Drilling to Gabbro in Intact Ocean Crust-猫眼课题宝

DOI：

10.1126/science.1126090

发表时间：

2006-05

期刊：

Science

影响因子：

56.9

通讯作者：

中科院分区：

综合性期刊1区

文献类型：

作者：

Douglas S. Wilson;D. Teagle;J. Alt;N. Banerjee;S. Umino;S. Miyashita;G. Acton;R. Anma;S. Barr;A. Belghoul;J. Carlut;D. Christie;R. Coggon;K. Cooper;C. Cordier;L. Crispini;S. R. Durand;F. Einaudi;L. Galli;Yongjun Gao;J. Geldmacher;L. Gilbert;N. Hayman;E. Herrero-Bervera;N. Hirano;S. Holter;S. Ingle;Shijun Jiang;U. Kalberkamp;M. Kerneklian;J. Koepke;C. Laverne;Haroldo L Lledo Vasquez;J. Maclennan;S. Morgan;N. Neo;H. Nichols;Sung-Hyun Park;M. Reichow;T. Sakuyama;T. Sano;R. Sandwell;B. Scheibner;C. Smith-Duque;S. Swift;P. Tartarotti;A. Tikku;M. Tominaga;E. Veloso;T. Yamasaki;S. Yamazaki;C. Ziegler

通过熔岩、岩脉和辉长岩对完整的洋壳序列进行取样，对于促进对洋中脊形成的地壳的形成和演变的理解是必要的，但几十年来，这一直是科学海洋钻探的一个难以捉摸的目标。最近在东太平洋钻探的1256D孔达到了地震层2内的辉长岩，1157米深的地壳以超快的扩张速度形成。辉长岩是在大洋中脊下形成的结晶熔融透镜体。辉长岩到达的深度证实了从现代洋中脊地震实验中推断出的预测：熔融透镜体以更快的扩展速度出现在较浅的深度。辉长岩侵入变质席状岩脉，其成分与上覆熔岩相似，排除了1256D孔迄今为止穿透的熔融透镜体形成的堆积下洋壳。

Sampling an intact sequence of oceanic crust through lavas, dikes, and gabbros is necessary to advance the understanding of the formation and evolution of crust formed at mid-ocean ridges, but it has been an elusive goal of scientific ocean drilling for decades. Recent drilling in the eastern Pacific Ocean in Hole 1256D reached gabbro within seismic layer 2, 1157 meters into crust formed at a superfast spreading rate. The gabbros are the crystallized melt lenses that formed beneath a mid-ocean ridge. The depth at which gabbro was reached confirms predictions extrapolated from seismic experiments at modern mid-ocean ridges: Melt lenses occur at shallower depths at faster spreading rates. The gabbros intrude metamorphosed sheeted dikes and have compositions similar to the overlying lavas, precluding formation of the cumulate lower oceanic crust from melt lenses so far penetrated by Hole 1256D.

Drilling to Gabbro in Intact Ocean Crust

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