position of mid-ocean ridge, it can be divided into two types: on-axis and off-axis. Based on the analysis of the Easter and Juan Fernandez oceanic micro-blocks formed in the Eastern Pacific Rise, and the Bauer micro-block within the Nazca Plate, the identification markers, tectonic characteristics and formation regimes of the propagation-derived micro-blocks are systematically summarized. It is surrounded by either several mid-oceanic ridges, mid-oceanic ridges, transform faults or deep faults. And it is composed of “lithospheric fragments” captured from the surrounding large-scale plates and oceanic accretion around the “fragments” as the core. Their boundaries include active or fossil mid-oceanic ridge, transform faults, fracture zones, oceanic convergent boundary, pseudo-faults and so on. It found that the propagation-derived micro-blocks are closely related to the propagating of the overlapping ridge, and the spreading rate of the ridge determines the growth rate of the micro-blocks. Therefore, under the increasing rate or continuous spreading, the micro-block will grow to be a large-scale plate. But when the spreading stops, the micro-block will break away from the spreading axis and become an off-axis micro-block, which will gradually merge into the surrounding large-scale plate and become a part of it.

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更新日期/Last Update: 2019-08-04