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Seismic Imaging of Dante's Domes Oceanic Core Complex From Streamer Waveform Inversion and Reverse Time Migration
Journal of Geophysical Research: Solid Earth ( IF 3.9 ) Pub Date : 2022-08-09 , DOI: 10.1029/2021jb023814
Maochuan Zhang 1, 2, 3 , Huizhe Di 1, 2, 4 , Min Xu 1, 2, 5 , Juan Pablo Canales 6 , Chuanhai Yu 1, 2, 5 , Xu Zhao 1, 2 , Peifeng Wang 1, 2, 4 , Xin Zeng 1, 2, 5 , Yue Wang 1, 2
Affiliation  

Early arrival traveltime tomography and full waveform inversion were conducted on downward continued streamer seismic data at Dante's Domes oceanic core complex (OCC), providing unprecedented details of shallow P wave velocity structure. Together with reverse time migration images, seafloor morphology, in situ geological samples, magnetic and gravity data, the seismic constraints are used to infer the lithological distribution along the seismic profiles. Based on the striking similarity in velocity structure beneath the corrugated domes with other OCCs and drilling results from Atlantis Massif, we confidently reconfirmed the Southern Dome as dominantly gabbroic rocks, and the Northern Dome as serpentinized peridotites. A series of isolated gabbroic bodies embedded in the diabase and basaltic layers is observed in the breakaway zone, suggesting that the initiation of Dante's Domes OCC occurred over a long period during which there were several failed attempts to form a long-lived detachment fault. This early development of the OCC probably occurred under a regime of alternating magma starvation and magma replenishment. The predominantly gabbroic section, beneath the Southern Dome and extending to termination, indicates the OCC has been created with relatively high magma flux. We also imaged distinct shallow subseafloor reflections which are also termed as D reflectors underneath the corrugated domes. The location of the D reflectors is similar to those in the Atlantis Massif, with depths well correlated with the top of exhumed gabbroic bodies and the discontinuities in the D reflectors between gabbroic bodies. Our findings contribute to the understanding of processes controlling the OCCs initiation and evolution at slow spreading ridges.

中文翻译:

流光波形反演和逆时偏移对但丁圆顶海洋核心复合体的地震成像

对 Dante 的 Domes 海洋核心复合体 (OCC) 的向下连续流带地震数据进行了早期到达走时层析成像和全波形反演,提供了前所未有的浅层P波速结构。结合逆时偏移图像、海底形态、原位地质样本、磁力和重力数据,地震约束被用来推断沿地震剖面的岩性分布。基于波纹圆顶下方的速度结构与其他 OCC 的惊人相似性以及亚特兰蒂斯地块的钻探结果,我们有信心地再次确认南圆顶主要为辉长岩,而北圆顶为蛇纹石化橄榄岩。在分离带中观察到一系列嵌入辉绿岩和玄武岩层中的孤立辉长岩体,表明但丁圆顶OCC的开始发生在很长一段时间内,在此期间有几次失败的尝试形成长寿命的拆离断层。OCC的这种早期发展可能发生在岩浆匮乏和岩浆补充交替的情况下。位于南穹顶下方并延伸至末端的以辉长岩为主的部分表明,OCC 是在相对较高的岩浆通量下形成的。我们还对不同的浅海底反射进行了成像,这些反射也被称为波纹圆顶下方的 D 反射器。D 反射层的位置与亚特兰蒂斯地块相似,深度与出土的辉长岩体顶部和 D 反射层中辉长岩体之间的不连续性有很好的相关性。我们的研究结果有助于理解控制 OCC 在缓慢扩张山脊处起始和演化的过程。在南穹顶下方并延伸至终止,表明 OCC 已形成具有相对较高的岩浆通量。我们还对不同的浅海底反射进行了成像,这些反射也被称为波纹圆顶下方的 D 反射器。D 反射层的位置与亚特兰蒂斯地块相似,深度与出土的辉长岩体顶部和 D 反射层中辉长岩体之间的不连续性有很好的相关性。我们的研究结果有助于理解控制 OCC 在缓慢扩张山脊处起始和演化的过程。在南穹顶下方并延伸至终止,表明 OCC 已形成具有相对较高的岩浆通量。我们还对不同的浅海底反射进行了成像,这些反射也被称为波纹圆顶下方的 D 反射器。D 反射层的位置与亚特兰蒂斯地块相似,深度与出土的辉长岩体顶部和 D 反射层中辉长岩体之间的不连续性有很好的相关性。我们的研究结果有助于理解控制 OCC 在缓慢扩张山脊处起始和演化的过程。D 反射层的位置与亚特兰蒂斯地块相似,深度与出土的辉长岩体顶部和 D 反射层中辉长岩体之间的不连续性有很好的相关性。我们的研究结果有助于理解控制 OCC 在缓慢扩张山脊处起始和演化的过程。D 反射层的位置与亚特兰蒂斯地块相似,深度与出土的辉长岩体顶部和 D 反射层中辉长岩体之间的不连续性有很好的相关性。我们的研究结果有助于理解控制 OCC 在缓慢扩张山脊处起始和演化的过程。
更新日期:2022-08-09
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