Dyke Swarms time markers of crustal evolution
Dyke Swarms time markers of crustal evolution
复制标题
堤坝群地壳演化的时间标记
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
T. Rämö
中科院分区：
文献类型：
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作者：
E. Hanski;S. Mertanen;T. Rämö
大陆在时间和空间上保存了丰富的短寿命镁铁质岩浆事件记录。现在，这些事件中的许多都可以定期和精确地确定日期。这些事件与裂谷作用和大陆裂解在空间和时间上的联系，导致残余物保存在原来相邻的（共轭）边缘及其各自的大陆边缘。因此，原本相邻但现在相距遥远的地壳碎片可能共享一个（如果不是几个）短暂岩浆事件的残余。在大陆地壳的某一特定片段中，短暂岩浆事件的总体记录实质上定义了一个高分辨率的“条形码”，它表征了该地壳的起源。这些“条形码”的时间匹配，以及“精确穿刺点”的空间和几何匹配，为重建古大陆提供了最通用、最有效和最可靠的方法。为了说明一般的方法，我们提出了最详细的凯恩斯克拉通相关性尚未提出，之间的上级，赫恩，卡累利阿和怀俄明州。
Continents preserve a rich record of short-lived mafic magmatic events through time and space. Many of these events can now be dated, routinely and precisely. The spatial and temporal association of such events with rifting and continental break-up leads to remnants being preserved on originally adjacent (conjugate) margins and their respective hinterlands. Originally adjacent but now distant pieces of crust thus likely share remnants of one, if not several, shortlived magmatic events. The overall record of short-lived magmatic events in a particular fragment of continental crust defines, in essence, a high-resolution “barcode” that characterizes the ancestry of that piece of crust. Temporal matching of these “barcodes”, together with spatial and geometrical matching of “precise piercing points”, provides the most general, most efficient, and most robust method for reconstructing ancient continents. To illustrate the general methodology, we present the most detailed Archaean craton correlation yet proposed, between Superior, Hearne, Karelia and Wyoming.